(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.mqtt = f()}})(function(){var define,module,exports;return (function(){function r(e,n,t){function o(i,f){if(!n[i]){if(!e[i]){var c="function"==typeof require&&require;if(!f&&c)return c(i,!0);if(u)return u(i,!0);var a=new Error("Cannot find module '"+i+"'");throw a.code="MODULE_NOT_FOUND",a}var p=n[i]={exports:{}};e[i][0].call(p.exports,function(r){var n=e[i][1][r];return o(n||r)},p,p.exports,r,e,n,t)}return n[i].exports}for(var u="function"==typeof require&&require,i=0;i<t.length;i++)o(t[i]);return o}return r})()({1:[function(require,module,exports){
(function (process,global){(function (){
'use strict'

/**
 * Module dependencies
 */
const EventEmitter = require('events').EventEmitter
const Store = require('./store')
const TopicAliasRecv = require('./topic-alias-recv')
const TopicAliasSend = require('./topic-alias-send')
const mqttPacket = require('mqtt-packet')
const DefaultMessageIdProvider = require('./default-message-id-provider')
const Writable = require('readable-stream').Writable
const inherits = require('inherits')
const reInterval = require('reinterval')
const clone = require('rfdc/default')
const validations = require('./validations')
const xtend = require('xtend')
const debug = require('debug')('mqttjs:client')
const nextTick = process ? process.nextTick : function (callback) { setTimeout(callback, 0) }
const setImmediate = global.setImmediate || function (callback) {
  // works in node v0.8
  nextTick(callback)
}
const defaultConnectOptions = {
  keepalive: 60,
  reschedulePings: true,
  protocolId: 'MQTT',
  protocolVersion: 4,
  reconnectPeriod: 1000,
  connectTimeout: 30 * 1000,
  clean: true,
  resubscribe: true
}

const socketErrors = [
  'ECONNREFUSED',
  'EADDRINUSE',
  'ECONNRESET',
  'ENOTFOUND'
]

// Other Socket Errors: EADDRINUSE, ECONNRESET, ENOTFOUND.

const errors = {
  0: '',
  1: 'Unacceptable protocol version',
  2: 'Identifier rejected',
  3: 'Server unavailable',
  4: 'Bad username or password',
  5: 'Not authorized',
  16: 'No matching subscribers',
  17: 'No subscription existed',
  128: 'Unspecified error',
  129: 'Malformed Packet',
  130: 'Protocol Error',
  131: 'Implementation specific error',
  132: 'Unsupported Protocol Version',
  133: 'Client Identifier not valid',
  134: 'Bad User Name or Password',
  135: 'Not authorized',
  136: 'Server unavailable',
  137: 'Server busy',
  138: 'Banned',
  139: 'Server shutting down',
  140: 'Bad authentication method',
  141: 'Keep Alive timeout',
  142: 'Session taken over',
  143: 'Topic Filter invalid',
  144: 'Topic Name invalid',
  145: 'Packet identifier in use',
  146: 'Packet Identifier not found',
  147: 'Receive Maximum exceeded',
  148: 'Topic Alias invalid',
  149: 'Packet too large',
  150: 'Message rate too high',
  151: 'Quota exceeded',
  152: 'Administrative action',
  153: 'Payload format invalid',
  154: 'Retain not supported',
  155: 'QoS not supported',
  156: 'Use another server',
  157: 'Server moved',
  158: 'Shared Subscriptions not supported',
  159: 'Connection rate exceeded',
  160: 'Maximum connect time',
  161: 'Subscription Identifiers not supported',
  162: 'Wildcard Subscriptions not supported'
}

function defaultId () {
  return 'mqttjs_' + Math.random().toString(16).substr(2, 8)
}

function applyTopicAlias (client, packet) {
  if (client.options.protocolVersion === 5) {
    if (packet.cmd === 'publish') {
      let alias
      if (packet.properties) {
        alias = packet.properties.topicAlias
      }
      const topic = packet.topic.toString()
      if (client.topicAliasSend) {
        if (alias) {
          if (topic.length !== 0) {
            // register topic alias
            debug('applyTopicAlias :: register topic: %s - alias: %d', topic, alias)
            if (!client.topicAliasSend.put(topic, alias)) {
              debug('applyTopicAlias :: error out of range. topic: %s - alias: %d', topic, alias)
              return new Error('Sending Topic Alias out of range')
            }
          }
        } else {
          if (topic.length !== 0) {
            if (client.options.autoAssignTopicAlias) {
              alias = client.topicAliasSend.getAliasByTopic(topic)
              if (alias) {
                packet.topic = ''
                packet.properties = { ...(packet.properties), topicAlias: alias }
                debug('applyTopicAlias :: auto assign(use) topic: %s - alias: %d', topic, alias)
              } else {
                alias = client.topicAliasSend.getLruAlias()
                client.topicAliasSend.put(topic, alias)
                packet.properties = { ...(packet.properties), topicAlias: alias }
                debug('applyTopicAlias :: auto assign topic: %s - alias: %d', topic, alias)
              }
            } else if (client.options.autoUseTopicAlias) {
              alias = client.topicAliasSend.getAliasByTopic(topic)
              if (alias) {
                packet.topic = ''
                packet.properties = { ...(packet.properties), topicAlias: alias }
                debug('applyTopicAlias :: auto use topic: %s - alias: %d', topic, alias)
              }
            }
          }
        }
      } else if (alias) {
        debug('applyTopicAlias :: error out of range. topic: %s - alias: %d', topic, alias)
        return new Error('Sending Topic Alias out of range')
      }
    }
  }
}

function removeTopicAliasAndRecoverTopicName (client, packet) {
  let alias
  if (packet.properties) {
    alias = packet.properties.topicAlias
  }

  let topic = packet.topic.toString()
  if (topic.length === 0) {
    // restore topic from alias
    if (typeof alias === 'undefined') {
      return new Error('Unregistered Topic Alias')
    } else {
      topic = client.topicAliasSend.getTopicByAlias(alias)
      if (typeof topic === 'undefined') {
        return new Error('Unregistered Topic Alias')
      } else {
        packet.topic = topic
      }
    }
  }
  if (alias) {
    delete packet.properties.topicAlias
  }
}

function sendPacket (client, packet, cb) {
  debug('sendPacket :: packet: %O', packet)
  debug('sendPacket :: emitting `packetsend`')

  client.emit('packetsend', packet)

  debug('sendPacket :: writing to stream')
  const result = mqttPacket.writeToStream(packet, client.stream, client.options)
  debug('sendPacket :: writeToStream result %s', result)
  if (!result && cb && cb !== nop) {
    debug('sendPacket :: handle events on `drain` once through callback.')
    client.stream.once('drain', cb)
  } else if (cb) {
    debug('sendPacket :: invoking cb')
    cb()
  }
}

function flush (queue) {
  if (queue) {
    debug('flush: queue exists? %b', !!(queue))
    Object.keys(queue).forEach(function (messageId) {
      if (typeof queue[messageId].cb === 'function') {
        queue[messageId].cb(new Error('Connection closed'))
        // This is suspicious.  Why do we only delete this if we have a callbck?
        // If this is by-design, then adding no as callback would cause this to get deleted unintentionally.
        delete queue[messageId]
      }
    })
  }
}

function flushVolatile (queue) {
  if (queue) {
    debug('flushVolatile :: deleting volatile messages from the queue and setting their callbacks as error function')
    Object.keys(queue).forEach(function (messageId) {
      if (queue[messageId].volatile && typeof queue[messageId].cb === 'function') {
        queue[messageId].cb(new Error('Connection closed'))
        delete queue[messageId]
      }
    })
  }
}

function storeAndSend (client, packet, cb, cbStorePut) {
  debug('storeAndSend :: store packet with cmd %s to outgoingStore', packet.cmd)
  let storePacket = packet
  let err
  if (storePacket.cmd === 'publish') {
    // The original packet is for sending.
    // The cloned storePacket is for storing to resend on reconnect.
    // Topic Alias must not be used after disconnected.
    storePacket = clone(packet)
    err = removeTopicAliasAndRecoverTopicName(client, storePacket)
    if (err) {
      return cb && cb(err)
    }
  }
  client.outgoingStore.put(storePacket, function storedPacket (err) {
    if (err) {
      return cb && cb(err)
    }
    cbStorePut()
    sendPacket(client, packet, cb)
  })
}

function nop (error) {
  debug('nop ::', error)
}

/**
 * MqttClient constructor
 *
 * @param {Stream} stream - stream
 * @param {Object} [options] - connection options
 * (see Connection#connect)
 */
function MqttClient (streamBuilder, options) {
  let k
  const that = this

  if (!(this instanceof MqttClient)) {
    return new MqttClient(streamBuilder, options)
  }

  this.options = options || {}

  // Defaults
  for (k in defaultConnectOptions) {
    if (typeof this.options[k] === 'undefined') {
      this.options[k] = defaultConnectOptions[k]
    } else {
      this.options[k] = options[k]
    }
  }

  debug('MqttClient :: options.protocol', options.protocol)
  debug('MqttClient :: options.protocolVersion', options.protocolVersion)
  debug('MqttClient :: options.username', options.username)
  debug('MqttClient :: options.keepalive', options.keepalive)
  debug('MqttClient :: options.reconnectPeriod', options.reconnectPeriod)
  debug('MqttClient :: options.rejectUnauthorized', options.rejectUnauthorized)
  debug('MqttClient :: options.topicAliasMaximum', options.topicAliasMaximum)

  this.options.clientId = (typeof options.clientId === 'string') ? options.clientId : defaultId()

  debug('MqttClient :: clientId', this.options.clientId)

  this.options.customHandleAcks = (options.protocolVersion === 5 && options.customHandleAcks) ? options.customHandleAcks : function () { arguments[3](0) }

  this.streamBuilder = streamBuilder

  this.messageIdProvider = (typeof this.options.messageIdProvider === 'undefined') ? new DefaultMessageIdProvider() : this.options.messageIdProvider

  // Inflight message storages
  this.outgoingStore = options.outgoingStore || new Store()
  this.incomingStore = options.incomingStore || new Store()

  // Should QoS zero messages be queued when the connection is broken?
  this.queueQoSZero = options.queueQoSZero === undefined ? true : options.queueQoSZero

  // map of subscribed topics to support reconnection
  this._resubscribeTopics = {}

  // map of a subscribe messageId and a topic
  this.messageIdToTopic = {}

  // Ping timer, setup in _setupPingTimer
  this.pingTimer = null
  // Is the client connected?
  this.connected = false
  // Are we disconnecting?
  this.disconnecting = false
  // Packet queue
  this.queue = []
  // connack timer
  this.connackTimer = null
  // Reconnect timer
  this.reconnectTimer = null
  // Is processing store?
  this._storeProcessing = false
  // Packet Ids are put into the store during store processing
  this._packetIdsDuringStoreProcessing = {}
  // Store processing queue
  this._storeProcessingQueue = []

  // Inflight callbacks
  this.outgoing = {}

  // True if connection is first time.
  this._firstConnection = true

  if (options.topicAliasMaximum > 0) {
    if (options.topicAliasMaximum > 0xffff) {
      debug('MqttClient :: options.topicAliasMaximum is out of range')
    } else {
      this.topicAliasRecv = new TopicAliasRecv(options.topicAliasMaximum)
    }
  }

  // Send queued packets
  this.on('connect', function () {
    const queue = this.queue

    function deliver () {
      const entry = queue.shift()
      debug('deliver :: entry %o', entry)
      let packet = null

      if (!entry) {
        that._resubscribe()
        return
      }

      packet = entry.packet
      debug('deliver :: call _sendPacket for %o', packet)
      let send = true
      if (packet.messageId && packet.messageId !== 0) {
        if (!that.messageIdProvider.register(packet.messageId)) {
          send = false
        }
      }
      if (send) {
        that._sendPacket(
          packet,
          function (err) {
            if (entry.cb) {
              entry.cb(err)
            }
            deliver()
          }
        )
      } else {
        debug('messageId: %d has already used. The message is skipped and removed.', packet.messageId)
        deliver()
      }
    }

    debug('connect :: sending queued packets')
    deliver()
  })

  this.on('close', function () {
    debug('close :: connected set to `false`')
    this.connected = false

    debug('close :: clearing connackTimer')
    clearTimeout(this.connackTimer)

    debug('close :: clearing ping timer')
    if (that.pingTimer !== null) {
      that.pingTimer.clear()
      that.pingTimer = null
    }

    if (this.topicAliasRecv) {
      this.topicAliasRecv.clear()
    }

    debug('close :: calling _setupReconnect')
    this._setupReconnect()
  })
  EventEmitter.call(this)

  debug('MqttClient :: setting up stream')
  this._setupStream()
}
inherits(MqttClient, EventEmitter)

/**
 * setup the event handlers in the inner stream.
 *
 * @api private
 */
MqttClient.prototype._setupStream = function () {
  const that = this
  const writable = new Writable()
  const parser = mqttPacket.parser(this.options)
  let completeParse = null
  const packets = []

  debug('_setupStream :: calling method to clear reconnect')
  this._clearReconnect()

  debug('_setupStream :: using streamBuilder provided to client to create stream')
  this.stream = this.streamBuilder(this)

  parser.on('packet', function (packet) {
    debug('parser :: on packet push to packets array.')
    packets.push(packet)
  })

  function nextTickWork () {
    if (packets.length) {
      nextTick(work)
    } else {
      const done = completeParse
      completeParse = null
      done()
    }
  }

  function work () {
    debug('work :: getting next packet in queue')
    const packet = packets.shift()

    if (packet) {
      debug('work :: packet pulled from queue')
      that._handlePacket(packet, nextTickWork)
    } else {
      debug('work :: no packets in queue')
      const done = completeParse
      completeParse = null
      debug('work :: done flag is %s', !!(done))
      if (done) done()
    }
  }

  writable._write = function (buf, enc, done) {
    completeParse = done
    debug('writable stream :: parsing buffer')
    parser.parse(buf)
    work()
  }

  function streamErrorHandler (error) {
    debug('streamErrorHandler :: error', error.message)
    if (socketErrors.includes(error.code)) {
      // handle error
      debug('streamErrorHandler :: emitting error')
      that.emit('error', error)
    } else {
      nop(error)
    }
  }

  debug('_setupStream :: pipe stream to writable stream')
  this.stream.pipe(writable)

  // Suppress connection errors
  this.stream.on('error', streamErrorHandler)

  // Echo stream close
  this.stream.on('close', function () {
    debug('(%s)stream :: on close', that.options.clientId)
    flushVolatile(that.outgoing)
    debug('stream: emit close to MqttClient')
    that.emit('close')
  })

  // Send a connect packet
  debug('_setupStream: sending packet `connect`')
  const connectPacket = Object.create(this.options)
  connectPacket.cmd = 'connect'
  if (this.topicAliasRecv) {
    if (!connectPacket.properties) {
      connectPacket.properties = {}
    }
    if (this.topicAliasRecv) {
      connectPacket.properties.topicAliasMaximum = this.topicAliasRecv.max
    }
  }
  // avoid message queue
  sendPacket(this, connectPacket)

  // Echo connection errors
  parser.on('error', this.emit.bind(this, 'error'))

  // auth
  if (this.options.properties) {
    if (!this.options.properties.authenticationMethod && this.options.properties.authenticationData) {
      that.end(() =>
        this.emit('error', new Error('Packet has no Authentication Method')
        ))
      return this
    }
    if (this.options.properties.authenticationMethod && this.options.authPacket && typeof this.options.authPacket === 'object') {
      const authPacket = xtend({ cmd: 'auth', reasonCode: 0 }, this.options.authPacket)
      sendPacket(this, authPacket)
    }
  }

  // many drain listeners are needed for qos 1 callbacks if the connection is intermittent
  this.stream.setMaxListeners(1000)

  clearTimeout(this.connackTimer)
  this.connackTimer = setTimeout(function () {
    debug('!!connectTimeout hit!! Calling _cleanUp with force `true`')
    that._cleanUp(true)
  }, this.options.connectTimeout)
}

MqttClient.prototype._handlePacket = function (packet, done) {
  const options = this.options

  if (options.protocolVersion === 5 && options.properties && options.properties.maximumPacketSize && options.properties.maximumPacketSize < packet.length) {
    this.emit('error', new Error('exceeding packets size ' + packet.cmd))
    this.end({ reasonCode: 149, properties: { reasonString: 'Maximum packet size was exceeded' } })
    return this
  }
  debug('_handlePacket :: emitting packetreceive')
  this.emit('packetreceive', packet)

  switch (packet.cmd) {
    case 'publish':
      this._handlePublish(packet, done)
      break
    case 'puback':
    case 'pubrec':
    case 'pubcomp':
    case 'suback':
    case 'unsuback':
      this._handleAck(packet)
      done()
      break
    case 'pubrel':
      this._handlePubrel(packet, done)
      break
    case 'connack':
      this._handleConnack(packet)
      done()
      break
    case 'auth':
      this._handleAuth(packet)
      done()
      break
    case 'pingresp':
      this._handlePingresp(packet)
      done()
      break
    case 'disconnect':
      this._handleDisconnect(packet)
      done()
      break
    default:
      // do nothing
      // maybe we should do an error handling
      // or just log it
      break
  }
}

MqttClient.prototype._checkDisconnecting = function (callback) {
  if (this.disconnecting) {
    if (callback && callback !== nop) {
      callback(new Error('client disconnecting'))
    } else {
      this.emit('error', new Error('client disconnecting'))
    }
  }
  return this.disconnecting
}

/**
 * publish - publish <message> to <topic>
 *
 * @param {String} topic - topic to publish to
 * @param {String, Buffer} message - message to publish
 * @param {Object} [opts] - publish options, includes:
 *    {Number} qos - qos level to publish on
 *    {Boolean} retain - whether or not to retain the message
 *    {Boolean} dup - whether or not mark a message as duplicate
 *    {Function} cbStorePut - function(){} called when message is put into `outgoingStore`
 * @param {Function} [callback] - function(err){}
 *    called when publish succeeds or fails
 * @returns {MqttClient} this - for chaining
 * @api public
 *
 * @example client.publish('topic', 'message');
 * @example
 *     client.publish('topic', 'message', {qos: 1, retain: true, dup: true});
 * @example client.publish('topic', 'message', console.log);
 */
MqttClient.prototype.publish = function (topic, message, opts, callback) {
  debug('publish :: message `%s` to topic `%s`', message, topic)
  const options = this.options

  // .publish(topic, payload, cb);
  if (typeof opts === 'function') {
    callback = opts
    opts = null
  }

  // default opts
  const defaultOpts = { qos: 0, retain: false, dup: false }
  opts = xtend(defaultOpts, opts)

  if (this._checkDisconnecting(callback)) {
    return this
  }

  const that = this
  const publishProc = function () {
    let messageId = 0
    if (opts.qos === 1 || opts.qos === 2) {
      messageId = that._nextId()
      if (messageId === null) {
        debug('No messageId left')
        return false
      }
    }
    const packet = {
      cmd: 'publish',
      topic: topic,
      payload: message,
      qos: opts.qos,
      retain: opts.retain,
      messageId: messageId,
      dup: opts.dup
    }

    if (options.protocolVersion === 5) {
      packet.properties = opts.properties
    }

    debug('publish :: qos', opts.qos)
    switch (opts.qos) {
      case 1:
      case 2:
        // Add to callbacks
        that.outgoing[packet.messageId] = {
          volatile: false,
          cb: callback || nop
        }
        debug('MqttClient:publish: packet cmd: %s', packet.cmd)
        that._sendPacket(packet, undefined, opts.cbStorePut)
        break
      default:
        debug('MqttClient:publish: packet cmd: %s', packet.cmd)
        that._sendPacket(packet, callback, opts.cbStorePut)
        break
    }
    return true
  }

  if (this._storeProcessing || this._storeProcessingQueue.length > 0 || !publishProc()) {
    this._storeProcessingQueue.push(
      {
        invoke: publishProc,
        cbStorePut: opts.cbStorePut,
        callback: callback
      }
    )
  }
  return this
}

/**
 * subscribe - subscribe to <topic>
 *
 * @param {String, Array, Object} topic - topic(s) to subscribe to, supports objects in the form {'topic': qos}
 * @param {Object} [opts] - optional subscription options, includes:
 *    {Number} qos - subscribe qos level
 * @param {Function} [callback] - function(err, granted){} where:
 *    {Error} err - subscription error (none at the moment!)
 *    {Array} granted - array of {topic: 't', qos: 0}
 * @returns {MqttClient} this - for chaining
 * @api public
 * @example client.subscribe('topic');
 * @example client.subscribe('topic', {qos: 1});
 * @example client.subscribe({'topic': {qos: 0}, 'topic2': {qos: 1}}, console.log);
 * @example client.subscribe('topic', console.log);
 */
MqttClient.prototype.subscribe = function () {
  const that = this
  const args = new Array(arguments.length)
  for (let i = 0; i < arguments.length; i++) {
    args[i] = arguments[i]
  }
  const subs = []
  let obj = args.shift()
  const resubscribe = obj.resubscribe
  let callback = args.pop() || nop
  let opts = args.pop()
  const version = this.options.protocolVersion

  delete obj.resubscribe

  if (typeof obj === 'string') {
    obj = [obj]
  }

  if (typeof callback !== 'function') {
    opts = callback
    callback = nop
  }

  const invalidTopic = validations.validateTopics(obj)
  if (invalidTopic !== null) {
    setImmediate(callback, new Error('Invalid topic ' + invalidTopic))
    return this
  }

  if (this._checkDisconnecting(callback)) {
    debug('subscribe: discconecting true')
    return this
  }

  const defaultOpts = {
    qos: 0
  }
  if (version === 5) {
    defaultOpts.nl = false
    defaultOpts.rap = false
    defaultOpts.rh = 0
  }
  opts = xtend(defaultOpts, opts)

  if (Array.isArray(obj)) {
    obj.forEach(function (topic) {
      debug('subscribe: array topic %s', topic)
      if (!Object.prototype.hasOwnProperty.call(that._resubscribeTopics, topic) ||
        that._resubscribeTopics[topic].qos < opts.qos ||
          resubscribe) {
        const currentOpts = {
          topic: topic,
          qos: opts.qos
        }
        if (version === 5) {
          currentOpts.nl = opts.nl
          currentOpts.rap = opts.rap
          currentOpts.rh = opts.rh
          currentOpts.properties = opts.properties
        }
        debug('subscribe: pushing topic `%s` and qos `%s` to subs list', currentOpts.topic, currentOpts.qos)
        subs.push(currentOpts)
      }
    })
  } else {
    Object
      .keys(obj)
      .forEach(function (k) {
        debug('subscribe: object topic %s', k)
        if (!Object.prototype.hasOwnProperty.call(that._resubscribeTopics, k) ||
          that._resubscribeTopics[k].qos < obj[k].qos ||
            resubscribe) {
          const currentOpts = {
            topic: k,
            qos: obj[k].qos
          }
          if (version === 5) {
            currentOpts.nl = obj[k].nl
            currentOpts.rap = obj[k].rap
            currentOpts.rh = obj[k].rh
            currentOpts.properties = opts.properties
          }
          debug('subscribe: pushing `%s` to subs list', currentOpts)
          subs.push(currentOpts)
        }
      })
  }

  if (!subs.length) {
    callback(null, [])
    return this
  }

  const subscribeProc = function () {
    const messageId = that._nextId()
    if (messageId === null) {
      debug('No messageId left')
      return false
    }

    const packet = {
      cmd: 'subscribe',
      subscriptions: subs,
      qos: 1,
      retain: false,
      dup: false,
      messageId: messageId
    }

    if (opts.properties) {
      packet.properties = opts.properties
    }

    // subscriptions to resubscribe to in case of disconnect
    if (that.options.resubscribe) {
      debug('subscribe :: resubscribe true')
      const topics = []
      subs.forEach(function (sub) {
        if (that.options.reconnectPeriod > 0) {
          const topic = { qos: sub.qos }
          if (version === 5) {
            topic.nl = sub.nl || false
            topic.rap = sub.rap || false
            topic.rh = sub.rh || 0
            topic.properties = sub.properties
          }
          that._resubscribeTopics[sub.topic] = topic
          topics.push(sub.topic)
        }
      })
      that.messageIdToTopic[packet.messageId] = topics
    }

    that.outgoing[packet.messageId] = {
      volatile: true,
      cb: function (err, packet) {
        if (!err) {
          const granted = packet.granted
          for (let i = 0; i < granted.length; i += 1) {
            subs[i].qos = granted[i]
          }
        }

        callback(err, subs)
      }
    }
    debug('subscribe :: call _sendPacket')
    that._sendPacket(packet)
    return true
  }

  if (this._storeProcessing || this._storeProcessingQueue.length > 0 || !subscribeProc()) {
    this._storeProcessingQueue.push(
      {
        invoke: subscribeProc,
        callback: callback
      }
    )
  }

  return this
}

/**
 * unsubscribe - unsubscribe from topic(s)
 *
 * @param {String, Array} topic - topics to unsubscribe from
 * @param {Object} [opts] - optional subscription options, includes:
 *    {Object} properties - properties of unsubscribe packet
 * @param {Function} [callback] - callback fired on unsuback
 * @returns {MqttClient} this - for chaining
 * @api public
 * @example client.unsubscribe('topic');
 * @example client.unsubscribe('topic', console.log);
 */
MqttClient.prototype.unsubscribe = function () {
  const that = this
  const args = new Array(arguments.length)
  for (let i = 0; i < arguments.length; i++) {
    args[i] = arguments[i]
  }
  let topic = args.shift()
  let callback = args.pop() || nop
  let opts = args.pop()
  if (typeof topic === 'string') {
    topic = [topic]
  }

  if (typeof callback !== 'function') {
    opts = callback
    callback = nop
  }

  const invalidTopic = validations.validateTopics(topic)
  if (invalidTopic !== null) {
    setImmediate(callback, new Error('Invalid topic ' + invalidTopic))
    return this
  }

  if (that._checkDisconnecting(callback)) {
    return this
  }

  const unsubscribeProc = function () {
    const messageId = that._nextId()
    if (messageId === null) {
      debug('No messageId left')
      return false
    }
    const packet = {
      cmd: 'unsubscribe',
      qos: 1,
      messageId: messageId
    }

    if (typeof topic === 'string') {
      packet.unsubscriptions = [topic]
    } else if (Array.isArray(topic)) {
      packet.unsubscriptions = topic
    }

    if (that.options.resubscribe) {
      packet.unsubscriptions.forEach(function (topic) {
        delete that._resubscribeTopics[topic]
      })
    }

    if (typeof opts === 'object' && opts.properties) {
      packet.properties = opts.properties
    }

    that.outgoing[packet.messageId] = {
      volatile: true,
      cb: callback
    }

    debug('unsubscribe: call _sendPacket')
    that._sendPacket(packet)

    return true
  }

  if (this._storeProcessing || this._storeProcessingQueue.length > 0 || !unsubscribeProc()) {
    this._storeProcessingQueue.push(
      {
        invoke: unsubscribeProc,
        callback: callback
      }
    )
  }

  return this
}

/**
 * end - close connection
 *
 * @returns {MqttClient} this - for chaining
 * @param {Boolean} force - do not wait for all in-flight messages to be acked
 * @param {Object} opts - added to the disconnect packet
 * @param {Function} cb - called when the client has been closed
 *
 * @api public
 */
MqttClient.prototype.end = function (force, opts, cb) {
  const that = this

  debug('end :: (%s)', this.options.clientId)

  if (force == null || typeof force !== 'boolean') {
    cb = opts || nop
    opts = force
    force = false
    if (typeof opts !== 'object') {
      cb = opts
      opts = null
      if (typeof cb !== 'function') {
        cb = nop
      }
    }
  }

  if (typeof opts !== 'object') {
    cb = opts
    opts = null
  }

  debug('end :: cb? %s', !!cb)
  cb = cb || nop

  function closeStores () {
    debug('end :: closeStores: closing incoming and outgoing stores')
    that.disconnected = true
    that.incomingStore.close(function (e1) {
      that.outgoingStore.close(function (e2) {
        debug('end :: closeStores: emitting end')
        that.emit('end')
        if (cb) {
          const err = e1 || e2
          debug('end :: closeStores: invoking callback with args')
          cb(err)
        }
      })
    })
    if (that._deferredReconnect) {
      that._deferredReconnect()
    }
  }

  function finish () {
    // defer closesStores of an I/O cycle,
    // just to make sure things are
    // ok for websockets
    debug('end :: (%s) :: finish :: calling _cleanUp with force %s', that.options.clientId, force)
    that._cleanUp(force, () => {
      debug('end :: finish :: calling process.nextTick on closeStores')
      // const boundProcess = nextTick.bind(null, closeStores)
      nextTick(closeStores.bind(that))
    }, opts)
  }

  if (this.disconnecting) {
    cb()
    return this
  }

  this._clearReconnect()

  this.disconnecting = true

  if (!force && Object.keys(this.outgoing).length > 0) {
    // wait 10ms, just to be sure we received all of it
    debug('end :: (%s) :: calling finish in 10ms once outgoing is empty', that.options.clientId)
    this.once('outgoingEmpty', setTimeout.bind(null, finish, 10))
  } else {
    debug('end :: (%s) :: immediately calling finish', that.options.clientId)
    finish()
  }

  return this
}

/**
 * removeOutgoingMessage - remove a message in outgoing store
 * the outgoing callback will be called withe Error('Message removed') if the message is removed
 *
 * @param {Number} messageId - messageId to remove message
 * @returns {MqttClient} this - for chaining
 * @api public
 *
 * @example client.removeOutgoingMessage(client.getLastAllocated());
 */
MqttClient.prototype.removeOutgoingMessage = function (messageId) {
  const cb = this.outgoing[messageId] ? this.outgoing[messageId].cb : null
  delete this.outgoing[messageId]
  this.outgoingStore.del({ messageId: messageId }, function () {
    cb(new Error('Message removed'))
  })
  return this
}

/**
 * reconnect - connect again using the same options as connect()
 *
 * @param {Object} [opts] - optional reconnect options, includes:
 *    {Store} incomingStore - a store for the incoming packets
 *    {Store} outgoingStore - a store for the outgoing packets
 *    if opts is not given, current stores are used
 * @returns {MqttClient} this - for chaining
 *
 * @api public
 */
MqttClient.prototype.reconnect = function (opts) {
  debug('client reconnect')
  const that = this
  const f = function () {
    if (opts) {
      that.options.incomingStore = opts.incomingStore
      that.options.outgoingStore = opts.outgoingStore
    } else {
      that.options.incomingStore = null
      that.options.outgoingStore = null
    }
    that.incomingStore = that.options.incomingStore || new Store()
    that.outgoingStore = that.options.outgoingStore || new Store()
    that.disconnecting = false
    that.disconnected = false
    that._deferredReconnect = null
    that._reconnect()
  }

  if (this.disconnecting && !this.disconnected) {
    this._deferredReconnect = f
  } else {
    f()
  }
  return this
}

/**
 * _reconnect - implement reconnection
 * @api privateish
 */
MqttClient.prototype._reconnect = function () {
  debug('_reconnect: emitting reconnect to client')
  this.emit('reconnect')
  if (this.connected) {
    this.end(() => { this._setupStream() })
    debug('client already connected. disconnecting first.')
  } else {
    debug('_reconnect: calling _setupStream')
    this._setupStream()
  }
}

/**
 * _setupReconnect - setup reconnect timer
 */
MqttClient.prototype._setupReconnect = function () {
  const that = this

  if (!that.disconnecting && !that.reconnectTimer && (that.options.reconnectPeriod > 0)) {
    if (!this.reconnecting) {
      debug('_setupReconnect :: emit `offline` state')
      this.emit('offline')
      debug('_setupReconnect :: set `reconnecting` to `true`')
      this.reconnecting = true
    }
    debug('_setupReconnect :: setting reconnectTimer for %d ms', that.options.reconnectPeriod)
    that.reconnectTimer = setInterval(function () {
      debug('reconnectTimer :: reconnect triggered!')
      that._reconnect()
    }, that.options.reconnectPeriod)
  } else {
    debug('_setupReconnect :: doing nothing...')
  }
}

/**
 * _clearReconnect - clear the reconnect timer
 */
MqttClient.prototype._clearReconnect = function () {
  debug('_clearReconnect : clearing reconnect timer')
  if (this.reconnectTimer) {
    clearInterval(this.reconnectTimer)
    this.reconnectTimer = null
  }
}

/**
 * _cleanUp - clean up on connection end
 * @api private
 */
MqttClient.prototype._cleanUp = function (forced, done) {
  const opts = arguments[2]
  if (done) {
    debug('_cleanUp :: done callback provided for on stream close')
    this.stream.on('close', done)
  }

  debug('_cleanUp :: forced? %s', forced)
  if (forced) {
    if ((this.options.reconnectPeriod === 0) && this.options.clean) {
      flush(this.outgoing)
    }
    debug('_cleanUp :: (%s) :: destroying stream', this.options.clientId)
    this.stream.destroy()
  } else {
    const packet = xtend({ cmd: 'disconnect' }, opts)
    debug('_cleanUp :: (%s) :: call _sendPacket with disconnect packet', this.options.clientId)
    this._sendPacket(
      packet,
      setImmediate.bind(
        null,
        this.stream.end.bind(this.stream)
      )
    )
  }

  if (!this.disconnecting) {
    debug('_cleanUp :: client not disconnecting. Clearing and resetting reconnect.')
    this._clearReconnect()
    this._setupReconnect()
  }

  if (this.pingTimer !== null) {
    debug('_cleanUp :: clearing pingTimer')
    this.pingTimer.clear()
    this.pingTimer = null
  }

  if (done && !this.connected) {
    debug('_cleanUp :: (%s) :: removing stream `done` callback `close` listener', this.options.clientId)
    this.stream.removeListener('close', done)
    done()
  }
}

/**
 * _sendPacket - send or queue a packet
 * @param {Object} packet - packet options
 * @param {Function} cb - callback when the packet is sent
 * @param {Function} cbStorePut - called when message is put into outgoingStore
 * @api private
 */
MqttClient.prototype._sendPacket = function (packet, cb, cbStorePut) {
  debug('_sendPacket :: (%s) ::  start', this.options.clientId)
  cbStorePut = cbStorePut || nop
  cb = cb || nop

  const err = applyTopicAlias(this, packet)
  if (err) {
    cb(err)
    return
  }

  if (!this.connected) {
    // allow auth packets to be sent while authenticating with the broker (mqtt5 enhanced auth)
    if (packet.cmd === 'auth') {
      this._shiftPingInterval()
      sendPacket(this, packet, cb)
      return
    }

    debug('_sendPacket :: client not connected. Storing packet offline.')
    this._storePacket(packet, cb, cbStorePut)
    return
  }

  // When sending a packet, reschedule the ping timer
  this._shiftPingInterval()

  switch (packet.cmd) {
    case 'publish':
      break
    case 'pubrel':
      storeAndSend(this, packet, cb, cbStorePut)
      return
    default:
      sendPacket(this, packet, cb)
      return
  }

  switch (packet.qos) {
    case 2:
    case 1:
      storeAndSend(this, packet, cb, cbStorePut)
      break
    /**
     * no need of case here since it will be caught by default
     * and jshint comply that before default it must be a break
     * anyway it will result in -1 evaluation
     */
    case 0:
      /* falls through */
    default:
      sendPacket(this, packet, cb)
      break
  }
  debug('_sendPacket :: (%s) ::  end', this.options.clientId)
}

/**
 * _storePacket - queue a packet
 * @param {Object} packet - packet options
 * @param {Function} cb - callback when the packet is sent
 * @param {Function} cbStorePut - called when message is put into outgoingStore
 * @api private
 */
MqttClient.prototype._storePacket = function (packet, cb, cbStorePut) {
  debug('_storePacket :: packet: %o', packet)
  debug('_storePacket :: cb? %s', !!cb)
  cbStorePut = cbStorePut || nop

  let storePacket = packet
  if (storePacket.cmd === 'publish') {
    // The original packet is for sending.
    // The cloned storePacket is for storing to resend on reconnect.
    // Topic Alias must not be used after disconnected.
    storePacket = clone(packet)
    const err = removeTopicAliasAndRecoverTopicName(this, storePacket)
    if (err) {
      return cb && cb(err)
    }
  }
  // check that the packet is not a qos of 0, or that the command is not a publish
  if (((storePacket.qos || 0) === 0 && this.queueQoSZero) || storePacket.cmd !== 'publish') {
    this.queue.push({ packet: storePacket, cb: cb })
  } else if (storePacket.qos > 0) {
    cb = this.outgoing[storePacket.messageId] ? this.outgoing[storePacket.messageId].cb : null
    this.outgoingStore.put(storePacket, function (err) {
      if (err) {
        return cb && cb(err)
      }
      cbStorePut()
    })
  } else if (cb) {
    cb(new Error('No connection to broker'))
  }
}

/**
 * _setupPingTimer - setup the ping timer
 *
 * @api private
 */
MqttClient.prototype._setupPingTimer = function () {
  debug('_setupPingTimer :: keepalive %d (seconds)', this.options.keepalive)
  const that = this

  if (!this.pingTimer && this.options.keepalive) {
    this.pingResp = true
    this.pingTimer = reInterval(function () {
      that._checkPing()
    }, this.options.keepalive * 1000)
  }
}

/**
 * _shiftPingInterval - reschedule the ping interval
 *
 * @api private
 */
MqttClient.prototype._shiftPingInterval = function () {
  if (this.pingTimer && this.options.keepalive && this.options.reschedulePings) {
    this.pingTimer.reschedule(this.options.keepalive * 1000)
  }
}
/**
 * _checkPing - check if a pingresp has come back, and ping the server again
 *
 * @api private
 */
MqttClient.prototype._checkPing = function () {
  debug('_checkPing :: checking ping...')
  if (this.pingResp) {
    debug('_checkPing :: ping response received. Clearing flag and sending `pingreq`')
    this.pingResp = false
    this._sendPacket({ cmd: 'pingreq' })
  } else {
    // do a forced cleanup since socket will be in bad shape
    debug('_checkPing :: calling _cleanUp with force true')
    this._cleanUp(true)
  }
}

/**
 * _handlePingresp - handle a pingresp
 *
 * @api private
 */
MqttClient.prototype._handlePingresp = function () {
  this.pingResp = true
}

/**
 * _handleConnack
 *
 * @param {Object} packet
 * @api private
 */
MqttClient.prototype._handleConnack = function (packet) {
  debug('_handleConnack')
  const options = this.options
  const version = options.protocolVersion
  const rc = version === 5 ? packet.reasonCode : packet.returnCode

  clearTimeout(this.connackTimer)
  delete this.topicAliasSend

  if (packet.properties) {
    if (packet.properties.topicAliasMaximum) {
      if (packet.properties.topicAliasMaximum > 0xffff) {
        this.emit('error', new Error('topicAliasMaximum from broker is out of range'))
        return
      }
      if (packet.properties.topicAliasMaximum > 0) {
        this.topicAliasSend = new TopicAliasSend(packet.properties.topicAliasMaximum)
      }
    }
    if (packet.properties.serverKeepAlive && options.keepalive) {
      options.keepalive = packet.properties.serverKeepAlive
      this._shiftPingInterval()
    }
    if (packet.properties.maximumPacketSize) {
      if (!options.properties) { options.properties = {} }
      options.properties.maximumPacketSize = packet.properties.maximumPacketSize
    }
  }

  if (rc === 0) {
    this.reconnecting = false
    this._onConnect(packet)
  } else if (rc > 0) {
    const err = new Error('Connection refused: ' + errors[rc])
    err.code = rc
    this.emit('error', err)
  }
}

MqttClient.prototype._handleAuth = function (packet) {
  const options = this.options
  const version = options.protocolVersion
  const rc = version === 5 ? packet.reasonCode : packet.returnCode

  if (version !== 5) {
    const err = new Error('Protocol error: Auth packets are only supported in MQTT 5. Your version:' + version)
    err.code = rc
    this.emit('error', err)
    return
  }

  const that = this
  this.handleAuth(packet, function (err, packet) {
    if (err) {
      that.emit('error', err)
      return
    }

    if (rc === 24) {
      that.reconnecting = false
      that._sendPacket(packet)
    } else {
      const error = new Error('Connection refused: ' + errors[rc])
      err.code = rc
      that.emit('error', error)
    }
  })
}

/**
 * @param packet the packet received by the broker
 * @return the auth packet to be returned to the broker
 * @api public
 */
MqttClient.prototype.handleAuth = function (packet, callback) {
  callback()
}

/**
 * _handlePublish
 *
 * @param {Object} packet
 * @api private
 */
/*
those late 2 case should be rewrite to comply with coding style:

case 1:
case 0:
  // do not wait sending a puback
  // no callback passed
  if (1 === qos) {
    this._sendPacket({
      cmd: 'puback',
      messageId: messageId
    });
  }
  // emit the message event for both qos 1 and 0
  this.emit('message', topic, message, packet);
  this.handleMessage(packet, done);
  break;
default:
  // do nothing but every switch mus have a default
  // log or throw an error about unknown qos
  break;

for now i just suppressed the warnings
*/
MqttClient.prototype._handlePublish = function (packet, done) {
  debug('_handlePublish: packet %o', packet)
  done = typeof done !== 'undefined' ? done : nop
  let topic = packet.topic.toString()
  const message = packet.payload
  const qos = packet.qos
  const messageId = packet.messageId
  const that = this
  const options = this.options
  const validReasonCodes = [0, 16, 128, 131, 135, 144, 145, 151, 153]
  if (this.options.protocolVersion === 5) {
    let alias
    if (packet.properties) {
      alias = packet.properties.topicAlias
    }
    if (typeof alias !== 'undefined') {
      if (topic.length === 0) {
        if (alias > 0 && alias <= 0xffff) {
          const gotTopic = this.topicAliasRecv.getTopicByAlias(alias)
          if (gotTopic) {
            topic = gotTopic
            debug('_handlePublish :: topic complemented by alias. topic: %s - alias: %d', topic, alias)
          } else {
            debug('_handlePublish :: unregistered topic alias. alias: %d', alias)
            this.emit('error', new Error('Received unregistered Topic Alias'))
            return
          }
        } else {
          debug('_handlePublish :: topic alias out of range. alias: %d', alias)
          this.emit('error', new Error('Received Topic Alias is out of range'))
          return
        }
      } else {
        if (this.topicAliasRecv.put(topic, alias)) {
          debug('_handlePublish :: registered topic: %s - alias: %d', topic, alias)
        } else {
          debug('_handlePublish :: topic alias out of range. alias: %d', alias)
          this.emit('error', new Error('Received Topic Alias is out of range'))
          return
        }
      }
    }
  }
  debug('_handlePublish: qos %d', qos)
  switch (qos) {
    case 2: {
      options.customHandleAcks(topic, message, packet, function (error, code) {
        if (!(error instanceof Error)) {
          code = error
          error = null
        }
        if (error) { return that.emit('error', error) }
        if (validReasonCodes.indexOf(code) === -1) { return that.emit('error', new Error('Wrong reason code for pubrec')) }
        if (code) {
          that._sendPacket({ cmd: 'pubrec', messageId: messageId, reasonCode: code }, done)
        } else {
          that.incomingStore.put(packet, function () {
            that._sendPacket({ cmd: 'pubrec', messageId: messageId }, done)
          })
        }
      })
      break
    }
    case 1: {
      // emit the message event
      options.customHandleAcks(topic, message, packet, function (error, code) {
        if (!(error instanceof Error)) {
          code = error
          error = null
        }
        if (error) { return that.emit('error', error) }
        if (validReasonCodes.indexOf(code) === -1) { return that.emit('error', new Error('Wrong reason code for puback')) }
        if (!code) { that.emit('message', topic, message, packet) }
        that.handleMessage(packet, function (err) {
          if (err) {
            return done && done(err)
          }
          that._sendPacket({ cmd: 'puback', messageId: messageId, reasonCode: code }, done)
        })
      })
      break
    }
    case 0:
      // emit the message event
      this.emit('message', topic, message, packet)
      this.handleMessage(packet, done)
      break
    default:
      // do nothing
      debug('_handlePublish: unknown QoS. Doing nothing.')
      // log or throw an error about unknown qos
      break
  }
}

/**
 * Handle messages with backpressure support, one at a time.
 * Override at will.
 *
 * @param Packet packet the packet
 * @param Function callback call when finished
 * @api public
 */
MqttClient.prototype.handleMessage = function (packet, callback) {
  callback()
}

/**
 * _handleAck
 *
 * @param {Object} packet
 * @api private
 */

MqttClient.prototype._handleAck = function (packet) {
  /* eslint no-fallthrough: "off" */
  const messageId = packet.messageId
  const type = packet.cmd
  let response = null
  const cb = this.outgoing[messageId] ? this.outgoing[messageId].cb : null
  const that = this
  let err

  // Checking `!cb` happens to work, but it's not technically "correct".
  //
  // Why? This code assumes that "no callback" is the same as that "we're not
  // waiting for responses" (puback, pubrec, pubcomp, suback, or unsuback).
  //
  // It would be better to check `if (!this.outgoing[messageId])` here, but
  // there's no reason to change it and risk (another) regression.
  //
  // The only reason this code works is becaues code in MqttClient.publish,
  // MqttClinet.subscribe, and MqttClient.unsubscribe ensures that we will
  // have a callback even if the user doesn't pass one in.)
  if (!cb) {
    debug('_handleAck :: Server sent an ack in error. Ignoring.')
    // Server sent an ack in error, ignore it.
    return
  }

  // Process
  debug('_handleAck :: packet type', type)
  switch (type) {
    case 'pubcomp':
      // same thing as puback for QoS 2
    case 'puback': {
      const pubackRC = packet.reasonCode
      // Callback - we're done
      if (pubackRC && pubackRC > 0 && pubackRC !== 16) {
        err = new Error('Publish error: ' + errors[pubackRC])
        err.code = pubackRC
        cb(err, packet)
      }
      delete this.outgoing[messageId]
      this.outgoingStore.del(packet, cb)
      this.messageIdProvider.deallocate(messageId)
      this._invokeStoreProcessingQueue()
      break
    }
    case 'pubrec': {
      response = {
        cmd: 'pubrel',
        qos: 2,
        messageId: messageId
      }
      const pubrecRC = packet.reasonCode

      if (pubrecRC && pubrecRC > 0 && pubrecRC !== 16) {
        err = new Error('Publish error: ' + errors[pubrecRC])
        err.code = pubrecRC
        cb(err, packet)
      } else {
        this._sendPacket(response)
      }
      break
    }
    case 'suback': {
      delete this.outgoing[messageId]
      this.messageIdProvider.deallocate(messageId)
      for (let grantedI = 0; grantedI < packet.granted.length; grantedI++) {
        if ((packet.granted[grantedI] & 0x80) !== 0) {
          // suback with Failure status
          const topics = this.messageIdToTopic[messageId]
          if (topics) {
            topics.forEach(function (topic) {
              delete that._resubscribeTopics[topic]
            })
          }
        }
      }
      this._invokeStoreProcessingQueue()
      cb(null, packet)
      break
    }
    case 'unsuback': {
      delete this.outgoing[messageId]
      this.messageIdProvider.deallocate(messageId)
      this._invokeStoreProcessingQueue()
      cb(null)
      break
    }
    default:
      that.emit('error', new Error('unrecognized packet type'))
  }

  if (this.disconnecting &&
      Object.keys(this.outgoing).length === 0) {
    this.emit('outgoingEmpty')
  }
}

/**
 * _handlePubrel
 *
 * @param {Object} packet
 * @api private
 */
MqttClient.prototype._handlePubrel = function (packet, callback) {
  debug('handling pubrel packet')
  callback = typeof callback !== 'undefined' ? callback : nop
  const messageId = packet.messageId
  const that = this

  const comp = { cmd: 'pubcomp', messageId: messageId }

  that.incomingStore.get(packet, function (err, pub) {
    if (!err) {
      that.emit('message', pub.topic, pub.payload, pub)
      that.handleMessage(pub, function (err) {
        if (err) {
          return callback(err)
        }
        that.incomingStore.del(pub, nop)
        that._sendPacket(comp, callback)
      })
    } else {
      that._sendPacket(comp, callback)
    }
  })
}

/**
 * _handleDisconnect
 *
 * @param {Object} packet
 * @api private
 */
MqttClient.prototype._handleDisconnect = function (packet) {
  this.emit('disconnect', packet)
}

/**
 * _nextId
 * @return unsigned int
 */
MqttClient.prototype._nextId = function () {
  return this.messageIdProvider.allocate()
}

/**
 * getLastMessageId
 * @return unsigned int
 */
MqttClient.prototype.getLastMessageId = function () {
  return this.messageIdProvider.getLastAllocated()
}

/**
 * _resubscribe
 * @api private
 */
MqttClient.prototype._resubscribe = function () {
  debug('_resubscribe')
  const _resubscribeTopicsKeys = Object.keys(this._resubscribeTopics)
  if (!this._firstConnection &&
      (this.options.clean || (this.options.protocolVersion === 5 && !this.connackPacket.sessionPresent)) &&
      _resubscribeTopicsKeys.length > 0) {
    if (this.options.resubscribe) {
      if (this.options.protocolVersion === 5) {
        debug('_resubscribe: protocolVersion 5')
        for (let topicI = 0; topicI < _resubscribeTopicsKeys.length; topicI++) {
          const resubscribeTopic = {}
          resubscribeTopic[_resubscribeTopicsKeys[topicI]] = this._resubscribeTopics[_resubscribeTopicsKeys[topicI]]
          resubscribeTopic.resubscribe = true
          this.subscribe(resubscribeTopic, { properties: resubscribeTopic[_resubscribeTopicsKeys[topicI]].properties })
        }
      } else {
        this._resubscribeTopics.resubscribe = true
        this.subscribe(this._resubscribeTopics)
      }
    } else {
      this._resubscribeTopics = {}
    }
  }

  this._firstConnection = false
}

/**
 * _onConnect
 *
 * @api private
 */
MqttClient.prototype._onConnect = function (packet) {
  if (this.disconnected) {
    this.emit('connect', packet)
    return
  }

  const that = this

  this.connackPacket = packet
  this.messageIdProvider.clear()
  this._setupPingTimer()

  this.connected = true

  function startStreamProcess () {
    let outStore = that.outgoingStore.createStream()

    function clearStoreProcessing () {
      that._storeProcessing = false
      that._packetIdsDuringStoreProcessing = {}
    }

    that.once('close', remove)
    outStore.on('error', function (err) {
      clearStoreProcessing()
      that._flushStoreProcessingQueue()
      that.removeListener('close', remove)
      that.emit('error', err)
    })

    function remove () {
      outStore.destroy()
      outStore = null
      that._flushStoreProcessingQueue()
      clearStoreProcessing()
    }

    function storeDeliver () {
      // edge case, we wrapped this twice
      if (!outStore) {
        return
      }
      that._storeProcessing = true

      const packet = outStore.read(1)

      let cb

      if (!packet) {
        // read when data is available in the future
        outStore.once('readable', storeDeliver)
        return
      }

      // Skip already processed store packets
      if (that._packetIdsDuringStoreProcessing[packet.messageId]) {
        storeDeliver()
        return
      }

      // Avoid unnecessary stream read operations when disconnected
      if (!that.disconnecting && !that.reconnectTimer) {
        cb = that.outgoing[packet.messageId] ? that.outgoing[packet.messageId].cb : null
        that.outgoing[packet.messageId] = {
          volatile: false,
          cb: function (err, status) {
            // Ensure that the original callback passed in to publish gets invoked
            if (cb) {
              cb(err, status)
            }

            storeDeliver()
          }
        }
        that._packetIdsDuringStoreProcessing[packet.messageId] = true
        if (that.messageIdProvider.register(packet.messageId)) {
          that._sendPacket(packet)
        } else {
          debug('messageId: %d has already used.', packet.messageId)
        }
      } else if (outStore.destroy) {
        outStore.destroy()
      }
    }

    outStore.on('end', function () {
      let allProcessed = true
      for (const id in that._packetIdsDuringStoreProcessing) {
        if (!that._packetIdsDuringStoreProcessing[id]) {
          allProcessed = false
          break
        }
      }
      if (allProcessed) {
        clearStoreProcessing()
        that.removeListener('close', remove)
        that._invokeAllStoreProcessingQueue()
        that.emit('connect', packet)
      } else {
        startStreamProcess()
      }
    })
    storeDeliver()
  }
  // start flowing
  startStreamProcess()
}

MqttClient.prototype._invokeStoreProcessingQueue = function () {
  if (this._storeProcessingQueue.length > 0) {
    const f = this._storeProcessingQueue[0]
    if (f && f.invoke()) {
      this._storeProcessingQueue.shift()
      return true
    }
  }
  return false
}

MqttClient.prototype._invokeAllStoreProcessingQueue = function () {
  while (this._invokeStoreProcessingQueue()) { /* empty */ }
}

MqttClient.prototype._flushStoreProcessingQueue = function () {
  for (const f of this._storeProcessingQueue) {
    if (f.cbStorePut) f.cbStorePut(new Error('Connection closed'))
    if (f.callback) f.callback(new Error('Connection closed'))
  }
  this._storeProcessingQueue.splice(0)
}

module.exports = MqttClient

}).call(this)}).call(this,require('_process'),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{"./default-message-id-provider":7,"./store":8,"./topic-alias-recv":9,"./topic-alias-send":10,"./validations":11,"_process":50,"debug":18,"events":22,"inherits":24,"mqtt-packet":40,"readable-stream":69,"reinterval":70,"rfdc/default":71,"xtend":81}],2:[function(require,module,exports){
'use strict'

const { Buffer } = require('buffer')
const Transform = require('readable-stream').Transform
const duplexify = require('duplexify')

/* global FileReader */
let my
let proxy
let stream
let isInitialized = false

function buildProxy () {
  const proxy = new Transform()
  proxy._write = function (chunk, encoding, next) {
    my.sendSocketMessage({
      data: chunk.buffer,
      success: function () {
        next()
      },
      fail: function () {
        next(new Error())
      }
    })
  }
  proxy._flush = function socketEnd (done) {
    my.closeSocket({
      success: function () {
        done()
      }
    })
  }

  return proxy
}

function setDefaultOpts (opts) {
  if (!opts.hostname) {
    opts.hostname = 'localhost'
  }
  if (!opts.path) {
    opts.path = '/'
  }

  if (!opts.wsOptions) {
    opts.wsOptions = {}
  }
}

function buildUrl (opts, client) {
  const protocol = opts.protocol === 'alis' ? 'wss' : 'ws'
  let url = protocol + '://' + opts.hostname + opts.path
  if (opts.port && opts.port !== 80 && opts.port !== 443) {
    url = protocol + '://' + opts.hostname + ':' + opts.port + opts.path
  }
  if (typeof (opts.transformWsUrl) === 'function') {
    url = opts.transformWsUrl(url, opts, client)
  }
  return url
}

function bindEventHandler () {
  if (isInitialized) return

  isInitialized = true

  my.onSocketOpen(function () {
    stream.setReadable(proxy)
    stream.setWritable(proxy)
    stream.emit('connect')
  })

  my.onSocketMessage(function (res) {
    if (typeof res.data === 'string') {
      const buffer = Buffer.from(res.data, 'base64')
      proxy.push(buffer)
    } else {
      const reader = new FileReader()
      reader.addEventListener('load', function () {
        let data = reader.result

        if (data instanceof ArrayBuffer) data = Buffer.from(data)
        else data = Buffer.from(data, 'utf8')
        proxy.push(data)
      })
      reader.readAsArrayBuffer(res.data)
    }
  })

  my.onSocketClose(function () {
    stream.end()
    stream.destroy()
  })

  my.onSocketError(function (res) {
    stream.destroy(res)
  })
}

function buildStream (client, opts) {
  opts.hostname = opts.hostname || opts.host

  if (!opts.hostname) {
    throw new Error('Could not determine host. Specify host manually.')
  }

  const websocketSubProtocol =
    (opts.protocolId === 'MQIsdp') && (opts.protocolVersion === 3)
      ? 'mqttv3.1'
      : 'mqtt'

  setDefaultOpts(opts)

  const url = buildUrl(opts, client)
  my = opts.my
  my.connectSocket({
    url: url,
    protocols: websocketSubProtocol
  })

  proxy = buildProxy()
  stream = duplexify.obj()

  bindEventHandler()

  return stream
}

module.exports = buildStream

},{"buffer":17,"duplexify":20,"readable-stream":69}],3:[function(require,module,exports){
'use strict'
const net = require('net')
const debug = require('debug')('mqttjs:tcp')

/*
  variables port and host can be removed since
  you have all required information in opts object
*/
function streamBuilder (client, opts) {
  opts.port = opts.port || 1883
  opts.hostname = opts.hostname || opts.host || 'localhost'

  const port = opts.port
  const host = opts.hostname

  debug('port %d and host %s', port, host)
  return net.createConnection(port, host)
}

module.exports = streamBuilder

},{"debug":18,"net":16}],4:[function(require,module,exports){
'use strict'
const tls = require('tls')
const net = require('net')
const debug = require('debug')('mqttjs:tls')

function buildBuilder (mqttClient, opts) {
  opts.port = opts.port || 8883
  opts.host = opts.hostname || opts.host || 'localhost'

  if (net.isIP(opts.host) === 0) {
    opts.servername = opts.host
  }

  opts.rejectUnauthorized = opts.rejectUnauthorized !== false

  delete opts.path

  debug('port %d host %s rejectUnauthorized %b', opts.port, opts.host, opts.rejectUnauthorized)

  const connection = tls.connect(opts)
  /* eslint no-use-before-define: [2, "nofunc"] */
  connection.on('secureConnect', function () {
    if (opts.rejectUnauthorized && !connection.authorized) {
      connection.emit('error', new Error('TLS not authorized'))
    } else {
      connection.removeListener('error', handleTLSerrors)
    }
  })

  function handleTLSerrors (err) {
    // How can I get verify this error is a tls error?
    if (opts.rejectUnauthorized) {
      mqttClient.emit('error', err)
    }

    // close this connection to match the behaviour of net
    // otherwise all we get is an error from the connection
    // and close event doesn't fire. This is a work around
    // to enable the reconnect code to work the same as with
    // net.createConnection
    connection.end()
  }

  connection.on('error', handleTLSerrors)
  return connection
}

module.exports = buildBuilder

},{"debug":18,"net":16,"tls":16}],5:[function(require,module,exports){
(function (process){(function (){
'use strict'

const { Buffer } = require('buffer')
const WS = require('ws')
const debug = require('debug')('mqttjs:ws')
const duplexify = require('duplexify')
const Transform = require('readable-stream').Transform

const WSS_OPTIONS = [
  'rejectUnauthorized',
  'ca',
  'cert',
  'key',
  'pfx',
  'passphrase'
]
// eslint-disable-next-line camelcase
const IS_BROWSER = (typeof process !== 'undefined' && process.title === 'browser') || typeof __webpack_require__ === 'function'
function buildUrl (opts, client) {
  let url = opts.protocol + '://' + opts.hostname + ':' + opts.port + opts.path
  if (typeof (opts.transformWsUrl) === 'function') {
    url = opts.transformWsUrl(url, opts, client)
  }
  return url
}

function setDefaultOpts (opts) {
  const options = opts
  if (!opts.hostname) {
    options.hostname = 'localhost'
  }
  if (!opts.port) {
    if (opts.protocol === 'wss') {
      options.port = 443
    } else {
      options.port = 80
    }
  }
  if (!opts.path) {
    options.path = '/'
  }

  if (!opts.wsOptions) {
    options.wsOptions = {}
  }
  if (!IS_BROWSER && opts.protocol === 'wss') {
    // Add cert/key/ca etc options
    WSS_OPTIONS.forEach(function (prop) {
      if (Object.prototype.hasOwnProperty.call(opts, prop) && !Object.prototype.hasOwnProperty.call(opts.wsOptions, prop)) {
        options.wsOptions[prop] = opts[prop]
      }
    })
  }

  return options
}

function setDefaultBrowserOpts (opts) {
  const options = setDefaultOpts(opts)

  if (!options.hostname) {
    options.hostname = options.host
  }

  if (!options.hostname) {
    // Throwing an error in a Web Worker if no `hostname` is given, because we
    // can not determine the `hostname` automatically.  If connecting to
    // localhost, please supply the `hostname` as an argument.
    if (typeof (document) === 'undefined') {
      throw new Error('Could not determine host. Specify host manually.')
    }
    const parsed = new URL(document.URL)
    options.hostname = parsed.hostname

    if (!options.port) {
      options.port = parsed.port
    }
  }

  // objectMode should be defined for logic
  if (options.objectMode === undefined) {
    options.objectMode = !(options.binary === true || options.binary === undefined)
  }

  return options
}

function createWebSocket (client, url, opts) {
  debug('createWebSocket')
  debug('protocol: ' + opts.protocolId + ' ' + opts.protocolVersion)
  const websocketSubProtocol =
    (opts.protocolId === 'MQIsdp') && (opts.protocolVersion === 3)
      ? 'mqttv3.1'
      : 'mqtt'

  debug('creating new Websocket for url: ' + url + ' and protocol: ' + websocketSubProtocol)
  const socket = new WS(url, [websocketSubProtocol], opts.wsOptions)
  return socket
}

function createBrowserWebSocket (client, opts) {
  const websocketSubProtocol =
  (opts.protocolId === 'MQIsdp') && (opts.protocolVersion === 3)
    ? 'mqttv3.1'
    : 'mqtt'

  const url = buildUrl(opts, client)
  /* global WebSocket */
  const socket = new WebSocket(url, [websocketSubProtocol])
  socket.binaryType = 'arraybuffer'
  return socket
}

function streamBuilder (client, opts) {
  debug('streamBuilder')
  const options = setDefaultOpts(opts)
  const url = buildUrl(options, client)
  const socket = createWebSocket(client, url, options)
  const webSocketStream = WS.createWebSocketStream(socket, options.wsOptions)
  webSocketStream.url = url
  socket.on('close', () => { webSocketStream.destroy() })
  return webSocketStream
}

function browserStreamBuilder (client, opts) {
  debug('browserStreamBuilder')
  let stream
  const options = setDefaultBrowserOpts(opts)
  // sets the maximum socket buffer size before throttling
  const bufferSize = options.browserBufferSize || 1024 * 512

  const bufferTimeout = opts.browserBufferTimeout || 1000

  const coerceToBuffer = !opts.objectMode

  const socket = createBrowserWebSocket(client, opts)

  const proxy = buildProxy(opts, socketWriteBrowser, socketEndBrowser)

  if (!opts.objectMode) {
    proxy._writev = writev
  }
  proxy.on('close', () => { socket.close() })

  const eventListenerSupport = (typeof socket.addEventListener !== 'undefined')

  // was already open when passed in
  if (socket.readyState === socket.OPEN) {
    stream = proxy
  } else {
    stream = stream = duplexify(undefined, undefined, opts)
    if (!opts.objectMode) {
      stream._writev = writev
    }

    if (eventListenerSupport) {
      socket.addEventListener('open', onopen)
    } else {
      socket.onopen = onopen
    }
  }

  stream.socket = socket

  if (eventListenerSupport) {
    socket.addEventListener('close', onclose)
    socket.addEventListener('error', onerror)
    socket.addEventListener('message', onmessage)
  } else {
    socket.onclose = onclose
    socket.onerror = onerror
    socket.onmessage = onmessage
  }

  // methods for browserStreamBuilder

  function buildProxy (options, socketWrite, socketEnd) {
    const proxy = new Transform({
      objectModeMode: options.objectMode
    })

    proxy._write = socketWrite
    proxy._flush = socketEnd

    return proxy
  }

  function onopen () {
    stream.setReadable(proxy)
    stream.setWritable(proxy)
    stream.emit('connect')
  }

  function onclose () {
    stream.end()
    stream.destroy()
  }

  function onerror (err) {
    stream.destroy(err)
  }

  function onmessage (event) {
    let data = event.data
    if (data instanceof ArrayBuffer) data = Buffer.from(data)
    else data = Buffer.from(data, 'utf8')
    proxy.push(data)
  }

  // this is to be enabled only if objectMode is false
  function writev (chunks, cb) {
    const buffers = new Array(chunks.length)
    for (let i = 0; i < chunks.length; i++) {
      if (typeof chunks[i].chunk === 'string') {
        buffers[i] = Buffer.from(chunks[i], 'utf8')
      } else {
        buffers[i] = chunks[i].chunk
      }
    }

    this._write(Buffer.concat(buffers), 'binary', cb)
  }

  function socketWriteBrowser (chunk, enc, next) {
    if (socket.bufferedAmount > bufferSize) {
      // throttle data until buffered amount is reduced.
      setTimeout(socketWriteBrowser, bufferTimeout, chunk, enc, next)
    }

    if (coerceToBuffer && typeof chunk === 'string') {
      chunk = Buffer.from(chunk, 'utf8')
    }

    try {
      socket.send(chunk)
    } catch (err) {
      return next(err)
    }

    next()
  }

  function socketEndBrowser (done) {
    socket.close()
    done()
  }

  // end methods for browserStreamBuilder

  return stream
}

if (IS_BROWSER) {
  module.exports = browserStreamBuilder
} else {
  module.exports = streamBuilder
}

}).call(this)}).call(this,require('_process'))
},{"_process":50,"buffer":17,"debug":18,"duplexify":20,"readable-stream":69,"ws":80}],6:[function(require,module,exports){
'use strict'

const { Buffer } = require('buffer')
const Transform = require('readable-stream').Transform
const duplexify = require('duplexify')

/* global wx */
let socketTask, proxy, stream

function buildProxy () {
  const proxy = new Transform()
  proxy._write = function (chunk, encoding, next) {
    socketTask.send({
      data: chunk.buffer,
      success: function () {
        next()
      },
      fail: function (errMsg) {
        next(new Error(errMsg))
      }
    })
  }
  proxy._flush = function socketEnd (done) {
    socketTask.close({
      success: function () {
        done()
      }
    })
  }

  return proxy
}

function setDefaultOpts (opts) {
  if (!opts.hostname) {
    opts.hostname = 'localhost'
  }
  if (!opts.path) {
    opts.path = '/'
  }

  if (!opts.wsOptions) {
    opts.wsOptions = {}
  }
}

function buildUrl (opts, client) {
  const protocol = opts.protocol === 'wxs' ? 'wss' : 'ws'
  let url = protocol + '://' + opts.hostname + opts.path
  if (opts.port && opts.port !== 80 && opts.port !== 443) {
    url = protocol + '://' + opts.hostname + ':' + opts.port + opts.path
  }
  if (typeof (opts.transformWsUrl) === 'function') {
    url = opts.transformWsUrl(url, opts, client)
  }
  return url
}

function bindEventHandler () {
  socketTask.onOpen(function () {
    stream.setReadable(proxy)
    stream.setWritable(proxy)
    stream.emit('connect')
  })

  socketTask.onMessage(function (res) {
    let data = res.data

    if (data instanceof ArrayBuffer) data = Buffer.from(data)
    else data = Buffer.from(data, 'utf8')
    proxy.push(data)
  })

  socketTask.onClose(function () {
    stream.end()
    stream.destroy()
  })

  socketTask.onError(function (res) {
    stream.destroy(new Error(res.errMsg))
  })
}

function buildStream (client, opts) {
  opts.hostname = opts.hostname || opts.host

  if (!opts.hostname) {
    throw new Error('Could not determine host. Specify host manually.')
  }

  const websocketSubProtocol =
    (opts.protocolId === 'MQIsdp') && (opts.protocolVersion === 3)
      ? 'mqttv3.1'
      : 'mqtt'

  setDefaultOpts(opts)

  const url = buildUrl(opts, client)
  socketTask = wx.connectSocket({
    url: url,
    protocols: [websocketSubProtocol]
  })

  proxy = buildProxy()
  stream = duplexify.obj()
  stream._destroy = function (err, cb) {
    socketTask.close({
      success: function () {
        cb && cb(err)
      }
    })
  }

  const destroyRef = stream.destroy
  stream.destroy = function () {
    stream.destroy = destroyRef

    const self = this
    setTimeout(function () {
      socketTask.close({
        fail: function () {
          self._destroy(new Error())
        }
      })
    }, 0)
  }.bind(stream)

  bindEventHandler()

  return stream
}

module.exports = buildStream

},{"buffer":17,"duplexify":20,"readable-stream":69}],7:[function(require,module,exports){
'use strict'

/**
 * DefaultMessageAllocator constructor
 * @constructor
 */
function DefaultMessageIdProvider () {
  if (!(this instanceof DefaultMessageIdProvider)) {
    return new DefaultMessageIdProvider()
  }

  /**
   * MessageIDs starting with 1
   * ensure that nextId is min. 1, see https://github.com/mqttjs/MQTT.js/issues/810
   */
  this.nextId = Math.max(1, Math.floor(Math.random() * 65535))
}

/**
 * allocate
 *
 * Get the next messageId.
 * @return unsigned int
 */
DefaultMessageIdProvider.prototype.allocate = function () {
  // id becomes current state of this.nextId and increments afterwards
  const id = this.nextId++
  // Ensure 16 bit unsigned int (max 65535, nextId got one higher)
  if (this.nextId === 65536) {
    this.nextId = 1
  }
  return id
}

/**
 * getLastAllocated
 * Get the last allocated messageId.
 * @return unsigned int
 */
DefaultMessageIdProvider.prototype.getLastAllocated = function () {
  return (this.nextId === 1) ? 65535 : (this.nextId - 1)
}

/**
 * register
 * Register messageId. If success return true, otherwise return false.
 * @param { unsigned int } - messageId to register,
 * @return boolean
 */
DefaultMessageIdProvider.prototype.register = function (messageId) {
  return true
}

/**
 * deallocate
 * Deallocate messageId.
 * @param { unsigned int } - messageId to deallocate,
 */
DefaultMessageIdProvider.prototype.deallocate = function (messageId) {
}

/**
 * clear
 * Deallocate all messageIds.
 */
DefaultMessageIdProvider.prototype.clear = function () {
}

module.exports = DefaultMessageIdProvider

},{}],8:[function(require,module,exports){
'use strict'

/**
 * Module dependencies
 */
const xtend = require('xtend')

const Readable = require('readable-stream').Readable
const streamsOpts = { objectMode: true }
const defaultStoreOptions = {
  clean: true
}

/**
 * In-memory implementation of the message store
 * This can actually be saved into files.
 *
 * @param {Object} [options] - store options
 */
function Store (options) {
  if (!(this instanceof Store)) {
    return new Store(options)
  }

  this.options = options || {}

  // Defaults
  this.options = xtend(defaultStoreOptions, options)

  this._inflights = new Map()
}

/**
 * Adds a packet to the store, a packet is
 * anything that has a messageId property.
 *
 */
Store.prototype.put = function (packet, cb) {
  this._inflights.set(packet.messageId, packet)

  if (cb) {
    cb()
  }

  return this
}

/**
 * Creates a stream with all the packets in the store
 *
 */
Store.prototype.createStream = function () {
  const stream = new Readable(streamsOpts)
  const values = []
  let destroyed = false
  let i = 0

  this._inflights.forEach(function (value, key) {
    values.push(value)
  })

  stream._read = function () {
    if (!destroyed && i < values.length) {
      this.push(values[i++])
    } else {
      this.push(null)
    }
  }

  stream.destroy = function () {
    if (destroyed) {
      return
    }

    const self = this

    destroyed = true

    setTimeout(function () {
      self.emit('close')
    }, 0)
  }

  return stream
}

/**
 * deletes a packet from the store.
 */
Store.prototype.del = function (packet, cb) {
  packet = this._inflights.get(packet.messageId)
  if (packet) {
    this._inflights.delete(packet.messageId)
    cb(null, packet)
  } else if (cb) {
    cb(new Error('missing packet'))
  }

  return this
}

/**
 * get a packet from the store.
 */
Store.prototype.get = function (packet, cb) {
  packet = this._inflights.get(packet.messageId)
  if (packet) {
    cb(null, packet)
  } else if (cb) {
    cb(new Error('missing packet'))
  }

  return this
}

/**
 * Close the store
 */
Store.prototype.close = function (cb) {
  if (this.options.clean) {
    this._inflights = null
  }
  if (cb) {
    cb()
  }
}

module.exports = Store

},{"readable-stream":69,"xtend":81}],9:[function(require,module,exports){
'use strict'

/**
 * Topic Alias receiving manager
 * This holds alias to topic map
 * @param {Number} [max] - topic alias maximum entries
 */
function TopicAliasRecv (max) {
  if (!(this instanceof TopicAliasRecv)) {
    return new TopicAliasRecv(max)
  }
  this.aliasToTopic = {}
  this.max = max
}

/**
 * Insert or update topic - alias entry.
 * @param {String} [topic] - topic
 * @param {Number} [alias] - topic alias
 * @returns {Boolean} - if success return true otherwise false
 */
TopicAliasRecv.prototype.put = function (topic, alias) {
  if (alias === 0 || alias > this.max) {
    return false
  }
  this.aliasToTopic[alias] = topic
  this.length = Object.keys(this.aliasToTopic).length
  return true
}

/**
 * Get topic by alias
 * @param {String} [topic] - topic
 * @returns {Number} - if mapped topic exists return topic alias, otherwise return undefined
 */
TopicAliasRecv.prototype.getTopicByAlias = function (alias) {
  return this.aliasToTopic[alias]
}

/**
 * Clear all entries
 */
TopicAliasRecv.prototype.clear = function () {
  this.aliasToTopic = {}
}

module.exports = TopicAliasRecv

},{}],10:[function(require,module,exports){
'use strict'

/**
 * Module dependencies
 */
const LruMap = require('lru-cache')
const NumberAllocator = require('number-allocator').NumberAllocator

/**
 * Topic Alias sending manager
 * This holds both topic to alias and alias to topic map
 * @param {Number} [max] - topic alias maximum entries
 */
function TopicAliasSend (max) {
  if (!(this instanceof TopicAliasSend)) {
    return new TopicAliasSend(max)
  }

  if (max > 0) {
    this.aliasToTopic = new LruMap({ max: max })
    this.topicToAlias = {}
    this.numberAllocator = new NumberAllocator(1, max)
    this.max = max
    this.length = 0
  }
}

/**
 * Insert or update topic - alias entry.
 * @param {String} [topic] - topic
 * @param {Number} [alias] - topic alias
 * @returns {Boolean} - if success return true otherwise false
 */
TopicAliasSend.prototype.put = function (topic, alias) {
  if (alias === 0 || alias > this.max) {
    return false
  }
  const entry = this.aliasToTopic.get(alias)
  if (entry) {
    delete this.topicToAlias[entry]
  }
  this.aliasToTopic.set(alias, topic)
  this.topicToAlias[topic] = alias
  this.numberAllocator.use(alias)
  this.length = this.aliasToTopic.length
  return true
}

/**
 * Get topic by alias
 * @param {Number} [alias] - topic alias
 * @returns {String} - if mapped topic exists return topic, otherwise return undefined
 */
TopicAliasSend.prototype.getTopicByAlias = function (alias) {
  return this.aliasToTopic.get(alias)
}

/**
 * Get topic by alias
 * @param {String} [topic] - topic
 * @returns {Number} - if mapped topic exists return topic alias, otherwise return undefined
 */
TopicAliasSend.prototype.getAliasByTopic = function (topic) {
  const alias = this.topicToAlias[topic]
  if (typeof alias !== 'undefined') {
    this.aliasToTopic.get(alias) // LRU update
  }
  return alias
}

/**
 * Clear all entries
 */
TopicAliasSend.prototype.clear = function () {
  this.aliasToTopic.reset()
  this.topicToAlias = {}
  this.numberAllocator.clear()
  this.length = 0
}

/**
 * Get Least Recently Used (LRU) topic alias
 * @returns {Number} - if vacant alias exists then return it, otherwise then return LRU alias
 */
TopicAliasSend.prototype.getLruAlias = function () {
  const alias = this.numberAllocator.firstVacant()
  if (alias) return alias
  return this.aliasToTopic.keys()[this.aliasToTopic.length - 1]
}

module.exports = TopicAliasSend

},{"lru-cache":37,"number-allocator":46}],11:[function(require,module,exports){
'use strict'

/**
 * Validate a topic to see if it's valid or not.
 * A topic is valid if it follow below rules:
 * - Rule #1: If any part of the topic is not `+` or `#`, then it must not contain `+` and '#'
 * - Rule #2: Part `#` must be located at the end of the mailbox
 *
 * @param {String} topic - A topic
 * @returns {Boolean} If the topic is valid, returns true. Otherwise, returns false.
 */
function validateTopic (topic) {
  const parts = topic.split('/')

  for (let i = 0; i < parts.length; i++) {
    if (parts[i] === '+') {
      continue
    }

    if (parts[i] === '#') {
      // for Rule #2
      return i === parts.length - 1
    }

    if (parts[i].indexOf('+') !== -1 || parts[i].indexOf('#') !== -1) {
      return false
    }
  }

  return true
}

/**
 * Validate an array of topics to see if any of them is valid or not
  * @param {Array} topics - Array of topics
 * @returns {String} If the topics is valid, returns null. Otherwise, returns the invalid one
 */
function validateTopics (topics) {
  if (topics.length === 0) {
    return 'empty_topic_list'
  }
  for (let i = 0; i < topics.length; i++) {
    if (!validateTopic(topics[i])) {
      return topics[i]
    }
  }
  return null
}

module.exports = {
  validateTopics: validateTopics
}

},{}],12:[function(require,module,exports){
(function (process){(function (){
'use strict'

const MqttClient = require('../client')
const Store = require('../store')
const url = require('url')
const xtend = require('xtend')
const debug = require('debug')('mqttjs')

const protocols = {}

// eslint-disable-next-line camelcase
if ((typeof process !== 'undefined' && process.title !== 'browser') || typeof __webpack_require__ !== 'function') {
  protocols.mqtt = require('./tcp')
  protocols.tcp = require('./tcp')
  protocols.ssl = require('./tls')
  protocols.tls = require('./tls')
  protocols.mqtts = require('./tls')
} else {
  protocols.wx = require('./wx')
  protocols.wxs = require('./wx')

  protocols.ali = require('./ali')
  protocols.alis = require('./ali')
}

protocols.ws = require('./ws')
protocols.wss = require('./ws')

/**
 * Parse the auth attribute and merge username and password in the options object.
 *
 * @param {Object} [opts] option object
 */
function parseAuthOptions (opts) {
  let matches
  if (opts.auth) {
    matches = opts.auth.match(/^(.+):(.+)$/)
    if (matches) {
      opts.username = matches[1]
      opts.password = matches[2]
    } else {
      opts.username = opts.auth
    }
  }
}

/**
 * connect - connect to an MQTT broker.
 *
 * @param {String} [brokerUrl] - url of the broker, optional
 * @param {Object} opts - see MqttClient#constructor
 */
function connect (brokerUrl, opts) {
  debug('connecting to an MQTT broker...')
  if ((typeof brokerUrl === 'object') && !opts) {
    opts = brokerUrl
    brokerUrl = null
  }

  opts = opts || {}

  if (brokerUrl) {
    // eslint-disable-next-line
    const parsed = url.parse(brokerUrl, true)
    if (parsed.port != null) {
      parsed.port = Number(parsed.port)
    }

    opts = xtend(parsed, opts)

    if (opts.protocol === null) {
      throw new Error('Missing protocol')
    }

    opts.protocol = opts.protocol.replace(/:$/, '')
  }

  // merge in the auth options if supplied
  parseAuthOptions(opts)

  // support clientId passed in the query string of the url
  if (opts.query && typeof opts.query.clientId === 'string') {
    opts.clientId = opts.query.clientId
  }

  if (opts.cert && opts.key) {
    if (opts.protocol) {
      if (['mqtts', 'wss', 'wxs', 'alis'].indexOf(opts.protocol) === -1) {
        switch (opts.protocol) {
          case 'mqtt':
            opts.protocol = 'mqtts'
            break
          case 'ws':
            opts.protocol = 'wss'
            break
          case 'wx':
            opts.protocol = 'wxs'
            break
          case 'ali':
            opts.protocol = 'alis'
            break
          default:
            throw new Error('Unknown protocol for secure connection: "' + opts.protocol + '"!')
        }
      }
    } else {
      // A cert and key was provided, however no protocol was specified, so we will throw an error.
      throw new Error('Missing secure protocol key')
    }
  }

  if (!protocols[opts.protocol]) {
    const isSecure = ['mqtts', 'wss'].indexOf(opts.protocol) !== -1
    opts.protocol = [
      'mqtt',
      'mqtts',
      'ws',
      'wss',
      'wx',
      'wxs',
      'ali',
      'alis'
    ].filter(function (key, index) {
      if (isSecure && index % 2 === 0) {
        // Skip insecure protocols when requesting a secure one.
        return false
      }
      return (typeof protocols[key] === 'function')
    })[0]
  }

  if (opts.clean === false && !opts.clientId) {
    throw new Error('Missing clientId for unclean clients')
  }

  if (opts.protocol) {
    opts.defaultProtocol = opts.protocol
  }

  function wrapper (client) {
    if (opts.servers) {
      if (!client._reconnectCount || client._reconnectCount === opts.servers.length) {
        client._reconnectCount = 0
      }

      opts.host = opts.servers[client._reconnectCount].host
      opts.port = opts.servers[client._reconnectCount].port
      opts.protocol = (!opts.servers[client._reconnectCount].protocol ? opts.defaultProtocol : opts.servers[client._reconnectCount].protocol)
      opts.hostname = opts.host

      client._reconnectCount++
    }

    debug('calling streambuilder for', opts.protocol)
    return protocols[opts.protocol](client, opts)
  }
  const client = new MqttClient(wrapper, opts)
  client.on('error', function () { /* Automatically set up client error handling */ })
  return client
}

module.exports = connect
module.exports.connect = connect
module.exports.MqttClient = MqttClient
module.exports.Store = Store

}).call(this)}).call(this,require('_process'))
},{"../client":1,"../store":8,"./ali":2,"./tcp":3,"./tls":4,"./ws":5,"./wx":6,"_process":50,"debug":18,"url":76,"xtend":81}],13:[function(require,module,exports){
'use strict'

exports.byteLength = byteLength
exports.toByteArray = toByteArray
exports.fromByteArray = fromByteArray

var lookup = []
var revLookup = []
var Arr = typeof Uint8Array !== 'undefined' ? Uint8Array : Array

var code = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
for (var i = 0, len = code.length; i < len; ++i) {
  lookup[i] = code[i]
  revLookup[code.charCodeAt(i)] = i
}

// Support decoding URL-safe base64 strings, as Node.js does.
// See: https://en.wikipedia.org/wiki/Base64#URL_applications
revLookup['-'.charCodeAt(0)] = 62
revLookup['_'.charCodeAt(0)] = 63

function getLens (b64) {
  var len = b64.length

  if (len % 4 > 0) {
    throw new Error('Invalid string. Length must be a multiple of 4')
  }

  // Trim off extra bytes after placeholder bytes are found
  // See: https://github.com/beatgammit/base64-js/issues/42
  var validLen = b64.indexOf('=')
  if (validLen === -1) validLen = len

  var placeHoldersLen = validLen === len
    ? 0
    : 4 - (validLen % 4)

  return [validLen, placeHoldersLen]
}

// base64 is 4/3 + up to two characters of the original data
function byteLength (b64) {
  var lens = getLens(b64)
  var validLen = lens[0]
  var placeHoldersLen = lens[1]
  return ((validLen + placeHoldersLen) * 3 / 4) - placeHoldersLen
}

function _byteLength (b64, validLen, placeHoldersLen) {
  return ((validLen + placeHoldersLen) * 3 / 4) - placeHoldersLen
}

function toByteArray (b64) {
  var tmp
  var lens = getLens(b64)
  var validLen = lens[0]
  var placeHoldersLen = lens[1]

  var arr = new Arr(_byteLength(b64, validLen, placeHoldersLen))

  var curByte = 0

  // if there are placeholders, only get up to the last complete 4 chars
  var len = placeHoldersLen > 0
    ? validLen - 4
    : validLen

  var i
  for (i = 0; i < len; i += 4) {
    tmp =
      (revLookup[b64.charCodeAt(i)] << 18) |
      (revLookup[b64.charCodeAt(i + 1)] << 12) |
      (revLookup[b64.charCodeAt(i + 2)] << 6) |
      revLookup[b64.charCodeAt(i + 3)]
    arr[curByte++] = (tmp >> 16) & 0xFF
    arr[curByte++] = (tmp >> 8) & 0xFF
    arr[curByte++] = tmp & 0xFF
  }

  if (placeHoldersLen === 2) {
    tmp =
      (revLookup[b64.charCodeAt(i)] << 2) |
      (revLookup[b64.charCodeAt(i + 1)] >> 4)
    arr[curByte++] = tmp & 0xFF
  }

  if (placeHoldersLen === 1) {
    tmp =
      (revLookup[b64.charCodeAt(i)] << 10) |
      (revLookup[b64.charCodeAt(i + 1)] << 4) |
      (revLookup[b64.charCodeAt(i + 2)] >> 2)
    arr[curByte++] = (tmp >> 8) & 0xFF
    arr[curByte++] = tmp & 0xFF
  }

  return arr
}

function tripletToBase64 (num) {
  return lookup[num >> 18 & 0x3F] +
    lookup[num >> 12 & 0x3F] +
    lookup[num >> 6 & 0x3F] +
    lookup[num & 0x3F]
}

function encodeChunk (uint8, start, end) {
  var tmp
  var output = []
  for (var i = start; i < end; i += 3) {
    tmp =
      ((uint8[i] << 16) & 0xFF0000) +
      ((uint8[i + 1] << 8) & 0xFF00) +
      (uint8[i + 2] & 0xFF)
    output.push(tripletToBase64(tmp))
  }
  return output.join('')
}

function fromByteArray (uint8) {
  var tmp
  var len = uint8.length
  var extraBytes = len % 3 // if we have 1 byte left, pad 2 bytes
  var parts = []
  var maxChunkLength = 16383 // must be multiple of 3

  // go through the array every three bytes, we'll deal with trailing stuff later
  for (var i = 0, len2 = len - extraBytes; i < len2; i += maxChunkLength) {
    parts.push(encodeChunk(uint8, i, (i + maxChunkLength) > len2 ? len2 : (i + maxChunkLength)))
  }

  // pad the end with zeros, but make sure to not forget the extra bytes
  if (extraBytes === 1) {
    tmp = uint8[len - 1]
    parts.push(
      lookup[tmp >> 2] +
      lookup[(tmp << 4) & 0x3F] +
      '=='
    )
  } else if (extraBytes === 2) {
    tmp = (uint8[len - 2] << 8) + uint8[len - 1]
    parts.push(
      lookup[tmp >> 10] +
      lookup[(tmp >> 4) & 0x3F] +
      lookup[(tmp << 2) & 0x3F] +
      '='
    )
  }

  return parts.join('')
}

},{}],14:[function(require,module,exports){
'use strict'

const { Buffer } = require('buffer')
const symbol = Symbol.for('BufferList')

function BufferList (buf) {
  if (!(this instanceof BufferList)) {
    return new BufferList(buf)
  }

  BufferList._init.call(this, buf)
}

BufferList._init = function _init (buf) {
  Object.defineProperty(this, symbol, { value: true })

  this._bufs = []
  this.length = 0

  if (buf) {
    this.append(buf)
  }
}

BufferList.prototype._new = function _new (buf) {
  return new BufferList(buf)
}

BufferList.prototype._offset = function _offset (offset) {
  if (offset === 0) {
    return [0, 0]
  }

  let tot = 0

  for (let i = 0; i < this._bufs.length; i++) {
    const _t = tot + this._bufs[i].length
    if (offset < _t || i === this._bufs.length - 1) {
      return [i, offset - tot]
    }
    tot = _t
  }
}

BufferList.prototype._reverseOffset = function (blOffset) {
  const bufferId = blOffset[0]
  let offset = blOffset[1]

  for (let i = 0; i < bufferId; i++) {
    offset += this._bufs[i].length
  }

  return offset
}

BufferList.prototype.get = function get (index) {
  if (index > this.length || index < 0) {
    return undefined
  }

  const offset = this._offset(index)

  return this._bufs[offset[0]][offset[1]]
}

BufferList.prototype.slice = function slice (start, end) {
  if (typeof start === 'number' && start < 0) {
    start += this.length
  }

  if (typeof end === 'number' && end < 0) {
    end += this.length
  }

  return this.copy(null, 0, start, end)
}

BufferList.prototype.copy = function copy (dst, dstStart, srcStart, srcEnd) {
  if (typeof srcStart !== 'number' || srcStart < 0) {
    srcStart = 0
  }

  if (typeof srcEnd !== 'number' || srcEnd > this.length) {
    srcEnd = this.length
  }

  if (srcStart >= this.length) {
    return dst || Buffer.alloc(0)
  }

  if (srcEnd <= 0) {
    return dst || Buffer.alloc(0)
  }

  const copy = !!dst
  const off = this._offset(srcStart)
  const len = srcEnd - srcStart
  let bytes = len
  let bufoff = (copy && dstStart) || 0
  let start = off[1]

  // copy/slice everything
  if (srcStart === 0 && srcEnd === this.length) {
    if (!copy) {
      // slice, but full concat if multiple buffers
      return this._bufs.length === 1
        ? this._bufs[0]
        : Buffer.concat(this._bufs, this.length)
    }

    // copy, need to copy individual buffers
    for (let i = 0; i < this._bufs.length; i++) {
      this._bufs[i].copy(dst, bufoff)
      bufoff += this._bufs[i].length
    }

    return dst
  }

  // easy, cheap case where it's a subset of one of the buffers
  if (bytes <= this._bufs[off[0]].length - start) {
    return copy
      ? this._bufs[off[0]].copy(dst, dstStart, start, start + bytes)
      : this._bufs[off[0]].slice(start, start + bytes)
  }

  if (!copy) {
    // a slice, we need something to copy in to
    dst = Buffer.allocUnsafe(len)
  }

  for (let i = off[0]; i < this._bufs.length; i++) {
    const l = this._bufs[i].length - start

    if (bytes > l) {
      this._bufs[i].copy(dst, bufoff, start)
      bufoff += l
    } else {
      this._bufs[i].copy(dst, bufoff, start, start + bytes)
      bufoff += l
      break
    }

    bytes -= l

    if (start) {
      start = 0
    }
  }

  // safeguard so that we don't return uninitialized memory
  if (dst.length > bufoff) return dst.slice(0, bufoff)

  return dst
}

BufferList.prototype.shallowSlice = function shallowSlice (start, end) {
  start = start || 0
  end = typeof end !== 'number' ? this.length : end

  if (start < 0) {
    start += this.length
  }

  if (end < 0) {
    end += this.length
  }

  if (start === end) {
    return this._new()
  }

  const startOffset = this._offset(start)
  const endOffset = this._offset(end)
  const buffers = this._bufs.slice(startOffset[0], endOffset[0] + 1)

  if (endOffset[1] === 0) {
    buffers.pop()
  } else {
    buffers[buffers.length - 1] = buffers[buffers.length - 1].slice(0, endOffset[1])
  }

  if (startOffset[1] !== 0) {
    buffers[0] = buffers[0].slice(startOffset[1])
  }

  return this._new(buffers)
}

BufferList.prototype.toString = function toString (encoding, start, end) {
  return this.slice(start, end).toString(encoding)
}

BufferList.prototype.consume = function consume (bytes) {
  // first, normalize the argument, in accordance with how Buffer does it
  bytes = Math.trunc(bytes)
  // do nothing if not a positive number
  if (Number.isNaN(bytes) || bytes <= 0) return this

  while (this._bufs.length) {
    if (bytes >= this._bufs[0].length) {
      bytes -= this._bufs[0].length
      this.length -= this._bufs[0].length
      this._bufs.shift()
    } else {
      this._bufs[0] = this._bufs[0].slice(bytes)
      this.length -= bytes
      break
    }
  }

  return this
}

BufferList.prototype.duplicate = function duplicate () {
  const copy = this._new()

  for (let i = 0; i < this._bufs.length; i++) {
    copy.append(this._bufs[i])
  }

  return copy
}

BufferList.prototype.append = function append (buf) {
  if (buf == null) {
    return this
  }

  if (buf.buffer) {
    // append a view of the underlying ArrayBuffer
    this._appendBuffer(Buffer.from(buf.buffer, buf.byteOffset, buf.byteLength))
  } else if (Array.isArray(buf)) {
    for (let i = 0; i < buf.length; i++) {
      this.append(buf[i])
    }
  } else if (this._isBufferList(buf)) {
    // unwrap argument into individual BufferLists
    for (let i = 0; i < buf._bufs.length; i++) {
      this.append(buf._bufs[i])
    }
  } else {
    // coerce number arguments to strings, since Buffer(number) does
    // uninitialized memory allocation
    if (typeof buf === 'number') {
      buf = buf.toString()
    }

    this._appendBuffer(Buffer.from(buf))
  }

  return this
}

BufferList.prototype._appendBuffer = function appendBuffer (buf) {
  this._bufs.push(buf)
  this.length += buf.length
}

BufferList.prototype.indexOf = function (search, offset, encoding) {
  if (encoding === undefined && typeof offset === 'string') {
    encoding = offset
    offset = undefined
  }

  if (typeof search === 'function' || Array.isArray(search)) {
    throw new TypeError('The "value" argument must be one of type string, Buffer, BufferList, or Uint8Array.')
  } else if (typeof search === 'number') {
    search = Buffer.from([search])
  } else if (typeof search === 'string') {
    search = Buffer.from(search, encoding)
  } else if (this._isBufferList(search)) {
    search = search.slice()
  } else if (Array.isArray(search.buffer)) {
    search = Buffer.from(search.buffer, search.byteOffset, search.byteLength)
  } else if (!Buffer.isBuffer(search)) {
    search = Buffer.from(search)
  }

  offset = Number(offset || 0)

  if (isNaN(offset)) {
    offset = 0
  }

  if (offset < 0) {
    offset = this.length + offset
  }

  if (offset < 0) {
    offset = 0
  }

  if (search.length === 0) {
    return offset > this.length ? this.length : offset
  }

  const blOffset = this._offset(offset)
  let blIndex = blOffset[0] // index of which internal buffer we're working on
  let buffOffset = blOffset[1] // offset of the internal buffer we're working on

  // scan over each buffer
  for (; blIndex < this._bufs.length; blIndex++) {
    const buff = this._bufs[blIndex]

    while (buffOffset < buff.length) {
      const availableWindow = buff.length - buffOffset

      if (availableWindow >= search.length) {
        const nativeSearchResult = buff.indexOf(search, buffOffset)

        if (nativeSearchResult !== -1) {
          return this._reverseOffset([blIndex, nativeSearchResult])
        }

        buffOffset = buff.length - search.length + 1 // end of native search window
      } else {
        const revOffset = this._reverseOffset([blIndex, buffOffset])

        if (this._match(revOffset, search)) {
          return revOffset
        }

        buffOffset++
      }
    }

    buffOffset = 0
  }

  return -1
}

BufferList.prototype._match = function (offset, search) {
  if (this.length - offset < search.length) {
    return false
  }

  for (let searchOffset = 0; searchOffset < search.length; searchOffset++) {
    if (this.get(offset + searchOffset) !== search[searchOffset]) {
      return false
    }
  }
  return true
}

;(function () {
  const methods = {
    readDoubleBE: 8,
    readDoubleLE: 8,
    readFloatBE: 4,
    readFloatLE: 4,
    readInt32BE: 4,
    readInt32LE: 4,
    readUInt32BE: 4,
    readUInt32LE: 4,
    readInt16BE: 2,
    readInt16LE: 2,
    readUInt16BE: 2,
    readUInt16LE: 2,
    readInt8: 1,
    readUInt8: 1,
    readIntBE: null,
    readIntLE: null,
    readUIntBE: null,
    readUIntLE: null
  }

  for (const m in methods) {
    (function (m) {
      if (methods[m] === null) {
        BufferList.prototype[m] = function (offset, byteLength) {
          return this.slice(offset, offset + byteLength)[m](0, byteLength)
        }
      } else {
        BufferList.prototype[m] = function (offset = 0) {
          return this.slice(offset, offset + methods[m])[m](0)
        }
      }
    }(m))
  }
}())

// Used internally by the class and also as an indicator of this object being
// a `BufferList`. It's not possible to use `instanceof BufferList` in a browser
// environment because there could be multiple different copies of the
// BufferList class and some `BufferList`s might be `BufferList`s.
BufferList.prototype._isBufferList = function _isBufferList (b) {
  return b instanceof BufferList || BufferList.isBufferList(b)
}

BufferList.isBufferList = function isBufferList (b) {
  return b != null && b[symbol]
}

module.exports = BufferList

},{"buffer":17}],15:[function(require,module,exports){
'use strict'

const DuplexStream = require('readable-stream').Duplex
const inherits = require('inherits')
const BufferList = require('./BufferList')

function BufferListStream (callback) {
  if (!(this instanceof BufferListStream)) {
    return new BufferListStream(callback)
  }

  if (typeof callback === 'function') {
    this._callback = callback

    const piper = function piper (err) {
      if (this._callback) {
        this._callback(err)
        this._callback = null
      }
    }.bind(this)

    this.on('pipe', function onPipe (src) {
      src.on('error', piper)
    })
    this.on('unpipe', function onUnpipe (src) {
      src.removeListener('error', piper)
    })

    callback = null
  }

  BufferList._init.call(this, callback)
  DuplexStream.call(this)
}

inherits(BufferListStream, DuplexStream)
Object.assign(BufferListStream.prototype, BufferList.prototype)

BufferListStream.prototype._new = function _new (callback) {
  return new BufferListStream(callback)
}

BufferListStream.prototype._write = function _write (buf, encoding, callback) {
  this._appendBuffer(buf)

  if (typeof callback === 'function') {
    callback()
  }
}

BufferListStream.prototype._read = function _read (size) {
  if (!this.length) {
    return this.push(null)
  }

  size = Math.min(size, this.length)
  this.push(this.slice(0, size))
  this.consume(size)
}

BufferListStream.prototype.end = function end (chunk) {
  DuplexStream.prototype.end.call(this, chunk)

  if (this._callback) {
    this._callback(null, this.slice())
    this._callback = null
  }
}

BufferListStream.prototype._destroy = function _destroy (err, cb) {
  this._bufs.length = 0
  this.length = 0
  cb(err)
}

BufferListStream.prototype._isBufferList = function _isBufferList (b) {
  return b instanceof BufferListStream || b instanceof BufferList || BufferListStream.isBufferList(b)
}

BufferListStream.isBufferList = BufferList.isBufferList

module.exports = BufferListStream
module.exports.BufferListStream = BufferListStream
module.exports.BufferList = BufferList

},{"./BufferList":14,"inherits":24,"readable-stream":69}],16:[function(require,module,exports){

},{}],17:[function(require,module,exports){
(function (Buffer){(function (){
/*!
 * The buffer module from node.js, for the browser.
 *
 * @author   Feross Aboukhadijeh <https://feross.org>
 * @license  MIT
 */
/* eslint-disable no-proto */

'use strict'

var base64 = require('base64-js')
var ieee754 = require('ieee754')

exports.Buffer = Buffer
exports.SlowBuffer = SlowBuffer
exports.INSPECT_MAX_BYTES = 50

var K_MAX_LENGTH = 0x7fffffff
exports.kMaxLength = K_MAX_LENGTH

/**
 * If `Buffer.TYPED_ARRAY_SUPPORT`:
 *   === true    Use Uint8Array implementation (fastest)
 *   === false   Print warning and recommend using `buffer` v4.x which has an Object
 *               implementation (most compatible, even IE6)
 *
 * Browsers that support typed arrays are IE 10+, Firefox 4+, Chrome 7+, Safari 5.1+,
 * Opera 11.6+, iOS 4.2+.
 *
 * We report that the browser does not support typed arrays if the are not subclassable
 * using __proto__. Firefox 4-29 lacks support for adding new properties to `Uint8Array`
 * (See: https://bugzilla.mozilla.org/show_bug.cgi?id=695438). IE 10 lacks support
 * for __proto__ and has a buggy typed array implementation.
 */
Buffer.TYPED_ARRAY_SUPPORT = typedArraySupport()

if (!Buffer.TYPED_ARRAY_SUPPORT && typeof console !== 'undefined' &&
    typeof console.error === 'function') {
  console.error(
    'This browser lacks typed array (Uint8Array) support which is required by ' +
    '`buffer` v5.x. Use `buffer` v4.x if you require old browser support.'
  )
}

function typedArraySupport () {
  // Can typed array instances can be augmented?
  try {
    var arr = new Uint8Array(1)
    arr.__proto__ = { __proto__: Uint8Array.prototype, foo: function () { return 42 } }
    return arr.foo() === 42
  } catch (e) {
    return false
  }
}

Object.defineProperty(Buffer.prototype, 'parent', {
  enumerable: true,
  get: function () {
    if (!Buffer.isBuffer(this)) return undefined
    return this.buffer
  }
})

Object.defineProperty(Buffer.prototype, 'offset', {
  enumerable: true,
  get: function () {
    if (!Buffer.isBuffer(this)) return undefined
    return this.byteOffset
  }
})

function createBuffer (length) {
  if (length > K_MAX_LENGTH) {
    throw new RangeError('The value "' + length + '" is invalid for option "size"')
  }
  // Return an augmented `Uint8Array` instance
  var buf = new Uint8Array(length)
  buf.__proto__ = Buffer.prototype
  return buf
}

/**
 * The Buffer constructor returns instances of `Uint8Array` that have their
 * prototype changed to `Buffer.prototype`. Furthermore, `Buffer` is a subclass of
 * `Uint8Array`, so the returned instances will have all the node `Buffer` methods
 * and the `Uint8Array` methods. Square bracket notation works as expected -- it
 * returns a single octet.
 *
 * The `Uint8Array` prototype remains unmodified.
 */

function Buffer (arg, encodingOrOffset, length) {
  // Common case.
  if (typeof arg === 'number') {
    if (typeof encodingOrOffset === 'string') {
      throw new TypeError(
        'The "string" argument must be of type string. Received type number'
      )
    }
    return allocUnsafe(arg)
  }
  return from(arg, encodingOrOffset, length)
}

// Fix subarray() in ES2016. See: https://github.com/feross/buffer/pull/97
if (typeof Symbol !== 'undefined' && Symbol.species != null &&
    Buffer[Symbol.species] === Buffer) {
  Object.defineProperty(Buffer, Symbol.species, {
    value: null,
    configurable: true,
    enumerable: false,
    writable: false
  })
}

Buffer.poolSize = 8192 // not used by this implementation

function from (value, encodingOrOffset, length) {
  if (typeof value === 'string') {
    return fromString(value, encodingOrOffset)
  }

  if (ArrayBuffer.isView(value)) {
    return fromArrayLike(value)
  }

  if (value == null) {
    throw TypeError(
      'The first argument must be one of type string, Buffer, ArrayBuffer, Array, ' +
      'or Array-like Object. Received type ' + (typeof value)
    )
  }

  if (isInstance(value, ArrayBuffer) ||
      (value && isInstance(value.buffer, ArrayBuffer))) {
    return fromArrayBuffer(value, encodingOrOffset, length)
  }

  if (typeof value === 'number') {
    throw new TypeError(
      'The "value" argument must not be of type number. Received type number'
    )
  }

  var valueOf = value.valueOf && value.valueOf()
  if (valueOf != null && valueOf !== value) {
    return Buffer.from(valueOf, encodingOrOffset, length)
  }

  var b = fromObject(value)
  if (b) return b

  if (typeof Symbol !== 'undefined' && Symbol.toPrimitive != null &&
      typeof value[Symbol.toPrimitive] === 'function') {
    return Buffer.from(
      value[Symbol.toPrimitive]('string'), encodingOrOffset, length
    )
  }

  throw new TypeError(
    'The first argument must be one of type string, Buffer, ArrayBuffer, Array, ' +
    'or Array-like Object. Received type ' + (typeof value)
  )
}

/**
 * Functionally equivalent to Buffer(arg, encoding) but throws a TypeError
 * if value is a number.
 * Buffer.from(str[, encoding])
 * Buffer.from(array)
 * Buffer.from(buffer)
 * Buffer.from(arrayBuffer[, byteOffset[, length]])
 **/
Buffer.from = function (value, encodingOrOffset, length) {
  return from(value, encodingOrOffset, length)
}

// Note: Change prototype *after* Buffer.from is defined to workaround Chrome bug:
// https://github.com/feross/buffer/pull/148
Buffer.prototype.__proto__ = Uint8Array.prototype
Buffer.__proto__ = Uint8Array

function assertSize (size) {
  if (typeof size !== 'number') {
    throw new TypeError('"size" argument must be of type number')
  } else if (size < 0) {
    throw new RangeError('The value "' + size + '" is invalid for option "size"')
  }
}

function alloc (size, fill, encoding) {
  assertSize(size)
  if (size <= 0) {
    return createBuffer(size)
  }
  if (fill !== undefined) {
    // Only pay attention to encoding if it's a string. This
    // prevents accidentally sending in a number that would
    // be interpretted as a start offset.
    return typeof encoding === 'string'
      ? createBuffer(size).fill(fill, encoding)
      : createBuffer(size).fill(fill)
  }
  return createBuffer(size)
}

/**
 * Creates a new filled Buffer instance.
 * alloc(size[, fill[, encoding]])
 **/
Buffer.alloc = function (size, fill, encoding) {
  return alloc(size, fill, encoding)
}

function allocUnsafe (size) {
  assertSize(size)
  return createBuffer(size < 0 ? 0 : checked(size) | 0)
}

/**
 * Equivalent to Buffer(num), by default creates a non-zero-filled Buffer instance.
 * */
Buffer.allocUnsafe = function (size) {
  return allocUnsafe(size)
}
/**
 * Equivalent to SlowBuffer(num), by default creates a non-zero-filled Buffer instance.
 */
Buffer.allocUnsafeSlow = function (size) {
  return allocUnsafe(size)
}

function fromString (string, encoding) {
  if (typeof encoding !== 'string' || encoding === '') {
    encoding = 'utf8'
  }

  if (!Buffer.isEncoding(encoding)) {
    throw new TypeError('Unknown encoding: ' + encoding)
  }

  var length = byteLength(string, encoding) | 0
  var buf = createBuffer(length)

  var actual = buf.write(string, encoding)

  if (actual !== length) {
    // Writing a hex string, for example, that contains invalid characters will
    // cause everything after the first invalid character to be ignored. (e.g.
    // 'abxxcd' will be treated as 'ab')
    buf = buf.slice(0, actual)
  }

  return buf
}

function fromArrayLike (array) {
  var length = array.length < 0 ? 0 : checked(array.length) | 0
  var buf = createBuffer(length)
  for (var i = 0; i < length; i += 1) {
    buf[i] = array[i] & 255
  }
  return buf
}

function fromArrayBuffer (array, byteOffset, length) {
  if (byteOffset < 0 || array.byteLength < byteOffset) {
    throw new RangeError('"offset" is outside of buffer bounds')
  }

  if (array.byteLength < byteOffset + (length || 0)) {
    throw new RangeError('"length" is outside of buffer bounds')
  }

  var buf
  if (byteOffset === undefined && length === undefined) {
    buf = new Uint8Array(array)
  } else if (length === undefined) {
    buf = new Uint8Array(array, byteOffset)
  } else {
    buf = new Uint8Array(array, byteOffset, length)
  }

  // Return an augmented `Uint8Array` instance
  buf.__proto__ = Buffer.prototype
  return buf
}

function fromObject (obj) {
  if (Buffer.isBuffer(obj)) {
    var len = checked(obj.length) | 0
    var buf = createBuffer(len)

    if (buf.length === 0) {
      return buf
    }

    obj.copy(buf, 0, 0, len)
    return buf
  }

  if (obj.length !== undefined) {
    if (typeof obj.length !== 'number' || numberIsNaN(obj.length)) {
      return createBuffer(0)
    }
    return fromArrayLike(obj)
  }

  if (obj.type === 'Buffer' && Array.isArray(obj.data)) {
    return fromArrayLike(obj.data)
  }
}

function checked (length) {
  // Note: cannot use `length < K_MAX_LENGTH` here because that fails when
  // length is NaN (which is otherwise coerced to zero.)
  if (length >= K_MAX_LENGTH) {
    throw new RangeError('Attempt to allocate Buffer larger than maximum ' +
                         'size: 0x' + K_MAX_LENGTH.toString(16) + ' bytes')
  }
  return length | 0
}

function SlowBuffer (length) {
  if (+length != length) { // eslint-disable-line eqeqeq
    length = 0
  }
  return Buffer.alloc(+length)
}

Buffer.isBuffer = function isBuffer (b) {
  return b != null && b._isBuffer === true &&
    b !== Buffer.prototype // so Buffer.isBuffer(Buffer.prototype) will be false
}

Buffer.compare = function compare (a, b) {
  if (isInstance(a, Uint8Array)) a = Buffer.from(a, a.offset, a.byteLength)
  if (isInstance(b, Uint8Array)) b = Buffer.from(b, b.offset, b.byteLength)
  if (!Buffer.isBuffer(a) || !Buffer.isBuffer(b)) {
    throw new TypeError(
      'The "buf1", "buf2" arguments must be one of type Buffer or Uint8Array'
    )
  }

  if (a === b) return 0

  var x = a.length
  var y = b.length

  for (var i = 0, len = Math.min(x, y); i < len; ++i) {
    if (a[i] !== b[i]) {
      x = a[i]
      y = b[i]
      break
    }
  }

  if (x < y) return -1
  if (y < x) return 1
  return 0
}

Buffer.isEncoding = function isEncoding (encoding) {
  switch (String(encoding).toLowerCase()) {
    case 'hex':
    case 'utf8':
    case 'utf-8':
    case 'ascii':
    case 'latin1':
    case 'binary':
    case 'base64':
    case 'ucs2':
    case 'ucs-2':
    case 'utf16le':
    case 'utf-16le':
      return true
    default:
      return false
  }
}

Buffer.concat = function concat (list, length) {
  if (!Array.isArray(list)) {
    throw new TypeError('"list" argument must be an Array of Buffers')
  }

  if (list.length === 0) {
    return Buffer.alloc(0)
  }

  var i
  if (length === undefined) {
    length = 0
    for (i = 0; i < list.length; ++i) {
      length += list[i].length
    }
  }

  var buffer = Buffer.allocUnsafe(length)
  var pos = 0
  for (i = 0; i < list.length; ++i) {
    var buf = list[i]
    if (isInstance(buf, Uint8Array)) {
      buf = Buffer.from(buf)
    }
    if (!Buffer.isBuffer(buf)) {
      throw new TypeError('"list" argument must be an Array of Buffers')
    }
    buf.copy(buffer, pos)
    pos += buf.length
  }
  return buffer
}

function byteLength (string, encoding) {
  if (Buffer.isBuffer(string)) {
    return string.length
  }
  if (ArrayBuffer.isView(string) || isInstance(string, ArrayBuffer)) {
    return string.byteLength
  }
  if (typeof string !== 'string') {
    throw new TypeError(
      'The "string" argument must be one of type string, Buffer, or ArrayBuffer. ' +
      'Received type ' + typeof string
    )
  }

  var len = string.length
  var mustMatch = (arguments.length > 2 && arguments[2] === true)
  if (!mustMatch && len === 0) return 0

  // Use a for loop to avoid recursion
  var loweredCase = false
  for (;;) {
    switch (encoding) {
      case 'ascii':
      case 'latin1':
      case 'binary':
        return len
      case 'utf8':
      case 'utf-8':
        return utf8ToBytes(string).length
      case 'ucs2':
      case 'ucs-2':
      case 'utf16le':
      case 'utf-16le':
        return len * 2
      case 'hex':
        return len >>> 1
      case 'base64':
        return base64ToBytes(string).length
      default:
        if (loweredCase) {
          return mustMatch ? -1 : utf8ToBytes(string).length // assume utf8
        }
        encoding = ('' + encoding).toLowerCase()
        loweredCase = true
    }
  }
}
Buffer.byteLength = byteLength

function slowToString (encoding, start, end) {
  var loweredCase = false

  // No need to verify that "this.length <= MAX_UINT32" since it's a read-only
  // property of a typed array.

  // This behaves neither like String nor Uint8Array in that we set start/end
  // to their upper/lower bounds if the value passed is out of range.
  // undefined is handled specially as per ECMA-262 6th Edition,
  // Section 13.3.3.7 Runtime Semantics: KeyedBindingInitialization.
  if (start === undefined || start < 0) {
    start = 0
  }
  // Return early if start > this.length. Done here to prevent potential uint32
  // coercion fail below.
  if (start > this.length) {
    return ''
  }

  if (end === undefined || end > this.length) {
    end = this.length
  }

  if (end <= 0) {
    return ''
  }

  // Force coersion to uint32. This will also coerce falsey/NaN values to 0.
  end >>>= 0
  start >>>= 0

  if (end <= start) {
    return ''
  }

  if (!encoding) encoding = 'utf8'

  while (true) {
    switch (encoding) {
      case 'hex':
        return hexSlice(this, start, end)

      case 'utf8':
      case 'utf-8':
        return utf8Slice(this, start, end)

      case 'ascii':
        return asciiSlice(this, start, end)

      case 'latin1':
      case 'binary':
        return latin1Slice(this, start, end)

      case 'base64':
        return base64Slice(this, start, end)

      case 'ucs2':
      case 'ucs-2':
      case 'utf16le':
      case 'utf-16le':
        return utf16leSlice(this, start, end)

      default:
        if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
        encoding = (encoding + '').toLowerCase()
        loweredCase = true
    }
  }
}

// This property is used by `Buffer.isBuffer` (and the `is-buffer` npm package)
// to detect a Buffer instance. It's not possible to use `instanceof Buffer`
// reliably in a browserify context because there could be multiple different
// copies of the 'buffer' package in use. This method works even for Buffer
// instances that were created from another copy of the `buffer` package.
// See: https://github.com/feross/buffer/issues/154
Buffer.prototype._isBuffer = true

function swap (b, n, m) {
  var i = b[n]
  b[n] = b[m]
  b[m] = i
}

Buffer.prototype.swap16 = function swap16 () {
  var len = this.length
  if (len % 2 !== 0) {
    throw new RangeError('Buffer size must be a multiple of 16-bits')
  }
  for (var i = 0; i < len; i += 2) {
    swap(this, i, i + 1)
  }
  return this
}

Buffer.prototype.swap32 = function swap32 () {
  var len = this.length
  if (len % 4 !== 0) {
    throw new RangeError('Buffer size must be a multiple of 32-bits')
  }
  for (var i = 0; i < len; i += 4) {
    swap(this, i, i + 3)
    swap(this, i + 1, i + 2)
  }
  return this
}

Buffer.prototype.swap64 = function swap64 () {
  var len = this.length
  if (len % 8 !== 0) {
    throw new RangeError('Buffer size must be a multiple of 64-bits')
  }
  for (var i = 0; i < len; i += 8) {
    swap(this, i, i + 7)
    swap(this, i + 1, i + 6)
    swap(this, i + 2, i + 5)
    swap(this, i + 3, i + 4)
  }
  return this
}

Buffer.prototype.toString = function toString () {
  var length = this.length
  if (length === 0) return ''
  if (arguments.length === 0) return utf8Slice(this, 0, length)
  return slowToString.apply(this, arguments)
}

Buffer.prototype.toLocaleString = Buffer.prototype.toString

Buffer.prototype.equals = function equals (b) {
  if (!Buffer.isBuffer(b)) throw new TypeError('Argument must be a Buffer')
  if (this === b) return true
  return Buffer.compare(this, b) === 0
}

Buffer.prototype.inspect = function inspect () {
  var str = ''
  var max = exports.INSPECT_MAX_BYTES
  str = this.toString('hex', 0, max).replace(/(.{2})/g, '$1 ').trim()
  if (this.length > max) str += ' ... '
  return '<Buffer ' + str + '>'
}

Buffer.prototype.compare = function compare (target, start, end, thisStart, thisEnd) {
  if (isInstance(target, Uint8Array)) {
    target = Buffer.from(target, target.offset, target.byteLength)
  }
  if (!Buffer.isBuffer(target)) {
    throw new TypeError(
      'The "target" argument must be one of type Buffer or Uint8Array. ' +
      'Received type ' + (typeof target)
    )
  }

  if (start === undefined) {
    start = 0
  }
  if (end === undefined) {
    end = target ? target.length : 0
  }
  if (thisStart === undefined) {
    thisStart = 0
  }
  if (thisEnd === undefined) {
    thisEnd = this.length
  }

  if (start < 0 || end > target.length || thisStart < 0 || thisEnd > this.length) {
    throw new RangeError('out of range index')
  }

  if (thisStart >= thisEnd && start >= end) {
    return 0
  }
  if (thisStart >= thisEnd) {
    return -1
  }
  if (start >= end) {
    return 1
  }

  start >>>= 0
  end >>>= 0
  thisStart >>>= 0
  thisEnd >>>= 0

  if (this === target) return 0

  var x = thisEnd - thisStart
  var y = end - start
  var len = Math.min(x, y)

  var thisCopy = this.slice(thisStart, thisEnd)
  var targetCopy = target.slice(start, end)

  for (var i = 0; i < len; ++i) {
    if (thisCopy[i] !== targetCopy[i]) {
      x = thisCopy[i]
      y = targetCopy[i]
      break
    }
  }

  if (x < y) return -1
  if (y < x) return 1
  return 0
}

// Finds either the first index of `val` in `buffer` at offset >= `byteOffset`,
// OR the last index of `val` in `buffer` at offset <= `byteOffset`.
//
// Arguments:
// - buffer - a Buffer to search
// - val - a string, Buffer, or number
// - byteOffset - an index into `buffer`; will be clamped to an int32
// - encoding - an optional encoding, relevant is val is a string
// - dir - true for indexOf, false for lastIndexOf
function bidirectionalIndexOf (buffer, val, byteOffset, encoding, dir) {
  // Empty buffer means no match
  if (buffer.length === 0) return -1

  // Normalize byteOffset
  if (typeof byteOffset === 'string') {
    encoding = byteOffset
    byteOffset = 0
  } else if (byteOffset > 0x7fffffff) {
    byteOffset = 0x7fffffff
  } else if (byteOffset < -0x80000000) {
    byteOffset = -0x80000000
  }
  byteOffset = +byteOffset // Coerce to Number.
  if (numberIsNaN(byteOffset)) {
    // byteOffset: it it's undefined, null, NaN, "foo", etc, search whole buffer
    byteOffset = dir ? 0 : (buffer.length - 1)
  }

  // Normalize byteOffset: negative offsets start from the end of the buffer
  if (byteOffset < 0) byteOffset = buffer.length + byteOffset
  if (byteOffset >= buffer.length) {
    if (dir) return -1
    else byteOffset = buffer.length - 1
  } else if (byteOffset < 0) {
    if (dir) byteOffset = 0
    else return -1
  }

  // Normalize val
  if (typeof val === 'string') {
    val = Buffer.from(val, encoding)
  }

  // Finally, search either indexOf (if dir is true) or lastIndexOf
  if (Buffer.isBuffer(val)) {
    // Special case: looking for empty string/buffer always fails
    if (val.length === 0) {
      return -1
    }
    return arrayIndexOf(buffer, val, byteOffset, encoding, dir)
  } else if (typeof val === 'number') {
    val = val & 0xFF // Search for a byte value [0-255]
    if (typeof Uint8Array.prototype.indexOf === 'function') {
      if (dir) {
        return Uint8Array.prototype.indexOf.call(buffer, val, byteOffset)
      } else {
        return Uint8Array.prototype.lastIndexOf.call(buffer, val, byteOffset)
      }
    }
    return arrayIndexOf(buffer, [ val ], byteOffset, encoding, dir)
  }

  throw new TypeError('val must be string, number or Buffer')
}

function arrayIndexOf (arr, val, byteOffset, encoding, dir) {
  var indexSize = 1
  var arrLength = arr.length
  var valLength = val.length

  if (encoding !== undefined) {
    encoding = String(encoding).toLowerCase()
    if (encoding === 'ucs2' || encoding === 'ucs-2' ||
        encoding === 'utf16le' || encoding === 'utf-16le') {
      if (arr.length < 2 || val.length < 2) {
        return -1
      }
      indexSize = 2
      arrLength /= 2
      valLength /= 2
      byteOffset /= 2
    }
  }

  function read (buf, i) {
    if (indexSize === 1) {
      return buf[i]
    } else {
      return buf.readUInt16BE(i * indexSize)
    }
  }

  var i
  if (dir) {
    var foundIndex = -1
    for (i = byteOffset; i < arrLength; i++) {
      if (read(arr, i) === read(val, foundIndex === -1 ? 0 : i - foundIndex)) {
        if (foundIndex === -1) foundIndex = i
        if (i - foundIndex + 1 === valLength) return foundIndex * indexSize
      } else {
        if (foundIndex !== -1) i -= i - foundIndex
        foundIndex = -1
      }
    }
  } else {
    if (byteOffset + valLength > arrLength) byteOffset = arrLength - valLength
    for (i = byteOffset; i >= 0; i--) {
      var found = true
      for (var j = 0; j < valLength; j++) {
        if (read(arr, i + j) !== read(val, j)) {
          found = false
          break
        }
      }
      if (found) return i
    }
  }

  return -1
}

Buffer.prototype.includes = function includes (val, byteOffset, encoding) {
  return this.indexOf(val, byteOffset, encoding) !== -1
}

Buffer.prototype.indexOf = function indexOf (val, byteOffset, encoding) {
  return bidirectionalIndexOf(this, val, byteOffset, encoding, true)
}

Buffer.prototype.lastIndexOf = function lastIndexOf (val, byteOffset, encoding) {
  return bidirectionalIndexOf(this, val, byteOffset, encoding, false)
}

function hexWrite (buf, string, offset, length) {
  offset = Number(offset) || 0
  var remaining = buf.length - offset
  if (!length) {
    length = remaining
  } else {
    length = Number(length)
    if (length > remaining) {
      length = remaining
    }
  }

  var strLen = string.length

  if (length > strLen / 2) {
    length = strLen / 2
  }
  for (var i = 0; i < length; ++i) {
    var parsed = parseInt(string.substr(i * 2, 2), 16)
    if (numberIsNaN(parsed)) return i
    buf[offset + i] = parsed
  }
  return i
}

function utf8Write (buf, string, offset, length) {
  return blitBuffer(utf8ToBytes(string, buf.length - offset), buf, offset, length)
}

function asciiWrite (buf, string, offset, length) {
  return blitBuffer(asciiToBytes(string), buf, offset, length)
}

function latin1Write (buf, string, offset, length) {
  return asciiWrite(buf, string, offset, length)
}

function base64Write (buf, string, offset, length) {
  return blitBuffer(base64ToBytes(string), buf, offset, length)
}

function ucs2Write (buf, string, offset, length) {
  return blitBuffer(utf16leToBytes(string, buf.length - offset), buf, offset, length)
}

Buffer.prototype.write = function write (string, offset, length, encoding) {
  // Buffer#write(string)
  if (offset === undefined) {
    encoding = 'utf8'
    length = this.length
    offset = 0
  // Buffer#write(string, encoding)
  } else if (length === undefined && typeof offset === 'string') {
    encoding = offset
    length = this.length
    offset = 0
  // Buffer#write(string, offset[, length][, encoding])
  } else if (isFinite(offset)) {
    offset = offset >>> 0
    if (isFinite(length)) {
      length = length >>> 0
      if (encoding === undefined) encoding = 'utf8'
    } else {
      encoding = length
      length = undefined
    }
  } else {
    throw new Error(
      'Buffer.write(string, encoding, offset[, length]) is no longer supported'
    )
  }

  var remaining = this.length - offset
  if (length === undefined || length > remaining) length = remaining

  if ((string.length > 0 && (length < 0 || offset < 0)) || offset > this.length) {
    throw new RangeError('Attempt to write outside buffer bounds')
  }

  if (!encoding) encoding = 'utf8'

  var loweredCase = false
  for (;;) {
    switch (encoding) {
      case 'hex':
        return hexWrite(this, string, offset, length)

      case 'utf8':
      case 'utf-8':
        return utf8Write(this, string, offset, length)

      case 'ascii':
        return asciiWrite(this, string, offset, length)

      case 'latin1':
      case 'binary':
        return latin1Write(this, string, offset, length)

      case 'base64':
        // Warning: maxLength not taken into account in base64Write
        return base64Write(this, string, offset, length)

      case 'ucs2':
      case 'ucs-2':
      case 'utf16le':
      case 'utf-16le':
        return ucs2Write(this, string, offset, length)

      default:
        if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
        encoding = ('' + encoding).toLowerCase()
        loweredCase = true
    }
  }
}

Buffer.prototype.toJSON = function toJSON () {
  return {
    type: 'Buffer',
    data: Array.prototype.slice.call(this._arr || this, 0)
  }
}

function base64Slice (buf, start, end) {
  if (start === 0 && end === buf.length) {
    return base64.fromByteArray(buf)
  } else {
    return base64.fromByteArray(buf.slice(start, end))
  }
}

function utf8Slice (buf, start, end) {
  end = Math.min(buf.length, end)
  var res = []

  var i = start
  while (i < end) {
    var firstByte = buf[i]
    var codePoint = null
    var bytesPerSequence = (firstByte > 0xEF) ? 4
      : (firstByte > 0xDF) ? 3
        : (firstByte > 0xBF) ? 2
          : 1

    if (i + bytesPerSequence <= end) {
      var secondByte, thirdByte, fourthByte, tempCodePoint

      switch (bytesPerSequence) {
        case 1:
          if (firstByte < 0x80) {
            codePoint = firstByte
          }
          break
        case 2:
          secondByte = buf[i + 1]
          if ((secondByte & 0xC0) === 0x80) {
            tempCodePoint = (firstByte & 0x1F) << 0x6 | (secondByte & 0x3F)
            if (tempCodePoint > 0x7F) {
              codePoint = tempCodePoint
            }
          }
          break
        case 3:
          secondByte = buf[i + 1]
          thirdByte = buf[i + 2]
          if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80) {
            tempCodePoint = (firstByte & 0xF) << 0xC | (secondByte & 0x3F) << 0x6 | (thirdByte & 0x3F)
            if (tempCodePoint > 0x7FF && (tempCodePoint < 0xD800 || tempCodePoint > 0xDFFF)) {
              codePoint = tempCodePoint
            }
          }
          break
        case 4:
          secondByte = buf[i + 1]
          thirdByte = buf[i + 2]
          fourthByte = buf[i + 3]
          if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80 && (fourthByte & 0xC0) === 0x80) {
            tempCodePoint = (firstByte & 0xF) << 0x12 | (secondByte & 0x3F) << 0xC | (thirdByte & 0x3F) << 0x6 | (fourthByte & 0x3F)
            if (tempCodePoint > 0xFFFF && tempCodePoint < 0x110000) {
              codePoint = tempCodePoint
            }
          }
      }
    }

    if (codePoint === null) {
      // we did not generate a valid codePoint so insert a
      // replacement char (U+FFFD) and advance only 1 byte
      codePoint = 0xFFFD
      bytesPerSequence = 1
    } else if (codePoint > 0xFFFF) {
      // encode to utf16 (surrogate pair dance)
      codePoint -= 0x10000
      res.push(codePoint >>> 10 & 0x3FF | 0xD800)
      codePoint = 0xDC00 | codePoint & 0x3FF
    }

    res.push(codePoint)
    i += bytesPerSequence
  }

  return decodeCodePointsArray(res)
}

// Based on http://stackoverflow.com/a/22747272/680742, the browser with
// the lowest limit is Chrome, with 0x10000 args.
// We go 1 magnitude less, for safety
var MAX_ARGUMENTS_LENGTH = 0x1000

function decodeCodePointsArray (codePoints) {
  var len = codePoints.length
  if (len <= MAX_ARGUMENTS_LENGTH) {
    return String.fromCharCode.apply(String, codePoints) // avoid extra slice()
  }

  // Decode in chunks to avoid "call stack size exceeded".
  var res = ''
  var i = 0
  while (i < len) {
    res += String.fromCharCode.apply(
      String,
      codePoints.slice(i, i += MAX_ARGUMENTS_LENGTH)
    )
  }
  return res
}

function asciiSlice (buf, start, end) {
  var ret = ''
  end = Math.min(buf.length, end)

  for (var i = start; i < end; ++i) {
    ret += String.fromCharCode(buf[i] & 0x7F)
  }
  return ret
}

function latin1Slice (buf, start, end) {
  var ret = ''
  end = Math.min(buf.length, end)

  for (var i = start; i < end; ++i) {
    ret += String.fromCharCode(buf[i])
  }
  return ret
}

function hexSlice (buf, start, end) {
  var len = buf.length

  if (!start || start < 0) start = 0
  if (!end || end < 0 || end > len) end = len

  var out = ''
  for (var i = start; i < end; ++i) {
    out += toHex(buf[i])
  }
  return out
}

function utf16leSlice (buf, start, end) {
  var bytes = buf.slice(start, end)
  var res = ''
  for (var i = 0; i < bytes.length; i += 2) {
    res += String.fromCharCode(bytes[i] + (bytes[i + 1] * 256))
  }
  return res
}

Buffer.prototype.slice = function slice (start, end) {
  var len = this.length
  start = ~~start
  end = end === undefined ? len : ~~end

  if (start < 0) {
    start += len
    if (start < 0) start = 0
  } else if (start > len) {
    start = len
  }

  if (end < 0) {
    end += len
    if (end < 0) end = 0
  } else if (end > len) {
    end = len
  }

  if (end < start) end = start

  var newBuf = this.subarray(start, end)
  // Return an augmented `Uint8Array` instance
  newBuf.__proto__ = Buffer.prototype
  return newBuf
}

/*
 * Need to make sure that buffer isn't trying to write out of bounds.
 */
function checkOffset (offset, ext, length) {
  if ((offset % 1) !== 0 || offset < 0) throw new RangeError('offset is not uint')
  if (offset + ext > length) throw new RangeError('Trying to access beyond buffer length')
}

Buffer.prototype.readUIntLE = function readUIntLE (offset, byteLength, noAssert) {
  offset = offset >>> 0
  byteLength = byteLength >>> 0
  if (!noAssert) checkOffset(offset, byteLength, this.length)

  var val = this[offset]
  var mul = 1
  var i = 0
  while (++i < byteLength && (mul *= 0x100)) {
    val += this[offset + i] * mul
  }

  return val
}

Buffer.prototype.readUIntBE = function readUIntBE (offset, byteLength, noAssert) {
  offset = offset >>> 0
  byteLength = byteLength >>> 0
  if (!noAssert) {
    checkOffset(offset, byteLength, this.length)
  }

  var val = this[offset + --byteLength]
  var mul = 1
  while (byteLength > 0 && (mul *= 0x100)) {
    val += this[offset + --byteLength] * mul
  }

  return val
}

Buffer.prototype.readUInt8 = function readUInt8 (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 1, this.length)
  return this[offset]
}

Buffer.prototype.readUInt16LE = function readUInt16LE (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 2, this.length)
  return this[offset] | (this[offset + 1] << 8)
}

Buffer.prototype.readUInt16BE = function readUInt16BE (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 2, this.length)
  return (this[offset] << 8) | this[offset + 1]
}

Buffer.prototype.readUInt32LE = function readUInt32LE (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 4, this.length)

  return ((this[offset]) |
      (this[offset + 1] << 8) |
      (this[offset + 2] << 16)) +
      (this[offset + 3] * 0x1000000)
}

Buffer.prototype.readUInt32BE = function readUInt32BE (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 4, this.length)

  return (this[offset] * 0x1000000) +
    ((this[offset + 1] << 16) |
    (this[offset + 2] << 8) |
    this[offset + 3])
}

Buffer.prototype.readIntLE = function readIntLE (offset, byteLength, noAssert) {
  offset = offset >>> 0
  byteLength = byteLength >>> 0
  if (!noAssert) checkOffset(offset, byteLength, this.length)

  var val = this[offset]
  var mul = 1
  var i = 0
  while (++i < byteLength && (mul *= 0x100)) {
    val += this[offset + i] * mul
  }
  mul *= 0x80

  if (val >= mul) val -= Math.pow(2, 8 * byteLength)

  return val
}

Buffer.prototype.readIntBE = function readIntBE (offset, byteLength, noAssert) {
  offset = offset >>> 0
  byteLength = byteLength >>> 0
  if (!noAssert) checkOffset(offset, byteLength, this.length)

  var i = byteLength
  var mul = 1
  var val = this[offset + --i]
  while (i > 0 && (mul *= 0x100)) {
    val += this[offset + --i] * mul
  }
  mul *= 0x80

  if (val >= mul) val -= Math.pow(2, 8 * byteLength)

  return val
}

Buffer.prototype.readInt8 = function readInt8 (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 1, this.length)
  if (!(this[offset] & 0x80)) return (this[offset])
  return ((0xff - this[offset] + 1) * -1)
}

Buffer.prototype.readInt16LE = function readInt16LE (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 2, this.length)
  var val = this[offset] | (this[offset + 1] << 8)
  return (val & 0x8000) ? val | 0xFFFF0000 : val
}

Buffer.prototype.readInt16BE = function readInt16BE (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 2, this.length)
  var val = this[offset + 1] | (this[offset] << 8)
  return (val & 0x8000) ? val | 0xFFFF0000 : val
}

Buffer.prototype.readInt32LE = function readInt32LE (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 4, this.length)

  return (this[offset]) |
    (this[offset + 1] << 8) |
    (this[offset + 2] << 16) |
    (this[offset + 3] << 24)
}

Buffer.prototype.readInt32BE = function readInt32BE (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 4, this.length)

  return (this[offset] << 24) |
    (this[offset + 1] << 16) |
    (this[offset + 2] << 8) |
    (this[offset + 3])
}

Buffer.prototype.readFloatLE = function readFloatLE (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 4, this.length)
  return ieee754.read(this, offset, true, 23, 4)
}

Buffer.prototype.readFloatBE = function readFloatBE (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 4, this.length)
  return ieee754.read(this, offset, false, 23, 4)
}

Buffer.prototype.readDoubleLE = function readDoubleLE (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 8, this.length)
  return ieee754.read(this, offset, true, 52, 8)
}

Buffer.prototype.readDoubleBE = function readDoubleBE (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 8, this.length)
  return ieee754.read(this, offset, false, 52, 8)
}

function checkInt (buf, value, offset, ext, max, min) {
  if (!Buffer.isBuffer(buf)) throw new TypeError('"buffer" argument must be a Buffer instance')
  if (value > max || value < min) throw new RangeError('"value" argument is out of bounds')
  if (offset + ext > buf.length) throw new RangeError('Index out of range')
}

Buffer.prototype.writeUIntLE = function writeUIntLE (value, offset, byteLength, noAssert) {
  value = +value
  offset = offset >>> 0
  byteLength = byteLength >>> 0
  if (!noAssert) {
    var maxBytes = Math.pow(2, 8 * byteLength) - 1
    checkInt(this, value, offset, byteLength, maxBytes, 0)
  }

  var mul = 1
  var i = 0
  this[offset] = value & 0xFF
  while (++i < byteLength && (mul *= 0x100)) {
    this[offset + i] = (value / mul) & 0xFF
  }

  return offset + byteLength
}

Buffer.prototype.writeUIntBE = function writeUIntBE (value, offset, byteLength, noAssert) {
  value = +value
  offset = offset >>> 0
  byteLength = byteLength >>> 0
  if (!noAssert) {
    var maxBytes = Math.pow(2, 8 * byteLength) - 1
    checkInt(this, value, offset, byteLength, maxBytes, 0)
  }

  var i = byteLength - 1
  var mul = 1
  this[offset + i] = value & 0xFF
  while (--i >= 0 && (mul *= 0x100)) {
    this[offset + i] = (value / mul) & 0xFF
  }

  return offset + byteLength
}

Buffer.prototype.writeUInt8 = function writeUInt8 (value, offset, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) checkInt(this, value, offset, 1, 0xff, 0)
  this[offset] = (value & 0xff)
  return offset + 1
}

Buffer.prototype.writeUInt16LE = function writeUInt16LE (value, offset, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)
  this[offset] = (value & 0xff)
  this[offset + 1] = (value >>> 8)
  return offset + 2
}

Buffer.prototype.writeUInt16BE = function writeUInt16BE (value, offset, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)
  this[offset] = (value >>> 8)
  this[offset + 1] = (value & 0xff)
  return offset + 2
}

Buffer.prototype.writeUInt32LE = function writeUInt32LE (value, offset, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)
  this[offset + 3] = (value >>> 24)
  this[offset + 2] = (value >>> 16)
  this[offset + 1] = (value >>> 8)
  this[offset] = (value & 0xff)
  return offset + 4
}

Buffer.prototype.writeUInt32BE = function writeUInt32BE (value, offset, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)
  this[offset] = (value >>> 24)
  this[offset + 1] = (value >>> 16)
  this[offset + 2] = (value >>> 8)
  this[offset + 3] = (value & 0xff)
  return offset + 4
}

Buffer.prototype.writeIntLE = function writeIntLE (value, offset, byteLength, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) {
    var limit = Math.pow(2, (8 * byteLength) - 1)

    checkInt(this, value, offset, byteLength, limit - 1, -limit)
  }

  var i = 0
  var mul = 1
  var sub = 0
  this[offset] = value & 0xFF
  while (++i < byteLength && (mul *= 0x100)) {
    if (value < 0 && sub === 0 && this[offset + i - 1] !== 0) {
      sub = 1
    }
    this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
  }

  return offset + byteLength
}

Buffer.prototype.writeIntBE = function writeIntBE (value, offset, byteLength, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) {
    var limit = Math.pow(2, (8 * byteLength) - 1)

    checkInt(this, value, offset, byteLength, limit - 1, -limit)
  }

  var i = byteLength - 1
  var mul = 1
  var sub = 0
  this[offset + i] = value & 0xFF
  while (--i >= 0 && (mul *= 0x100)) {
    if (value < 0 && sub === 0 && this[offset + i + 1] !== 0) {
      sub = 1
    }
    this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
  }

  return offset + byteLength
}

Buffer.prototype.writeInt8 = function writeInt8 (value, offset, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) checkInt(this, value, offset, 1, 0x7f, -0x80)
  if (value < 0) value = 0xff + value + 1
  this[offset] = (value & 0xff)
  return offset + 1
}

Buffer.prototype.writeInt16LE = function writeInt16LE (value, offset, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)
  this[offset] = (value & 0xff)
  this[offset + 1] = (value >>> 8)
  return offset + 2
}

Buffer.prototype.writeInt16BE = function writeInt16BE (value, offset, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)
  this[offset] = (value >>> 8)
  this[offset + 1] = (value & 0xff)
  return offset + 2
}

Buffer.prototype.writeInt32LE = function writeInt32LE (value, offset, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
  this[offset] = (value & 0xff)
  this[offset + 1] = (value >>> 8)
  this[offset + 2] = (value >>> 16)
  this[offset + 3] = (value >>> 24)
  return offset + 4
}

Buffer.prototype.writeInt32BE = function writeInt32BE (value, offset, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
  if (value < 0) value = 0xffffffff + value + 1
  this[offset] = (value >>> 24)
  this[offset + 1] = (value >>> 16)
  this[offset + 2] = (value >>> 8)
  this[offset + 3] = (value & 0xff)
  return offset + 4
}

function checkIEEE754 (buf, value, offset, ext, max, min) {
  if (offset + ext > buf.length) throw new RangeError('Index out of range')
  if (offset < 0) throw new RangeError('Index out of range')
}

function writeFloat (buf, value, offset, littleEndian, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) {
    checkIEEE754(buf, value, offset, 4, 3.4028234663852886e+38, -3.4028234663852886e+38)
  }
  ieee754.write(buf, value, offset, littleEndian, 23, 4)
  return offset + 4
}

Buffer.prototype.writeFloatLE = function writeFloatLE (value, offset, noAssert) {
  return writeFloat(this, value, offset, true, noAssert)
}

Buffer.prototype.writeFloatBE = function writeFloatBE (value, offset, noAssert) {
  return writeFloat(this, value, offset, false, noAssert)
}

function writeDouble (buf, value, offset, littleEndian, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) {
    checkIEEE754(buf, value, offset, 8, 1.7976931348623157E+308, -1.7976931348623157E+308)
  }
  ieee754.write(buf, value, offset, littleEndian, 52, 8)
  return offset + 8
}

Buffer.prototype.writeDoubleLE = function writeDoubleLE (value, offset, noAssert) {
  return writeDouble(this, value, offset, true, noAssert)
}

Buffer.prototype.writeDoubleBE = function writeDoubleBE (value, offset, noAssert) {
  return writeDouble(this, value, offset, false, noAssert)
}

// copy(targetBuffer, targetStart=0, sourceStart=0, sourceEnd=buffer.length)
Buffer.prototype.copy = function copy (target, targetStart, start, end) {
  if (!Buffer.isBuffer(target)) throw new TypeError('argument should be a Buffer')
  if (!start) start = 0
  if (!end && end !== 0) end = this.length
  if (targetStart >= target.length) targetStart = target.length
  if (!targetStart) targetStart = 0
  if (end > 0 && end < start) end = start

  // Copy 0 bytes; we're done
  if (end === start) return 0
  if (target.length === 0 || this.length === 0) return 0

  // Fatal error conditions
  if (targetStart < 0) {
    throw new RangeError('targetStart out of bounds')
  }
  if (start < 0 || start >= this.length) throw new RangeError('Index out of range')
  if (end < 0) throw new RangeError('sourceEnd out of bounds')

  // Are we oob?
  if (end > this.length) end = this.length
  if (target.length - targetStart < end - start) {
    end = target.length - targetStart + start
  }

  var len = end - start

  if (this === target && typeof Uint8Array.prototype.copyWithin === 'function') {
    // Use built-in when available, missing from IE11
    this.copyWithin(targetStart, start, end)
  } else if (this === target && start < targetStart && targetStart < end) {
    // descending copy from end
    for (var i = len - 1; i >= 0; --i) {
      target[i + targetStart] = this[i + start]
    }
  } else {
    Uint8Array.prototype.set.call(
      target,
      this.subarray(start, end),
      targetStart
    )
  }

  return len
}

// Usage:
//    buffer.fill(number[, offset[, end]])
//    buffer.fill(buffer[, offset[, end]])
//    buffer.fill(string[, offset[, end]][, encoding])
Buffer.prototype.fill = function fill (val, start, end, encoding) {
  // Handle string cases:
  if (typeof val === 'string') {
    if (typeof start === 'string') {
      encoding = start
      start = 0
      end = this.length
    } else if (typeof end === 'string') {
      encoding = end
      end = this.length
    }
    if (encoding !== undefined && typeof encoding !== 'string') {
      throw new TypeError('encoding must be a string')
    }
    if (typeof encoding === 'string' && !Buffer.isEncoding(encoding)) {
      throw new TypeError('Unknown encoding: ' + encoding)
    }
    if (val.length === 1) {
      var code = val.charCodeAt(0)
      if ((encoding === 'utf8' && code < 128) ||
          encoding === 'latin1') {
        // Fast path: If `val` fits into a single byte, use that numeric value.
        val = code
      }
    }
  } else if (typeof val === 'number') {
    val = val & 255
  }

  // Invalid ranges are not set to a default, so can range check early.
  if (start < 0 || this.length < start || this.length < end) {
    throw new RangeError('Out of range index')
  }

  if (end <= start) {
    return this
  }

  start = start >>> 0
  end = end === undefined ? this.length : end >>> 0

  if (!val) val = 0

  var i
  if (typeof val === 'number') {
    for (i = start; i < end; ++i) {
      this[i] = val
    }
  } else {
    var bytes = Buffer.isBuffer(val)
      ? val
      : Buffer.from(val, encoding)
    var len = bytes.length
    if (len === 0) {
      throw new TypeError('The value "' + val +
        '" is invalid for argument "value"')
    }
    for (i = 0; i < end - start; ++i) {
      this[i + start] = bytes[i % len]
    }
  }

  return this
}

// HELPER FUNCTIONS
// ================

var INVALID_BASE64_RE = /[^+/0-9A-Za-z-_]/g

function base64clean (str) {
  // Node takes equal signs as end of the Base64 encoding
  str = str.split('=')[0]
  // Node strips out invalid characters like \n and \t from the string, base64-js does not
  str = str.trim().replace(INVALID_BASE64_RE, '')
  // Node converts strings with length < 2 to ''
  if (str.length < 2) return ''
  // Node allows for non-padded base64 strings (missing trailing ===), base64-js does not
  while (str.length % 4 !== 0) {
    str = str + '='
  }
  return str
}

function toHex (n) {
  if (n < 16) return '0' + n.toString(16)
  return n.toString(16)
}

function utf8ToBytes (string, units) {
  units = units || Infinity
  var codePoint
  var length = string.length
  var leadSurrogate = null
  var bytes = []

  for (var i = 0; i < length; ++i) {
    codePoint = string.charCodeAt(i)

    // is surrogate component
    if (codePoint > 0xD7FF && codePoint < 0xE000) {
      // last char was a lead
      if (!leadSurrogate) {
        // no lead yet
        if (codePoint > 0xDBFF) {
          // unexpected trail
          if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
          continue
        } else if (i + 1 === length) {
          // unpaired lead
          if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
          continue
        }

        // valid lead
        leadSurrogate = codePoint

        continue
      }

      // 2 leads in a row
      if (codePoint < 0xDC00) {
        if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
        leadSurrogate = codePoint
        continue
      }

      // valid surrogate pair
      codePoint = (leadSurrogate - 0xD800 << 10 | codePoint - 0xDC00) + 0x10000
    } else if (leadSurrogate) {
      // valid bmp char, but last char was a lead
      if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
    }

    leadSurrogate = null

    // encode utf8
    if (codePoint < 0x80) {
      if ((units -= 1) < 0) break
      bytes.push(codePoint)
    } else if (codePoint < 0x800) {
      if ((units -= 2) < 0) break
      bytes.push(
        codePoint >> 0x6 | 0xC0,
        codePoint & 0x3F | 0x80
      )
    } else if (codePoint < 0x10000) {
      if ((units -= 3) < 0) break
      bytes.push(
        codePoint >> 0xC | 0xE0,
        codePoint >> 0x6 & 0x3F | 0x80,
        codePoint & 0x3F | 0x80
      )
    } else if (codePoint < 0x110000) {
      if ((units -= 4) < 0) break
      bytes.push(
        codePoint >> 0x12 | 0xF0,
        codePoint >> 0xC & 0x3F | 0x80,
        codePoint >> 0x6 & 0x3F | 0x80,
        codePoint & 0x3F | 0x80
      )
    } else {
      throw new Error('Invalid code point')
    }
  }

  return bytes
}

function asciiToBytes (str) {
  var byteArray = []
  for (var i = 0; i < str.length; ++i) {
    // Node's code seems to be doing this and not & 0x7F..
    byteArray.push(str.charCodeAt(i) & 0xFF)
  }
  return byteArray
}

function utf16leToBytes (str, units) {
  var c, hi, lo
  var byteArray = []
  for (var i = 0; i < str.length; ++i) {
    if ((units -= 2) < 0) break

    c = str.charCodeAt(i)
    hi = c >> 8
    lo = c % 256
    byteArray.push(lo)
    byteArray.push(hi)
  }

  return byteArray
}

function base64ToBytes (str) {
  return base64.toByteArray(base64clean(str))
}

function blitBuffer (src, dst, offset, length) {
  for (var i = 0; i < length; ++i) {
    if ((i + offset >= dst.length) || (i >= src.length)) break
    dst[i + offset] = src[i]
  }
  return i
}

// ArrayBuffer or Uint8Array objects from other contexts (i.e. iframes) do not pass
// the `instanceof` check but they should be treated as of that type.
// See: https://github.com/feross/buffer/issues/166
function isInstance (obj, type) {
  return obj instanceof type ||
    (obj != null && obj.constructor != null && obj.constructor.name != null &&
      obj.constructor.name === type.name)
}
function numberIsNaN (obj) {
  // For IE11 support
  return obj !== obj // eslint-disable-line no-self-compare
}

}).call(this)}).call(this,require("buffer").Buffer)
},{"base64-js":13,"buffer":17,"ieee754":23}],18:[function(require,module,exports){
(function (process){(function (){
/* eslint-env browser */

/**
 * This is the web browser implementation of `debug()`.
 */

exports.formatArgs = formatArgs;
exports.save = save;
exports.load = load;
exports.useColors = useColors;
exports.storage = localstorage();
exports.destroy = (() => {
	let warned = false;

	return () => {
		if (!warned) {
			warned = true;
			console.warn('Instance method `debug.destroy()` is deprecated and no longer does anything. It will be removed in the next major version of `debug`.');
		}
	};
})();

/**
 * Colors.
 */

exports.colors = [
	'#0000CC',
	'#0000FF',
	'#0033CC',
	'#0033FF',
	'#0066CC',
	'#0066FF',
	'#0099CC',
	'#0099FF',
	'#00CC00',
	'#00CC33',
	'#00CC66',
	'#00CC99',
	'#00CCCC',
	'#00CCFF',
	'#3300CC',
	'#3300FF',
	'#3333CC',
	'#3333FF',
	'#3366CC',
	'#3366FF',
	'#3399CC',
	'#3399FF',
	'#33CC00',
	'#33CC33',
	'#33CC66',
	'#33CC99',
	'#33CCCC',
	'#33CCFF',
	'#6600CC',
	'#6600FF',
	'#6633CC',
	'#6633FF',
	'#66CC00',
	'#66CC33',
	'#9900CC',
	'#9900FF',
	'#9933CC',
	'#9933FF',
	'#99CC00',
	'#99CC33',
	'#CC0000',
	'#CC0033',
	'#CC0066',
	'#CC0099',
	'#CC00CC',
	'#CC00FF',
	'#CC3300',
	'#CC3333',
	'#CC3366',
	'#CC3399',
	'#CC33CC',
	'#CC33FF',
	'#CC6600',
	'#CC6633',
	'#CC9900',
	'#CC9933',
	'#CCCC00',
	'#CCCC33',
	'#FF0000',
	'#FF0033',
	'#FF0066',
	'#FF0099',
	'#FF00CC',
	'#FF00FF',
	'#FF3300',
	'#FF3333',
	'#FF3366',
	'#FF3399',
	'#FF33CC',
	'#FF33FF',
	'#FF6600',
	'#FF6633',
	'#FF9900',
	'#FF9933',
	'#FFCC00',
	'#FFCC33'
];

/**
 * Currently only WebKit-based Web Inspectors, Firefox >= v31,
 * and the Firebug extension (any Firefox version) are known
 * to support "%c" CSS customizations.
 *
 * TODO: add a `localStorage` variable to explicitly enable/disable colors
 */

// eslint-disable-next-line complexity
function useColors() {
	// NB: In an Electron preload script, document will be defined but not fully
	// initialized. Since we know we're in Chrome, we'll just detect this case
	// explicitly
	if (typeof window !== 'undefined' && window.process && (window.process.type === 'renderer' || window.process.__nwjs)) {
		return true;
	}

	// Internet Explorer and Edge do not support colors.
	if (typeof navigator !== 'undefined' && navigator.userAgent && navigator.userAgent.toLowerCase().match(/(edge|trident)\/(\d+)/)) {
		return false;
	}

	// Is webkit? http://stackoverflow.com/a/16459606/376773
	// document is undefined in react-native: https://github.com/facebook/react-native/pull/1632
	return (typeof document !== 'undefined' && document.documentElement && document.documentElement.style && document.documentElement.style.WebkitAppearance) ||
		// Is firebug? http://stackoverflow.com/a/398120/376773
		(typeof window !== 'undefined' && window.console && (window.console.firebug || (window.console.exception && window.console.table))) ||
		// Is firefox >= v31?
		// https://developer.mozilla.org/en-US/docs/Tools/Web_Console#Styling_messages
		(typeof navigator !== 'undefined' && navigator.userAgent && navigator.userAgent.toLowerCase().match(/firefox\/(\d+)/) && parseInt(RegExp.$1, 10) >= 31) ||
		// Double check webkit in userAgent just in case we are in a worker
		(typeof navigator !== 'undefined' && navigator.userAgent && navigator.userAgent.toLowerCase().match(/applewebkit\/(\d+)/));
}

/**
 * Colorize log arguments if enabled.
 *
 * @api public
 */

function formatArgs(args) {
	args[0] = (this.useColors ? '%c' : '') +
		this.namespace +
		(this.useColors ? ' %c' : ' ') +
		args[0] +
		(this.useColors ? '%c ' : ' ') +
		'+' + module.exports.humanize(this.diff);

	if (!this.useColors) {
		return;
	}

	const c = 'color: ' + this.color;
	args.splice(1, 0, c, 'color: inherit');

	// The final "%c" is somewhat tricky, because there could be other
	// arguments passed either before or after the %c, so we need to
	// figure out the correct index to insert the CSS into
	let index = 0;
	let lastC = 0;
	args[0].replace(/%[a-zA-Z%]/g, match => {
		if (match === '%%') {
			return;
		}
		index++;
		if (match === '%c') {
			// We only are interested in the *last* %c
			// (the user may have provided their own)
			lastC = index;
		}
	});

	args.splice(lastC, 0, c);
}

/**
 * Invokes `console.debug()` when available.
 * No-op when `console.debug` is not a "function".
 * If `console.debug` is not available, falls back
 * to `console.log`.
 *
 * @api public
 */
exports.log = console.debug || console.log || (() => {});

/**
 * Save `namespaces`.
 *
 * @param {String} namespaces
 * @api private
 */
function save(namespaces) {
	try {
		if (namespaces) {
			exports.storage.setItem('debug', namespaces);
		} else {
			exports.storage.removeItem('debug');
		}
	} catch (error) {
		// Swallow
		// XXX (@Qix-) should we be logging these?
	}
}

/**
 * Load `namespaces`.
 *
 * @return {String} returns the previously persisted debug modes
 * @api private
 */
function load() {
	let r;
	try {
		r = exports.storage.getItem('debug');
	} catch (error) {
		// Swallow
		// XXX (@Qix-) should we be logging these?
	}

	// If debug isn't set in LS, and we're in Electron, try to load $DEBUG
	if (!r && typeof process !== 'undefined' && 'env' in process) {
		r = process.env.DEBUG;
	}

	return r;
}

/**
 * Localstorage attempts to return the localstorage.
 *
 * This is necessary because safari throws
 * when a user disables cookies/localstorage
 * and you attempt to access it.
 *
 * @return {LocalStorage}
 * @api private
 */

function localstorage() {
	try {
		// TVMLKit (Apple TV JS Runtime) does not have a window object, just localStorage in the global context
		// The Browser also has localStorage in the global context.
		return localStorage;
	} catch (error) {
		// Swallow
		// XXX (@Qix-) should we be logging these?
	}
}

module.exports = require('./common')(exports);

const {formatters} = module.exports;

/**
 * Map %j to `JSON.stringify()`, since no Web Inspectors do that by default.
 */

formatters.j = function (v) {
	try {
		return JSON.stringify(v);
	} catch (error) {
		return '[UnexpectedJSONParseError]: ' + error.message;
	}
};

}).call(this)}).call(this,require('_process'))
},{"./common":19,"_process":50}],19:[function(require,module,exports){

/**
 * This is the common logic for both the Node.js and web browser
 * implementations of `debug()`.
 */

function setup(env) {
	createDebug.debug = createDebug;
	createDebug.default = createDebug;
	createDebug.coerce = coerce;
	createDebug.disable = disable;
	createDebug.enable = enable;
	createDebug.enabled = enabled;
	createDebug.humanize = require('ms');
	createDebug.destroy = destroy;

	Object.keys(env).forEach(key => {
		createDebug[key] = env[key];
	});

	/**
	* The currently active debug mode names, and names to skip.
	*/

	createDebug.names = [];
	createDebug.skips = [];

	/**
	* Map of special "%n" handling functions, for the debug "format" argument.
	*
	* Valid key names are a single, lower or upper-case letter, i.e. "n" and "N".
	*/
	createDebug.formatters = {};

	/**
	* Selects a color for a debug namespace
	* @param {String} namespace The namespace string for the debug instance to be colored
	* @return {Number|String} An ANSI color code for the given namespace
	* @api private
	*/
	function selectColor(namespace) {
		let hash = 0;

		for (let i = 0; i < namespace.length; i++) {
			hash = ((hash << 5) - hash) + namespace.charCodeAt(i);
			hash |= 0; // Convert to 32bit integer
		}

		return createDebug.colors[Math.abs(hash) % createDebug.colors.length];
	}
	createDebug.selectColor = selectColor;

	/**
	* Create a debugger with the given `namespace`.
	*
	* @param {String} namespace
	* @return {Function}
	* @api public
	*/
	function createDebug(namespace) {
		let prevTime;
		let enableOverride = null;
		let namespacesCache;
		let enabledCache;

		function debug(...args) {
			// Disabled?
			if (!debug.enabled) {
				return;
			}

			const self = debug;

			// Set `diff` timestamp
			const curr = Number(new Date());
			const ms = curr - (prevTime || curr);
			self.diff = ms;
			self.prev = prevTime;
			self.curr = curr;
			prevTime = curr;

			args[0] = createDebug.coerce(args[0]);

			if (typeof args[0] !== 'string') {
				// Anything else let's inspect with %O
				args.unshift('%O');
			}

			// Apply any `formatters` transformations
			let index = 0;
			args[0] = args[0].replace(/%([a-zA-Z%])/g, (match, format) => {
				// If we encounter an escaped % then don't increase the array index
				if (match === '%%') {
					return '%';
				}
				index++;
				const formatter = createDebug.formatters[format];
				if (typeof formatter === 'function') {
					const val = args[index];
					match = formatter.call(self, val);

					// Now we need to remove `args[index]` since it's inlined in the `format`
					args.splice(index, 1);
					index--;
				}
				return match;
			});

			// Apply env-specific formatting (colors, etc.)
			createDebug.formatArgs.call(self, args);

			const logFn = self.log || createDebug.log;
			logFn.apply(self, args);
		}

		debug.namespace = namespace;
		debug.useColors = createDebug.useColors();
		debug.color = createDebug.selectColor(namespace);
		debug.extend = extend;
		debug.destroy = createDebug.destroy; // XXX Temporary. Will be removed in the next major release.

		Object.defineProperty(debug, 'enabled', {
			enumerable: true,
			configurable: false,
			get: () => {
				if (enableOverride !== null) {
					return enableOverride;
				}
				if (namespacesCache !== createDebug.namespaces) {
					namespacesCache = createDebug.namespaces;
					enabledCache = createDebug.enabled(namespace);
				}

				return enabledCache;
			},
			set: v => {
				enableOverride = v;
			}
		});

		// Env-specific initialization logic for debug instances
		if (typeof createDebug.init === 'function') {
			createDebug.init(debug);
		}

		return debug;
	}

	function extend(namespace, delimiter) {
		const newDebug = createDebug(this.namespace + (typeof delimiter === 'undefined' ? ':' : delimiter) + namespace);
		newDebug.log = this.log;
		return newDebug;
	}

	/**
	* Enables a debug mode by namespaces. This can include modes
	* separated by a colon and wildcards.
	*
	* @param {String} namespaces
	* @api public
	*/
	function enable(namespaces) {
		createDebug.save(namespaces);
		createDebug.namespaces = namespaces;

		createDebug.names = [];
		createDebug.skips = [];

		let i;
		const split = (typeof namespaces === 'string' ? namespaces : '').split(/[\s,]+/);
		const len = split.length;

		for (i = 0; i < len; i++) {
			if (!split[i]) {
				// ignore empty strings
				continue;
			}

			namespaces = split[i].replace(/\*/g, '.*?');

			if (namespaces[0] === '-') {
				createDebug.skips.push(new RegExp('^' + namespaces.substr(1) + '$'));
			} else {
				createDebug.names.push(new RegExp('^' + namespaces + '$'));
			}
		}
	}

	/**
	* Disable debug output.
	*
	* @return {String} namespaces
	* @api public
	*/
	function disable() {
		const namespaces = [
			...createDebug.names.map(toNamespace),
			...createDebug.skips.map(toNamespace).map(namespace => '-' + namespace)
		].join(',');
		createDebug.enable('');
		return namespaces;
	}

	/**
	* Returns true if the given mode name is enabled, false otherwise.
	*
	* @param {String} name
	* @return {Boolean}
	* @api public
	*/
	function enabled(name) {
		if (name[name.length - 1] === '*') {
			return true;
		}

		let i;
		let len;

		for (i = 0, len = createDebug.skips.length; i < len; i++) {
			if (createDebug.skips[i].test(name)) {
				return false;
			}
		}

		for (i = 0, len = createDebug.names.length; i < len; i++) {
			if (createDebug.names[i].test(name)) {
				return true;
			}
		}

		return false;
	}

	/**
	* Convert regexp to namespace
	*
	* @param {RegExp} regxep
	* @return {String} namespace
	* @api private
	*/
	function toNamespace(regexp) {
		return regexp.toString()
			.substring(2, regexp.toString().length - 2)
			.replace(/\.\*\?$/, '*');
	}

	/**
	* Coerce `val`.
	*
	* @param {Mixed} val
	* @return {Mixed}
	* @api private
	*/
	function coerce(val) {
		if (val instanceof Error) {
			return val.stack || val.message;
		}
		return val;
	}

	/**
	* XXX DO NOT USE. This is a temporary stub function.
	* XXX It WILL be removed in the next major release.
	*/
	function destroy() {
		console.warn('Instance method `debug.destroy()` is deprecated and no longer does anything. It will be removed in the next major version of `debug`.');
	}

	createDebug.enable(createDebug.load());

	return createDebug;
}

module.exports = setup;

},{"ms":45}],20:[function(require,module,exports){
(function (process,Buffer){(function (){
var stream = require('readable-stream')
var eos = require('end-of-stream')
var inherits = require('inherits')
var shift = require('stream-shift')

var SIGNAL_FLUSH = (Buffer.from && Buffer.from !== Uint8Array.from)
  ? Buffer.from([0])
  : new Buffer([0])

var onuncork = function(self, fn) {
  if (self._corked) self.once('uncork', fn)
  else fn()
}

var autoDestroy = function (self, err) {
  if (self._autoDestroy) self.destroy(err)
}

var destroyer = function(self, end) {
  return function(err) {
    if (err) autoDestroy(self, err.message === 'premature close' ? null : err)
    else if (end && !self._ended) self.end()
  }
}

var end = function(ws, fn) {
  if (!ws) return fn()
  if (ws._writableState && ws._writableState.finished) return fn()
  if (ws._writableState) return ws.end(fn)
  ws.end()
  fn()
}

var noop = function() {}

var toStreams2 = function(rs) {
  return new (stream.Readable)({objectMode:true, highWaterMark:16}).wrap(rs)
}

var Duplexify = function(writable, readable, opts) {
  if (!(this instanceof Duplexify)) return new Duplexify(writable, readable, opts)
  stream.Duplex.call(this, opts)

  this._writable = null
  this._readable = null
  this._readable2 = null

  this._autoDestroy = !opts || opts.autoDestroy !== false
  this._forwardDestroy = !opts || opts.destroy !== false
  this._forwardEnd = !opts || opts.end !== false
  this._corked = 1 // start corked
  this._ondrain = null
  this._drained = false
  this._forwarding = false
  this._unwrite = null
  this._unread = null
  this._ended = false

  this.destroyed = false

  if (writable) this.setWritable(writable)
  if (readable) this.setReadable(readable)
}

inherits(Duplexify, stream.Duplex)

Duplexify.obj = function(writable, readable, opts) {
  if (!opts) opts = {}
  opts.objectMode = true
  opts.highWaterMark = 16
  return new Duplexify(writable, readable, opts)
}

Duplexify.prototype.cork = function() {
  if (++this._corked === 1) this.emit('cork')
}

Duplexify.prototype.uncork = function() {
  if (this._corked && --this._corked === 0) this.emit('uncork')
}

Duplexify.prototype.setWritable = function(writable) {
  if (this._unwrite) this._unwrite()

  if (this.destroyed) {
    if (writable && writable.destroy) writable.destroy()
    return
  }

  if (writable === null || writable === false) {
    this.end()
    return
  }

  var self = this
  var unend = eos(writable, {writable:true, readable:false}, destroyer(this, this._forwardEnd))

  var ondrain = function() {
    var ondrain = self._ondrain
    self._ondrain = null
    if (ondrain) ondrain()
  }

  var clear = function() {
    self._writable.removeListener('drain', ondrain)
    unend()
  }

  if (this._unwrite) process.nextTick(ondrain) // force a drain on stream reset to avoid livelocks

  this._writable = writable
  this._writable.on('drain', ondrain)
  this._unwrite = clear

  this.uncork() // always uncork setWritable
}

Duplexify.prototype.setReadable = function(readable) {
  if (this._unread) this._unread()

  if (this.destroyed) {
    if (readable && readable.destroy) readable.destroy()
    return
  }

  if (readable === null || readable === false) {
    this.push(null)
    this.resume()
    return
  }

  var self = this
  var unend = eos(readable, {writable:false, readable:true}, destroyer(this))

  var onreadable = function() {
    self._forward()
  }

  var onend = function() {
    self.push(null)
  }

  var clear = function() {
    self._readable2.removeListener('readable', onreadable)
    self._readable2.removeListener('end', onend)
    unend()
  }

  this._drained = true
  this._readable = readable
  this._readable2 = readable._readableState ? readable : toStreams2(readable)
  this._readable2.on('readable', onreadable)
  this._readable2.on('end', onend)
  this._unread = clear

  this._forward()
}

Duplexify.prototype._read = function() {
  this._drained = true
  this._forward()
}

Duplexify.prototype._forward = function() {
  if (this._forwarding || !this._readable2 || !this._drained) return
  this._forwarding = true

  var data

  while (this._drained && (data = shift(this._readable2)) !== null) {
    if (this.destroyed) continue
    this._drained = this.push(data)
  }

  this._forwarding = false
}

Duplexify.prototype.destroy = function(err, cb) {
  if (!cb) cb = noop
  if (this.destroyed) return cb(null)
  this.destroyed = true

  var self = this
  process.nextTick(function() {
    self._destroy(err)
    cb(null)
  })
}

Duplexify.prototype._destroy = function(err) {
  if (err) {
    var ondrain = this._ondrain
    this._ondrain = null
    if (ondrain) ondrain(err)
    else this.emit('error', err)
  }

  if (this._forwardDestroy) {
    if (this._readable && this._readable.destroy) this._readable.destroy()
    if (this._writable && this._writable.destroy) this._writable.destroy()
  }

  this.emit('close')
}

Duplexify.prototype._write = function(data, enc, cb) {
  if (this.destroyed) return
  if (this._corked) return onuncork(this, this._write.bind(this, data, enc, cb))
  if (data === SIGNAL_FLUSH) return this._finish(cb)
  if (!this._writable) return cb()

  if (this._writable.write(data) === false) this._ondrain = cb
  else if (!this.destroyed) cb()
}

Duplexify.prototype._finish = function(cb) {
  var self = this
  this.emit('preend')
  onuncork(this, function() {
    end(self._forwardEnd && self._writable, function() {
      // haxx to not emit prefinish twice
      if (self._writableState.prefinished === false) self._writableState.prefinished = true
      self.emit('prefinish')
      onuncork(self, cb)
    })
  })
}

Duplexify.prototype.end = function(data, enc, cb) {
  if (typeof data === 'function') return this.end(null, null, data)
  if (typeof enc === 'function') return this.end(data, null, enc)
  this._ended = true
  if (data) this.write(data)
  if (!this._writableState.ending && !this._writableState.destroyed) this.write(SIGNAL_FLUSH)
  return stream.Writable.prototype.end.call(this, cb)
}

module.exports = Duplexify

}).call(this)}).call(this,require('_process'),require("buffer").Buffer)
},{"_process":50,"buffer":17,"end-of-stream":21,"inherits":24,"readable-stream":69,"stream-shift":74}],21:[function(require,module,exports){
(function (process){(function (){
var once = require('once');

var noop = function() {};

var isRequest = function(stream) {
	return stream.setHeader && typeof stream.abort === 'function';
};

var isChildProcess = function(stream) {
	return stream.stdio && Array.isArray(stream.stdio) && stream.stdio.length === 3
};

var eos = function(stream, opts, callback) {
	if (typeof opts === 'function') return eos(stream, null, opts);
	if (!opts) opts = {};

	callback = once(callback || noop);

	var ws = stream._writableState;
	var rs = stream._readableState;
	var readable = opts.readable || (opts.readable !== false && stream.readable);
	var writable = opts.writable || (opts.writable !== false && stream.writable);
	var cancelled = false;

	var onlegacyfinish = function() {
		if (!stream.writable) onfinish();
	};

	var onfinish = function() {
		writable = false;
		if (!readable) callback.call(stream);
	};

	var onend = function() {
		readable = false;
		if (!writable) callback.call(stream);
	};

	var onexit = function(exitCode) {
		callback.call(stream, exitCode ? new Error('exited with error code: ' + exitCode) : null);
	};

	var onerror = function(err) {
		callback.call(stream, err);
	};

	var onclose = function() {
		process.nextTick(onclosenexttick);
	};

	var onclosenexttick = function() {
		if (cancelled) return;
		if (readable && !(rs && (rs.ended && !rs.destroyed))) return callback.call(stream, new Error('premature close'));
		if (writable && !(ws && (ws.ended && !ws.destroyed))) return callback.call(stream, new Error('premature close'));
	};

	var onrequest = function() {
		stream.req.on('finish', onfinish);
	};

	if (isRequest(stream)) {
		stream.on('complete', onfinish);
		stream.on('abort', onclose);
		if (stream.req) onrequest();
		else stream.on('request', onrequest);
	} else if (writable && !ws) { // legacy streams
		stream.on('end', onlegacyfinish);
		stream.on('close', onlegacyfinish);
	}

	if (isChildProcess(stream)) stream.on('exit', onexit);

	stream.on('end', onend);
	stream.on('finish', onfinish);
	if (opts.error !== false) stream.on('error', onerror);
	stream.on('close', onclose);

	return function() {
		cancelled = true;
		stream.removeListener('complete', onfinish);
		stream.removeListener('abort', onclose);
		stream.removeListener('request', onrequest);
		if (stream.req) stream.req.removeListener('finish', onfinish);
		stream.removeListener('end', onlegacyfinish);
		stream.removeListener('close', onlegacyfinish);
		stream.removeListener('finish', onfinish);
		stream.removeListener('exit', onexit);
		stream.removeListener('end', onend);
		stream.removeListener('error', onerror);
		stream.removeListener('close', onclose);
	};
};

module.exports = eos;

}).call(this)}).call(this,require('_process'))
},{"_process":50,"once":48}],22:[function(require,module,exports){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

var objectCreate = Object.create || objectCreatePolyfill
var objectKeys = Object.keys || objectKeysPolyfill
var bind = Function.prototype.bind || functionBindPolyfill

function EventEmitter() {
  if (!this._events || !Object.prototype.hasOwnProperty.call(this, '_events')) {
    this._events = objectCreate(null);
    this._eventsCount = 0;
  }

  this._maxListeners = this._maxListeners || undefined;
}
module.exports = EventEmitter;

// Backwards-compat with node 0.10.x
EventEmitter.EventEmitter = EventEmitter;

EventEmitter.prototype._events = undefined;
EventEmitter.prototype._maxListeners = undefined;

// By default EventEmitters will print a warning if more than 10 listeners are
// added to it. This is a useful default which helps finding memory leaks.
var defaultMaxListeners = 10;

var hasDefineProperty;
try {
  var o = {};
  if (Object.defineProperty) Object.defineProperty(o, 'x', { value: 0 });
  hasDefineProperty = o.x === 0;
} catch (err) { hasDefineProperty = false }
if (hasDefineProperty) {
  Object.defineProperty(EventEmitter, 'defaultMaxListeners', {
    enumerable: true,
    get: function() {
      return defaultMaxListeners;
    },
    set: function(arg) {
      // check whether the input is a positive number (whose value is zero or
      // greater and not a NaN).
      if (typeof arg !== 'number' || arg < 0 || arg !== arg)
        throw new TypeError('"defaultMaxListeners" must be a positive number');
      defaultMaxListeners = arg;
    }
  });
} else {
  EventEmitter.defaultMaxListeners = defaultMaxListeners;
}

// Obviously not all Emitters should be limited to 10. This function allows
// that to be increased. Set to zero for unlimited.
EventEmitter.prototype.setMaxListeners = function setMaxListeners(n) {
  if (typeof n !== 'number' || n < 0 || isNaN(n))
    throw new TypeError('"n" argument must be a positive number');
  this._maxListeners = n;
  return this;
};

function $getMaxListeners(that) {
  if (that._maxListeners === undefined)
    return EventEmitter.defaultMaxListeners;
  return that._maxListeners;
}

EventEmitter.prototype.getMaxListeners = function getMaxListeners() {
  return $getMaxListeners(this);
};

// These standalone emit* functions are used to optimize calling of event
// handlers for fast cases because emit() itself often has a variable number of
// arguments and can be deoptimized because of that. These functions always have
// the same number of arguments and thus do not get deoptimized, so the code
// inside them can execute faster.
function emitNone(handler, isFn, self) {
  if (isFn)
    handler.call(self);
  else {
    var len = handler.length;
    var listeners = arrayClone(handler, len);
    for (var i = 0; i < len; ++i)
      listeners[i].call(self);
  }
}
function emitOne(handler, isFn, self, arg1) {
  if (isFn)
    handler.call(self, arg1);
  else {
    var len = handler.length;
    var listeners = arrayClone(handler, len);
    for (var i = 0; i < len; ++i)
      listeners[i].call(self, arg1);
  }
}
function emitTwo(handler, isFn, self, arg1, arg2) {
  if (isFn)
    handler.call(self, arg1, arg2);
  else {
    var len = handler.length;
    var listeners = arrayClone(handler, len);
    for (var i = 0; i < len; ++i)
      listeners[i].call(self, arg1, arg2);
  }
}
function emitThree(handler, isFn, self, arg1, arg2, arg3) {
  if (isFn)
    handler.call(self, arg1, arg2, arg3);
  else {
    var len = handler.length;
    var listeners = arrayClone(handler, len);
    for (var i = 0; i < len; ++i)
      listeners[i].call(self, arg1, arg2, arg3);
  }
}

function emitMany(handler, isFn, self, args) {
  if (isFn)
    handler.apply(self, args);
  else {
    var len = handler.length;
    var listeners = arrayClone(handler, len);
    for (var i = 0; i < len; ++i)
      listeners[i].apply(self, args);
  }
}

EventEmitter.prototype.emit = function emit(type) {
  var er, handler, len, args, i, events;
  var doError = (type === 'error');

  events = this._events;
  if (events)
    doError = (doError && events.error == null);
  else if (!doError)
    return false;

  // If there is no 'error' event listener then throw.
  if (doError) {
    if (arguments.length > 1)
      er = arguments[1];
    if (er instanceof Error) {
      throw er; // Unhandled 'error' event
    } else {
      // At least give some kind of context to the user
      var err = new Error('Unhandled "error" event. (' + er + ')');
      err.context = er;
      throw err;
    }
    return false;
  }

  handler = events[type];

  if (!handler)
    return false;

  var isFn = typeof handler === 'function';
  len = arguments.length;
  switch (len) {
      // fast cases
    case 1:
      emitNone(handler, isFn, this);
      break;
    case 2:
      emitOne(handler, isFn, this, arguments[1]);
      break;
    case 3:
      emitTwo(handler, isFn, this, arguments[1], arguments[2]);
      break;
    case 4:
      emitThree(handler, isFn, this, arguments[1], arguments[2], arguments[3]);
      break;
      // slower
    default:
      args = new Array(len - 1);
      for (i = 1; i < len; i++)
        args[i - 1] = arguments[i];
      emitMany(handler, isFn, this, args);
  }

  return true;
};

function _addListener(target, type, listener, prepend) {
  var m;
  var events;
  var existing;

  if (typeof listener !== 'function')
    throw new TypeError('"listener" argument must be a function');

  events = target._events;
  if (!events) {
    events = target._events = objectCreate(null);
    target._eventsCount = 0;
  } else {
    // To avoid recursion in the case that type === "newListener"! Before
    // adding it to the listeners, first emit "newListener".
    if (events.newListener) {
      target.emit('newListener', type,
          listener.listener ? listener.listener : listener);

      // Re-assign `events` because a newListener handler could have caused the
      // this._events to be assigned to a new object
      events = target._events;
    }
    existing = events[type];
  }

  if (!existing) {
    // Optimize the case of one listener. Don't need the extra array object.
    existing = events[type] = listener;
    ++target._eventsCount;
  } else {
    if (typeof existing === 'function') {
      // Adding the second element, need to change to array.
      existing = events[type] =
          prepend ? [listener, existing] : [existing, listener];
    } else {
      // If we've already got an array, just append.
      if (prepend) {
        existing.unshift(listener);
      } else {
        existing.push(listener);
      }
    }

    // Check for listener leak
    if (!existing.warned) {
      m = $getMaxListeners(target);
      if (m && m > 0 && existing.length > m) {
        existing.warned = true;
        var w = new Error('Possible EventEmitter memory leak detected. ' +
            existing.length + ' "' + String(type) + '" listeners ' +
            'added. Use emitter.setMaxListeners() to ' +
            'increase limit.');
        w.name = 'MaxListenersExceededWarning';
        w.emitter = target;
        w.type = type;
        w.count = existing.length;
        if (typeof console === 'object' && console.warn) {
          console.warn('%s: %s', w.name, w.message);
        }
      }
    }
  }

  return target;
}

EventEmitter.prototype.addListener = function addListener(type, listener) {
  return _addListener(this, type, listener, false);
};

EventEmitter.prototype.on = EventEmitter.prototype.addListener;

EventEmitter.prototype.prependListener =
    function prependListener(type, listener) {
      return _addListener(this, type, listener, true);
    };

function onceWrapper() {
  if (!this.fired) {
    this.target.removeListener(this.type, this.wrapFn);
    this.fired = true;
    switch (arguments.length) {
      case 0:
        return this.listener.call(this.target);
      case 1:
        return this.listener.call(this.target, arguments[0]);
      case 2:
        return this.listener.call(this.target, arguments[0], arguments[1]);
      case 3:
        return this.listener.call(this.target, arguments[0], arguments[1],
            arguments[2]);
      default:
        var args = new Array(arguments.length);
        for (var i = 0; i < args.length; ++i)
          args[i] = arguments[i];
        this.listener.apply(this.target, args);
    }
  }
}

function _onceWrap(target, type, listener) {
  var state = { fired: false, wrapFn: undefined, target: target, type: type, listener: listener };
  var wrapped = bind.call(onceWrapper, state);
  wrapped.listener = listener;
  state.wrapFn = wrapped;
  return wrapped;
}

EventEmitter.prototype.once = function once(type, listener) {
  if (typeof listener !== 'function')
    throw new TypeError('"listener" argument must be a function');
  this.on(type, _onceWrap(this, type, listener));
  return this;
};

EventEmitter.prototype.prependOnceListener =
    function prependOnceListener(type, listener) {
      if (typeof listener !== 'function')
        throw new TypeError('"listener" argument must be a function');
      this.prependListener(type, _onceWrap(this, type, listener));
      return this;
    };

// Emits a 'removeListener' event if and only if the listener was removed.
EventEmitter.prototype.removeListener =
    function removeListener(type, listener) {
      var list, events, position, i, originalListener;

      if (typeof listener !== 'function')
        throw new TypeError('"listener" argument must be a function');

      events = this._events;
      if (!events)
        return this;

      list = events[type];
      if (!list)
        return this;

      if (list === listener || list.listener === listener) {
        if (--this._eventsCount === 0)
          this._events = objectCreate(null);
        else {
          delete events[type];
          if (events.removeListener)
            this.emit('removeListener', type, list.listener || listener);
        }
      } else if (typeof list !== 'function') {
        position = -1;

        for (i = list.length - 1; i >= 0; i--) {
          if (list[i] === listener || list[i].listener === listener) {
            originalListener = list[i].listener;
            position = i;
            break;
          }
        }

        if (position < 0)
          return this;

        if (position === 0)
          list.shift();
        else
          spliceOne(list, position);

        if (list.length === 1)
          events[type] = list[0];

        if (events.removeListener)
          this.emit('removeListener', type, originalListener || listener);
      }

      return this;
    };

EventEmitter.prototype.removeAllListeners =
    function removeAllListeners(type) {
      var listeners, events, i;

      events = this._events;
      if (!events)
        return this;

      // not listening for removeListener, no need to emit
      if (!events.removeListener) {
        if (arguments.length === 0) {
          this._events = objectCreate(null);
          this._eventsCount = 0;
        } else if (events[type]) {
          if (--this._eventsCount === 0)
            this._events = objectCreate(null);
          else
            delete events[type];
        }
        return this;
      }

      // emit removeListener for all listeners on all events
      if (arguments.length === 0) {
        var keys = objectKeys(events);
        var key;
        for (i = 0; i < keys.length; ++i) {
          key = keys[i];
          if (key === 'removeListener') continue;
          this.removeAllListeners(key);
        }
        this.removeAllListeners('removeListener');
        this._events = objectCreate(null);
        this._eventsCount = 0;
        return this;
      }

      listeners = events[type];

      if (typeof listeners === 'function') {
        this.removeListener(type, listeners);
      } else if (listeners) {
        // LIFO order
        for (i = listeners.length - 1; i >= 0; i--) {
          this.removeListener(type, listeners[i]);
        }
      }

      return this;
    };

function _listeners(target, type, unwrap) {
  var events = target._events;

  if (!events)
    return [];

  var evlistener = events[type];
  if (!evlistener)
    return [];

  if (typeof evlistener === 'function')
    return unwrap ? [evlistener.listener || evlistener] : [evlistener];

  return unwrap ? unwrapListeners(evlistener) : arrayClone(evlistener, evlistener.length);
}

EventEmitter.prototype.listeners = function listeners(type) {
  return _listeners(this, type, true);
};

EventEmitter.prototype.rawListeners = function rawListeners(type) {
  return _listeners(this, type, false);
};

EventEmitter.listenerCount = function(emitter, type) {
  if (typeof emitter.listenerCount === 'function') {
    return emitter.listenerCount(type);
  } else {
    return listenerCount.call(emitter, type);
  }
};

EventEmitter.prototype.listenerCount = listenerCount;
function listenerCount(type) {
  var events = this._events;

  if (events) {
    var evlistener = events[type];

    if (typeof evlistener === 'function') {
      return 1;
    } else if (evlistener) {
      return evlistener.length;
    }
  }

  return 0;
}

EventEmitter.prototype.eventNames = function eventNames() {
  return this._eventsCount > 0 ? Reflect.ownKeys(this._events) : [];
};

// About 1.5x faster than the two-arg version of Array#splice().
function spliceOne(list, index) {
  for (var i = index, k = i + 1, n = list.length; k < n; i += 1, k += 1)
    list[i] = list[k];
  list.pop();
}

function arrayClone(arr, n) {
  var copy = new Array(n);
  for (var i = 0; i < n; ++i)
    copy[i] = arr[i];
  return copy;
}

function unwrapListeners(arr) {
  var ret = new Array(arr.length);
  for (var i = 0; i < ret.length; ++i) {
    ret[i] = arr[i].listener || arr[i];
  }
  return ret;
}

function objectCreatePolyfill(proto) {
  var F = function() {};
  F.prototype = proto;
  return new F;
}
function objectKeysPolyfill(obj) {
  var keys = [];
  for (var k in obj) if (Object.prototype.hasOwnProperty.call(obj, k)) {
    keys.push(k);
  }
  return k;
}
function functionBindPolyfill(context) {
  var fn = this;
  return function () {
    return fn.apply(context, arguments);
  };
}

},{}],23:[function(require,module,exports){
/*! ieee754. BSD-3-Clause License. Feross Aboukhadijeh <https://feross.org/opensource> */
exports.read = function (buffer, offset, isLE, mLen, nBytes) {
  var e, m
  var eLen = (nBytes * 8) - mLen - 1
  var eMax = (1 << eLen) - 1
  var eBias = eMax >> 1
  var nBits = -7
  var i = isLE ? (nBytes - 1) : 0
  var d = isLE ? -1 : 1
  var s = buffer[offset + i]

  i += d

  e = s & ((1 << (-nBits)) - 1)
  s >>= (-nBits)
  nBits += eLen
  for (; nBits > 0; e = (e * 256) + buffer[offset + i], i += d, nBits -= 8) {}

  m = e & ((1 << (-nBits)) - 1)
  e >>= (-nBits)
  nBits += mLen
  for (; nBits > 0; m = (m * 256) + buffer[offset + i], i += d, nBits -= 8) {}

  if (e === 0) {
    e = 1 - eBias
  } else if (e === eMax) {
    return m ? NaN : ((s ? -1 : 1) * Infinity)
  } else {
    m = m + Math.pow(2, mLen)
    e = e - eBias
  }
  return (s ? -1 : 1) * m * Math.pow(2, e - mLen)
}

exports.write = function (buffer, value, offset, isLE, mLen, nBytes) {
  var e, m, c
  var eLen = (nBytes * 8) - mLen - 1
  var eMax = (1 << eLen) - 1
  var eBias = eMax >> 1
  var rt = (mLen === 23 ? Math.pow(2, -24) - Math.pow(2, -77) : 0)
  var i = isLE ? 0 : (nBytes - 1)
  var d = isLE ? 1 : -1
  var s = value < 0 || (value === 0 && 1 / value < 0) ? 1 : 0

  value = Math.abs(value)

  if (isNaN(value) || value === Infinity) {
    m = isNaN(value) ? 1 : 0
    e = eMax
  } else {
    e = Math.floor(Math.log(value) / Math.LN2)
    if (value * (c = Math.pow(2, -e)) < 1) {
      e--
      c *= 2
    }
    if (e + eBias >= 1) {
      value += rt / c
    } else {
      value += rt * Math.pow(2, 1 - eBias)
    }
    if (value * c >= 2) {
      e++
      c /= 2
    }

    if (e + eBias >= eMax) {
      m = 0
      e = eMax
    } else if (e + eBias >= 1) {
      m = ((value * c) - 1) * Math.pow(2, mLen)
      e = e + eBias
    } else {
      m = value * Math.pow(2, eBias - 1) * Math.pow(2, mLen)
      e = 0
    }
  }

  for (; mLen >= 8; buffer[offset + i] = m & 0xff, i += d, m /= 256, mLen -= 8) {}

  e = (e << mLen) | m
  eLen += mLen
  for (; eLen > 0; buffer[offset + i] = e & 0xff, i += d, e /= 256, eLen -= 8) {}

  buffer[offset + i - d] |= s * 128
}

},{}],24:[function(require,module,exports){
if (typeof Object.create === 'function') {
  // implementation from standard node.js 'util' module
  module.exports = function inherits(ctor, superCtor) {
    if (superCtor) {
      ctor.super_ = superCtor
      ctor.prototype = Object.create(superCtor.prototype, {
        constructor: {
          value: ctor,
          enumerable: false,
          writable: true,
          configurable: true
        }
      })
    }
  };
} else {
  // old school shim for old browsers
  module.exports = function inherits(ctor, superCtor) {
    if (superCtor) {
      ctor.super_ = superCtor
      var TempCtor = function () {}
      TempCtor.prototype = superCtor.prototype
      ctor.prototype = new TempCtor()
      ctor.prototype.constructor = ctor
    }
  }
}

},{}],25:[function(require,module,exports){
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var TreeNode = /** @class */ (function () {
    function TreeNode(key, value) {
        this.color = true;
        this.key = undefined;
        this.value = undefined;
        this.parent = undefined;
        this.brother = undefined;
        this.leftChild = undefined;
        this.rightChild = undefined;
        this.key = key;
        this.value = value;
    }
    TreeNode.prototype.rotateLeft = function () {
        var PP = this.parent;
        var PB = this.brother;
        var F = this.leftChild;
        var V = this.rightChild;
        if (!V)
            throw new Error("unknown error");
        var R = V.leftChild;
        var X = V.rightChild;
        if (PP) {
            if (PP.leftChild === this)
                PP.leftChild = V;
            else if (PP.rightChild === this)
                PP.rightChild = V;
        }
        V.parent = PP;
        V.brother = PB;
        V.leftChild = this;
        V.rightChild = X;
        if (PB)
            PB.brother = V;
        this.parent = V;
        this.brother = X;
        this.leftChild = F;
        this.rightChild = R;
        if (X) {
            X.parent = V;
            X.brother = this;
        }
        if (F) {
            F.parent = this;
            F.brother = R;
        }
        if (R) {
            R.parent = this;
            R.brother = F;
        }
        return V;
    };
    TreeNode.prototype.rotateRight = function () {
        var PP = this.parent;
        var PB = this.brother;
        var F = this.leftChild;
        if (!F)
            throw new Error("unknown error");
        var V = this.rightChild;
        var D = F.leftChild;
        var K = F.rightChild;
        if (PP) {
            if (PP.leftChild === this)
                PP.leftChild = F;
            else if (PP.rightChild === this)
                PP.rightChild = F;
        }
        F.parent = PP;
        F.brother = PB;
        F.leftChild = D;
        F.rightChild = this;
        if (PB)
            PB.brother = F;
        if (D) {
            D.parent = F;
            D.brother = this;
        }
        this.parent = F;
        this.brother = D;
        this.leftChild = K;
        this.rightChild = V;
        if (K) {
            K.parent = this;
            K.brother = V;
        }
        if (V) {
            V.parent = this;
            V.brother = K;
        }
        return F;
    };
    TreeNode.prototype.remove = function () {
        if (this.leftChild || this.rightChild)
            throw new Error("can only remove leaf node");
        if (this.parent) {
            if (this === this.parent.leftChild)
                this.parent.leftChild = undefined;
            else if (this === this.parent.rightChild)
                this.parent.rightChild = undefined;
        }
        if (this.brother)
            this.brother.brother = undefined;
        this.key = undefined;
        this.value = undefined;
        this.parent = undefined;
        this.brother = undefined;
    };
    TreeNode.TreeNodeColorType = {
        red: true,
        black: false
    };
    return TreeNode;
}());
Object.freeze(TreeNode);
exports.default = TreeNode;

},{}],26:[function(require,module,exports){
"use strict";
var __generator = (this && this.__generator) || function (thisArg, body) {
    var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
    return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
    function verb(n) { return function (v) { return step([n, v]); }; }
    function step(op) {
        if (f) throw new TypeError("Generator is already executing.");
        while (_) try {
            if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
            if (y = 0, t) op = [op[0] & 2, t.value];
            switch (op[0]) {
                case 0: case 1: t = op; break;
                case 4: _.label++; return { value: op[1], done: false };
                case 5: _.label++; y = op[1]; op = [0]; continue;
                case 7: op = _.ops.pop(); _.trys.pop(); continue;
                default:
                    if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
                    if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
                    if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
                    if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
                    if (t[2]) _.ops.pop();
                    _.trys.pop(); continue;
            }
            op = body.call(thisArg, _);
        } catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
        if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
    }
};
Object.defineProperty(exports, "__esModule", { value: true });
Deque.sigma = 3; // growth factor
Deque.bucketSize = 5000;
function Deque(container) {
    var _this = this;
    if (container === void 0) { container = []; }
    var map = [];
    var first = 0;
    var curFirst = 0;
    var last = 0;
    var curLast = 0;
    var bucketNum = 0;
    var len = 0;
    this.size = function () {
        return len;
    };
    this.empty = function () {
        return len === 0;
    };
    this.clear = function () {
        first = last = curFirst = curLast = bucketNum = len = 0;
        reAllocate.call(this, Deque.bucketSize);
        len = 0;
    };
    this.front = function () {
        return map[first][curFirst];
    };
    this.back = function () {
        return map[last][curLast];
    };
    this.forEach = function (callback) {
        if (this.empty())
            return;
        var index = 0;
        if (first === last) {
            for (var i = curFirst; i <= curLast; ++i) {
                callback(map[first][i], index++);
            }
            return;
        }
        for (var i = curFirst; i < Deque.bucketSize; ++i) {
            callback(map[first][i], index++);
        }
        for (var i = first + 1; i < last; ++i) {
            for (var j = 0; j < Deque.bucketSize; ++j) {
                callback(map[i][j], index++);
            }
        }
        for (var i = 0; i <= curLast; ++i) {
            callback(map[last][i], index++);
        }
    };
    var getElementIndex = function (pos) {
        var curFirstIndex = first * Deque.bucketSize + curFirst;
        var curNodeIndex = curFirstIndex + pos;
        var curLastIndex = last * Deque.bucketSize + curLast;
        if (curNodeIndex < curFirstIndex || curNodeIndex > curLastIndex)
            throw new Error("pos should more than 0 and less than queue's size");
        var curNodeBucketIndex = Math.floor(curNodeIndex / Deque.bucketSize);
        var curNodePointerIndex = curNodeIndex % Deque.bucketSize;
        return { curNodeBucketIndex: curNodeBucketIndex, curNodePointerIndex: curNodePointerIndex };
    };
    /**
     * @param pos index from 0 to size - 1
     */
    this.getElementByPos = function (pos) {
        var _a = getElementIndex(pos), curNodeBucketIndex = _a.curNodeBucketIndex, curNodePointerIndex = _a.curNodePointerIndex;
        return map[curNodeBucketIndex][curNodePointerIndex];
    };
    this.eraseElementByPos = function (pos) {
        var _this = this;
        if (pos < 0 || pos > len)
            throw new Error("pos should more than 0 and less than queue's size");
        if (pos === 0)
            this.popFront();
        else if (pos === this.size())
            this.popBack();
        else {
            var arr = [];
            for (var i = pos + 1; i < len; ++i) {
                arr.push(this.getElementByPos(i));
            }
            this.cut(pos);
            this.popBack();
            arr.forEach(function (element) { return _this.pushBack(element); });
        }
    };
    this.eraseElementByValue = function (value) {
        if (this.empty())
            return;
        var arr = [];
        this.forEach(function (element) {
            if (element !== value) {
                arr.push(element);
            }
        });
        var _len = arr.length;
        for (var i = 0; i < _len; ++i)
            this.setElementByPos(i, arr[i]);
        this.cut(_len - 1);
    };
    var reAllocate = function (originalSize) {
        var newMap = [];
        var needSize = originalSize * Deque.sigma;
        var newBucketNum = Math.max(Math.ceil(needSize / Deque.bucketSize), 2);
        for (var i = 0; i < newBucketNum; ++i) {
            newMap.push(new Array(Deque.bucketSize));
        }
        var needBucketNum = Math.ceil(originalSize / Deque.bucketSize);
        var newFirst = Math.floor(newBucketNum / 2) - Math.floor(needBucketNum / 2);
        var newLast = newFirst, newCurLast = 0;
        if (this.size()) {
            for (var i = 0; i < needBucketNum; ++i) {
                for (var j = 0; j < Deque.bucketSize; ++j) {
                    newMap[newFirst + i][j] = this.front();
                    this.popFront();
                    if (this.empty()) {
                        newLast = newFirst + i;
                        newCurLast = j;
                        break;
                    }
                }
                if (this.empty())
                    break;
            }
        }
        map = newMap;
        first = newFirst;
        curFirst = 0;
        last = newLast;
        curLast = newCurLast;
        bucketNum = newBucketNum;
        len = originalSize;
    };
    this.pushBack = function (element) {
        if (!this.empty()) {
            if (last === bucketNum - 1 && curLast === Deque.bucketSize - 1) {
                reAllocate.call(this, this.size());
            }
            if (curLast < Deque.bucketSize - 1) {
                ++curLast;
            }
            else if (last < bucketNum - 1) {
                ++last;
                curLast = 0;
            }
        }
        ++len;
        map[last][curLast] = element;
    };
    this.popBack = function () {
        if (this.empty())
            return;
        if (this.size() !== 1) {
            if (curLast > 0) {
                --curLast;
            }
            else if (first < last) {
                --last;
                curLast = Deque.bucketSize - 1;
            }
        }
        if (len > 0)
            --len;
    };
    this.setElementByPos = function (pos, element) {
        var _a = getElementIndex(pos), curNodeBucketIndex = _a.curNodeBucketIndex, curNodePointerIndex = _a.curNodePointerIndex;
        map[curNodeBucketIndex][curNodePointerIndex] = element;
    };
    /**
     * @param {number} pos insert element before pos, should in [0, queue.size]
     * @param {any} element the element you want to insert
     * @param {number} [num = 1] the nums you want to insert
     */
    this.insert = function (pos, element, num) {
        var _this = this;
        if (num === void 0) { num = 1; }
        if (pos === 0) {
            while (num--)
                this.pushFront(element);
        }
        else if (pos === this.size()) {
            while (num--)
                this.pushBack(element);
        }
        else {
            var arr = [];
            for (var i = pos; i < len; ++i) {
                arr.push(this.getElementByPos(i));
            }
            this.cut(pos - 1);
            for (var i = 0; i < num; ++i)
                this.pushBack(element);
            arr.forEach(function (element) { return _this.pushBack(element); });
        }
    };
    this.find = function (element) {
        if (first === last) {
            for (var i = curFirst; i <= curLast; ++i) {
                if (map[first][i] === element)
                    return true;
            }
            return false;
        }
        for (var i = curFirst; i < Deque.bucketSize; ++i) {
            if (map[first][i] === element)
                return true;
        }
        for (var i = first + 1; i < last; ++i) {
            for (var j = 0; j < Deque.bucketSize; ++j) {
                if (map[i][j] === element)
                    return true;
            }
        }
        for (var i = 0; i <= curLast; ++i) {
            if (map[last][i] === element)
                return true;
        }
        return false;
    };
    this.reverse = function () {
        var l = 0, r = len - 1;
        while (l < r) {
            var tmp = this.getElementByPos(l);
            this.setElementByPos(l, this.getElementByPos(r));
            this.setElementByPos(r, tmp);
            ++l;
            --r;
        }
    };
    this.unique = function () {
        if (this.empty())
            return;
        var arr = [];
        var pre = this.front();
        this.forEach(function (element, index) {
            if (index === 0 || element !== pre) {
                arr.push(element);
                pre = element;
            }
        });
        for (var i = 0; i < len; ++i) {
            this.setElementByPos(i, arr[i]);
        }
        this.cut(arr.length - 1);
    };
    this.sort = function (cmp) {
        var arr = [];
        this.forEach(function (element) {
            arr.push(element);
        });
        arr.sort(cmp);
        for (var i = 0; i < len; ++i)
            this.setElementByPos(i, arr[i]);
    };
    this.pushFront = function (element) {
        if (!this.empty()) {
            if (first === 0 && curFirst === 0) {
                reAllocate.call(this, this.size());
            }
            if (curFirst > 0) {
                --curFirst;
            }
            else if (first > 0) {
                --first;
                curFirst = Deque.bucketSize - 1;
            }
        }
        ++len;
        map[first][curFirst] = element;
    };
    this.popFront = function () {
        if (this.empty())
            return;
        if (this.size() !== 1) {
            if (curFirst < Deque.bucketSize - 1) {
                ++curFirst;
            }
            else if (first < last) {
                ++first;
                curFirst = 0;
            }
        }
        if (len > 0)
            --len;
    };
    /**
     * reduces memory usage by freeing unused memory
     */
    this.shrinkToFit = function () {
        var _this = this;
        var arr = [];
        this.forEach(function (element) {
            arr.push(element);
        });
        var _len = arr.length;
        map = [];
        var bucketNum = Math.ceil(_len / Deque.bucketSize);
        for (var i = 0; i < bucketNum; ++i) {
            map.push(new Array(Deque.bucketSize));
        }
        this.clear();
        arr.forEach(function (element) { return _this.pushBack(element); });
    };
    /**
     * @param pos cut elements after pos
     */
    this.cut = function (pos) {
        if (pos < 0) {
            this.clear();
            return;
        }
        var _a = getElementIndex(pos), curNodeBucketIndex = _a.curNodeBucketIndex, curNodePointerIndex = _a.curNodePointerIndex;
        last = curNodeBucketIndex;
        curLast = curNodePointerIndex;
        len = pos + 1;
    };
    this[Symbol.iterator] = function () {
        return (function () {
            var i, i, i, j, i;
            return __generator(this, function (_a) {
                switch (_a.label) {
                    case 0:
                        if (len === 0)
                            return [2 /*return*/];
                        if (!(first === last)) return [3 /*break*/, 5];
                        i = curFirst;
                        _a.label = 1;
                    case 1:
                        if (!(i <= curLast)) return [3 /*break*/, 4];
                        return [4 /*yield*/, map[first][i]];
                    case 2:
                        _a.sent();
                        _a.label = 3;
                    case 3:
                        ++i;
                        return [3 /*break*/, 1];
                    case 4: return [2 /*return*/];
                    case 5:
                        i = curFirst;
                        _a.label = 6;
                    case 6:
                        if (!(i < Deque.bucketSize)) return [3 /*break*/, 9];
                        return [4 /*yield*/, map[first][i]];
                    case 7:
                        _a.sent();
                        _a.label = 8;
                    case 8:
                        ++i;
                        return [3 /*break*/, 6];
                    case 9:
                        i = first + 1;
                        _a.label = 10;
                    case 10:
                        if (!(i < last)) return [3 /*break*/, 15];
                        j = 0;
                        _a.label = 11;
                    case 11:
                        if (!(j < Deque.bucketSize)) return [3 /*break*/, 14];
                        return [4 /*yield*/, map[i][j]];
                    case 12:
                        _a.sent();
                        _a.label = 13;
                    case 13:
                        ++j;
                        return [3 /*break*/, 11];
                    case 14:
                        ++i;
                        return [3 /*break*/, 10];
                    case 15:
                        i = 0;
                        _a.label = 16;
                    case 16:
                        if (!(i <= curLast)) return [3 /*break*/, 19];
                        return [4 /*yield*/, map[last][i]];
                    case 17:
                        _a.sent();
                        _a.label = 18;
                    case 18:
                        ++i;
                        return [3 /*break*/, 16];
                    case 19: return [2 /*return*/];
                }
            });
        })();
    };
    (function () {
        var _len = Deque.bucketSize;
        if (container.size) {
            _len = container.size();
        }
        else if (container.length) {
            _len = container.length;
        }
        var needSize = _len * Deque.sigma;
        bucketNum = Math.ceil(needSize / Deque.bucketSize);
        bucketNum = Math.max(bucketNum, 3);
        for (var i = 0; i < bucketNum; ++i) {
            map.push(new Array(Deque.bucketSize));
        }
        var needBucketNum = Math.ceil(_len / Deque.bucketSize);
        first = Math.floor(bucketNum / 2) - Math.floor(needBucketNum / 2);
        last = first;
        container.forEach(function (element) { return _this.pushBack(element); });
    })();
    Object.freeze(this);
}
Object.freeze(Deque);
exports.default = Deque;

},{}],27:[function(require,module,exports){
"use strict";
var __generator = (this && this.__generator) || function (thisArg, body) {
    var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
    return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
    function verb(n) { return function (v) { return step([n, v]); }; }
    function step(op) {
        if (f) throw new TypeError("Generator is already executing.");
        while (_) try {
            if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
            if (y = 0, t) op = [op[0] & 2, t.value];
            switch (op[0]) {
                case 0: case 1: t = op; break;
                case 4: _.label++; return { value: op[1], done: false };
                case 5: _.label++; y = op[1]; op = [0]; continue;
                case 7: op = _.ops.pop(); _.trys.pop(); continue;
                default:
                    if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
                    if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
                    if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
                    if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
                    if (t[2]) _.ops.pop();
                    _.trys.pop(); continue;
            }
            op = body.call(thisArg, _);
        } catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
        if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
    }
};
var __values = (this && this.__values) || function(o) {
    var s = typeof Symbol === "function" && Symbol.iterator, m = s && o[s], i = 0;
    if (m) return m.call(o);
    if (o && typeof o.length === "number") return {
        next: function () {
            if (o && i >= o.length) o = void 0;
            return { value: o && o[i++], done: !o };
        }
    };
    throw new TypeError(s ? "Object is not iterable." : "Symbol.iterator is not defined.");
};
Object.defineProperty(exports, "__esModule", { value: true });
var LinkList_1 = require("../LinkList/LinkList");
var Map_1 = require("../Map/Map");
HashMap.initSize = (1 << 4);
HashMap.maxSize = (1 << 30);
HashMap.sigma = 0.75; // default load factor
HashMap.treeifyThreshold = 8;
HashMap.untreeifyThreshold = 6;
HashMap.minTreeifySize = 64;
/**
 * Note that resize is a time-consuming operation, please try to determine the number of buckets before use.
 * @param container Initialize the container
 * @param initBucketNum Initialize the bucket num, must be 2 to the power of n
 * @param hashFunc Function to map elements to numbers
 * @constructor
 */
function HashMap(container, initBucketNum, hashFunc) {
    var _this = this;
    if (container === void 0) { container = []; }
    if (initBucketNum === void 0) { initBucketNum = HashMap.initSize; }
    hashFunc = hashFunc || (function (x) {
        var e_1, _a;
        var hashCode = 0;
        var str = '';
        if (typeof x === "number") {
            hashCode = Math.floor(x);
            hashCode = ((hashCode << 5) - hashCode);
            hashCode = hashCode & hashCode;
        }
        else {
            if (typeof x !== "string") {
                str = JSON.stringify(x);
            }
            else
                str = x;
            try {
                for (var str_1 = __values(str), str_1_1 = str_1.next(); !str_1_1.done; str_1_1 = str_1.next()) {
                    var ch = str_1_1.value;
                    var character = ch.charCodeAt(0);
                    hashCode = ((hashCode << 5) - hashCode) + character;
                    hashCode = hashCode & hashCode;
                }
            }
            catch (e_1_1) { e_1 = { error: e_1_1 }; }
            finally {
                try {
                    if (str_1_1 && !str_1_1.done && (_a = str_1.return)) _a.call(str_1);
                }
                finally { if (e_1) throw e_1.error; }
            }
        }
        hashCode ^= (hashCode >>> 16);
        return hashCode;
    });
    if ((initBucketNum & (initBucketNum - 1)) !== 0) {
        throw new Error("initBucketNum must be 2 to the power of n");
    }
    var len = 0;
    var hashTable = [];
    var bucketNum = Math.max(HashMap.initSize, Math.min(HashMap.maxSize, initBucketNum));
    this.size = function () {
        return len;
    };
    this.empty = function () {
        return len === 0;
    };
    this.clear = function () {
        len = 0;
        bucketNum = initBucketNum;
        hashTable = [];
    };
    this.forEach = function (callback) {
        var index = 0;
        hashTable.forEach(function (container) {
            container.forEach(function (element) {
                callback(element, index++);
            });
        });
    };
    var reAllocate = function (originalBucketNum) {
        if (originalBucketNum >= HashMap.maxSize)
            return;
        bucketNum = originalBucketNum * 2;
        var newHashTable = [];
        hashTable.forEach(function (container, index) {
            if (container.empty())
                return;
            if (container instanceof LinkList_1.default && container.size() === 1) {
                var _a = container.front(), key = _a.key, value = _a.value;
                newHashTable[hashFunc(key) & (bucketNum - 1)] = new LinkList_1.default([{
                        key: key,
                        value: value
                    }]);
            }
            else if (container instanceof Map_1.default) {
                var lowList_1 = new LinkList_1.default();
                var highList_1 = new LinkList_1.default();
                container.forEach(function (pair) {
                    var hashCode = hashFunc(pair.key);
                    if ((hashCode & originalBucketNum) === 0) {
                        lowList_1.pushBack(pair);
                    }
                    else
                        highList_1.pushBack(pair);
                });
                if (lowList_1.size() > HashMap.untreeifyThreshold)
                    newHashTable[index] = new Map_1.default(lowList_1);
                else if (lowList_1.size())
                    newHashTable[index] = lowList_1;
                if (highList_1.size() > HashMap.untreeifyThreshold)
                    newHashTable[index + originalBucketNum] = new Map_1.default(highList_1);
                else if (highList_1.size())
                    newHashTable[index + originalBucketNum] = highList_1;
            }
            else {
                var lowList_2 = new LinkList_1.default();
                var highList_2 = new LinkList_1.default();
                container.forEach(function (pair) {
                    var hashCode = hashFunc(pair.key);
                    if ((hashCode & originalBucketNum) === 0) {
                        lowList_2.pushBack(pair);
                    }
                    else
                        highList_2.pushBack(pair);
                });
                if (lowList_2.size())
                    newHashTable[index] = lowList_2;
                if (highList_2.size())
                    newHashTable[index + originalBucketNum] = highList_2;
            }
            hashTable[index].clear();
        });
        hashTable = newHashTable;
    };
    this.setElement = function (key, value) {
        var e_2, _a;
        if (key === null || key === undefined) {
            throw new Error("to avoid some unnecessary errors, we don't suggest you insert null or undefined here");
        }
        if (value === null || value === undefined) {
            this.eraseElementByKey(key);
            return;
        }
        var index = hashFunc(key) & (bucketNum - 1);
        if (!hashTable[index]) {
            ++len;
            hashTable[index] = new LinkList_1.default([{ key: key, value: value }]);
        }
        else {
            var preSize = hashTable[index].size();
            if (hashTable[index] instanceof LinkList_1.default) {
                try {
                    for (var _b = __values(hashTable[index]), _c = _b.next(); !_c.done; _c = _b.next()) {
                        var pair = _c.value;
                        if (pair.key === key) {
                            pair.value = value;
                            return;
                        }
                    }
                }
                catch (e_2_1) { e_2 = { error: e_2_1 }; }
                finally {
                    try {
                        if (_c && !_c.done && (_a = _b.return)) _a.call(_b);
                    }
                    finally { if (e_2) throw e_2.error; }
                }
                hashTable[index].pushBack({
                    key: key,
                    value: value,
                });
                if (hashTable[index].size() >= HashMap.treeifyThreshold) {
                    hashTable[index] = new Map_1.default(hashTable[index]);
                }
            }
            else
                hashTable[index].setElement(key, value);
            var curSize = hashTable[index].size();
            len += curSize - preSize;
        }
        if (len > bucketNum * HashMap.sigma) {
            reAllocate.call(this, bucketNum);
        }
    };
    this.getElementByKey = function (key) {
        var e_3, _a;
        var index = hashFunc(key) & (bucketNum - 1);
        if (!hashTable[index])
            return undefined;
        if (hashTable[index] instanceof Map_1.default)
            return hashTable[index].getElementByKey(key);
        else {
            try {
                for (var _b = __values(hashTable[index]), _c = _b.next(); !_c.done; _c = _b.next()) {
                    var pair = _c.value;
                    if (pair.key === key)
                        return pair.value;
                }
            }
            catch (e_3_1) { e_3 = { error: e_3_1 }; }
            finally {
                try {
                    if (_c && !_c.done && (_a = _b.return)) _a.call(_b);
                }
                finally { if (e_3) throw e_3.error; }
            }
            return undefined;
        }
    };
    this.eraseElementByKey = function (key) {
        var e_4, _a;
        var index = hashFunc(key) & (bucketNum - 1);
        if (!hashTable[index])
            return;
        var preSize = hashTable[index].size();
        if (hashTable[index] instanceof Map_1.default) {
            hashTable[index].eraseElementByKey(key);
            if (hashTable[index].size() <= HashMap.untreeifyThreshold) {
                hashTable[index] = new LinkList_1.default(hashTable[index]);
            }
        }
        else {
            var pos = -1;
            try {
                for (var _b = __values(hashTable[index]), _c = _b.next(); !_c.done; _c = _b.next()) {
                    var pair = _c.value;
                    ++pos;
                    if (pair.key === key) {
                        hashTable[index].eraseElementByPos(pos);
                        break;
                    }
                }
            }
            catch (e_4_1) { e_4 = { error: e_4_1 }; }
            finally {
                try {
                    if (_c && !_c.done && (_a = _b.return)) _a.call(_b);
                }
                finally { if (e_4) throw e_4.error; }
            }
        }
        var curSize = hashTable[index].size();
        len += curSize - preSize;
    };
    this.find = function (key) {
        var e_5, _a;
        var index = hashFunc(key) & (bucketNum - 1);
        if (!hashTable[index])
            return false;
        if (hashTable[index] instanceof Map_1.default)
            return hashTable[index].find(key);
        try {
            for (var _b = __values(hashTable[index]), _c = _b.next(); !_c.done; _c = _b.next()) {
                var pair = _c.value;
                if (pair.key === key)
                    return true;
            }
        }
        catch (e_5_1) { e_5 = { error: e_5_1 }; }
        finally {
            try {
                if (_c && !_c.done && (_a = _b.return)) _a.call(_b);
            }
            finally { if (e_5) throw e_5.error; }
        }
        return false;
    };
    this[Symbol.iterator] = function () {
        return (function () {
            var index, _a, _b, pair, e_6_1;
            var e_6, _c;
            return __generator(this, function (_d) {
                switch (_d.label) {
                    case 0:
                        index = 0;
                        _d.label = 1;
                    case 1:
                        if (!(index < bucketNum)) return [3 /*break*/, 10];
                        while (index < bucketNum && !hashTable[index])
                            ++index;
                        if (index >= bucketNum)
                            return [3 /*break*/, 10];
                        _d.label = 2;
                    case 2:
                        _d.trys.push([2, 7, 8, 9]);
                        _a = (e_6 = void 0, __values(hashTable[index])), _b = _a.next();
                        _d.label = 3;
                    case 3:
                        if (!!_b.done) return [3 /*break*/, 6];
                        pair = _b.value;
                        return [4 /*yield*/, pair];
                    case 4:
                        _d.sent();
                        _d.label = 5;
                    case 5:
                        _b = _a.next();
                        return [3 /*break*/, 3];
                    case 6: return [3 /*break*/, 9];
                    case 7:
                        e_6_1 = _d.sent();
                        e_6 = { error: e_6_1 };
                        return [3 /*break*/, 9];
                    case 8:
                        try {
                            if (_b && !_b.done && (_c = _a.return)) _c.call(_a);
                        }
                        finally { if (e_6) throw e_6.error; }
                        return [7 /*endfinally*/];
                    case 9:
                        ++index;
                        return [3 /*break*/, 1];
                    case 10: return [2 /*return*/];
                }
            });
        })();
    };
    container.forEach(function (_a) {
        var key = _a.key, value = _a.value;
        return _this.setElement(key, value);
    });
    Object.freeze(this);
}
Object.freeze(HashMap);
exports.default = HashMap;

},{"../LinkList/LinkList":29,"../Map/Map":30}],28:[function(require,module,exports){
"use strict";
var __generator = (this && this.__generator) || function (thisArg, body) {
    var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
    return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
    function verb(n) { return function (v) { return step([n, v]); }; }
    function step(op) {
        if (f) throw new TypeError("Generator is already executing.");
        while (_) try {
            if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
            if (y = 0, t) op = [op[0] & 2, t.value];
            switch (op[0]) {
                case 0: case 1: t = op; break;
                case 4: _.label++; return { value: op[1], done: false };
                case 5: _.label++; y = op[1]; op = [0]; continue;
                case 7: op = _.ops.pop(); _.trys.pop(); continue;
                default:
                    if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
                    if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
                    if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
                    if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
                    if (t[2]) _.ops.pop();
                    _.trys.pop(); continue;
            }
            op = body.call(thisArg, _);
        } catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
        if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
    }
};
var __values = (this && this.__values) || function(o) {
    var s = typeof Symbol === "function" && Symbol.iterator, m = s && o[s], i = 0;
    if (m) return m.call(o);
    if (o && typeof o.length === "number") return {
        next: function () {
            if (o && i >= o.length) o = void 0;
            return { value: o && o[i++], done: !o };
        }
    };
    throw new TypeError(s ? "Object is not iterable." : "Symbol.iterator is not defined.");
};
Object.defineProperty(exports, "__esModule", { value: true });
var Set_1 = require("../Set/Set");
var LinkList_1 = require("../LinkList/LinkList");
HashSet.initSize = (1 << 4);
HashSet.maxSize = (1 << 30);
HashSet.sigma = 0.75; // default load factor
HashSet.treeifyThreshold = 8;
HashSet.untreeifyThreshold = 6;
HashSet.minTreeifySize = 64;
/**
 * Note that resize is a time-consuming operation, please try to determine the number of buckets before use.
 * @param container Initialize the container
 * @param initBucketNum Initialize the bucket num
 * @param hashFunc Function to map elements to numbers
 * @constructor
 */
function HashSet(container, initBucketNum, hashFunc) {
    var _this = this;
    if (container === void 0) { container = []; }
    if (initBucketNum === void 0) { initBucketNum = HashSet.initSize; }
    hashFunc = hashFunc || (function (x) {
        var hashCode = 0;
        var str = '';
        if (typeof x === "number") {
            hashCode = Math.floor(x);
            hashCode = ((hashCode << 5) - hashCode);
            hashCode = hashCode & hashCode;
        }
        else {
            if (typeof x !== "string") {
                str = JSON.stringify(x);
            }
            else
                str = x;
            for (var i = 0; i < str.length; i++) {
                var character = str.charCodeAt(i);
                hashCode = ((hashCode << 5) - hashCode) + character;
                hashCode = hashCode & hashCode;
            }
        }
        hashCode ^= (hashCode >>> 16);
        return hashCode;
    });
    if ((initBucketNum & (initBucketNum - 1)) !== 0) {
        throw new Error("initBucketNum must be 2 to the power of n");
    }
    var len = 0;
    var hashTable = [];
    var bucketNum = Math.max(HashSet.initSize, Math.min(HashSet.maxSize, initBucketNum));
    this.size = function () {
        return len;
    };
    this.empty = function () {
        return len === 0;
    };
    this.clear = function () {
        len = 0;
        bucketNum = initBucketNum;
        hashTable = [];
    };
    this.forEach = function (callback) {
        var index = 0;
        hashTable.forEach(function (container) {
            container.forEach(function (element) {
                callback(element, index++);
            });
        });
    };
    var reAllocate = function (originalBucketNum) {
        if (originalBucketNum >= HashSet.maxSize)
            return;
        bucketNum = originalBucketNum * 2;
        var newHashTable = [];
        hashTable.forEach(function (container, index) {
            if (container.empty())
                return;
            if (container instanceof LinkList_1.default && container.size() === 1) {
                var element = container.front();
                if (element === undefined)
                    throw new Error("unknown error");
                newHashTable[hashFunc(element) & (bucketNum - 1)] = new LinkList_1.default([element]);
            }
            else if (container instanceof Set_1.default) {
                var lowList_1 = new LinkList_1.default();
                var highList_1 = new LinkList_1.default();
                container.forEach(function (element) {
                    var hashCode = hashFunc(element);
                    if ((hashCode & originalBucketNum) === 0) {
                        lowList_1.pushBack(element);
                    }
                    else
                        highList_1.pushBack(element);
                });
                if (lowList_1.size() > HashSet.untreeifyThreshold)
                    newHashTable[index] = new Set_1.default(lowList_1);
                else if (lowList_1.size())
                    newHashTable[index] = lowList_1;
                if (highList_1.size() > HashSet.untreeifyThreshold)
                    newHashTable[index + originalBucketNum] = new Set_1.default(highList_1);
                else if (highList_1.size())
                    newHashTable[index + originalBucketNum] = highList_1;
            }
            else {
                var lowList_2 = new LinkList_1.default();
                var highList_2 = new LinkList_1.default();
                container.forEach(function (element) {
                    var hashCode = hashFunc(element);
                    if ((hashCode & originalBucketNum) === 0) {
                        lowList_2.pushBack(element);
                    }
                    else
                        highList_2.pushBack(element);
                });
                if (lowList_2.size())
                    newHashTable[index] = lowList_2;
                if (highList_2.size())
                    newHashTable[index + originalBucketNum] = highList_2;
            }
            hashTable[index].clear();
        });
        hashTable = newHashTable;
    };
    this.insert = function (element) {
        if (element === null || element === undefined) {
            throw new Error("to avoid some unnecessary errors, we don't suggest you insert null or undefined here");
        }
        var index = hashFunc(element) & (bucketNum - 1);
        if (!hashTable[index]) {
            hashTable[index] = new LinkList_1.default([element]);
            ++len;
        }
        else {
            var preSize = hashTable[index].size();
            if (hashTable[index] instanceof LinkList_1.default) {
                if (hashTable[index].find(element))
                    return;
                hashTable[index].pushBack(element);
                if (hashTable[index].size() >= HashSet.treeifyThreshold) {
                    hashTable[index] = new Set_1.default(hashTable[index]);
                }
            }
            else
                hashTable[index].insert(element);
            var curSize = hashTable[index].size();
            len += curSize - preSize;
        }
        if (len > bucketNum * HashSet.sigma) {
            reAllocate.call(this, bucketNum);
        }
    };
    this.eraseElementByValue = function (element) {
        var index = hashFunc(element) & (bucketNum - 1);
        if (!hashTable[index])
            return;
        var preSize = hashTable[index].size();
        hashTable[index].eraseElementByValue(element);
        if (hashTable[index] instanceof Set_1.default) {
            if (hashTable[index].size() <= HashSet.untreeifyThreshold) {
                hashTable[index] = new LinkList_1.default(hashTable[index]);
            }
        }
        var curSize = hashTable[index].size();
        len += curSize - preSize;
    };
    this.find = function (element) {
        var index = hashFunc(element) & (bucketNum - 1);
        if (!hashTable[index])
            return false;
        return hashTable[index].find(element);
    };
    this[Symbol.iterator] = function () {
        return (function () {
            var index, _a, _b, element, e_1_1;
            var e_1, _c;
            return __generator(this, function (_d) {
                switch (_d.label) {
                    case 0:
                        index = 0;
                        _d.label = 1;
                    case 1:
                        if (!(index < bucketNum)) return [3 /*break*/, 10];
                        while (index < bucketNum && !hashTable[index])
                            ++index;
                        if (index >= bucketNum)
                            return [3 /*break*/, 10];
                        _d.label = 2;
                    case 2:
                        _d.trys.push([2, 7, 8, 9]);
                        _a = (e_1 = void 0, __values(hashTable[index])), _b = _a.next();
                        _d.label = 3;
                    case 3:
                        if (!!_b.done) return [3 /*break*/, 6];
                        element = _b.value;
                        return [4 /*yield*/, element];
                    case 4:
                        _d.sent();
                        _d.label = 5;
                    case 5:
                        _b = _a.next();
                        return [3 /*break*/, 3];
                    case 6: return [3 /*break*/, 9];
                    case 7:
                        e_1_1 = _d.sent();
                        e_1 = { error: e_1_1 };
                        return [3 /*break*/, 9];
                    case 8:
                        try {
                            if (_b && !_b.done && (_c = _a.return)) _c.call(_a);
                        }
                        finally { if (e_1) throw e_1.error; }
                        return [7 /*endfinally*/];
                    case 9:
                        ++index;
                        return [3 /*break*/, 1];
                    case 10: return [2 /*return*/];
                }
            });
        })();
    };
    container.forEach(function (element) { return _this.insert(element); });
    Object.freeze(this);
}
Object.freeze(HashSet);
exports.default = HashSet;

},{"../LinkList/LinkList":29,"../Set/Set":33}],29:[function(require,module,exports){
"use strict";
var __generator = (this && this.__generator) || function (thisArg, body) {
    var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
    return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
    function verb(n) { return function (v) { return step([n, v]); }; }
    function step(op) {
        if (f) throw new TypeError("Generator is already executing.");
        while (_) try {
            if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
            if (y = 0, t) op = [op[0] & 2, t.value];
            switch (op[0]) {
                case 0: case 1: t = op; break;
                case 4: _.label++; return { value: op[1], done: false };
                case 5: _.label++; y = op[1]; op = [0]; continue;
                case 7: op = _.ops.pop(); _.trys.pop(); continue;
                default:
                    if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
                    if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
                    if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
                    if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
                    if (t[2]) _.ops.pop();
                    _.trys.pop(); continue;
            }
            op = body.call(thisArg, _);
        } catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
        if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
    }
};
Object.defineProperty(exports, "__esModule", { value: true });
var LinkNode = /** @class */ (function () {
    function LinkNode(element) {
        this.value = undefined;
        this.pre = undefined;
        this.next = undefined;
        this.value = element;
    }
    return LinkNode;
}());
function LinkList(container) {
    var _this = this;
    if (container === void 0) { container = []; }
    var len = 0;
    var head = undefined;
    var tail = undefined;
    this.size = function () {
        return len;
    };
    this.empty = function () {
        return len === 0;
    };
    this.clear = function () {
        head = tail = undefined;
        len = 0;
    };
    this.front = function () {
        return head === null || head === void 0 ? void 0 : head.value;
    };
    this.back = function () {
        return tail === null || tail === void 0 ? void 0 : tail.value;
    };
    this.forEach = function (callback) {
        var curNode = head;
        var index = 0;
        while (curNode) {
            if (curNode.value === undefined)
                throw new Error("unknown error");
            callback(curNode.value, index++);
            curNode = curNode.next;
        }
    };
    this.getElementByPos = function (pos) {
        if (pos < 0 || pos >= len)
            throw new Error("pos must more then 0 and less then the list length");
        var curNode = head;
        while (pos--) {
            if (!curNode)
                break;
            curNode = curNode.next;
        }
        if (!curNode || curNode.value === undefined)
            throw new Error("unknown error");
        return curNode.value;
    };
    this.eraseElementByPos = function (pos) {
        if (pos < 0 || pos >= len)
            throw new Error("erase pos must more then 0 and less then the list length");
        if (pos === 0)
            this.popFront();
        else if (pos === len - 1)
            this.popBack();
        else {
            var curNode = head;
            while (pos--) {
                if (!(curNode === null || curNode === void 0 ? void 0 : curNode.next))
                    throw new Error("unknown error");
                curNode = curNode.next;
            }
            if (!curNode || !curNode.pre || !curNode.next) {
                throw new Error("unknown error");
            }
            var pre = curNode.pre;
            var next = curNode.next;
            next.pre = pre;
            pre.next = next;
            if (len > 0)
                --len;
        }
    };
    this.eraseElementByValue = function (value) {
        while (head && head.value === value)
            this.popFront();
        while (tail && tail.value === value)
            this.popBack();
        if (!head)
            return;
        var curNode = head;
        while (curNode) {
            if (curNode.value === value) {
                var pre = curNode.pre;
                var next = curNode.next;
                if (next)
                    next.pre = pre;
                if (pre)
                    pre.next = next;
                if (len > 0)
                    --len;
            }
            curNode = curNode.next;
        }
    };
    this.pushBack = function (element) {
        if (element === null || element === undefined) {
            throw new Error("you can't push null or undefined here");
        }
        ++len;
        var newTail = new LinkNode(element);
        if (!tail) {
            head = tail = newTail;
        }
        else {
            tail.next = newTail;
            newTail.pre = tail;
            tail = newTail;
        }
    };
    this.popBack = function () {
        if (!tail)
            return;
        if (len > 0)
            --len;
        if (!tail)
            return;
        if (head === tail) {
            head = tail = undefined;
        }
        else {
            tail = tail.pre;
            if (tail)
                tail.next = undefined;
        }
    };
    this.setElementByPos = function (pos, element) {
        if (element === null || element === undefined) {
            throw new Error("you can't set null or undefined here");
        }
        if (pos < 0 || pos >= len)
            throw new Error("pos must more then 0 and less then the list length");
        var curNode = head;
        while (pos--) {
            if (!curNode)
                throw new Error("unknown error");
            curNode = curNode.next;
        }
        if (curNode)
            curNode.value = element;
    };
    /**
     * @param {number} pos insert element before pos, should in [0, list.size]
     * @param {any} element the element you want to insert
     * @param {number} [num = 1] the nums you want to insert
     */
    this.insert = function (pos, element, num) {
        if (num === void 0) { num = 1; }
        if (element === null || element === undefined) {
            throw new Error("you can't insert null or undefined here");
        }
        if (pos < 0 || pos > len)
            throw new Error("insert pos must more then 0 and less then or equal to the list length");
        if (num < 0)
            throw new Error("insert size must more than 0");
        if (pos === 0) {
            while (num--)
                this.pushFront(element);
        }
        else if (pos === len) {
            while (num--)
                this.pushBack(element);
        }
        else {
            var curNode = head;
            for (var i = 1; i < pos; ++i) {
                if (!(curNode === null || curNode === void 0 ? void 0 : curNode.next))
                    throw new Error("unknown error");
                curNode = curNode === null || curNode === void 0 ? void 0 : curNode.next;
            }
            if (!curNode) {
                throw new Error("unknown error");
            }
            var next = curNode.next;
            len += num;
            while (num--) {
                curNode.next = new LinkNode(element);
                curNode.next.pre = curNode;
                curNode = curNode.next;
            }
            curNode.next = next;
            if (next)
                next.pre = curNode;
        }
    };
    this.find = function (element) {
        var curNode = head;
        while (curNode) {
            if (curNode.value === element)
                return true;
            curNode = curNode.next;
        }
        return false;
    };
    this.reverse = function () {
        var pHead = head;
        var pTail = tail;
        var cnt = 0;
        while (pHead && pTail && cnt * 2 < len) {
            var tmp = pHead.value;
            pHead.value = pTail.value;
            pTail.value = tmp;
            pHead = pHead.next;
            pTail = pTail.pre;
            ++cnt;
        }
    };
    this.unique = function () {
        var curNode = head;
        while (curNode) {
            var tmpNode = curNode;
            while (tmpNode && tmpNode.next && tmpNode.value === tmpNode.next.value) {
                tmpNode = tmpNode.next;
                if (len > 0)
                    --len;
            }
            curNode.next = tmpNode.next;
            if (curNode.next)
                curNode.next.pre = curNode;
            curNode = curNode.next;
        }
    };
    this.sort = function (cmp) {
        var arr = [];
        this.forEach(function (element) {
            arr.push(element);
        });
        arr.sort(cmp);
        var curNode = head;
        arr.forEach(function (element) {
            if (curNode) {
                curNode.value = element;
                curNode = curNode.next;
            }
        });
    };
    this.pushFront = function (element) {
        if (element === null || element === undefined) {
            throw new Error("you can't push null or undefined here");
        }
        ++len;
        var newHead = new LinkNode(element);
        if (!head) {
            head = tail = newHead;
        }
        else {
            newHead.next = head;
            head.pre = newHead;
            head = newHead;
        }
    };
    this.popFront = function () {
        if (!head)
            return;
        if (len > 0)
            --len;
        if (!head)
            return;
        if (head === tail) {
            head = tail = undefined;
        }
        else {
            head = head.next;
            if (head)
                head.pre = undefined;
        }
    };
    /**
     * merge two sorted lists
     * @param list other list
     */
    this.merge = function (list) {
        var _this = this;
        var curNode = head;
        list.forEach(function (element) {
            while (curNode && curNode.value !== undefined && curNode.value <= element) {
                curNode = curNode.next;
            }
            if (curNode === undefined) {
                _this.pushBack(element);
                curNode = tail;
            }
            else if (curNode === head) {
                _this.pushFront(element);
                curNode = head;
            }
            else {
                ++len;
                var pre = curNode.pre;
                if (pre) {
                    pre.next = new LinkNode(element);
                    pre.next.pre = pre;
                    pre.next.next = curNode;
                    if (curNode)
                        curNode.pre = pre.next;
                }
            }
        });
    };
    this[Symbol.iterator] = function () {
        return (function () {
            var curNode;
            return __generator(this, function (_a) {
                switch (_a.label) {
                    case 0:
                        curNode = head;
                        _a.label = 1;
                    case 1:
                        if (!(curNode !== undefined)) return [3 /*break*/, 3];
                        if (!curNode.value)
                            throw new Error("unknown error");
                        return [4 /*yield*/, curNode.value];
                    case 2:
                        _a.sent();
                        curNode = curNode.next;
                        return [3 /*break*/, 1];
                    case 3: return [2 /*return*/];
                }
            });
        })();
    };
    container.forEach(function (element) { return _this.pushBack(element); });
    Object.freeze(this);
}
Object.freeze(LinkList);
exports.default = LinkList;

},{}],30:[function(require,module,exports){
"use strict";
var __generator = (this && this.__generator) || function (thisArg, body) {
    var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
    return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
    function verb(n) { return function (v) { return step([n, v]); }; }
    function step(op) {
        if (f) throw new TypeError("Generator is already executing.");
        while (_) try {
            if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
            if (y = 0, t) op = [op[0] & 2, t.value];
            switch (op[0]) {
                case 0: case 1: t = op; break;
                case 4: _.label++; return { value: op[1], done: false };
                case 5: _.label++; y = op[1]; op = [0]; continue;
                case 7: op = _.ops.pop(); _.trys.pop(); continue;
                default:
                    if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
                    if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
                    if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
                    if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
                    if (t[2]) _.ops.pop();
                    _.trys.pop(); continue;
            }
            op = body.call(thisArg, _);
        } catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
        if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
    }
};
var __values = (this && this.__values) || function(o) {
    var s = typeof Symbol === "function" && Symbol.iterator, m = s && o[s], i = 0;
    if (m) return m.call(o);
    if (o && typeof o.length === "number") return {
        next: function () {
            if (o && i >= o.length) o = void 0;
            return { value: o && o[i++], done: !o };
        }
    };
    throw new TypeError(s ? "Object is not iterable." : "Symbol.iterator is not defined.");
};
Object.defineProperty(exports, "__esModule", { value: true });
var TreeNode_1 = require("../Base/TreeNode");
function Map(container, cmp) {
    var _this = this;
    if (container === void 0) { container = []; }
    cmp = cmp || (function (x, y) {
        if (x < y)
            return -1;
        if (x > y)
            return 1;
        return 0;
    });
    var len = 0;
    var root = new TreeNode_1.default();
    root.color = TreeNode_1.default.TreeNodeColorType.black;
    this.size = function () {
        return len;
    };
    this.empty = function () {
        return len === 0;
    };
    this.clear = function () {
        len = 0;
        root.key = root.value = undefined;
        root.leftChild = root.rightChild = root.brother = undefined;
    };
    var findSubTreeMinNode = function (curNode) {
        if (!curNode || curNode.key === undefined)
            throw new Error("unknown error");
        return curNode.leftChild ? findSubTreeMinNode(curNode.leftChild) : curNode;
    };
    var findSubTreeMaxNode = function (curNode) {
        if (!curNode || curNode.key === undefined)
            throw new Error("unknown error");
        return curNode.rightChild ? findSubTreeMaxNode(curNode.rightChild) : curNode;
    };
    this.front = function () {
        if (this.empty())
            return undefined;
        var minNode = findSubTreeMinNode(root);
        if (minNode.key === undefined || minNode.value === undefined)
            throw new Error("unknown error");
        return {
            key: minNode.key,
            value: minNode.value
        };
    };
    this.back = function () {
        if (this.empty())
            return undefined;
        var maxNode = findSubTreeMaxNode(root);
        if (maxNode.key === undefined || maxNode.value === undefined)
            throw new Error("unknown error");
        return {
            key: maxNode.key,
            value: maxNode.value
        };
    };
    this.forEach = function (callback) {
        var e_1, _a;
        var index = 0;
        try {
            for (var _b = __values(this), _c = _b.next(); !_c.done; _c = _b.next()) {
                var pair = _c.value;
                callback(pair, index++);
            }
        }
        catch (e_1_1) { e_1 = { error: e_1_1 }; }
        finally {
            try {
                if (_c && !_c.done && (_a = _b.return)) _a.call(_b);
            }
            finally { if (e_1) throw e_1.error; }
        }
    };
    this.getElementByPos = function (pos) {
        var e_2, _a;
        if (pos < 0 || pos >= this.size())
            throw new Error("pos must more than 0 and less than set's size");
        var index = 0;
        try {
            for (var _b = __values(this), _c = _b.next(); !_c.done; _c = _b.next()) {
                var pair = _c.value;
                if (index === pos)
                    return pair;
                ++index;
            }
        }
        catch (e_2_1) { e_2 = { error: e_2_1 }; }
        finally {
            try {
                if (_c && !_c.done && (_a = _b.return)) _a.call(_b);
            }
            finally { if (e_2) throw e_2.error; }
        }
        throw new Error("unknown Error");
    };
    var _lowerBound = function (curNode, key) {
        if (!curNode || curNode.key === undefined || curNode.value === undefined)
            return undefined;
        var cmpResult = cmp(curNode.key, key);
        if (cmpResult === 0)
            return { key: curNode.key, value: curNode.value };
        if (cmpResult < 0)
            return _lowerBound(curNode.rightChild, key);
        return _lowerBound(curNode.leftChild, key) || {
            key: curNode.key,
            value: curNode.value
        };
    };
    this.lowerBound = function (key) {
        return _lowerBound(root, key);
    };
    var _upperBound = function (curNode, key) {
        if (!curNode || curNode.key === undefined || curNode.value === undefined)
            return undefined;
        var cmpResult = cmp(curNode.key, key);
        if (cmpResult <= 0)
            return _upperBound(curNode.rightChild, key);
        return _upperBound(curNode.leftChild, key) || {
            key: curNode.key,
            value: curNode.value
        };
    };
    this.upperBound = function (key) {
        return _upperBound(root, key);
    };
    var _reverseLowerBound = function (curNode, key) {
        if (!curNode || curNode.key === undefined || curNode.value === undefined)
            return undefined;
        var cmpResult = cmp(curNode.key, key);
        if (cmpResult === 0)
            return { key: curNode.key, value: curNode.value };
        if (cmpResult > 0)
            return _reverseLowerBound(curNode.leftChild, key);
        return _reverseLowerBound(curNode.rightChild, key) || {
            key: curNode.key,
            value: curNode.value
        };
    };
    this.reverseLowerBound = function (key) {
        return _reverseLowerBound(root, key);
    };
    var _reverseUpperBound = function (curNode, key) {
        if (!curNode || curNode.key === undefined || curNode.value === undefined)
            return undefined;
        var cmpResult = cmp(curNode.key, key);
        if (cmpResult >= 0)
            return _reverseUpperBound(curNode.leftChild, key);
        return _reverseUpperBound(curNode.rightChild, key) || {
            key: curNode.key,
            value: curNode.value
        };
    };
    this.reverseUpperBound = function (key) {
        return _reverseUpperBound(root, key);
    };
    var eraseNodeSelfBalance = function (curNode) {
        var parentNode = curNode.parent;
        if (!parentNode) {
            if (curNode === root)
                return;
            throw new Error("unknown error");
        }
        if (curNode.color === TreeNode_1.default.TreeNodeColorType.red) {
            curNode.color = TreeNode_1.default.TreeNodeColorType.black;
            return;
        }
        var brotherNode = curNode.brother;
        if (!brotherNode)
            throw new Error("unknown error");
        if (curNode === parentNode.leftChild) {
            if (brotherNode.color === TreeNode_1.default.TreeNodeColorType.red) {
                brotherNode.color = TreeNode_1.default.TreeNodeColorType.black;
                parentNode.color = TreeNode_1.default.TreeNodeColorType.red;
                var newRoot = parentNode.rotateLeft();
                if (root === parentNode)
                    root = newRoot;
                eraseNodeSelfBalance(curNode);
            }
            else if (brotherNode.color === TreeNode_1.default.TreeNodeColorType.black) {
                if (brotherNode.rightChild && brotherNode.rightChild.color === TreeNode_1.default.TreeNodeColorType.red) {
                    brotherNode.color = parentNode.color;
                    parentNode.color = TreeNode_1.default.TreeNodeColorType.black;
                    if (brotherNode.rightChild)
                        brotherNode.rightChild.color = TreeNode_1.default.TreeNodeColorType.black;
                    var newRoot = parentNode.rotateLeft();
                    if (root === parentNode)
                        root = newRoot;
                    curNode.color = TreeNode_1.default.TreeNodeColorType.black;
                }
                else if ((!brotherNode.rightChild || brotherNode.rightChild.color === TreeNode_1.default.TreeNodeColorType.black) && brotherNode.leftChild && brotherNode.leftChild.color === TreeNode_1.default.TreeNodeColorType.red) {
                    brotherNode.color = TreeNode_1.default.TreeNodeColorType.red;
                    if (brotherNode.leftChild)
                        brotherNode.leftChild.color = TreeNode_1.default.TreeNodeColorType.black;
                    var newRoot = brotherNode.rotateRight();
                    if (root === brotherNode)
                        root = newRoot;
                    eraseNodeSelfBalance(curNode);
                }
                else if ((!brotherNode.leftChild || brotherNode.leftChild.color === TreeNode_1.default.TreeNodeColorType.black) && (!brotherNode.rightChild || brotherNode.rightChild.color === TreeNode_1.default.TreeNodeColorType.black)) {
                    brotherNode.color = TreeNode_1.default.TreeNodeColorType.red;
                    eraseNodeSelfBalance(parentNode);
                }
            }
        }
        else if (curNode === parentNode.rightChild) {
            if (brotherNode.color === TreeNode_1.default.TreeNodeColorType.red) {
                brotherNode.color = TreeNode_1.default.TreeNodeColorType.black;
                parentNode.color = TreeNode_1.default.TreeNodeColorType.red;
                var newRoot = parentNode.rotateRight();
                if (root === parentNode)
                    root = newRoot;
                eraseNodeSelfBalance(curNode);
            }
            else if (brotherNode.color === TreeNode_1.default.TreeNodeColorType.black) {
                if (brotherNode.leftChild && brotherNode.leftChild.color === TreeNode_1.default.TreeNodeColorType.red) {
                    brotherNode.color = parentNode.color;
                    parentNode.color = TreeNode_1.default.TreeNodeColorType.black;
                    if (brotherNode.leftChild)
                        brotherNode.leftChild.color = TreeNode_1.default.TreeNodeColorType.black;
                    var newRoot = parentNode.rotateRight();
                    if (root === parentNode)
                        root = newRoot;
                    curNode.color = TreeNode_1.default.TreeNodeColorType.black;
                }
                else if ((!brotherNode.leftChild || brotherNode.leftChild.color === TreeNode_1.default.TreeNodeColorType.black) && brotherNode.rightChild && brotherNode.rightChild.color === TreeNode_1.default.TreeNodeColorType.red) {
                    brotherNode.color = TreeNode_1.default.TreeNodeColorType.red;
                    if (brotherNode.rightChild)
                        brotherNode.rightChild.color = TreeNode_1.default.TreeNodeColorType.black;
                    var newRoot = brotherNode.rotateLeft();
                    if (root === brotherNode)
                        root = newRoot;
                    eraseNodeSelfBalance(curNode);
                }
                else if ((!brotherNode.leftChild || brotherNode.leftChild.color === TreeNode_1.default.TreeNodeColorType.black) && (!brotherNode.rightChild || brotherNode.rightChild.color === TreeNode_1.default.TreeNodeColorType.black)) {
                    brotherNode.color = TreeNode_1.default.TreeNodeColorType.red;
                    eraseNodeSelfBalance(parentNode);
                }
            }
        }
    };
    var eraseNode = function (curNode) {
        var swapNode = curNode;
        while (swapNode.leftChild || swapNode.rightChild) {
            if (swapNode.rightChild) {
                swapNode = findSubTreeMinNode(swapNode.rightChild);
                var tmpKey = curNode.key;
                curNode.key = swapNode.key;
                swapNode.key = tmpKey;
                var tmpValue = curNode.value;
                curNode.value = swapNode.value;
                swapNode.value = tmpValue;
                curNode = swapNode;
            }
            if (swapNode.leftChild) {
                swapNode = findSubTreeMaxNode(swapNode.leftChild);
                var tmpKey = curNode.key;
                curNode.key = swapNode.key;
                swapNode.key = tmpKey;
                var tmpValue = curNode.value;
                curNode.value = swapNode.value;
                swapNode.value = tmpValue;
                curNode = swapNode;
            }
        }
        eraseNodeSelfBalance(swapNode);
        if (swapNode)
            swapNode.remove();
        --len;
        root.color = TreeNode_1.default.TreeNodeColorType.black;
    };
    var inOrderTraversal = function (curNode, callback) {
        if (!curNode || curNode.key === undefined)
            return false;
        var ifReturn = inOrderTraversal(curNode.leftChild, callback);
        if (ifReturn)
            return true;
        if (callback(curNode))
            return true;
        return inOrderTraversal(curNode.rightChild, callback);
    };
    this.eraseElementByPos = function (pos) {
        if (pos < 0 || pos >= len)
            throw new Error("pos must more than 0 and less than set's size");
        var index = 0;
        inOrderTraversal(root, function (curNode) {
            if (pos === index) {
                eraseNode(curNode);
                return true;
            }
            ++index;
            return false;
        });
    };
    this.eraseElementByKey = function (key) {
        if (this.empty())
            return;
        var curNode = findElementPos(root, key);
        if (curNode === undefined || curNode.key === undefined || cmp(curNode.key, key) !== 0)
            return;
        eraseNode(curNode);
    };
    var findInsertPos = function (curNode, element) {
        if (!curNode || curNode.key === undefined)
            throw new Error("unknown error");
        var cmpResult = cmp(element, curNode.key);
        if (cmpResult < 0) {
            if (!curNode.leftChild) {
                curNode.leftChild = new TreeNode_1.default();
                curNode.leftChild.parent = curNode;
                curNode.leftChild.brother = curNode.rightChild;
                if (curNode.rightChild)
                    curNode.rightChild.brother = curNode.leftChild;
                return curNode.leftChild;
            }
            return findInsertPos(curNode.leftChild, element);
        }
        else if (cmpResult > 0) {
            if (!curNode.rightChild) {
                curNode.rightChild = new TreeNode_1.default();
                curNode.rightChild.parent = curNode;
                curNode.rightChild.brother = curNode.leftChild;
                if (curNode.leftChild)
                    curNode.leftChild.brother = curNode.rightChild;
                return curNode.rightChild;
            }
            return findInsertPos(curNode.rightChild, element);
        }
        return curNode;
    };
    var insertNodeSelfBalance = function (curNode) {
        var parentNode = curNode.parent;
        if (!parentNode) {
            if (curNode === root)
                return;
            throw new Error("unknown error");
        }
        if (parentNode.color === TreeNode_1.default.TreeNodeColorType.black)
            return;
        if (parentNode.color === TreeNode_1.default.TreeNodeColorType.red) {
            var uncleNode = parentNode.brother;
            var grandParent = parentNode.parent;
            if (!grandParent)
                throw new Error("unknown error");
            if (uncleNode && uncleNode.color === TreeNode_1.default.TreeNodeColorType.red) {
                uncleNode.color = parentNode.color = TreeNode_1.default.TreeNodeColorType.black;
                grandParent.color = TreeNode_1.default.TreeNodeColorType.red;
                insertNodeSelfBalance(grandParent);
            }
            else if (!uncleNode || uncleNode.color === TreeNode_1.default.TreeNodeColorType.black) {
                if (parentNode === grandParent.leftChild) {
                    if (curNode === parentNode.leftChild) {
                        parentNode.color = TreeNode_1.default.TreeNodeColorType.black;
                        grandParent.color = TreeNode_1.default.TreeNodeColorType.red;
                        var newRoot = grandParent.rotateRight();
                        if (grandParent === root)
                            root = newRoot;
                    }
                    else if (curNode === parentNode.rightChild) {
                        var newRoot = parentNode.rotateLeft();
                        if (grandParent === root)
                            root = newRoot;
                        insertNodeSelfBalance(parentNode);
                    }
                }
                else if (parentNode === grandParent.rightChild) {
                    if (curNode === parentNode.leftChild) {
                        var newRoot = parentNode.rotateRight();
                        if (grandParent === root)
                            root = newRoot;
                        insertNodeSelfBalance(parentNode);
                    }
                    else if (curNode === parentNode.rightChild) {
                        parentNode.color = TreeNode_1.default.TreeNodeColorType.black;
                        grandParent.color = TreeNode_1.default.TreeNodeColorType.red;
                        var newRoot = grandParent.rotateLeft();
                        if (grandParent === root)
                            root = newRoot;
                    }
                }
            }
        }
    };
    this.setElement = function (key, value) {
        if (key === null || key === undefined) {
            throw new Error("to avoid some unnecessary errors, we don't suggest you insert null or undefined here");
        }
        if (value === null || value === undefined) {
            this.eraseElementByKey(key);
            return;
        }
        if (this.empty()) {
            ++len;
            root.key = key;
            root.value = value;
            root.color = TreeNode_1.default.TreeNodeColorType.black;
            return;
        }
        var curNode = findInsertPos(root, key);
        if (curNode.key !== undefined && cmp(curNode.key, key) === 0) {
            curNode.value = value;
            return;
        }
        ++len;
        curNode.key = key;
        curNode.value = value;
        insertNodeSelfBalance(curNode);
        root.color = TreeNode_1.default.TreeNodeColorType.black;
    };
    var findElementPos = function (curNode, element) {
        if (!curNode || curNode.key === undefined)
            return undefined;
        var cmpResult = cmp(element, curNode.key);
        if (cmpResult < 0)
            return findElementPos(curNode.leftChild, element);
        else if (cmpResult > 0)
            return findElementPos(curNode.rightChild, element);
        return curNode;
    };
    this.find = function (element) {
        return !!findElementPos(root, element);
    };
    this.getElementByKey = function (element) {
        var curNode = findElementPos(root, element);
        if ((curNode === null || curNode === void 0 ? void 0 : curNode.key) === undefined || (curNode === null || curNode === void 0 ? void 0 : curNode.value) === undefined)
            throw new Error("unknown error");
        return curNode.value;
    };
    // waiting for optimization, this is O(mlog(n+m)) algorithm now, but we expect it to be O(mlog(n/m+1)).
    // (https://en.wikipedia.org/wiki/Red%E2%80%93black_tree#Set_operations_and_bulk_operations)
    this.union = function (other) {
        var _this = this;
        other.forEach(function (_a) {
            var key = _a.key, value = _a.value;
            return _this.setElement(key, value);
        });
    };
    this.getHeight = function () {
        if (this.empty())
            return 0;
        var traversal = function (curNode) {
            if (!curNode)
                return 1;
            return Math.max(traversal(curNode.leftChild), traversal(curNode.rightChild)) + 1;
        };
        return traversal(root);
    };
    var iterationFunc = function (curNode) {
        return __generator(this, function (_a) {
            switch (_a.label) {
                case 0:
                    if (!curNode || curNode.key === undefined || curNode.value === undefined)
                        return [2 /*return*/];
                    return [5 /*yield**/, __values(iterationFunc(curNode.leftChild))];
                case 1:
                    _a.sent();
                    return [4 /*yield*/, { key: curNode.key, value: curNode.value }];
                case 2:
                    _a.sent();
                    return [5 /*yield**/, __values(iterationFunc(curNode.rightChild))];
                case 3:
                    _a.sent();
                    return [2 /*return*/];
            }
        });
    };
    this[Symbol.iterator] = function () {
        return iterationFunc(root);
    };
    container.forEach(function (_a) {
        var key = _a.key, value = _a.value;
        return _this.setElement(key, value);
    });
    Object.freeze(this);
}
Object.freeze(Map);
exports.default = Map;

},{"../Base/TreeNode":25}],31:[function(require,module,exports){
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
/**
 * @param container
 * @param cmp default cmp will generate a max heap
 * @constructor
 */
function PriorityQueue(container, cmp) {
    if (container === void 0) { container = []; }
    cmp = cmp || (function (x, y) {
        if (x > y)
            return -1;
        if (x < y)
            return 1;
        return 0;
    });
    var priorityQueue = [];
    container.forEach(function (element) { return priorityQueue.push(element); });
    var len = priorityQueue.length;
    var swap = function (x, y) {
        if (x < 0 || x >= len)
            throw new Error("unknown error");
        if (y < 0 || y >= len)
            throw new Error("unknown error");
        var tmp = priorityQueue[x];
        priorityQueue[x] = priorityQueue[y];
        priorityQueue[y] = tmp;
    };
    var adjust = function (parent) {
        if (parent < 0 || parent >= len)
            throw new Error("unknown error");
        var leftChild = parent * 2 + 1;
        var rightChild = parent * 2 + 2;
        if (leftChild < len && cmp(priorityQueue[parent], priorityQueue[leftChild]) > 0)
            swap(parent, leftChild);
        if (rightChild < len && cmp(priorityQueue[parent], priorityQueue[rightChild]) > 0)
            swap(parent, rightChild);
    };
    (function () {
        for (var parent_1 = Math.floor((len - 1) / 2); parent_1 >= 0; --parent_1) {
            var curParent = parent_1;
            var curChild = curParent * 2 + 1;
            while (curChild < len) {
                var leftChild = curChild;
                var rightChild = leftChild + 1;
                var minChild = leftChild;
                if (rightChild < len && cmp(priorityQueue[leftChild], priorityQueue[rightChild]) > 0)
                    minChild = rightChild;
                if (cmp(priorityQueue[curParent], priorityQueue[minChild]) <= 0)
                    break;
                swap(curParent, minChild);
                curParent = minChild;
                curChild = curParent * 2 + 1;
            }
        }
    })();
    this.size = function () {
        return len;
    };
    this.empty = function () {
        return len === 0;
    };
    this.clear = function () {
        len = 0;
        priorityQueue.length = 0;
    };
    this.push = function (element) {
        priorityQueue.push(element);
        ++len;
        if (len === 1)
            return;
        var curNode = len - 1;
        while (curNode > 0) {
            var parent_2 = Math.floor((curNode - 1) / 2);
            if (cmp(priorityQueue[parent_2], element) <= 0)
                break;
            adjust(parent_2);
            curNode = parent_2;
        }
    };
    this.pop = function () {
        if (this.empty())
            return;
        if (this.size() === 1) {
            --len;
            return;
        }
        var last = priorityQueue[len - 1];
        --len;
        var parent = 0;
        while (parent < this.size()) {
            var leftChild = parent * 2 + 1;
            var rightChild = parent * 2 + 2;
            if (leftChild >= this.size())
                break;
            var minChild = leftChild;
            if (rightChild < this.size() && cmp(priorityQueue[leftChild], priorityQueue[rightChild]) > 0)
                minChild = rightChild;
            if (cmp(priorityQueue[minChild], last) >= 0)
                break;
            priorityQueue[parent] = priorityQueue[minChild];
            parent = minChild;
        }
        priorityQueue[parent] = last;
    };
    this.top = function () {
        return priorityQueue[0];
    };
    Object.freeze(this);
}
Object.freeze(PriorityQueue);
exports.default = PriorityQueue;

},{}],32:[function(require,module,exports){
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var LinkList_1 = require("../LinkList/LinkList");
function Queue(container) {
    if (container === void 0) { container = []; }
    var queue = new LinkList_1.default(container);
    this.size = function () {
        return queue.size();
    };
    this.empty = function () {
        return queue.empty();
    };
    this.clear = function () {
        queue.clear();
    };
    this.push = function (element) {
        queue.pushBack(element);
    };
    this.pop = function () {
        queue.popFront();
    };
    this.front = function () {
        return queue.front();
    };
    Object.freeze(this);
}
Object.freeze(Queue);
exports.default = Queue;

},{"../LinkList/LinkList":29}],33:[function(require,module,exports){
"use strict";
var __generator = (this && this.__generator) || function (thisArg, body) {
    var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
    return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
    function verb(n) { return function (v) { return step([n, v]); }; }
    function step(op) {
        if (f) throw new TypeError("Generator is already executing.");
        while (_) try {
            if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
            if (y = 0, t) op = [op[0] & 2, t.value];
            switch (op[0]) {
                case 0: case 1: t = op; break;
                case 4: _.label++; return { value: op[1], done: false };
                case 5: _.label++; y = op[1]; op = [0]; continue;
                case 7: op = _.ops.pop(); _.trys.pop(); continue;
                default:
                    if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
                    if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
                    if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
                    if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
                    if (t[2]) _.ops.pop();
                    _.trys.pop(); continue;
            }
            op = body.call(thisArg, _);
        } catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
        if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
    }
};
var __values = (this && this.__values) || function(o) {
    var s = typeof Symbol === "function" && Symbol.iterator, m = s && o[s], i = 0;
    if (m) return m.call(o);
    if (o && typeof o.length === "number") return {
        next: function () {
            if (o && i >= o.length) o = void 0;
            return { value: o && o[i++], done: !o };
        }
    };
    throw new TypeError(s ? "Object is not iterable." : "Symbol.iterator is not defined.");
};
Object.defineProperty(exports, "__esModule", { value: true });
var TreeNode_1 = require("../Base/TreeNode");
function Set(container, cmp) {
    var _this = this;
    if (container === void 0) { container = []; }
    cmp = cmp || (function (x, y) {
        if (x < y)
            return -1;
        if (x > y)
            return 1;
        return 0;
    });
    var len = 0;
    var root = new TreeNode_1.default();
    root.color = TreeNode_1.default.TreeNodeColorType.black;
    this.size = function () {
        return len;
    };
    this.empty = function () {
        return len === 0;
    };
    this.clear = function () {
        len = 0;
        root.key = undefined;
        root.leftChild = root.rightChild = root.brother = root.parent = undefined;
        root.color = TreeNode_1.default.TreeNodeColorType.black;
    };
    var findSubTreeMinNode = function (curNode) {
        if (!curNode || curNode.key === undefined)
            throw new Error("unknown error");
        return curNode.leftChild ? findSubTreeMinNode(curNode.leftChild) : curNode;
    };
    var findSubTreeMaxNode = function (curNode) {
        if (!curNode || curNode.key === undefined)
            throw new Error("unknown error");
        return curNode.rightChild ? findSubTreeMaxNode(curNode.rightChild) : curNode;
    };
    this.front = function () {
        if (this.empty())
            return undefined;
        var minNode = findSubTreeMinNode(root);
        return minNode.key;
    };
    this.back = function () {
        if (this.empty())
            return undefined;
        var maxNode = findSubTreeMaxNode(root);
        return maxNode.key;
    };
    this.forEach = function (callback) {
        var e_1, _a;
        var index = 0;
        try {
            for (var _b = __values(this), _c = _b.next(); !_c.done; _c = _b.next()) {
                var element = _c.value;
                callback(element, index++);
            }
        }
        catch (e_1_1) { e_1 = { error: e_1_1 }; }
        finally {
            try {
                if (_c && !_c.done && (_a = _b.return)) _a.call(_b);
            }
            finally { if (e_1) throw e_1.error; }
        }
    };
    this.getElementByPos = function (pos) {
        var e_2, _a;
        if (pos < 0 || pos >= this.size())
            throw new Error("pos must more than 0 and less than set's size");
        var index = 0;
        try {
            for (var _b = __values(this), _c = _b.next(); !_c.done; _c = _b.next()) {
                var element = _c.value;
                if (index === pos)
                    return element;
                ++index;
            }
        }
        catch (e_2_1) { e_2 = { error: e_2_1 }; }
        finally {
            try {
                if (_c && !_c.done && (_a = _b.return)) _a.call(_b);
            }
            finally { if (e_2) throw e_2.error; }
        }
        throw new Error("unknown error");
    };
    var eraseNodeSelfBalance = function (curNode) {
        var parentNode = curNode.parent;
        if (!parentNode) {
            if (curNode === root)
                return;
            throw new Error("unknown error");
        }
        if (curNode.color === TreeNode_1.default.TreeNodeColorType.red) {
            curNode.color = TreeNode_1.default.TreeNodeColorType.black;
            return;
        }
        var brotherNode = curNode.brother;
        if (!brotherNode)
            throw new Error("unknown error");
        if (curNode === parentNode.leftChild) {
            if (brotherNode.color === TreeNode_1.default.TreeNodeColorType.red) {
                brotherNode.color = TreeNode_1.default.TreeNodeColorType.black;
                parentNode.color = TreeNode_1.default.TreeNodeColorType.red;
                var newRoot = parentNode.rotateLeft();
                if (root === parentNode)
                    root = newRoot;
                eraseNodeSelfBalance(curNode);
            }
            else if (brotherNode.color === TreeNode_1.default.TreeNodeColorType.black) {
                if (brotherNode.rightChild && brotherNode.rightChild.color === TreeNode_1.default.TreeNodeColorType.red) {
                    brotherNode.color = parentNode.color;
                    parentNode.color = TreeNode_1.default.TreeNodeColorType.black;
                    if (brotherNode.rightChild)
                        brotherNode.rightChild.color = TreeNode_1.default.TreeNodeColorType.black;
                    var newRoot = parentNode.rotateLeft();
                    if (root === parentNode)
                        root = newRoot;
                    curNode.color = TreeNode_1.default.TreeNodeColorType.black;
                }
                else if ((!brotherNode.rightChild || brotherNode.rightChild.color === TreeNode_1.default.TreeNodeColorType.black) && brotherNode.leftChild && brotherNode.leftChild.color === TreeNode_1.default.TreeNodeColorType.red) {
                    brotherNode.color = TreeNode_1.default.TreeNodeColorType.red;
                    if (brotherNode.leftChild)
                        brotherNode.leftChild.color = TreeNode_1.default.TreeNodeColorType.black;
                    var newRoot = brotherNode.rotateRight();
                    if (root === brotherNode)
                        root = newRoot;
                    eraseNodeSelfBalance(curNode);
                }
                else if ((!brotherNode.leftChild || brotherNode.leftChild.color === TreeNode_1.default.TreeNodeColorType.black) && (!brotherNode.rightChild || brotherNode.rightChild.color === TreeNode_1.default.TreeNodeColorType.black)) {
                    brotherNode.color = TreeNode_1.default.TreeNodeColorType.red;
                    eraseNodeSelfBalance(parentNode);
                }
            }
        }
        else if (curNode === parentNode.rightChild) {
            if (brotherNode.color === TreeNode_1.default.TreeNodeColorType.red) {
                brotherNode.color = TreeNode_1.default.TreeNodeColorType.black;
                parentNode.color = TreeNode_1.default.TreeNodeColorType.red;
                var newRoot = parentNode.rotateRight();
                if (root === parentNode)
                    root = newRoot;
                eraseNodeSelfBalance(curNode);
            }
            else if (brotherNode.color === TreeNode_1.default.TreeNodeColorType.black) {
                if (brotherNode.leftChild && brotherNode.leftChild.color === TreeNode_1.default.TreeNodeColorType.red) {
                    brotherNode.color = parentNode.color;
                    parentNode.color = TreeNode_1.default.TreeNodeColorType.black;
                    if (brotherNode.leftChild)
                        brotherNode.leftChild.color = TreeNode_1.default.TreeNodeColorType.black;
                    var newRoot = parentNode.rotateRight();
                    if (root === parentNode)
                        root = newRoot;
                    curNode.color = TreeNode_1.default.TreeNodeColorType.black;
                }
                else if ((!brotherNode.leftChild || brotherNode.leftChild.color === TreeNode_1.default.TreeNodeColorType.black) && brotherNode.rightChild && brotherNode.rightChild.color === TreeNode_1.default.TreeNodeColorType.red) {
                    brotherNode.color = TreeNode_1.default.TreeNodeColorType.red;
                    if (brotherNode.rightChild)
                        brotherNode.rightChild.color = TreeNode_1.default.TreeNodeColorType.black;
                    var newRoot = brotherNode.rotateLeft();
                    if (root === brotherNode)
                        root = newRoot;
                    eraseNodeSelfBalance(curNode);
                }
                else if ((!brotherNode.leftChild || brotherNode.leftChild.color === TreeNode_1.default.TreeNodeColorType.black) && (!brotherNode.rightChild || brotherNode.rightChild.color === TreeNode_1.default.TreeNodeColorType.black)) {
                    brotherNode.color = TreeNode_1.default.TreeNodeColorType.red;
                    eraseNodeSelfBalance(parentNode);
                }
            }
        }
    };
    var eraseNode = function (curNode) {
        var swapNode = curNode;
        while (swapNode.leftChild || swapNode.rightChild) {
            if (swapNode.rightChild) {
                swapNode = findSubTreeMinNode(swapNode.rightChild);
                var tmpKey = curNode.key;
                curNode.key = swapNode.key;
                swapNode.key = tmpKey;
                curNode = swapNode;
            }
            if (swapNode.leftChild) {
                swapNode = findSubTreeMaxNode(swapNode.leftChild);
                var tmpKey = curNode.key;
                curNode.key = swapNode.key;
                swapNode.key = tmpKey;
                curNode = swapNode;
            }
        }
        eraseNodeSelfBalance(swapNode);
        if (swapNode)
            swapNode.remove();
        --len;
        root.color = TreeNode_1.default.TreeNodeColorType.black;
    };
    var inOrderTraversal = function (curNode, callback) {
        if (!curNode || curNode.key === undefined)
            return false;
        var ifReturn = inOrderTraversal(curNode.leftChild, callback);
        if (ifReturn)
            return true;
        if (callback(curNode))
            return true;
        return inOrderTraversal(curNode.rightChild, callback);
    };
    this.eraseElementByPos = function (pos) {
        if (pos < 0 || pos >= len)
            throw new Error("pos must more than 0 and less than set's size");
        var index = 0;
        inOrderTraversal(root, function (curNode) {
            if (pos === index) {
                eraseNode(curNode);
                return true;
            }
            ++index;
            return false;
        });
    };
    this.eraseElementByValue = function (value) {
        if (this.empty())
            return;
        var curNode = findElementPos(root, value);
        if (curNode === undefined || curNode.key === undefined || cmp(curNode.key, value) !== 0)
            return;
        eraseNode(curNode);
    };
    var findInsertPos = function (curNode, element) {
        if (!curNode || curNode.key === undefined)
            throw new Error("unknown error");
        var cmpResult = cmp(element, curNode.key);
        if (cmpResult < 0) {
            if (!curNode.leftChild) {
                curNode.leftChild = new TreeNode_1.default();
                curNode.leftChild.parent = curNode;
                curNode.leftChild.brother = curNode.rightChild;
                if (curNode.rightChild)
                    curNode.rightChild.brother = curNode.leftChild;
                return curNode.leftChild;
            }
            return findInsertPos(curNode.leftChild, element);
        }
        else if (cmpResult > 0) {
            if (!curNode.rightChild) {
                curNode.rightChild = new TreeNode_1.default();
                curNode.rightChild.parent = curNode;
                curNode.rightChild.brother = curNode.leftChild;
                if (curNode.leftChild)
                    curNode.leftChild.brother = curNode.rightChild;
                return curNode.rightChild;
            }
            return findInsertPos(curNode.rightChild, element);
        }
        return curNode;
    };
    var insertNodeSelfBalance = function (curNode) {
        var parentNode = curNode.parent;
        if (!parentNode) {
            if (curNode === root)
                return;
            throw new Error("unknown error");
        }
        if (parentNode.color === TreeNode_1.default.TreeNodeColorType.black)
            return;
        if (parentNode.color === TreeNode_1.default.TreeNodeColorType.red) {
            var uncleNode = parentNode.brother;
            var grandParent = parentNode.parent;
            if (!grandParent)
                throw new Error("unknown error");
            if (uncleNode && uncleNode.color === TreeNode_1.default.TreeNodeColorType.red) {
                uncleNode.color = parentNode.color = TreeNode_1.default.TreeNodeColorType.black;
                grandParent.color = TreeNode_1.default.TreeNodeColorType.red;
                insertNodeSelfBalance(grandParent);
            }
            else if (!uncleNode || uncleNode.color === TreeNode_1.default.TreeNodeColorType.black) {
                if (parentNode === grandParent.leftChild) {
                    if (curNode === parentNode.leftChild) {
                        parentNode.color = TreeNode_1.default.TreeNodeColorType.black;
                        grandParent.color = TreeNode_1.default.TreeNodeColorType.red;
                        var newRoot = grandParent.rotateRight();
                        if (grandParent === root)
                            root = newRoot;
                    }
                    else if (curNode === parentNode.rightChild) {
                        var newRoot = parentNode.rotateLeft();
                        if (grandParent === root)
                            root = newRoot;
                        insertNodeSelfBalance(parentNode);
                    }
                }
                else if (parentNode === grandParent.rightChild) {
                    if (curNode === parentNode.leftChild) {
                        var newRoot = parentNode.rotateRight();
                        if (grandParent === root)
                            root = newRoot;
                        insertNodeSelfBalance(parentNode);
                    }
                    else if (curNode === parentNode.rightChild) {
                        parentNode.color = TreeNode_1.default.TreeNodeColorType.black;
                        grandParent.color = TreeNode_1.default.TreeNodeColorType.red;
                        var newRoot = grandParent.rotateLeft();
                        if (grandParent === root)
                            root = newRoot;
                    }
                }
            }
        }
    };
    this.insert = function (element) {
        if (element === null || element === undefined) {
            throw new Error("to avoid some unnecessary errors, we don't suggest you insert null or undefined here");
        }
        if (this.empty()) {
            ++len;
            root.key = element;
            root.color = TreeNode_1.default.TreeNodeColorType.black;
            return;
        }
        var curNode = findInsertPos(root, element);
        if (curNode.key !== undefined && cmp(curNode.key, element) === 0)
            return;
        ++len;
        curNode.key = element;
        insertNodeSelfBalance(curNode);
        root.color = TreeNode_1.default.TreeNodeColorType.black;
    };
    var findElementPos = function (curNode, element) {
        if (!curNode || curNode.key === undefined)
            return undefined;
        var cmpResult = cmp(element, curNode.key);
        if (cmpResult < 0)
            return findElementPos(curNode.leftChild, element);
        else if (cmpResult > 0)
            return findElementPos(curNode.rightChild, element);
        return curNode;
    };
    this.find = function (element) {
        var curNode = findElementPos(root, element);
        return curNode !== undefined && curNode.key !== undefined && cmp(curNode.key, element) === 0;
    };
    var _lowerBound = function (curNode, key) {
        if (!curNode || curNode.key === undefined)
            return undefined;
        var cmpResult = cmp(curNode.key, key);
        if (cmpResult === 0)
            return curNode.key;
        if (cmpResult < 0)
            return _lowerBound(curNode.rightChild, key);
        var res = _lowerBound(curNode.leftChild, key);
        if (res !== undefined)
            return res;
        return curNode.key;
    };
    this.lowerBound = function (key) {
        return _lowerBound(root, key);
    };
    var _upperBound = function (curNode, key) {
        if (!curNode || curNode.key === undefined)
            return undefined;
        var cmpResult = cmp(curNode.key, key);
        if (cmpResult <= 0)
            return _upperBound(curNode.rightChild, key);
        var res = _upperBound(curNode.leftChild, key);
        if (res !== undefined)
            return res;
        return curNode.key;
    };
    this.upperBound = function (key) {
        return _upperBound(root, key);
    };
    var _reverseLowerBound = function (curNode, key) {
        if (!curNode || curNode.key === undefined)
            return undefined;
        var cmpResult = cmp(curNode.key, key);
        if (cmpResult === 0)
            return curNode.key;
        if (cmpResult > 0)
            return _reverseLowerBound(curNode.leftChild, key);
        var res = _reverseLowerBound(curNode.rightChild, key);
        if (res !== undefined)
            return res;
        return curNode.key;
    };
    this.reverseLowerBound = function (key) {
        return _reverseLowerBound(root, key);
    };
    var _reverseUpperBound = function (curNode, key) {
        if (!curNode || curNode.key === undefined)
            return undefined;
        var cmpResult = cmp(curNode.key, key);
        if (cmpResult >= 0)
            return _reverseUpperBound(curNode.leftChild, key);
        var res = _reverseUpperBound(curNode.rightChild, key);
        if (res !== undefined)
            return res;
        return curNode.key;
    };
    this.reverseUpperBound = function (key) {
        return _reverseUpperBound(root, key);
    };
    // waiting for optimization, this is O(mlog(n+m)) algorithm now, but we expect it to be O(mlog(n/m+1)).
    // (https://en.wikipedia.org/wiki/Red%E2%80%93black_tree#Set_operations_and_bulk_operations)
    this.union = function (other) {
        var _this = this;
        other.forEach(function (element) { return _this.insert(element); });
    };
    this.getHeight = function () {
        if (this.empty())
            return 0;
        var traversal = function (curNode) {
            if (!curNode)
                return 1;
            return Math.max(traversal(curNode.leftChild), traversal(curNode.rightChild)) + 1;
        };
        return traversal(root);
    };
    var iterationFunc = function (curNode) {
        return __generator(this, function (_a) {
            switch (_a.label) {
                case 0:
                    if (!curNode || curNode.key === undefined)
                        return [2 /*return*/];
                    return [5 /*yield**/, __values(iterationFunc(curNode.leftChild))];
                case 1:
                    _a.sent();
                    return [4 /*yield*/, curNode.key];
                case 2:
                    _a.sent();
                    return [5 /*yield**/, __values(iterationFunc(curNode.rightChild))];
                case 3:
                    _a.sent();
                    return [2 /*return*/];
            }
        });
    };
    this[Symbol.iterator] = function () {
        return iterationFunc(root);
    };
    container.forEach(function (element) { return _this.insert(element); });
    Object.freeze(this);
}
Object.freeze(Set);
exports.default = Set;

},{"../Base/TreeNode":25}],34:[function(require,module,exports){
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
function Stack(container) {
    var _this = this;
    if (container === void 0) { container = []; }
    var len = 0;
    var stack = [];
    this.size = function () {
        return len;
    };
    this.empty = function () {
        return len === 0;
    };
    this.clear = function () {
        len = 0;
        stack.length = 0;
    };
    this.push = function (element) {
        stack.push(element);
        ++len;
    };
    this.pop = function () {
        stack.pop();
        if (len > 0)
            --len;
    };
    this.top = function () {
        return stack[len - 1];
    };
    container.forEach(function (element) { return _this.push(element); });
    Object.freeze(this);
}
Object.freeze(Stack);
exports.default = Stack;

},{}],35:[function(require,module,exports){
"use strict";
var __generator = (this && this.__generator) || function (thisArg, body) {
    var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
    return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
    function verb(n) { return function (v) { return step([n, v]); }; }
    function step(op) {
        if (f) throw new TypeError("Generator is already executing.");
        while (_) try {
            if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
            if (y = 0, t) op = [op[0] & 2, t.value];
            switch (op[0]) {
                case 0: case 1: t = op; break;
                case 4: _.label++; return { value: op[1], done: false };
                case 5: _.label++; y = op[1]; op = [0]; continue;
                case 7: op = _.ops.pop(); _.trys.pop(); continue;
                default:
                    if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
                    if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
                    if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
                    if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
                    if (t[2]) _.ops.pop();
                    _.trys.pop(); continue;
            }
            op = body.call(thisArg, _);
        } catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
        if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
    }
};
var __read = (this && this.__read) || function (o, n) {
    var m = typeof Symbol === "function" && o[Symbol.iterator];
    if (!m) return o;
    var i = m.call(o), r, ar = [], e;
    try {
        while ((n === void 0 || n-- > 0) && !(r = i.next()).done) ar.push(r.value);
    }
    catch (error) { e = { error: error }; }
    finally {
        try {
            if (r && !r.done && (m = i["return"])) m.call(i);
        }
        finally { if (e) throw e.error; }
    }
    return ar;
};
var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {
    if (pack || arguments.length === 2) for (var i = 0, l = from.length, ar; i < l; i++) {
        if (ar || !(i in from)) {
            if (!ar) ar = Array.prototype.slice.call(from, 0, i);
            ar[i] = from[i];
        }
    }
    return to.concat(ar || Array.prototype.slice.call(from));
};
var __values = (this && this.__values) || function(o) {
    var s = typeof Symbol === "function" && Symbol.iterator, m = s && o[s], i = 0;
    if (m) return m.call(o);
    if (o && typeof o.length === "number") return {
        next: function () {
            if (o && i >= o.length) o = void 0;
            return { value: o && o[i++], done: !o };
        }
    };
    throw new TypeError(s ? "Object is not iterable." : "Symbol.iterator is not defined.");
};
Object.defineProperty(exports, "__esModule", { value: true });
function Vector(container) {
    var _this = this;
    if (container === void 0) { container = []; }
    var len = 0;
    var vector = [];
    this.size = function () {
        return len;
    };
    this.empty = function () {
        return len === 0;
    };
    this.clear = function () {
        len = 0;
        vector.length = 0;
    };
    this.front = function () {
        if (this.empty())
            return undefined;
        return vector[0];
    };
    this.back = function () {
        if (this.empty())
            return undefined;
        return vector[len - 1];
    };
    this.forEach = function (callback) {
        vector.forEach(callback);
    };
    this.getElementByPos = function (pos) {
        if (pos < 0 || pos >= len)
            throw new Error("pos must more than 0 and less than vector's size");
        return vector[pos];
    };
    this.eraseElementByPos = function (pos) {
        if (pos < 0 || pos >= len)
            throw new Error("pos must more than 0 and less than vector's size");
        for (var i = pos; i < len - 1; ++i)
            vector[i] = vector[i + 1];
        this.popBack();
    };
    this.eraseElementByValue = function (value) {
        var newArr = [];
        this.forEach(function (element) {
            if (element !== value)
                newArr.push(element);
        });
        newArr.forEach(function (element, index) {
            vector[index] = element;
        });
        var newLen = newArr.length;
        while (len > newLen)
            this.popBack();
    };
    this.pushBack = function (element) {
        vector.push(element);
        ++len;
    };
    this.popBack = function () {
        vector.pop();
        if (len > 0)
            --len;
    };
    this.setElementByPos = function (pos, element) {
        if (pos < 0 || pos >= len)
            throw new Error("pos must more than 0 and less than vector's size");
        vector[pos] = element;
    };
    this.insert = function (pos, element, num) {
        if (num === void 0) { num = 1; }
        if (pos < 0 || pos > len)
            throw new Error("pos must more than 0 and less than or equal to vector's size");
        vector.splice.apply(vector, __spreadArray([pos, 0], __read(new Array(num).fill(element)), false));
        len += num;
    };
    this.find = function (element) {
        return vector.includes(element);
    };
    this.reverse = function () {
        vector.reverse();
    };
    this.unique = function () {
        var pre;
        var newArr = [];
        this.forEach(function (element, index) {
            if (index === 0 || element !== pre) {
                newArr.push(element);
                pre = element;
            }
        });
        newArr.forEach(function (element, index) {
            vector[index] = element;
        });
        var newLen = newArr.length;
        while (len > newLen)
            this.popBack();
    };
    this.sort = function (cmp) {
        vector.sort(cmp);
    };
    this[Symbol.iterator] = function () {
        return (function () {
            return __generator(this, function (_a) {
                switch (_a.label) {
                    case 0: return [5 /*yield**/, __values(vector)];
                    case 1: return [2 /*return*/, _a.sent()];
                }
            });
        })();
    };
    container.forEach(function (element) { return _this.pushBack(element); });
    Object.freeze(this);
}
Object.freeze(Vector);
exports.default = Vector;

},{}],36:[function(require,module,exports){
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.HashMap = exports.HashSet = exports.Map = exports.Set = exports.PriorityQueue = exports.Deque = exports.LinkList = exports.Queue = exports.Stack = exports.Vector = void 0;
var Vector_1 = require("./Vector/Vector");
exports.Vector = Vector_1.default;
var Stack_1 = require("./Stack/Stack");
exports.Stack = Stack_1.default;
var Queue_1 = require("./Queue/Queue");
exports.Queue = Queue_1.default;
var LinkList_1 = require("./LinkList/LinkList");
exports.LinkList = LinkList_1.default;
var Deque_1 = require("./Deque/Deque");
exports.Deque = Deque_1.default;
var PriorityQueue_1 = require("./PriorityQueue/PriorityQueue");
exports.PriorityQueue = PriorityQueue_1.default;
var Set_1 = require("./Set/Set");
exports.Set = Set_1.default;
var Map_1 = require("./Map/Map");
exports.Map = Map_1.default;
var HashSet_1 = require("./HashSet/HashSet");
exports.HashSet = HashSet_1.default;
var HashMap_1 = require("./HashMap/HashMap");
exports.HashMap = HashMap_1.default;

},{"./Deque/Deque":26,"./HashMap/HashMap":27,"./HashSet/HashSet":28,"./LinkList/LinkList":29,"./Map/Map":30,"./PriorityQueue/PriorityQueue":31,"./Queue/Queue":32,"./Set/Set":33,"./Stack/Stack":34,"./Vector/Vector":35}],37:[function(require,module,exports){
'use strict'

// A linked list to keep track of recently-used-ness
const Yallist = require('yallist')

const MAX = Symbol('max')
const LENGTH = Symbol('length')
const LENGTH_CALCULATOR = Symbol('lengthCalculator')
const ALLOW_STALE = Symbol('allowStale')
const MAX_AGE = Symbol('maxAge')
const DISPOSE = Symbol('dispose')
const NO_DISPOSE_ON_SET = Symbol('noDisposeOnSet')
const LRU_LIST = Symbol('lruList')
const CACHE = Symbol('cache')
const UPDATE_AGE_ON_GET = Symbol('updateAgeOnGet')

const naiveLength = () => 1

// lruList is a yallist where the head is the youngest
// item, and the tail is the oldest.  the list contains the Hit
// objects as the entries.
// Each Hit object has a reference to its Yallist.Node.  This
// never changes.
//
// cache is a Map (or PseudoMap) that matches the keys to
// the Yallist.Node object.
class LRUCache {
  constructor (options) {
    if (typeof options === 'number')
      options = { max: options }

    if (!options)
      options = {}

    if (options.max && (typeof options.max !== 'number' || options.max < 0))
      throw new TypeError('max must be a non-negative number')
    // Kind of weird to have a default max of Infinity, but oh well.
    const max = this[MAX] = options.max || Infinity

    const lc = options.length || naiveLength
    this[LENGTH_CALCULATOR] = (typeof lc !== 'function') ? naiveLength : lc
    this[ALLOW_STALE] = options.stale || false
    if (options.maxAge && typeof options.maxAge !== 'number')
      throw new TypeError('maxAge must be a number')
    this[MAX_AGE] = options.maxAge || 0
    this[DISPOSE] = options.dispose
    this[NO_DISPOSE_ON_SET] = options.noDisposeOnSet || false
    this[UPDATE_AGE_ON_GET] = options.updateAgeOnGet || false
    this.reset()
  }

  // resize the cache when the max changes.
  set max (mL) {
    if (typeof mL !== 'number' || mL < 0)
      throw new TypeError('max must be a non-negative number')

    this[MAX] = mL || Infinity
    trim(this)
  }
  get max () {
    return this[MAX]
  }

  set allowStale (allowStale) {
    this[ALLOW_STALE] = !!allowStale
  }
  get allowStale () {
    return this[ALLOW_STALE]
  }

  set maxAge (mA) {
    if (typeof mA !== 'number')
      throw new TypeError('maxAge must be a non-negative number')

    this[MAX_AGE] = mA
    trim(this)
  }
  get maxAge () {
    return this[MAX_AGE]
  }

  // resize the cache when the lengthCalculator changes.
  set lengthCalculator (lC) {
    if (typeof lC !== 'function')
      lC = naiveLength

    if (lC !== this[LENGTH_CALCULATOR]) {
      this[LENGTH_CALCULATOR] = lC
      this[LENGTH] = 0
      this[LRU_LIST].forEach(hit => {
        hit.length = this[LENGTH_CALCULATOR](hit.value, hit.key)
        this[LENGTH] += hit.length
      })
    }
    trim(this)
  }
  get lengthCalculator () { return this[LENGTH_CALCULATOR] }

  get length () { return this[LENGTH] }
  get itemCount () { return this[LRU_LIST].length }

  rforEach (fn, thisp) {
    thisp = thisp || this
    for (let walker = this[LRU_LIST].tail; walker !== null;) {
      const prev = walker.prev
      forEachStep(this, fn, walker, thisp)
      walker = prev
    }
  }

  forEach (fn, thisp) {
    thisp = thisp || this
    for (let walker = this[LRU_LIST].head; walker !== null;) {
      const next = walker.next
      forEachStep(this, fn, walker, thisp)
      walker = next
    }
  }

  keys () {
    return this[LRU_LIST].toArray().map(k => k.key)
  }

  values () {
    return this[LRU_LIST].toArray().map(k => k.value)
  }

  reset () {
    if (this[DISPOSE] &&
        this[LRU_LIST] &&
        this[LRU_LIST].length) {
      this[LRU_LIST].forEach(hit => this[DISPOSE](hit.key, hit.value))
    }

    this[CACHE] = new Map() // hash of items by key
    this[LRU_LIST] = new Yallist() // list of items in order of use recency
    this[LENGTH] = 0 // length of items in the list
  }

  dump () {
    return this[LRU_LIST].map(hit =>
      isStale(this, hit) ? false : {
        k: hit.key,
        v: hit.value,
        e: hit.now + (hit.maxAge || 0)
      }).toArray().filter(h => h)
  }

  dumpLru () {
    return this[LRU_LIST]
  }

  set (key, value, maxAge) {
    maxAge = maxAge || this[MAX_AGE]

    if (maxAge && typeof maxAge !== 'number')
      throw new TypeError('maxAge must be a number')

    const now = maxAge ? Date.now() : 0
    const len = this[LENGTH_CALCULATOR](value, key)

    if (this[CACHE].has(key)) {
      if (len > this[MAX]) {
        del(this, this[CACHE].get(key))
        return false
      }

      const node = this[CACHE].get(key)
      const item = node.value

      // dispose of the old one before overwriting
      // split out into 2 ifs for better coverage tracking
      if (this[DISPOSE]) {
        if (!this[NO_DISPOSE_ON_SET])
          this[DISPOSE](key, item.value)
      }

      item.now = now
      item.maxAge = maxAge
      item.value = value
      this[LENGTH] += len - item.length
      item.length = len
      this.get(key)
      trim(this)
      return true
    }

    const hit = new Entry(key, value, len, now, maxAge)

    // oversized objects fall out of cache automatically.
    if (hit.length > this[MAX]) {
      if (this[DISPOSE])
        this[DISPOSE](key, value)

      return false
    }

    this[LENGTH] += hit.length
    this[LRU_LIST].unshift(hit)
    this[CACHE].set(key, this[LRU_LIST].head)
    trim(this)
    return true
  }

  has (key) {
    if (!this[CACHE].has(key)) return false
    const hit = this[CACHE].get(key).value
    return !isStale(this, hit)
  }

  get (key) {
    return get(this, key, true)
  }

  peek (key) {
    return get(this, key, false)
  }

  pop () {
    const node = this[LRU_LIST].tail
    if (!node)
      return null

    del(this, node)
    return node.value
  }

  del (key) {
    del(this, this[CACHE].get(key))
  }

  load (arr) {
    // reset the cache
    this.reset()

    const now = Date.now()
    // A previous serialized cache has the most recent items first
    for (let l = arr.length - 1; l >= 0; l--) {
      const hit = arr[l]
      const expiresAt = hit.e || 0
      if (expiresAt === 0)
        // the item was created without expiration in a non aged cache
        this.set(hit.k, hit.v)
      else {
        const maxAge = expiresAt - now
        // dont add already expired items
        if (maxAge > 0) {
          this.set(hit.k, hit.v, maxAge)
        }
      }
    }
  }

  prune () {
    this[CACHE].forEach((value, key) => get(this, key, false))
  }
}

const get = (self, key, doUse) => {
  const node = self[CACHE].get(key)
  if (node) {
    const hit = node.value
    if (isStale(self, hit)) {
      del(self, node)
      if (!self[ALLOW_STALE])
        return undefined
    } else {
      if (doUse) {
        if (self[UPDATE_AGE_ON_GET])
          node.value.now = Date.now()
        self[LRU_LIST].unshiftNode(node)
      }
    }
    return hit.value
  }
}

const isStale = (self, hit) => {
  if (!hit || (!hit.maxAge && !self[MAX_AGE]))
    return false

  const diff = Date.now() - hit.now
  return hit.maxAge ? diff > hit.maxAge
    : self[MAX_AGE] && (diff > self[MAX_AGE])
}

const trim = self => {
  if (self[LENGTH] > self[MAX]) {
    for (let walker = self[LRU_LIST].tail;
      self[LENGTH] > self[MAX] && walker !== null;) {
      // We know that we're about to delete this one, and also
      // what the next least recently used key will be, so just
      // go ahead and set it now.
      const prev = walker.prev
      del(self, walker)
      walker = prev
    }
  }
}

const del = (self, node) => {
  if (node) {
    const hit = node.value
    if (self[DISPOSE])
      self[DISPOSE](hit.key, hit.value)

    self[LENGTH] -= hit.length
    self[CACHE].delete(hit.key)
    self[LRU_LIST].removeNode(node)
  }
}

class Entry {
  constructor (key, value, length, now, maxAge) {
    this.key = key
    this.value = value
    this.length = length
    this.now = now
    this.maxAge = maxAge || 0
  }
}

const forEachStep = (self, fn, node, thisp) => {
  let hit = node.value
  if (isStale(self, hit)) {
    del(self, node)
    if (!self[ALLOW_STALE])
      hit = undefined
  }
  if (hit)
    fn.call(thisp, hit.value, hit.key, self)
}

module.exports = LRUCache

},{"yallist":83}],38:[function(require,module,exports){
(function (Buffer){(function (){
/* Protocol - protocol constants */
const protocol = module.exports

/* Command code => mnemonic */
protocol.types = {
  0: 'reserved',
  1: 'connect',
  2: 'connack',
  3: 'publish',
  4: 'puback',
  5: 'pubrec',
  6: 'pubrel',
  7: 'pubcomp',
  8: 'subscribe',
  9: 'suback',
  10: 'unsubscribe',
  11: 'unsuback',
  12: 'pingreq',
  13: 'pingresp',
  14: 'disconnect',
  15: 'auth'
}

/* Mnemonic => Command code */
protocol.codes = {}
for (const k in protocol.types) {
  const v = protocol.types[k]
  protocol.codes[v] = k
}

/* Header */
protocol.CMD_SHIFT = 4
protocol.CMD_MASK = 0xF0
protocol.DUP_MASK = 0x08
protocol.QOS_MASK = 0x03
protocol.QOS_SHIFT = 1
protocol.RETAIN_MASK = 0x01

/* Length */
protocol.VARBYTEINT_MASK = 0x7F
protocol.VARBYTEINT_FIN_MASK = 0x80
protocol.VARBYTEINT_MAX = 268435455

/* Connack */
protocol.SESSIONPRESENT_MASK = 0x01
protocol.SESSIONPRESENT_HEADER = Buffer.from([protocol.SESSIONPRESENT_MASK])
protocol.CONNACK_HEADER = Buffer.from([protocol.codes.connack << protocol.CMD_SHIFT])

/* Connect */
protocol.USERNAME_MASK = 0x80
protocol.PASSWORD_MASK = 0x40
protocol.WILL_RETAIN_MASK = 0x20
protocol.WILL_QOS_MASK = 0x18
protocol.WILL_QOS_SHIFT = 3
protocol.WILL_FLAG_MASK = 0x04
protocol.CLEAN_SESSION_MASK = 0x02
protocol.CONNECT_HEADER = Buffer.from([protocol.codes.connect << protocol.CMD_SHIFT])

/* Properties */
protocol.properties = {
  sessionExpiryInterval: 17,
  willDelayInterval: 24,
  receiveMaximum: 33,
  maximumPacketSize: 39,
  topicAliasMaximum: 34,
  requestResponseInformation: 25,
  requestProblemInformation: 23,
  userProperties: 38,
  authenticationMethod: 21,
  authenticationData: 22,
  payloadFormatIndicator: 1,
  messageExpiryInterval: 2,
  contentType: 3,
  responseTopic: 8,
  correlationData: 9,
  maximumQoS: 36,
  retainAvailable: 37,
  assignedClientIdentifier: 18,
  reasonString: 31,
  wildcardSubscriptionAvailable: 40,
  subscriptionIdentifiersAvailable: 41,
  sharedSubscriptionAvailable: 42,
  serverKeepAlive: 19,
  responseInformation: 26,
  serverReference: 28,
  topicAlias: 35,
  subscriptionIdentifier: 11
}
protocol.propertiesCodes = {}
for (const prop in protocol.properties) {
  const id = protocol.properties[prop]
  protocol.propertiesCodes[id] = prop
}
protocol.propertiesTypes = {
  sessionExpiryInterval: 'int32',
  willDelayInterval: 'int32',
  receiveMaximum: 'int16',
  maximumPacketSize: 'int32',
  topicAliasMaximum: 'int16',
  requestResponseInformation: 'byte',
  requestProblemInformation: 'byte',
  userProperties: 'pair',
  authenticationMethod: 'string',
  authenticationData: 'binary',
  payloadFormatIndicator: 'byte',
  messageExpiryInterval: 'int32',
  contentType: 'string',
  responseTopic: 'string',
  correlationData: 'binary',
  maximumQoS: 'int8',
  retainAvailable: 'byte',
  assignedClientIdentifier: 'string',
  reasonString: 'string',
  wildcardSubscriptionAvailable: 'byte',
  subscriptionIdentifiersAvailable: 'byte',
  sharedSubscriptionAvailable: 'byte',
  serverKeepAlive: 'int16',
  responseInformation: 'string',
  serverReference: 'string',
  topicAlias: 'int16',
  subscriptionIdentifier: 'var'
}

function genHeader (type) {
  return [0, 1, 2].map(qos => {
    return [0, 1].map(dup => {
      return [0, 1].map(retain => {
        const buf = Buffer.alloc(1)
        buf.writeUInt8(
          protocol.codes[type] << protocol.CMD_SHIFT |
          (dup ? protocol.DUP_MASK : 0) |
          qos << protocol.QOS_SHIFT | retain, 0, true)
        return buf
      })
    })
  })
}

/* Publish */
protocol.PUBLISH_HEADER = genHeader('publish')

/* Subscribe */
protocol.SUBSCRIBE_HEADER = genHeader('subscribe')
protocol.SUBSCRIBE_OPTIONS_QOS_MASK = 0x03
protocol.SUBSCRIBE_OPTIONS_NL_MASK = 0x01
protocol.SUBSCRIBE_OPTIONS_NL_SHIFT = 2
protocol.SUBSCRIBE_OPTIONS_RAP_MASK = 0x01
protocol.SUBSCRIBE_OPTIONS_RAP_SHIFT = 3
protocol.SUBSCRIBE_OPTIONS_RH_MASK = 0x03
protocol.SUBSCRIBE_OPTIONS_RH_SHIFT = 4
protocol.SUBSCRIBE_OPTIONS_RH = [0x00, 0x10, 0x20]
protocol.SUBSCRIBE_OPTIONS_NL = 0x04
protocol.SUBSCRIBE_OPTIONS_RAP = 0x08
protocol.SUBSCRIBE_OPTIONS_QOS = [0x00, 0x01, 0x02]

/* Unsubscribe */
protocol.UNSUBSCRIBE_HEADER = genHeader('unsubscribe')

/* Confirmations */
protocol.ACKS = {
  unsuback: genHeader('unsuback'),
  puback: genHeader('puback'),
  pubcomp: genHeader('pubcomp'),
  pubrel: genHeader('pubrel'),
  pubrec: genHeader('pubrec')
}

protocol.SUBACK_HEADER = Buffer.from([protocol.codes.suback << protocol.CMD_SHIFT])

/* Protocol versions */
protocol.VERSION3 = Buffer.from([3])
protocol.VERSION4 = Buffer.from([4])
protocol.VERSION5 = Buffer.from([5])
protocol.VERSION131 = Buffer.from([131])
protocol.VERSION132 = Buffer.from([132])

/* QoS */
protocol.QOS = [0, 1, 2].map(qos => {
  return Buffer.from([qos])
})

/* Empty packets */
protocol.EMPTY = {
  pingreq: Buffer.from([protocol.codes.pingreq << 4, 0]),
  pingresp: Buffer.from([protocol.codes.pingresp << 4, 0]),
  disconnect: Buffer.from([protocol.codes.disconnect << 4, 0])
}

}).call(this)}).call(this,require("buffer").Buffer)
},{"buffer":17}],39:[function(require,module,exports){
(function (Buffer){(function (){
const writeToStream = require('./writeToStream')
const EventEmitter = require('events')

function generate (packet, opts) {
  const stream = new Accumulator()
  writeToStream(packet, stream, opts)
  return stream.concat()
}

class Accumulator extends EventEmitter {
  constructor () {
    super()
    this._array = new Array(20)
    this._i = 0
  }

  write (chunk) {
    this._array[this._i++] = chunk
    return true
  }

  concat () {
    let length = 0
    const lengths = new Array(this._array.length)
    const list = this._array
    let pos = 0
    let i

    for (i = 0; i < list.length && list[i] !== undefined; i++) {
      if (typeof list[i] !== 'string') lengths[i] = list[i].length
      else lengths[i] = Buffer.byteLength(list[i])

      length += lengths[i]
    }

    const result = Buffer.allocUnsafe(length)

    for (i = 0; i < list.length && list[i] !== undefined; i++) {
      if (typeof list[i] !== 'string') {
        list[i].copy(result, pos)
        pos += lengths[i]
      } else {
        result.write(list[i], pos)
        pos += lengths[i]
      }
    }

    return result
  }
}

module.exports = generate

}).call(this)}).call(this,require("buffer").Buffer)
},{"./writeToStream":44,"buffer":17,"events":22}],40:[function(require,module,exports){
exports.parser = require('./parser').parser
exports.generate = require('./generate')
exports.writeToStream = require('./writeToStream')

},{"./generate":39,"./parser":43,"./writeToStream":44}],41:[function(require,module,exports){
(function (Buffer){(function (){
const max = 65536
const cache = {}

// in node 6 Buffer.subarray returns a Uint8Array instead of a Buffer
// later versions return a Buffer
// alternative is Buffer.slice but that creates a new buffer
// creating new buffers takes time
// SubOk is only false on node < 8
const SubOk = Buffer.isBuffer(Buffer.from([1, 2]).subarray(0, 1))

function generateBuffer (i) {
  const buffer = Buffer.allocUnsafe(2)
  buffer.writeUInt8(i >> 8, 0)
  buffer.writeUInt8(i & 0x00FF, 0 + 1)

  return buffer
}

function generateCache () {
  for (let i = 0; i < max; i++) {
    cache[i] = generateBuffer(i)
  }
}

function genBufVariableByteInt (num) {
  const maxLength = 4 // max 4 bytes
  let digit = 0
  let pos = 0
  const buffer = Buffer.allocUnsafe(maxLength)

  do {
    digit = num % 128 | 0
    num = num / 128 | 0
    if (num > 0) digit = digit | 0x80

    buffer.writeUInt8(digit, pos++)
  } while (num > 0 && pos < maxLength)

  if (num > 0) {
    pos = 0
  }

  return SubOk ? buffer.subarray(0, pos) : buffer.slice(0, pos)
}

function generate4ByteBuffer (num) {
  const buffer = Buffer.allocUnsafe(4)
  buffer.writeUInt32BE(num, 0)
  return buffer
}

module.exports = {
  cache,
  generateCache,
  generateNumber: generateBuffer,
  genBufVariableByteInt,
  generate4ByteBuffer
}

}).call(this)}).call(this,require("buffer").Buffer)
},{"buffer":17}],42:[function(require,module,exports){
class Packet {
  constructor () {
    this.cmd = null
    this.retain = false
    this.qos = 0
    this.dup = false
    this.length = -1
    this.topic = null
    this.payload = null
  }
}

module.exports = Packet

},{}],43:[function(require,module,exports){
const bl = require('bl')
const EventEmitter = require('events')
const Packet = require('./packet')
const constants = require('./constants')
const debug = require('debug')('mqtt-packet:parser')

class Parser extends EventEmitter {
  constructor () {
    super()
    this.parser = this.constructor.parser
  }

  static parser (opt) {
    if (!(this instanceof Parser)) return (new Parser()).parser(opt)

    this.settings = opt || {}

    this._states = [
      '_parseHeader',
      '_parseLength',
      '_parsePayload',
      '_newPacket'
    ]

    this._resetState()
    return this
  }

  _resetState () {
    debug('_resetState: resetting packet, error, _list, and _stateCounter')
    this.packet = new Packet()
    this.error = null
    this._list = bl()
    this._stateCounter = 0
  }

  parse (buf) {
    if (this.error) this._resetState()

    this._list.append(buf)
    debug('parse: current state: %s', this._states[this._stateCounter])
    while ((this.packet.length !== -1 || this._list.length > 0) &&
      this[this._states[this._stateCounter]]() &&
      !this.error) {
      this._stateCounter++
      debug('parse: state complete. _stateCounter is now: %d', this._stateCounter)
      debug('parse: packet.length: %d, buffer list length: %d', this.packet.length, this._list.length)
      if (this._stateCounter >= this._states.length) this._stateCounter = 0
    }
    debug('parse: exited while loop. packet: %d, buffer list length: %d', this.packet.length, this._list.length)
    return this._list.length
  }

  _parseHeader () {
    // There is at least one byte in the buffer
    const zero = this._list.readUInt8(0)
    this.packet.cmd = constants.types[zero >> constants.CMD_SHIFT]
    this.packet.retain = (zero & constants.RETAIN_MASK) !== 0
    this.packet.qos = (zero >> constants.QOS_SHIFT) & constants.QOS_MASK
    this.packet.dup = (zero & constants.DUP_MASK) !== 0
    debug('_parseHeader: packet: %o', this.packet)

    this._list.consume(1)

    return true
  }

  _parseLength () {
    // There is at least one byte in the list
    const result = this._parseVarByteNum(true)

    if (result) {
      this.packet.length = result.value
      this._list.consume(result.bytes)
    }
    debug('_parseLength %d', result.value)
    return !!result
  }

  _parsePayload () {
    debug('_parsePayload: payload %O', this._list)
    let result = false

    // Do we have a payload? Do we have enough data to complete the payload?
    // PINGs have no payload
    if (this.packet.length === 0 || this._list.length >= this.packet.length) {
      this._pos = 0

      switch (this.packet.cmd) {
        case 'connect':
          this._parseConnect()
          break
        case 'connack':
          this._parseConnack()
          break
        case 'publish':
          this._parsePublish()
          break
        case 'puback':
        case 'pubrec':
        case 'pubrel':
        case 'pubcomp':
          this._parseConfirmation()
          break
        case 'subscribe':
          this._parseSubscribe()
          break
        case 'suback':
          this._parseSuback()
          break
        case 'unsubscribe':
          this._parseUnsubscribe()
          break
        case 'unsuback':
          this._parseUnsuback()
          break
        case 'pingreq':
        case 'pingresp':
          // These are empty, nothing to do
          break
        case 'disconnect':
          this._parseDisconnect()
          break
        case 'auth':
          this._parseAuth()
          break
        default:
          this._emitError(new Error('Not supported'))
      }

      result = true
    }
    debug('_parsePayload complete result: %s', result)
    return result
  }

  _parseConnect () {
    debug('_parseConnect')
    let topic // Will topic
    let payload // Will payload
    let password // Password
    let username // Username
    const flags = {}
    const packet = this.packet

    // Parse protocolId
    const protocolId = this._parseString()

    if (protocolId === null) return this._emitError(new Error('Cannot parse protocolId'))
    if (protocolId !== 'MQTT' && protocolId !== 'MQIsdp') {
      return this._emitError(new Error('Invalid protocolId'))
    }

    packet.protocolId = protocolId

    // Parse constants version number
    if (this._pos >= this._list.length) return this._emitError(new Error('Packet too short'))

    packet.protocolVersion = this._list.readUInt8(this._pos)

    if (packet.protocolVersion >= 128) {
      packet.bridgeMode = true
      packet.protocolVersion = packet.protocolVersion - 128
    }

    if (packet.protocolVersion !== 3 && packet.protocolVersion !== 4 && packet.protocolVersion !== 5) {
      return this._emitError(new Error('Invalid protocol version'))
    }

    this._pos++

    if (this._pos >= this._list.length) {
      return this._emitError(new Error('Packet too short'))
    }

    // Parse connect flags
    flags.username = (this._list.readUInt8(this._pos) & constants.USERNAME_MASK)
    flags.password = (this._list.readUInt8(this._pos) & constants.PASSWORD_MASK)
    flags.will = (this._list.readUInt8(this._pos) & constants.WILL_FLAG_MASK)

    if (flags.will) {
      packet.will = {}
      packet.will.retain = (this._list.readUInt8(this._pos) & constants.WILL_RETAIN_MASK) !== 0
      packet.will.qos = (this._list.readUInt8(this._pos) &
        constants.WILL_QOS_MASK) >> constants.WILL_QOS_SHIFT
    }

    packet.clean = (this._list.readUInt8(this._pos) & constants.CLEAN_SESSION_MASK) !== 0
    this._pos++

    // Parse keepalive
    packet.keepalive = this._parseNum()
    if (packet.keepalive === -1) return this._emitError(new Error('Packet too short'))

    // parse properties
    if (packet.protocolVersion === 5) {
      const properties = this._parseProperties()
      if (Object.getOwnPropertyNames(properties).length) {
        packet.properties = properties
      }
    }
    // Parse clientId
    const clientId = this._parseString()
    if (clientId === null) return this._emitError(new Error('Packet too short'))
    packet.clientId = clientId
    debug('_parseConnect: packet.clientId: %s', packet.clientId)

    if (flags.will) {
      if (packet.protocolVersion === 5) {
        const willProperties = this._parseProperties()
        if (Object.getOwnPropertyNames(willProperties).length) {
          packet.will.properties = willProperties
        }
      }
      // Parse will topic
      topic = this._parseString()
      if (topic === null) return this._emitError(new Error('Cannot parse will topic'))
      packet.will.topic = topic
      debug('_parseConnect: packet.will.topic: %s', packet.will.topic)

      // Parse will payload
      payload = this._parseBuffer()
      if (payload === null) return this._emitError(new Error('Cannot parse will payload'))
      packet.will.payload = payload
      debug('_parseConnect: packet.will.paylaod: %s', packet.will.payload)
    }

    // Parse username
    if (flags.username) {
      username = this._parseString()
      if (username === null) return this._emitError(new Error('Cannot parse username'))
      packet.username = username
      debug('_parseConnect: packet.username: %s', packet.username)
    }

    // Parse password
    if (flags.password) {
      password = this._parseBuffer()
      if (password === null) return this._emitError(new Error('Cannot parse password'))
      packet.password = password
    }
    // need for right parse auth packet and self set up
    this.settings = packet
    debug('_parseConnect: complete')
    return packet
  }

  _parseConnack () {
    debug('_parseConnack')
    const packet = this.packet

    if (this._list.length < 1) return null
    packet.sessionPresent = !!(this._list.readUInt8(this._pos++) & constants.SESSIONPRESENT_MASK)

    if (this.settings.protocolVersion === 5) {
      if (this._list.length >= 2) {
        packet.reasonCode = this._list.readUInt8(this._pos++)
      } else {
        packet.reasonCode = 0
      }
    } else {
      if (this._list.length < 2) return null
      packet.returnCode = this._list.readUInt8(this._pos++)
    }

    if (packet.returnCode === -1 || packet.reasonCode === -1) return this._emitError(new Error('Cannot parse return code'))
    // mqtt 5 properties
    if (this.settings.protocolVersion === 5) {
      const properties = this._parseProperties()
      if (Object.getOwnPropertyNames(properties).length) {
        packet.properties = properties
      }
    }
    debug('_parseConnack: complete')
  }

  _parsePublish () {
    debug('_parsePublish')
    const packet = this.packet
    packet.topic = this._parseString()

    if (packet.topic === null) return this._emitError(new Error('Cannot parse topic'))

    // Parse messageId
    if (packet.qos > 0) if (!this._parseMessageId()) { return }

    // Properties mqtt 5
    if (this.settings.protocolVersion === 5) {
      const properties = this._parseProperties()
      if (Object.getOwnPropertyNames(properties).length) {
        packet.properties = properties
      }
    }

    packet.payload = this._list.slice(this._pos, packet.length)
    debug('_parsePublish: payload from buffer list: %o', packet.payload)
  }

  _parseSubscribe () {
    debug('_parseSubscribe')
    const packet = this.packet
    let topic
    let options
    let qos
    let rh
    let rap
    let nl
    let subscription

    if (packet.qos !== 1) {
      return this._emitError(new Error('Wrong subscribe header'))
    }

    packet.subscriptions = []

    if (!this._parseMessageId()) { return }

    // Properties mqtt 5
    if (this.settings.protocolVersion === 5) {
      const properties = this._parseProperties()
      if (Object.getOwnPropertyNames(properties).length) {
        packet.properties = properties
      }
    }

    while (this._pos < packet.length) {
      // Parse topic
      topic = this._parseString()
      if (topic === null) return this._emitError(new Error('Cannot parse topic'))
      if (this._pos >= packet.length) return this._emitError(new Error('Malformed Subscribe Payload'))

      options = this._parseByte()
      qos = options & constants.SUBSCRIBE_OPTIONS_QOS_MASK
      nl = ((options >> constants.SUBSCRIBE_OPTIONS_NL_SHIFT) & constants.SUBSCRIBE_OPTIONS_NL_MASK) !== 0
      rap = ((options >> constants.SUBSCRIBE_OPTIONS_RAP_SHIFT) & constants.SUBSCRIBE_OPTIONS_RAP_MASK) !== 0
      rh = (options >> constants.SUBSCRIBE_OPTIONS_RH_SHIFT) & constants.SUBSCRIBE_OPTIONS_RH_MASK

      subscription = { topic, qos }

      // mqtt 5 options
      if (this.settings.protocolVersion === 5) {
        subscription.nl = nl
        subscription.rap = rap
        subscription.rh = rh
      } else if (this.settings.bridgeMode) {
        subscription.rh = 0
        subscription.rap = true
        subscription.nl = true
      }

      // Push pair to subscriptions
      debug('_parseSubscribe: push subscription `%s` to subscription', subscription)
      packet.subscriptions.push(subscription)
    }
  }

  _parseSuback () {
    debug('_parseSuback')
    const packet = this.packet
    this.packet.granted = []

    if (!this._parseMessageId()) { return }

    // Properties mqtt 5
    if (this.settings.protocolVersion === 5) {
      const properties = this._parseProperties()
      if (Object.getOwnPropertyNames(properties).length) {
        packet.properties = properties
      }
    }

    // Parse granted QoSes
    while (this._pos < this.packet.length) {
      this.packet.granted.push(this._list.readUInt8(this._pos++))
    }
  }

  _parseUnsubscribe () {
    debug('_parseUnsubscribe')
    const packet = this.packet

    packet.unsubscriptions = []

    // Parse messageId
    if (!this._parseMessageId()) { return }

    // Properties mqtt 5
    if (this.settings.protocolVersion === 5) {
      const properties = this._parseProperties()
      if (Object.getOwnPropertyNames(properties).length) {
        packet.properties = properties
      }
    }

    while (this._pos < packet.length) {
      // Parse topic
      const topic = this._parseString()
      if (topic === null) return this._emitError(new Error('Cannot parse topic'))

      // Push topic to unsubscriptions
      debug('_parseUnsubscribe: push topic `%s` to unsubscriptions', topic)
      packet.unsubscriptions.push(topic)
    }
  }

  _parseUnsuback () {
    debug('_parseUnsuback')
    const packet = this.packet
    if (!this._parseMessageId()) return this._emitError(new Error('Cannot parse messageId'))
    // Properties mqtt 5
    if (this.settings.protocolVersion === 5) {
      const properties = this._parseProperties()
      if (Object.getOwnPropertyNames(properties).length) {
        packet.properties = properties
      }
      // Parse granted QoSes
      packet.granted = []
      while (this._pos < this.packet.length) {
        this.packet.granted.push(this._list.readUInt8(this._pos++))
      }
    }
  }

  // parse packets like puback, pubrec, pubrel, pubcomp
  _parseConfirmation () {
    debug('_parseConfirmation: packet.cmd: `%s`', this.packet.cmd)
    const packet = this.packet

    this._parseMessageId()

    if (this.settings.protocolVersion === 5) {
      if (packet.length > 2) {
        // response code
        packet.reasonCode = this._parseByte()
        debug('_parseConfirmation: packet.reasonCode `%d`', packet.reasonCode)
      } else {
        packet.reasonCode = 0
      }

      if (packet.length > 3) {
        // properies mqtt 5
        const properties = this._parseProperties()
        if (Object.getOwnPropertyNames(properties).length) {
          packet.properties = properties
        }
      }
    }

    return true
  }

  // parse disconnect packet
  _parseDisconnect () {
    const packet = this.packet
    debug('_parseDisconnect')

    if (this.settings.protocolVersion === 5) {
      // response code
      if (this._list.length > 0) {
        packet.reasonCode = this._parseByte()
      } else {
        packet.reasonCode = 0
      }
      // properies mqtt 5
      const properties = this._parseProperties()
      if (Object.getOwnPropertyNames(properties).length) {
        packet.properties = properties
      }
    }

    debug('_parseDisconnect result: true')
    return true
  }

  // parse auth packet
  _parseAuth () {
    debug('_parseAuth')
    const packet = this.packet

    if (this.settings.protocolVersion !== 5) {
      return this._emitError(new Error('Not supported auth packet for this version MQTT'))
    }

    // response code
    packet.reasonCode = this._parseByte()
    // properies mqtt 5
    const properties = this._parseProperties()
    if (Object.getOwnPropertyNames(properties).length) {
      packet.properties = properties
    }

    debug('_parseAuth: result: true')
    return true
  }

  _parseMessageId () {
    const packet = this.packet

    packet.messageId = this._parseNum()

    if (packet.messageId === null) {
      this._emitError(new Error('Cannot parse messageId'))
      return false
    }

    debug('_parseMessageId: packet.messageId %d', packet.messageId)
    return true
  }

  _parseString (maybeBuffer) {
    const length = this._parseNum()
    const end = length + this._pos

    if (length === -1 || end > this._list.length || end > this.packet.length) return null

    const result = this._list.toString('utf8', this._pos, end)
    this._pos += length
    debug('_parseString: result: %s', result)
    return result
  }

  _parseStringPair () {
    debug('_parseStringPair')
    return {
      name: this._parseString(),
      value: this._parseString()
    }
  }

  _parseBuffer () {
    const length = this._parseNum()
    const end = length + this._pos

    if (length === -1 || end > this._list.length || end > this.packet.length) return null

    const result = this._list.slice(this._pos, end)

    this._pos += length
    debug('_parseBuffer: result: %o', result)
    return result
  }

  _parseNum () {
    if (this._list.length - this._pos < 2) return -1

    const result = this._list.readUInt16BE(this._pos)
    this._pos += 2
    debug('_parseNum: result: %s', result)
    return result
  }

  _parse4ByteNum () {
    if (this._list.length - this._pos < 4) return -1

    const result = this._list.readUInt32BE(this._pos)
    this._pos += 4
    debug('_parse4ByteNum: result: %s', result)
    return result
  }

  _parseVarByteNum (fullInfoFlag) {
    debug('_parseVarByteNum')
    const maxBytes = 4
    let bytes = 0
    let mul = 1
    let value = 0
    let result = false
    let current
    const padding = this._pos ? this._pos : 0

    while (bytes < maxBytes && (padding + bytes) < this._list.length) {
      current = this._list.readUInt8(padding + bytes++)
      value += mul * (current & constants.VARBYTEINT_MASK)
      mul *= 0x80

      if ((current & constants.VARBYTEINT_FIN_MASK) === 0) {
        result = true
        break
      }
      if (this._list.length <= bytes) {
        break
      }
    }

    if (!result && bytes === maxBytes && this._list.length >= bytes) {
      this._emitError(new Error('Invalid variable byte integer'))
    }

    if (padding) {
      this._pos += bytes
    }

    result = result
      ? fullInfoFlag ? {
        bytes,
        value
      } : value
      : false

    debug('_parseVarByteNum: result: %o', result)
    return result
  }

  _parseByte () {
    let result
    if (this._pos < this._list.length) {
      result = this._list.readUInt8(this._pos)
      this._pos++
    }
    debug('_parseByte: result: %o', result)
    return result
  }

  _parseByType (type) {
    debug('_parseByType: type: %s', type)
    switch (type) {
      case 'byte': {
        return this._parseByte() !== 0
      }
      case 'int8': {
        return this._parseByte()
      }
      case 'int16': {
        return this._parseNum()
      }
      case 'int32': {
        return this._parse4ByteNum()
      }
      case 'var': {
        return this._parseVarByteNum()
      }
      case 'string': {
        return this._parseString()
      }
      case 'pair': {
        return this._parseStringPair()
      }
      case 'binary': {
        return this._parseBuffer()
      }
    }
  }

  _parseProperties () {
    debug('_parseProperties')
    const length = this._parseVarByteNum()
    const start = this._pos
    const end = start + length
    const result = {}
    while (this._pos < end) {
      const type = this._parseByte()
      if (!type) {
        this._emitError(new Error('Cannot parse property code type'))
        return false
      }
      const name = constants.propertiesCodes[type]
      if (!name) {
        this._emitError(new Error('Unknown property'))
        return false
      }
      // user properties process
      if (name === 'userProperties') {
        if (!result[name]) {
          result[name] = Object.create(null)
        }
        const currentUserProperty = this._parseByType(constants.propertiesTypes[name])
        if (result[name][currentUserProperty.name]) {
          if (Array.isArray(result[name][currentUserProperty.name])) {
            result[name][currentUserProperty.name].push(currentUserProperty.value)
          } else {
            const currentValue = result[name][currentUserProperty.name]
            result[name][currentUserProperty.name] = [currentValue]
            result[name][currentUserProperty.name].push(currentUserProperty.value)
          }
        } else {
          result[name][currentUserProperty.name] = currentUserProperty.value
        }
        continue
      }
      if (result[name]) {
        if (Array.isArray(result[name])) {
          result[name].push(this._parseByType(constants.propertiesTypes[name]))
        } else {
          result[name] = [result[name]]
          result[name].push(this._parseByType(constants.propertiesTypes[name]))
        }
      } else {
        result[name] = this._parseByType(constants.propertiesTypes[name])
      }
    }
    return result
  }

  _newPacket () {
    debug('_newPacket')
    if (this.packet) {
      this._list.consume(this.packet.length)
      debug('_newPacket: parser emit packet: packet.cmd: %s, packet.payload: %s, packet.length: %d', this.packet.cmd, this.packet.payload, this.packet.length)
      this.emit('packet', this.packet)
    }
    debug('_newPacket: new packet')
    this.packet = new Packet()

    this._pos = 0

    return true
  }

  _emitError (err) {
    debug('_emitError')
    this.error = err
    this.emit('error', err)
  }
}

module.exports = Parser

},{"./constants":38,"./packet":42,"bl":15,"debug":18,"events":22}],44:[function(require,module,exports){
(function (Buffer){(function (){
const protocol = require('./constants')
const empty = Buffer.allocUnsafe(0)
const zeroBuf = Buffer.from([0])
const numbers = require('./numbers')
const nextTick = require('process-nextick-args').nextTick
const debug = require('debug')('mqtt-packet:writeToStream')

const numCache = numbers.cache
const generateNumber = numbers.generateNumber
const generateCache = numbers.generateCache
const genBufVariableByteInt = numbers.genBufVariableByteInt
const generate4ByteBuffer = numbers.generate4ByteBuffer
let writeNumber = writeNumberCached
let toGenerate = true

function generate (packet, stream, opts) {
  debug('generate called')
  if (stream.cork) {
    stream.cork()
    nextTick(uncork, stream)
  }

  if (toGenerate) {
    toGenerate = false
    generateCache()
  }
  debug('generate: packet.cmd: %s', packet.cmd)
  switch (packet.cmd) {
    case 'connect':
      return connect(packet, stream, opts)
    case 'connack':
      return connack(packet, stream, opts)
    case 'publish':
      return publish(packet, stream, opts)
    case 'puback':
    case 'pubrec':
    case 'pubrel':
    case 'pubcomp':
      return confirmation(packet, stream, opts)
    case 'subscribe':
      return subscribe(packet, stream, opts)
    case 'suback':
      return suback(packet, stream, opts)
    case 'unsubscribe':
      return unsubscribe(packet, stream, opts)
    case 'unsuback':
      return unsuback(packet, stream, opts)
    case 'pingreq':
    case 'pingresp':
      return emptyPacket(packet, stream, opts)
    case 'disconnect':
      return disconnect(packet, stream, opts)
    case 'auth':
      return auth(packet, stream, opts)
    default:
      stream.emit('error', new Error('Unknown command'))
      return false
  }
}
/**
 * Controls numbers cache.
 * Set to "false" to allocate buffers on-the-flight instead of pre-generated cache
 */
Object.defineProperty(generate, 'cacheNumbers', {
  get () {
    return writeNumber === writeNumberCached
  },
  set (value) {
    if (value) {
      if (!numCache || Object.keys(numCache).length === 0) toGenerate = true
      writeNumber = writeNumberCached
    } else {
      toGenerate = false
      writeNumber = writeNumberGenerated
    }
  }
})

function uncork (stream) {
  stream.uncork()
}

function connect (packet, stream, opts) {
  const settings = packet || {}
  const protocolId = settings.protocolId || 'MQTT'
  let protocolVersion = settings.protocolVersion || 4
  const will = settings.will
  let clean = settings.clean
  const keepalive = settings.keepalive || 0
  const clientId = settings.clientId || ''
  const username = settings.username
  const password = settings.password
  /* mqtt5 new oprions */
  const properties = settings.properties

  if (clean === undefined) clean = true

  let length = 0

  // Must be a string and non-falsy
  if (!protocolId ||
     (typeof protocolId !== 'string' && !Buffer.isBuffer(protocolId))) {
    stream.emit('error', new Error('Invalid protocolId'))
    return false
  } else length += protocolId.length + 2

  // Must be 3 or 4 or 5
  if (protocolVersion !== 3 && protocolVersion !== 4 && protocolVersion !== 5) {
    stream.emit('error', new Error('Invalid protocol version'))
    return false
  } else length += 1

  // ClientId might be omitted in 3.1.1 and 5, but only if cleanSession is set to 1
  if ((typeof clientId === 'string' || Buffer.isBuffer(clientId)) &&
     (clientId || protocolVersion >= 4) && (clientId || clean)) {
    length += Buffer.byteLength(clientId) + 2
  } else {
    if (protocolVersion < 4) {
      stream.emit('error', new Error('clientId must be supplied before 3.1.1'))
      return false
    }
    if ((clean * 1) === 0) {
      stream.emit('error', new Error('clientId must be given if cleanSession set to 0'))
      return false
    }
  }

  // Must be a two byte number
  if (typeof keepalive !== 'number' ||
      keepalive < 0 ||
      keepalive > 65535 ||
      keepalive % 1 !== 0) {
    stream.emit('error', new Error('Invalid keepalive'))
    return false
  } else length += 2

  // Connect flags
  length += 1

  // Properties
  if (protocolVersion === 5) {
    var propertiesData = getProperties(stream, properties)
    if (!propertiesData) { return false }
    length += propertiesData.length
  }

  // If will exists...
  if (will) {
    // It must be an object
    if (typeof will !== 'object') {
      stream.emit('error', new Error('Invalid will'))
      return false
    }
    // It must have topic typeof string
    if (!will.topic || typeof will.topic !== 'string') {
      stream.emit('error', new Error('Invalid will topic'))
      return false
    } else {
      length += Buffer.byteLength(will.topic) + 2
    }

    // Payload
    length += 2 // payload length
    if (will.payload) {
      if (will.payload.length >= 0) {
        if (typeof will.payload === 'string') {
          length += Buffer.byteLength(will.payload)
        } else {
          length += will.payload.length
        }
      } else {
        stream.emit('error', new Error('Invalid will payload'))
        return false
      }
    }
    // will properties
    var willProperties = {}
    if (protocolVersion === 5) {
      willProperties = getProperties(stream, will.properties)
      if (!willProperties) { return false }
      length += willProperties.length
    }
  }

  // Username
  let providedUsername = false
  if (username != null) {
    if (isStringOrBuffer(username)) {
      providedUsername = true
      length += Buffer.byteLength(username) + 2
    } else {
      stream.emit('error', new Error('Invalid username'))
      return false
    }
  }

  // Password
  if (password != null) {
    if (!providedUsername) {
      stream.emit('error', new Error('Username is required to use password'))
      return false
    }

    if (isStringOrBuffer(password)) {
      length += byteLength(password) + 2
    } else {
      stream.emit('error', new Error('Invalid password'))
      return false
    }
  }

  // Generate header
  stream.write(protocol.CONNECT_HEADER)

  // Generate length
  writeVarByteInt(stream, length)

  // Generate protocol ID
  writeStringOrBuffer(stream, protocolId)

  if (settings.bridgeMode) {
    protocolVersion += 128
  }

  stream.write(
    protocolVersion === 131
      ? protocol.VERSION131
      : protocolVersion === 132
        ? protocol.VERSION132
        : protocolVersion === 4
          ? protocol.VERSION4
          : protocolVersion === 5
            ? protocol.VERSION5
            : protocol.VERSION3
  )

  // Connect flags
  let flags = 0
  flags |= (username != null) ? protocol.USERNAME_MASK : 0
  flags |= (password != null) ? protocol.PASSWORD_MASK : 0
  flags |= (will && will.retain) ? protocol.WILL_RETAIN_MASK : 0
  flags |= (will && will.qos) ? will.qos << protocol.WILL_QOS_SHIFT : 0
  flags |= will ? protocol.WILL_FLAG_MASK : 0
  flags |= clean ? protocol.CLEAN_SESSION_MASK : 0

  stream.write(Buffer.from([flags]))

  // Keepalive
  writeNumber(stream, keepalive)

  // Properties
  if (protocolVersion === 5) {
    propertiesData.write()
  }

  // Client ID
  writeStringOrBuffer(stream, clientId)

  // Will
  if (will) {
    if (protocolVersion === 5) {
      willProperties.write()
    }
    writeString(stream, will.topic)
    writeStringOrBuffer(stream, will.payload)
  }

  // Username and password
  if (username != null) {
    writeStringOrBuffer(stream, username)
  }
  if (password != null) {
    writeStringOrBuffer(stream, password)
  }
  // This is a small packet that happens only once on a stream
  // We assume the stream is always free to receive more data after this
  return true
}

function connack (packet, stream, opts) {
  const version = opts ? opts.protocolVersion : 4
  const settings = packet || {}
  const rc = version === 5 ? settings.reasonCode : settings.returnCode
  const properties = settings.properties
  let length = 2 // length of rc and sessionHeader

  // Check return code
  if (typeof rc !== 'number') {
    stream.emit('error', new Error('Invalid return code'))
    return false
  }
  // mqtt5 properties
  let propertiesData = null
  if (version === 5) {
    propertiesData = getProperties(stream, properties)
    if (!propertiesData) { return false }
    length += propertiesData.length
  }

  stream.write(protocol.CONNACK_HEADER)
  // length
  writeVarByteInt(stream, length)
  stream.write(settings.sessionPresent ? protocol.SESSIONPRESENT_HEADER : zeroBuf)

  stream.write(Buffer.from([rc]))
  if (propertiesData != null) {
    propertiesData.write()
  }
  return true
}

function publish (packet, stream, opts) {
  debug('publish: packet: %o', packet)
  const version = opts ? opts.protocolVersion : 4
  const settings = packet || {}
  const qos = settings.qos || 0
  const retain = settings.retain ? protocol.RETAIN_MASK : 0
  const topic = settings.topic
  const payload = settings.payload || empty
  const id = settings.messageId
  const properties = settings.properties

  let length = 0

  // Topic must be a non-empty string or Buffer
  if (typeof topic === 'string') length += Buffer.byteLength(topic) + 2
  else if (Buffer.isBuffer(topic)) length += topic.length + 2
  else {
    stream.emit('error', new Error('Invalid topic'))
    return false
  }

  // Get the payload length
  if (!Buffer.isBuffer(payload)) length += Buffer.byteLength(payload)
  else length += payload.length

  // Message ID must a number if qos > 0
  if (qos && typeof id !== 'number') {
    stream.emit('error', new Error('Invalid messageId'))
    return false
  } else if (qos) length += 2

  // mqtt5 properties
  let propertiesData = null
  if (version === 5) {
    propertiesData = getProperties(stream, properties)
    if (!propertiesData) { return false }
    length += propertiesData.length
  }

  // Header
  stream.write(protocol.PUBLISH_HEADER[qos][settings.dup ? 1 : 0][retain ? 1 : 0])

  // Remaining length
  writeVarByteInt(stream, length)

  // Topic
  writeNumber(stream, byteLength(topic))
  stream.write(topic)

  // Message ID
  if (qos > 0) writeNumber(stream, id)

  // Properties
  if (propertiesData != null) {
    propertiesData.write()
  }

  // Payload
  debug('publish: payload: %o', payload)
  return stream.write(payload)
}

/* Puback, pubrec, pubrel and pubcomp */
function confirmation (packet, stream, opts) {
  const version = opts ? opts.protocolVersion : 4
  const settings = packet || {}
  const type = settings.cmd || 'puback'
  const id = settings.messageId
  const dup = (settings.dup && type === 'pubrel') ? protocol.DUP_MASK : 0
  let qos = 0
  const reasonCode = settings.reasonCode
  const properties = settings.properties
  let length = version === 5 ? 3 : 2

  if (type === 'pubrel') qos = 1

  // Check message ID
  if (typeof id !== 'number') {
    stream.emit('error', new Error('Invalid messageId'))
    return false
  }

  // properies mqtt 5
  let propertiesData = null
  if (version === 5) {
    // Confirm should not add empty property length with no properties (rfc 3.4.2.2.1)
    if (typeof properties === 'object') {
      propertiesData = getPropertiesByMaximumPacketSize(stream, properties, opts, length)
      if (!propertiesData) { return false }
      length += propertiesData.length
    }
  }

  // Header
  stream.write(protocol.ACKS[type][qos][dup][0])

  // Length
  writeVarByteInt(stream, length)

  // Message ID
  writeNumber(stream, id)

  // reason code in header
  if (version === 5) {
    stream.write(Buffer.from([reasonCode]))
  }

  // properies mqtt 5
  if (propertiesData !== null) {
    propertiesData.write()
  }
  return true
}

function subscribe (packet, stream, opts) {
  debug('subscribe: packet: ')
  const version = opts ? opts.protocolVersion : 4
  const settings = packet || {}
  const dup = settings.dup ? protocol.DUP_MASK : 0
  const id = settings.messageId
  const subs = settings.subscriptions
  const properties = settings.properties

  let length = 0

  // Check message ID
  if (typeof id !== 'number') {
    stream.emit('error', new Error('Invalid messageId'))
    return false
  } else length += 2

  // properies mqtt 5
  let propertiesData = null
  if (version === 5) {
    propertiesData = getProperties(stream, properties)
    if (!propertiesData) { return false }
    length += propertiesData.length
  }

  // Check subscriptions
  if (typeof subs === 'object' && subs.length) {
    for (let i = 0; i < subs.length; i += 1) {
      const itopic = subs[i].topic
      const iqos = subs[i].qos

      if (typeof itopic !== 'string') {
        stream.emit('error', new Error('Invalid subscriptions - invalid topic'))
        return false
      }
      if (typeof iqos !== 'number') {
        stream.emit('error', new Error('Invalid subscriptions - invalid qos'))
        return false
      }

      if (version === 5) {
        const nl = subs[i].nl || false
        if (typeof nl !== 'boolean') {
          stream.emit('error', new Error('Invalid subscriptions - invalid No Local'))
          return false
        }
        const rap = subs[i].rap || false
        if (typeof rap !== 'boolean') {
          stream.emit('error', new Error('Invalid subscriptions - invalid Retain as Published'))
          return false
        }
        const rh = subs[i].rh || 0
        if (typeof rh !== 'number' || rh > 2) {
          stream.emit('error', new Error('Invalid subscriptions - invalid Retain Handling'))
          return false
        }
      }

      length += Buffer.byteLength(itopic) + 2 + 1
    }
  } else {
    stream.emit('error', new Error('Invalid subscriptions'))
    return false
  }

  // Generate header
  debug('subscribe: writing to stream: %o', protocol.SUBSCRIBE_HEADER)
  stream.write(protocol.SUBSCRIBE_HEADER[1][dup ? 1 : 0][0])

  // Generate length
  writeVarByteInt(stream, length)

  // Generate message ID
  writeNumber(stream, id)

  // properies mqtt 5
  if (propertiesData !== null) {
    propertiesData.write()
  }

  let result = true

  // Generate subs
  for (const sub of subs) {
    const jtopic = sub.topic
    const jqos = sub.qos
    const jnl = +sub.nl
    const jrap = +sub.rap
    const jrh = sub.rh
    let joptions

    // Write topic string
    writeString(stream, jtopic)

    // options process
    joptions = protocol.SUBSCRIBE_OPTIONS_QOS[jqos]
    if (version === 5) {
      joptions |= jnl ? protocol.SUBSCRIBE_OPTIONS_NL : 0
      joptions |= jrap ? protocol.SUBSCRIBE_OPTIONS_RAP : 0
      joptions |= jrh ? protocol.SUBSCRIBE_OPTIONS_RH[jrh] : 0
    }
    // Write options
    result = stream.write(Buffer.from([joptions]))
  }

  return result
}

function suback (packet, stream, opts) {
  const version = opts ? opts.protocolVersion : 4
  const settings = packet || {}
  const id = settings.messageId
  const granted = settings.granted
  const properties = settings.properties
  let length = 0

  // Check message ID
  if (typeof id !== 'number') {
    stream.emit('error', new Error('Invalid messageId'))
    return false
  } else length += 2

  // Check granted qos vector
  if (typeof granted === 'object' && granted.length) {
    for (let i = 0; i < granted.length; i += 1) {
      if (typeof granted[i] !== 'number') {
        stream.emit('error', new Error('Invalid qos vector'))
        return false
      }
      length += 1
    }
  } else {
    stream.emit('error', new Error('Invalid qos vector'))
    return false
  }

  // properies mqtt 5
  let propertiesData = null
  if (version === 5) {
    propertiesData = getPropertiesByMaximumPacketSize(stream, properties, opts, length)
    if (!propertiesData) { return false }
    length += propertiesData.length
  }

  // header
  stream.write(protocol.SUBACK_HEADER)

  // Length
  writeVarByteInt(stream, length)

  // Message ID
  writeNumber(stream, id)

  // properies mqtt 5
  if (propertiesData !== null) {
    propertiesData.write()
  }

  return stream.write(Buffer.from(granted))
}

function unsubscribe (packet, stream, opts) {
  const version = opts ? opts.protocolVersion : 4
  const settings = packet || {}
  const id = settings.messageId
  const dup = settings.dup ? protocol.DUP_MASK : 0
  const unsubs = settings.unsubscriptions
  const properties = settings.properties

  let length = 0

  // Check message ID
  if (typeof id !== 'number') {
    stream.emit('error', new Error('Invalid messageId'))
    return false
  } else {
    length += 2
  }
  // Check unsubs
  if (typeof unsubs === 'object' && unsubs.length) {
    for (let i = 0; i < unsubs.length; i += 1) {
      if (typeof unsubs[i] !== 'string') {
        stream.emit('error', new Error('Invalid unsubscriptions'))
        return false
      }
      length += Buffer.byteLength(unsubs[i]) + 2
    }
  } else {
    stream.emit('error', new Error('Invalid unsubscriptions'))
    return false
  }
  // properies mqtt 5
  let propertiesData = null
  if (version === 5) {
    propertiesData = getProperties(stream, properties)
    if (!propertiesData) { return false }
    length += propertiesData.length
  }

  // Header
  stream.write(protocol.UNSUBSCRIBE_HEADER[1][dup ? 1 : 0][0])

  // Length
  writeVarByteInt(stream, length)

  // Message ID
  writeNumber(stream, id)

  // properies mqtt 5
  if (propertiesData !== null) {
    propertiesData.write()
  }

  // Unsubs
  let result = true
  for (let j = 0; j < unsubs.length; j++) {
    result = writeString(stream, unsubs[j])
  }

  return result
}

function unsuback (packet, stream, opts) {
  const version = opts ? opts.protocolVersion : 4
  const settings = packet || {}
  const id = settings.messageId
  const dup = settings.dup ? protocol.DUP_MASK : 0
  const granted = settings.granted
  const properties = settings.properties
  const type = settings.cmd
  const qos = 0

  let length = 2

  // Check message ID
  if (typeof id !== 'number') {
    stream.emit('error', new Error('Invalid messageId'))
    return false
  }

  // Check granted
  if (version === 5) {
    if (typeof granted === 'object' && granted.length) {
      for (let i = 0; i < granted.length; i += 1) {
        if (typeof granted[i] !== 'number') {
          stream.emit('error', new Error('Invalid qos vector'))
          return false
        }
        length += 1
      }
    } else {
      stream.emit('error', new Error('Invalid qos vector'))
      return false
    }
  }

  // properies mqtt 5
  let propertiesData = null
  if (version === 5) {
    propertiesData = getPropertiesByMaximumPacketSize(stream, properties, opts, length)
    if (!propertiesData) { return false }
    length += propertiesData.length
  }

  // Header
  stream.write(protocol.ACKS[type][qos][dup][0])

  // Length
  writeVarByteInt(stream, length)

  // Message ID
  writeNumber(stream, id)

  // properies mqtt 5
  if (propertiesData !== null) {
    propertiesData.write()
  }

  // payload
  if (version === 5) {
    stream.write(Buffer.from(granted))
  }
  return true
}

function emptyPacket (packet, stream, opts) {
  return stream.write(protocol.EMPTY[packet.cmd])
}

function disconnect (packet, stream, opts) {
  const version = opts ? opts.protocolVersion : 4
  const settings = packet || {}
  const reasonCode = settings.reasonCode
  const properties = settings.properties
  let length = version === 5 ? 1 : 0

  // properies mqtt 5
  let propertiesData = null
  if (version === 5) {
    propertiesData = getPropertiesByMaximumPacketSize(stream, properties, opts, length)
    if (!propertiesData) { return false }
    length += propertiesData.length
  }

  // Header
  stream.write(Buffer.from([protocol.codes.disconnect << 4]))

  // Length
  writeVarByteInt(stream, length)

  // reason code in header
  if (version === 5) {
    stream.write(Buffer.from([reasonCode]))
  }

  // properies mqtt 5
  if (propertiesData !== null) {
    propertiesData.write()
  }

  return true
}

function auth (packet, stream, opts) {
  const version = opts ? opts.protocolVersion : 4
  const settings = packet || {}
  const reasonCode = settings.reasonCode
  const properties = settings.properties
  let length = version === 5 ? 1 : 0

  if (version !== 5) stream.emit('error', new Error('Invalid mqtt version for auth packet'))

  // properies mqtt 5
  const propertiesData = getPropertiesByMaximumPacketSize(stream, properties, opts, length)
  if (!propertiesData) { return false }
  length += propertiesData.length

  // Header
  stream.write(Buffer.from([protocol.codes.auth << 4]))

  // Length
  writeVarByteInt(stream, length)

  // reason code in header
  stream.write(Buffer.from([reasonCode]))

  // properies mqtt 5
  if (propertiesData !== null) {
    propertiesData.write()
  }
  return true
}

/**
 * writeVarByteInt - write an MQTT style variable byte integer to the buffer
 *
 * @param <Buffer> buffer - destination
 * @param <Number> pos - offset
 * @param <Number> length - length (>0)
 * @returns <Number> number of bytes written
 *
 * @api private
 */

const varByteIntCache = {}
function writeVarByteInt (stream, num) {
  if (num > protocol.VARBYTEINT_MAX) {
    stream.emit('error', new Error(`Invalid variable byte integer: ${num}`))
    return false
  }

  let buffer = varByteIntCache[num]

  if (!buffer) {
    buffer = genBufVariableByteInt(num)
    if (num < 16384) varByteIntCache[num] = buffer
  }
  debug('writeVarByteInt: writing to stream: %o', buffer)
  return stream.write(buffer)
}

/**
 * writeString - write a utf8 string to the buffer
 *
 * @param <Buffer> buffer - destination
 * @param <Number> pos - offset
 * @param <String> string - string to write
 * @return <Number> number of bytes written
 *
 * @api private
 */

function writeString (stream, string) {
  const strlen = Buffer.byteLength(string)
  writeNumber(stream, strlen)

  debug('writeString: %s', string)
  return stream.write(string, 'utf8')
}

/**
 * writeStringPair - write a utf8 string pairs to the buffer
 *
 * @param <Buffer> buffer - destination
 * @param <String> name - string name to write
 * @param <String> value - string value to write
 * @return <Number> number of bytes written
 *
 * @api private
 */
function writeStringPair (stream, name, value) {
  writeString(stream, name)
  writeString(stream, value)
}

/**
 * writeNumber - write a two byte number to the buffer
 *
 * @param <Buffer> buffer - destination
 * @param <Number> pos - offset
 * @param <String> number - number to write
 * @return <Number> number of bytes written
 *
 * @api private
 */
function writeNumberCached (stream, number) {
  debug('writeNumberCached: number: %d', number)
  debug('writeNumberCached: %o', numCache[number])
  return stream.write(numCache[number])
}
function writeNumberGenerated (stream, number) {
  const generatedNumber = generateNumber(number)
  debug('writeNumberGenerated: %o', generatedNumber)
  return stream.write(generatedNumber)
}
function write4ByteNumber (stream, number) {
  const generated4ByteBuffer = generate4ByteBuffer(number)
  debug('write4ByteNumber: %o', generated4ByteBuffer)
  return stream.write(generated4ByteBuffer)
}
/**
 * writeStringOrBuffer - write a String or Buffer with the its length prefix
 *
 * @param <Buffer> buffer - destination
 * @param <Number> pos - offset
 * @param <String> toWrite - String or Buffer
 * @return <Number> number of bytes written
 */
function writeStringOrBuffer (stream, toWrite) {
  if (typeof toWrite === 'string') {
    writeString(stream, toWrite)
  } else if (toWrite) {
    writeNumber(stream, toWrite.length)
    stream.write(toWrite)
  } else writeNumber(stream, 0)
}

function getProperties (stream, properties) {
  /* connect properties */
  if (typeof properties !== 'object' || properties.length != null) {
    return {
      length: 1,
      write () {
        writeProperties(stream, {}, 0)
      }
    }
  }
  let propertiesLength = 0
  function getLengthProperty (name, value) {
    const type = protocol.propertiesTypes[name]
    let length = 0
    switch (type) {
      case 'byte': {
        if (typeof value !== 'boolean') {
          stream.emit('error', new Error(`Invalid ${name}: ${value}`))
          return false
        }
        length += 1 + 1
        break
      }
      case 'int8': {
        if (typeof value !== 'number' || value < 0 || value > 0xff) {
          stream.emit('error', new Error(`Invalid ${name}: ${value}`))
          return false
        }
        length += 1 + 1
        break
      }
      case 'binary': {
        if (value && value === null) {
          stream.emit('error', new Error(`Invalid ${name}: ${value}`))
          return false
        }
        length += 1 + Buffer.byteLength(value) + 2
        break
      }
      case 'int16': {
        if (typeof value !== 'number' || value < 0 || value > 0xffff) {
          stream.emit('error', new Error(`Invalid ${name}: ${value}`))
          return false
        }
        length += 1 + 2
        break
      }
      case 'int32': {
        if (typeof value !== 'number' || value < 0 || value > 0xffffffff) {
          stream.emit('error', new Error(`Invalid ${name}: ${value}`))
          return false
        }
        length += 1 + 4
        break
      }
      case 'var': {
        // var byte integer is max 24 bits packed in 32 bits
        if (typeof value !== 'number' || value < 0 || value > 0x0fffffff) {
          stream.emit('error', new Error(`Invalid ${name}: ${value}`))
          return false
        }
        length += 1 + Buffer.byteLength(genBufVariableByteInt(value))
        break
      }
      case 'string': {
        if (typeof value !== 'string') {
          stream.emit('error', new Error(`Invalid ${name}: ${value}`))
          return false
        }
        length += 1 + 2 + Buffer.byteLength(value.toString())
        break
      }
      case 'pair': {
        if (typeof value !== 'object') {
          stream.emit('error', new Error(`Invalid ${name}: ${value}`))
          return false
        }
        length += Object.getOwnPropertyNames(value).reduce((result, name) => {
          const currentValue = value[name]
          if (Array.isArray(currentValue)) {
            result += currentValue.reduce((currentLength, value) => {
              currentLength += 1 + 2 + Buffer.byteLength(name.toString()) + 2 + Buffer.byteLength(value.toString())
              return currentLength
            }, 0)
          } else {
            result += 1 + 2 + Buffer.byteLength(name.toString()) + 2 + Buffer.byteLength(value[name].toString())
          }
          return result
        }, 0)
        break
      }
      default: {
        stream.emit('error', new Error(`Invalid property ${name}: ${value}`))
        return false
      }
    }
    return length
  }
  if (properties) {
    for (const propName in properties) {
      let propLength = 0
      let propValueLength = 0
      const propValue = properties[propName]
      if (Array.isArray(propValue)) {
        for (let valueIndex = 0; valueIndex < propValue.length; valueIndex++) {
          propValueLength = getLengthProperty(propName, propValue[valueIndex])
          if (!propValueLength) { return false }
          propLength += propValueLength
        }
      } else {
        propValueLength = getLengthProperty(propName, propValue)
        if (!propValueLength) { return false }
        propLength = propValueLength
      }
      if (!propLength) return false
      propertiesLength += propLength
    }
  }
  const propertiesLengthLength = Buffer.byteLength(genBufVariableByteInt(propertiesLength))

  return {
    length: propertiesLengthLength + propertiesLength,
    write () {
      writeProperties(stream, properties, propertiesLength)
    }
  }
}

function getPropertiesByMaximumPacketSize (stream, properties, opts, length) {
  const mayEmptyProps = ['reasonString', 'userProperties']
  const maximumPacketSize = opts && opts.properties && opts.properties.maximumPacketSize ? opts.properties.maximumPacketSize : 0

  let propertiesData = getProperties(stream, properties)
  if (maximumPacketSize) {
    while (length + propertiesData.length > maximumPacketSize) {
      const currentMayEmptyProp = mayEmptyProps.shift()
      if (currentMayEmptyProp && properties[currentMayEmptyProp]) {
        delete properties[currentMayEmptyProp]
        propertiesData = getProperties(stream, properties)
      } else {
        return false
      }
    }
  }
  return propertiesData
}

function writeProperty (stream, propName, value) {
  const type = protocol.propertiesTypes[propName]
  switch (type) {
    case 'byte': {
      stream.write(Buffer.from([protocol.properties[propName]]))
      stream.write(Buffer.from([+value]))
      break
    }
    case 'int8': {
      stream.write(Buffer.from([protocol.properties[propName]]))
      stream.write(Buffer.from([value]))
      break
    }
    case 'binary': {
      stream.write(Buffer.from([protocol.properties[propName]]))
      writeStringOrBuffer(stream, value)
      break
    }
    case 'int16': {
      stream.write(Buffer.from([protocol.properties[propName]]))
      writeNumber(stream, value)
      break
    }
    case 'int32': {
      stream.write(Buffer.from([protocol.properties[propName]]))
      write4ByteNumber(stream, value)
      break
    }
    case 'var': {
      stream.write(Buffer.from([protocol.properties[propName]]))
      writeVarByteInt(stream, value)
      break
    }
    case 'string': {
      stream.write(Buffer.from([protocol.properties[propName]]))
      writeString(stream, value)
      break
    }
    case 'pair': {
      Object.getOwnPropertyNames(value).forEach(name => {
        const currentValue = value[name]
        if (Array.isArray(currentValue)) {
          currentValue.forEach(value => {
            stream.write(Buffer.from([protocol.properties[propName]]))
            writeStringPair(stream, name.toString(), value.toString())
          })
        } else {
          stream.write(Buffer.from([protocol.properties[propName]]))
          writeStringPair(stream, name.toString(), currentValue.toString())
        }
      })
      break
    }
    default: {
      stream.emit('error', new Error(`Invalid property ${propName} value: ${value}`))
      return false
    }
  }
}

function writeProperties (stream, properties, propertiesLength) {
  /* write properties to stream */
  writeVarByteInt(stream, propertiesLength)
  for (const propName in properties) {
    if (Object.prototype.hasOwnProperty.call(properties, propName) && properties[propName] !== null) {
      const value = properties[propName]
      if (Array.isArray(value)) {
        for (let valueIndex = 0; valueIndex < value.length; valueIndex++) {
          writeProperty(stream, propName, value[valueIndex])
        }
      } else {
        writeProperty(stream, propName, value)
      }
    }
  }
}

function byteLength (bufOrString) {
  if (!bufOrString) return 0
  else if (bufOrString instanceof Buffer) return bufOrString.length
  else return Buffer.byteLength(bufOrString)
}

function isStringOrBuffer (field) {
  return typeof field === 'string' || field instanceof Buffer
}

module.exports = generate

}).call(this)}).call(this,require("buffer").Buffer)
},{"./constants":38,"./numbers":41,"buffer":17,"debug":18,"process-nextick-args":49}],45:[function(require,module,exports){
/**
 * Helpers.
 */

var s = 1000;
var m = s * 60;
var h = m * 60;
var d = h * 24;
var w = d * 7;
var y = d * 365.25;

/**
 * Parse or format the given `val`.
 *
 * Options:
 *
 *  - `long` verbose formatting [false]
 *
 * @param {String|Number} val
 * @param {Object} [options]
 * @throws {Error} throw an error if val is not a non-empty string or a number
 * @return {String|Number}
 * @api public
 */

module.exports = function(val, options) {
  options = options || {};
  var type = typeof val;
  if (type === 'string' && val.length > 0) {
    return parse(val);
  } else if (type === 'number' && isFinite(val)) {
    return options.long ? fmtLong(val) : fmtShort(val);
  }
  throw new Error(
    'val is not a non-empty string or a valid number. val=' +
      JSON.stringify(val)
  );
};

/**
 * Parse the given `str` and return milliseconds.
 *
 * @param {String} str
 * @return {Number}
 * @api private
 */

function parse(str) {
  str = String(str);
  if (str.length > 100) {
    return;
  }
  var match = /^(-?(?:\d+)?\.?\d+) *(milliseconds?|msecs?|ms|seconds?|secs?|s|minutes?|mins?|m|hours?|hrs?|h|days?|d|weeks?|w|years?|yrs?|y)?$/i.exec(
    str
  );
  if (!match) {
    return;
  }
  var n = parseFloat(match[1]);
  var type = (match[2] || 'ms').toLowerCase();
  switch (type) {
    case 'years':
    case 'year':
    case 'yrs':
    case 'yr':
    case 'y':
      return n * y;
    case 'weeks':
    case 'week':
    case 'w':
      return n * w;
    case 'days':
    case 'day':
    case 'd':
      return n * d;
    case 'hours':
    case 'hour':
    case 'hrs':
    case 'hr':
    case 'h':
      return n * h;
    case 'minutes':
    case 'minute':
    case 'mins':
    case 'min':
    case 'm':
      return n * m;
    case 'seconds':
    case 'second':
    case 'secs':
    case 'sec':
    case 's':
      return n * s;
    case 'milliseconds':
    case 'millisecond':
    case 'msecs':
    case 'msec':
    case 'ms':
      return n;
    default:
      return undefined;
  }
}

/**
 * Short format for `ms`.
 *
 * @param {Number} ms
 * @return {String}
 * @api private
 */

function fmtShort(ms) {
  var msAbs = Math.abs(ms);
  if (msAbs >= d) {
    return Math.round(ms / d) + 'd';
  }
  if (msAbs >= h) {
    return Math.round(ms / h) + 'h';
  }
  if (msAbs >= m) {
    return Math.round(ms / m) + 'm';
  }
  if (msAbs >= s) {
    return Math.round(ms / s) + 's';
  }
  return ms + 'ms';
}

/**
 * Long format for `ms`.
 *
 * @param {Number} ms
 * @return {String}
 * @api private
 */

function fmtLong(ms) {
  var msAbs = Math.abs(ms);
  if (msAbs >= d) {
    return plural(ms, msAbs, d, 'day');
  }
  if (msAbs >= h) {
    return plural(ms, msAbs, h, 'hour');
  }
  if (msAbs >= m) {
    return plural(ms, msAbs, m, 'minute');
  }
  if (msAbs >= s) {
    return plural(ms, msAbs, s, 'second');
  }
  return ms + ' ms';
}

/**
 * Pluralization helper.
 */

function plural(ms, msAbs, n, name) {
  var isPlural = msAbs >= n * 1.5;
  return Math.round(ms / n) + ' ' + name + (isPlural ? 's' : '');
}

},{}],46:[function(require,module,exports){
// Copyright Takatoshi Kondo 2021
//
// Distributed under the MIT License

const NumberAllocator = require('./lib/number-allocator.js')

module.exports.NumberAllocator = NumberAllocator

},{"./lib/number-allocator.js":47}],47:[function(require,module,exports){
// Copyright Takatoshi Kondo 2021
//
// Distributed under the MIT License

'use strict'

const SortedSet = require('js-sdsl').Set
const debugTrace = require('debug')('number-allocator:trace')
const debugError = require('debug')('number-allocator:error')
/**
 * Interval constructor
 * @constructor
 * @param {Number} low  - The lowest value of the interval
 * @param {Number} high - The highest value of the interval
 */
function Interval (low, high) {
  this.low = low
  this.high = high
}

Interval.prototype.equals = function (other) {
  return this.low === other.low && this.high === other.high
}

Interval.prototype.compare = function (other) {
  if (this.low < other.low && this.high < other.low) return -1
  if (other.low < this.low && other.high < this.low) return 1
  return 0
}

/**
 * NumberAllocator constructor.
 * The all numbers are set to vacant status.
 * Time Complexity O(1)
 * @constructor
 * @param {Number} min  - The maximum number of allocatable. The number must be integer.
 * @param {Number} maxh - The minimum number of allocatable. The number must be integer.
 */
function NumberAllocator (min, max) {
  if (!(this instanceof NumberAllocator)) {
    return new NumberAllocator(min, max)
  }

  this.min = min
  this.max = max

  this.ss = new SortedSet(
    [],
    (lhs, rhs) => {
      return lhs.compare(rhs)
    }
  )
  debugTrace('Create')
  this.clear()
}

/**
 * Get the first vacant number. The status of the number is not updated.
 * Time Complexity O(1)
 * @return {Number} - The first vacant number. If all numbers are occupied, return null.
 *                    When alloc() is called then the same value will be allocated.
 */
NumberAllocator.prototype.firstVacant = function () {
  if (this.ss.size() === 0) return null
  return this.ss.front().low
}

/**
 * Allocate the first vacant number. The number become occupied status.
 * Time Complexity O(1)
 * @return {Number} - The first vacant number. If all numbers are occupied, return null.
 */
NumberAllocator.prototype.alloc = function () {
  if (this.ss.size() === 0) {
    debugTrace('alloc():empty')
    return null
  }
  const it = this.ss.front()
  const num = it.low
  if (num + 1 <= it.high) {
    // Overwrite the interval in the ss but it is safe,
    // because no order violation is happened.
    // x|----|
    ++it.low
  } else {
    this.ss.eraseElementByPos(0)
  }
  debugTrace('alloc():' + num)
  return num
}

/**
 * Use the number. The number become occupied status.
 * If the number has already been occupied, then return false.
 * Time Complexity O(logN) : N is the number of intervals (not numbers)
 * @param {Number} num - The number to request use.
 * @return {Boolean} - If `num` was not occupied, then return true, otherwise return false.
 */
NumberAllocator.prototype.use = function (num) {
  const key = new Interval(num, num)
  const it = this.ss.lowerBound(key)
  if (it) {
    if (it.equals(key)) {
      // |x|
      this.ss.eraseElementByValue(it)
      debugTrace('use():' + num)
      return true
    }

    // x |-----|
    if (it.low > num) return false

    // |x----|
    if (it.low === num) {
      // Overwrite the interval in the ss but it is safe,
      // because no order violation is happened.
      // x|----|
      ++it.low
      debugTrace('use():' + num)
      return true
    }

    // |----x|
    if (it.high === num) {
      // Overwrite the interval in the ss but it is safe,
      // because no order violation is happened.
      // |----|x
      --it.high
      debugTrace('use():' + num)
      return true
    }

    const low = it.low

    // |--x--|
    // Overwrite the interval in the ss but it is safe,
    // because no order violation is happened.
    // x|--|
    it.low = num + 1

    // |--|x|--|
    this.ss.insert(new Interval(low, num - 1))
    debugTrace('use():' + num)
    return true
  }

  debugTrace('use():failed')
  return false
}

/**
 * Deallocate the number. The number become vacant status.
 * Time Complexity O(logN) : N is the number of intervals (not numbers)
 * @param {Number} num - The number to deallocate. The number must be occupied status.
 *                       In other words, the number must be allocated by alloc() or occupied be use().
 */
NumberAllocator.prototype.free = function (num) {
  if (num < this.min || num > this.max) {
    debugError('free():' + num + ' is out of range')
    return
  }
  const key = new Interval(num, num)
  const it = this.ss.lowerBound(key)
  if (it) {
    if (it.low <= num && num <= it.high) {
      debugError('free():' + num + ' has already been vacant')
      return
    }
    if (it === this.ss.front()) {
      // v....
      if (num + 1 === it.low) {
        // Concat to right
        // Overwrite the interval in the ss but it is safe,
        // because no order violation is happened.
        --it.low
      } else {
        // Insert new interval
        this.ss.insert(key)
      }
    } else {
      // ..v..
      const itl = this.ss.reverseLowerBound(key)
      if (itl.high + 1 === num) {
        if (num + 1 === it.low) {
          // Concat to left and right
          this.ss.eraseElementByValue(itl)
          // Overwrite the interval in the ss but it is safe,
          // because no order violation is happened.
          it.low = itl.low
        } else {
          // Concat to left
          // Overwrite the interval in the ss but it is safe,
          // because no order violation is happened.
          itl.high = num
        }
      } else {
        if (num + 1 === it.low) {
          // Concat to right
          // Overwrite the interval in the ss but it is safe,
          // because no order violation is happened.
          it.low = num
        } else {
          // Insert new interval
          this.ss.insert(key)
        }
      }
    }
  } else {
    // ....v
    if (it === this.ss.front()) {
      // Insert new interval
      this.ss.insert(key)
      return
    }
    const itl = this.ss.reverseLowerBound(key)
    if (itl.high + 1 === num) {
      // Concat to left
      // Overwrite the interval in the ss but it is safe,
      // because no order violation is happened.
      itl.high = num
    } else {
      // Insert new interval
      this.ss.insert(key)
    }
  }
  debugTrace('free():' + num)
}

/**
 * Clear all occupied numbers.
 * The all numbers are set to vacant status.
 * Time Complexity O(1)
 */
NumberAllocator.prototype.clear = function () {
  debugTrace('clear()')
  this.ss.clear()
  this.ss.insert(new Interval(this.min, this.max))
}

/**
 * Get the number of intervals. Interval is internal structure of this library.
 * This function is for debugging.
 * Time Complexity O(1)
 * @return {Number} - The number of intervals.
 */
NumberAllocator.prototype.intervalCount = function () {
  return this.ss.size()
}

/**
 * Dump the internal structor of the library.
 * This function is for debugging.
 * Time Complexity O(N) : N is the number of intervals (not numbers)
 */
NumberAllocator.prototype.dump = function () {
  console.log('length:' + this.ss.size())
  for (const element of this.ss) {
    console.log(element)
  }
}

module.exports = NumberAllocator

},{"debug":18,"js-sdsl":36}],48:[function(require,module,exports){
var wrappy = require('wrappy')
module.exports = wrappy(once)
module.exports.strict = wrappy(onceStrict)

once.proto = once(function () {
  Object.defineProperty(Function.prototype, 'once', {
    value: function () {
      return once(this)
    },
    configurable: true
  })

  Object.defineProperty(Function.prototype, 'onceStrict', {
    value: function () {
      return onceStrict(this)
    },
    configurable: true
  })
})

function once (fn) {
  var f = function () {
    if (f.called) return f.value
    f.called = true
    return f.value = fn.apply(this, arguments)
  }
  f.called = false
  return f
}

function onceStrict (fn) {
  var f = function () {
    if (f.called)
      throw new Error(f.onceError)
    f.called = true
    return f.value = fn.apply(this, arguments)
  }
  var name = fn.name || 'Function wrapped with `once`'
  f.onceError = name + " shouldn't be called more than once"
  f.called = false
  return f
}

},{"wrappy":79}],49:[function(require,module,exports){
(function (process){(function (){
'use strict';

if (typeof process === 'undefined' ||
    !process.version ||
    process.version.indexOf('v0.') === 0 ||
    process.version.indexOf('v1.') === 0 && process.version.indexOf('v1.8.') !== 0) {
  module.exports = { nextTick: nextTick };
} else {
  module.exports = process
}

function nextTick(fn, arg1, arg2, arg3) {
  if (typeof fn !== 'function') {
    throw new TypeError('"callback" argument must be a function');
  }
  var len = arguments.length;
  var args, i;
  switch (len) {
  case 0:
  case 1:
    return process.nextTick(fn);
  case 2:
    return process.nextTick(function afterTickOne() {
      fn.call(null, arg1);
    });
  case 3:
    return process.nextTick(function afterTickTwo() {
      fn.call(null, arg1, arg2);
    });
  case 4:
    return process.nextTick(function afterTickThree() {
      fn.call(null, arg1, arg2, arg3);
    });
  default:
    args = new Array(len - 1);
    i = 0;
    while (i < args.length) {
      args[i++] = arguments[i];
    }
    return process.nextTick(function afterTick() {
      fn.apply(null, args);
    });
  }
}


}).call(this)}).call(this,require('_process'))
},{"_process":50}],50:[function(require,module,exports){
// shim for using process in browser
var process = module.exports = {};

// cached from whatever global is present so that test runners that stub it
// don't break things.  But we need to wrap it in a try catch in case it is
// wrapped in strict mode code which doesn't define any globals.  It's inside a
// function because try/catches deoptimize in certain engines.

var cachedSetTimeout;
var cachedClearTimeout;

function defaultSetTimout() {
    throw new Error('setTimeout has not been defined');
}
function defaultClearTimeout () {
    throw new Error('clearTimeout has not been defined');
}
(function () {
    try {
        if (typeof setTimeout === 'function') {
            cachedSetTimeout = setTimeout;
        } else {
            cachedSetTimeout = defaultSetTimout;
        }
    } catch (e) {
        cachedSetTimeout = defaultSetTimout;
    }
    try {
        if (typeof clearTimeout === 'function') {
            cachedClearTimeout = clearTimeout;
        } else {
            cachedClearTimeout = defaultClearTimeout;
        }
    } catch (e) {
        cachedClearTimeout = defaultClearTimeout;
    }
} ())
function runTimeout(fun) {
    if (cachedSetTimeout === setTimeout) {
        //normal enviroments in sane situations
        return setTimeout(fun, 0);
    }
    // if setTimeout wasn't available but was latter defined
    if ((cachedSetTimeout === defaultSetTimout || !cachedSetTimeout) && setTimeout) {
        cachedSetTimeout = setTimeout;
        return setTimeout(fun, 0);
    }
    try {
        // when when somebody has screwed with setTimeout but no I.E. maddness
        return cachedSetTimeout(fun, 0);
    } catch(e){
        try {
            // When we are in I.E. but the script has been evaled so I.E. doesn't trust the global object when called normally
            return cachedSetTimeout.call(null, fun, 0);
        } catch(e){
            // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error
            return cachedSetTimeout.call(this, fun, 0);
        }
    }


}
function runClearTimeout(marker) {
    if (cachedClearTimeout === clearTimeout) {
        //normal enviroments in sane situations
        return clearTimeout(marker);
    }
    // if clearTimeout wasn't available but was latter defined
    if ((cachedClearTimeout === defaultClearTimeout || !cachedClearTimeout) && clearTimeout) {
        cachedClearTimeout = clearTimeout;
        return clearTimeout(marker);
    }
    try {
        // when when somebody has screwed with setTimeout but no I.E. maddness
        return cachedClearTimeout(marker);
    } catch (e){
        try {
            // When we are in I.E. but the script has been evaled so I.E. doesn't  trust the global object when called normally
            return cachedClearTimeout.call(null, marker);
        } catch (e){
            // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error.
            // Some versions of I.E. have different rules for clearTimeout vs setTimeout
            return cachedClearTimeout.call(this, marker);
        }
    }



}
var queue = [];
var draining = false;
var currentQueue;
var queueIndex = -1;

function cleanUpNextTick() {
    if (!draining || !currentQueue) {
        return;
    }
    draining = false;
    if (currentQueue.length) {
        queue = currentQueue.concat(queue);
    } else {
        queueIndex = -1;
    }
    if (queue.length) {
        drainQueue();
    }
}

function drainQueue() {
    if (draining) {
        return;
    }
    var timeout = runTimeout(cleanUpNextTick);
    draining = true;

    var len = queue.length;
    while(len) {
        currentQueue = queue;
        queue = [];
        while (++queueIndex < len) {
            if (currentQueue) {
                currentQueue[queueIndex].run();
            }
        }
        queueIndex = -1;
        len = queue.length;
    }
    currentQueue = null;
    draining = false;
    runClearTimeout(timeout);
}

process.nextTick = function (fun) {
    var args = new Array(arguments.length - 1);
    if (arguments.length > 1) {
        for (var i = 1; i < arguments.length; i++) {
            args[i - 1] = arguments[i];
        }
    }
    queue.push(new Item(fun, args));
    if (queue.length === 1 && !draining) {
        runTimeout(drainQueue);
    }
};

// v8 likes predictible objects
function Item(fun, array) {
    this.fun = fun;
    this.array = array;
}
Item.prototype.run = function () {
    this.fun.apply(null, this.array);
};
process.title = 'browser';
process.browser = true;
process.env = {};
process.argv = [];
process.version = ''; // empty string to avoid regexp issues
process.versions = {};

function noop() {}

process.on = noop;
process.addListener = noop;
process.once = noop;
process.off = noop;
process.removeListener = noop;
process.removeAllListeners = noop;
process.emit = noop;
process.prependListener = noop;
process.prependOnceListener = noop;

process.listeners = function (name) { return [] }

process.binding = function (name) {
    throw new Error('process.binding is not supported');
};

process.cwd = function () { return '/' };
process.chdir = function (dir) {
    throw new Error('process.chdir is not supported');
};
process.umask = function() { return 0; };

},{}],51:[function(require,module,exports){
(function (global){(function (){
/*! https://mths.be/punycode v1.4.1 by @mathias */
;(function(root) {

	/** Detect free variables */
	var freeExports = typeof exports == 'object' && exports &&
		!exports.nodeType && exports;
	var freeModule = typeof module == 'object' && module &&
		!module.nodeType && module;
	var freeGlobal = typeof global == 'object' && global;
	if (
		freeGlobal.global === freeGlobal ||
		freeGlobal.window === freeGlobal ||
		freeGlobal.self === freeGlobal
	) {
		root = freeGlobal;
	}

	/**
	 * The `punycode` object.
	 * @name punycode
	 * @type Object
	 */
	var punycode,

	/** Highest positive signed 32-bit float value */
	maxInt = 2147483647, // aka. 0x7FFFFFFF or 2^31-1

	/** Bootstring parameters */
	base = 36,
	tMin = 1,
	tMax = 26,
	skew = 38,
	damp = 700,
	initialBias = 72,
	initialN = 128, // 0x80
	delimiter = '-', // '\x2D'

	/** Regular expressions */
	regexPunycode = /^xn--/,
	regexNonASCII = /[^\x20-\x7E]/, // unprintable ASCII chars + non-ASCII chars
	regexSeparators = /[\x2E\u3002\uFF0E\uFF61]/g, // RFC 3490 separators

	/** Error messages */
	errors = {
		'overflow': 'Overflow: input needs wider integers to process',
		'not-basic': 'Illegal input >= 0x80 (not a basic code point)',
		'invalid-input': 'Invalid input'
	},

	/** Convenience shortcuts */
	baseMinusTMin = base - tMin,
	floor = Math.floor,
	stringFromCharCode = String.fromCharCode,

	/** Temporary variable */
	key;

	/*--------------------------------------------------------------------------*/

	/**
	 * A generic error utility function.
	 * @private
	 * @param {String} type The error type.
	 * @returns {Error} Throws a `RangeError` with the applicable error message.
	 */
	function error(type) {
		throw new RangeError(errors[type]);
	}

	/**
	 * A generic `Array#map` utility function.
	 * @private
	 * @param {Array} array The array to iterate over.
	 * @param {Function} callback The function that gets called for every array
	 * item.
	 * @returns {Array} A new array of values returned by the callback function.
	 */
	function map(array, fn) {
		var length = array.length;
		var result = [];
		while (length--) {
			result[length] = fn(array[length]);
		}
		return result;
	}

	/**
	 * A simple `Array#map`-like wrapper to work with domain name strings or email
	 * addresses.
	 * @private
	 * @param {String} domain The domain name or email address.
	 * @param {Function} callback The function that gets called for every
	 * character.
	 * @returns {Array} A new string of characters returned by the callback
	 * function.
	 */
	function mapDomain(string, fn) {
		var parts = string.split('@');
		var result = '';
		if (parts.length > 1) {
			// In email addresses, only the domain name should be punycoded. Leave
			// the local part (i.e. everything up to `@`) intact.
			result = parts[0] + '@';
			string = parts[1];
		}
		// Avoid `split(regex)` for IE8 compatibility. See #17.
		string = string.replace(regexSeparators, '\x2E');
		var labels = string.split('.');
		var encoded = map(labels, fn).join('.');
		return result + encoded;
	}

	/**
	 * Creates an array containing the numeric code points of each Unicode
	 * character in the string. While JavaScript uses UCS-2 internally,
	 * this function will convert a pair of surrogate halves (each of which
	 * UCS-2 exposes as separate characters) into a single code point,
	 * matching UTF-16.
	 * @see `punycode.ucs2.encode`
	 * @see <https://mathiasbynens.be/notes/javascript-encoding>
	 * @memberOf punycode.ucs2
	 * @name decode
	 * @param {String} string The Unicode input string (UCS-2).
	 * @returns {Array} The new array of code points.
	 */
	function ucs2decode(string) {
		var output = [],
		    counter = 0,
		    length = string.length,
		    value,
		    extra;
		while (counter < length) {
			value = string.charCodeAt(counter++);
			if (value >= 0xD800 && value <= 0xDBFF && counter < length) {
				// high surrogate, and there is a next character
				extra = string.charCodeAt(counter++);
				if ((extra & 0xFC00) == 0xDC00) { // low surrogate
					output.push(((value & 0x3FF) << 10) + (extra & 0x3FF) + 0x10000);
				} else {
					// unmatched surrogate; only append this code unit, in case the next
					// code unit is the high surrogate of a surrogate pair
					output.push(value);
					counter--;
				}
			} else {
				output.push(value);
			}
		}
		return output;
	}

	/**
	 * Creates a string based on an array of numeric code points.
	 * @see `punycode.ucs2.decode`
	 * @memberOf punycode.ucs2
	 * @name encode
	 * @param {Array} codePoints The array of numeric code points.
	 * @returns {String} The new Unicode string (UCS-2).
	 */
	function ucs2encode(array) {
		return map(array, function(value) {
			var output = '';
			if (value > 0xFFFF) {
				value -= 0x10000;
				output += stringFromCharCode(value >>> 10 & 0x3FF | 0xD800);
				value = 0xDC00 | value & 0x3FF;
			}
			output += stringFromCharCode(value);
			return output;
		}).join('');
	}

	/**
	 * Converts a basic code point into a digit/integer.
	 * @see `digitToBasic()`
	 * @private
	 * @param {Number} codePoint The basic numeric code point value.
	 * @returns {Number} The numeric value of a basic code point (for use in
	 * representing integers) in the range `0` to `base - 1`, or `base` if
	 * the code point does not represent a value.
	 */
	function basicToDigit(codePoint) {
		if (codePoint - 48 < 10) {
			return codePoint - 22;
		}
		if (codePoint - 65 < 26) {
			return codePoint - 65;
		}
		if (codePoint - 97 < 26) {
			return codePoint - 97;
		}
		return base;
	}

	/**
	 * Converts a digit/integer into a basic code point.
	 * @see `basicToDigit()`
	 * @private
	 * @param {Number} digit The numeric value of a basic code point.
	 * @returns {Number} The basic code point whose value (when used for
	 * representing integers) is `digit`, which needs to be in the range
	 * `0` to `base - 1`. If `flag` is non-zero, the uppercase form is
	 * used; else, the lowercase form is used. The behavior is undefined
	 * if `flag` is non-zero and `digit` has no uppercase form.
	 */
	function digitToBasic(digit, flag) {
		//  0..25 map to ASCII a..z or A..Z
		// 26..35 map to ASCII 0..9
		return digit + 22 + 75 * (digit < 26) - ((flag != 0) << 5);
	}

	/**
	 * Bias adaptation function as per section 3.4 of RFC 3492.
	 * https://tools.ietf.org/html/rfc3492#section-3.4
	 * @private
	 */
	function adapt(delta, numPoints, firstTime) {
		var k = 0;
		delta = firstTime ? floor(delta / damp) : delta >> 1;
		delta += floor(delta / numPoints);
		for (/* no initialization */; delta > baseMinusTMin * tMax >> 1; k += base) {
			delta = floor(delta / baseMinusTMin);
		}
		return floor(k + (baseMinusTMin + 1) * delta / (delta + skew));
	}

	/**
	 * Converts a Punycode string of ASCII-only symbols to a string of Unicode
	 * symbols.
	 * @memberOf punycode
	 * @param {String} input The Punycode string of ASCII-only symbols.
	 * @returns {String} The resulting string of Unicode symbols.
	 */
	function decode(input) {
		// Don't use UCS-2
		var output = [],
		    inputLength = input.length,
		    out,
		    i = 0,
		    n = initialN,
		    bias = initialBias,
		    basic,
		    j,
		    index,
		    oldi,
		    w,
		    k,
		    digit,
		    t,
		    /** Cached calculation results */
		    baseMinusT;

		// Handle the basic code points: let `basic` be the number of input code
		// points before the last delimiter, or `0` if there is none, then copy
		// the first basic code points to the output.

		basic = input.lastIndexOf(delimiter);
		if (basic < 0) {
			basic = 0;
		}

		for (j = 0; j < basic; ++j) {
			// if it's not a basic code point
			if (input.charCodeAt(j) >= 0x80) {
				error('not-basic');
			}
			output.push(input.charCodeAt(j));
		}

		// Main decoding loop: start just after the last delimiter if any basic code
		// points were copied; start at the beginning otherwise.

		for (index = basic > 0 ? basic + 1 : 0; index < inputLength; /* no final expression */) {

			// `index` is the index of the next character to be consumed.
			// Decode a generalized variable-length integer into `delta`,
			// which gets added to `i`. The overflow checking is easier
			// if we increase `i` as we go, then subtract off its starting
			// value at the end to obtain `delta`.
			for (oldi = i, w = 1, k = base; /* no condition */; k += base) {

				if (index >= inputLength) {
					error('invalid-input');
				}

				digit = basicToDigit(input.charCodeAt(index++));

				if (digit >= base || digit > floor((maxInt - i) / w)) {
					error('overflow');
				}

				i += digit * w;
				t = k <= bias ? tMin : (k >= bias + tMax ? tMax : k - bias);

				if (digit < t) {
					break;
				}

				baseMinusT = base - t;
				if (w > floor(maxInt / baseMinusT)) {
					error('overflow');
				}

				w *= baseMinusT;

			}

			out = output.length + 1;
			bias = adapt(i - oldi, out, oldi == 0);

			// `i` was supposed to wrap around from `out` to `0`,
			// incrementing `n` each time, so we'll fix that now:
			if (floor(i / out) > maxInt - n) {
				error('overflow');
			}

			n += floor(i / out);
			i %= out;

			// Insert `n` at position `i` of the output
			output.splice(i++, 0, n);

		}

		return ucs2encode(output);
	}

	/**
	 * Converts a string of Unicode symbols (e.g. a domain name label) to a
	 * Punycode string of ASCII-only symbols.
	 * @memberOf punycode
	 * @param {String} input The string of Unicode symbols.
	 * @returns {String} The resulting Punycode string of ASCII-only symbols.
	 */
	function encode(input) {
		var n,
		    delta,
		    handledCPCount,
		    basicLength,
		    bias,
		    j,
		    m,
		    q,
		    k,
		    t,
		    currentValue,
		    output = [],
		    /** `inputLength` will hold the number of code points in `input`. */
		    inputLength,
		    /** Cached calculation results */
		    handledCPCountPlusOne,
		    baseMinusT,
		    qMinusT;

		// Convert the input in UCS-2 to Unicode
		input = ucs2decode(input);

		// Cache the length
		inputLength = input.length;

		// Initialize the state
		n = initialN;
		delta = 0;
		bias = initialBias;

		// Handle the basic code points
		for (j = 0; j < inputLength; ++j) {
			currentValue = input[j];
			if (currentValue < 0x80) {
				output.push(stringFromCharCode(currentValue));
			}
		}

		handledCPCount = basicLength = output.length;

		// `handledCPCount` is the number of code points that have been handled;
		// `basicLength` is the number of basic code points.

		// Finish the basic string - if it is not empty - with a delimiter
		if (basicLength) {
			output.push(delimiter);
		}

		// Main encoding loop:
		while (handledCPCount < inputLength) {

			// All non-basic code points < n have been handled already. Find the next
			// larger one:
			for (m = maxInt, j = 0; j < inputLength; ++j) {
				currentValue = input[j];
				if (currentValue >= n && currentValue < m) {
					m = currentValue;
				}
			}

			// Increase `delta` enough to advance the decoder's <n,i> state to <m,0>,
			// but guard against overflow
			handledCPCountPlusOne = handledCPCount + 1;
			if (m - n > floor((maxInt - delta) / handledCPCountPlusOne)) {
				error('overflow');
			}

			delta += (m - n) * handledCPCountPlusOne;
			n = m;

			for (j = 0; j < inputLength; ++j) {
				currentValue = input[j];

				if (currentValue < n && ++delta > maxInt) {
					error('overflow');
				}

				if (currentValue == n) {
					// Represent delta as a generalized variable-length integer
					for (q = delta, k = base; /* no condition */; k += base) {
						t = k <= bias ? tMin : (k >= bias + tMax ? tMax : k - bias);
						if (q < t) {
							break;
						}
						qMinusT = q - t;
						baseMinusT = base - t;
						output.push(
							stringFromCharCode(digitToBasic(t + qMinusT % baseMinusT, 0))
						);
						q = floor(qMinusT / baseMinusT);
					}

					output.push(stringFromCharCode(digitToBasic(q, 0)));
					bias = adapt(delta, handledCPCountPlusOne, handledCPCount == basicLength);
					delta = 0;
					++handledCPCount;
				}
			}

			++delta;
			++n;

		}
		return output.join('');
	}

	/**
	 * Converts a Punycode string representing a domain name or an email address
	 * to Unicode. Only the Punycoded parts of the input will be converted, i.e.
	 * it doesn't matter if you call it on a string that has already been
	 * converted to Unicode.
	 * @memberOf punycode
	 * @param {String} input The Punycoded domain name or email address to
	 * convert to Unicode.
	 * @returns {String} The Unicode representation of the given Punycode
	 * string.
	 */
	function toUnicode(input) {
		return mapDomain(input, function(string) {
			return regexPunycode.test(string)
				? decode(string.slice(4).toLowerCase())
				: string;
		});
	}

	/**
	 * Converts a Unicode string representing a domain name or an email address to
	 * Punycode. Only the non-ASCII parts of the domain name will be converted,
	 * i.e. it doesn't matter if you call it with a domain that's already in
	 * ASCII.
	 * @memberOf punycode
	 * @param {String} input The domain name or email address to convert, as a
	 * Unicode string.
	 * @returns {String} The Punycode representation of the given domain name or
	 * email address.
	 */
	function toASCII(input) {
		return mapDomain(input, function(string) {
			return regexNonASCII.test(string)
				? 'xn--' + encode(string)
				: string;
		});
	}

	/*--------------------------------------------------------------------------*/

	/** Define the public API */
	punycode = {
		/**
		 * A string representing the current Punycode.js version number.
		 * @memberOf punycode
		 * @type String
		 */
		'version': '1.4.1',
		/**
		 * An object of methods to convert from JavaScript's internal character
		 * representation (UCS-2) to Unicode code points, and back.
		 * @see <https://mathiasbynens.be/notes/javascript-encoding>
		 * @memberOf punycode
		 * @type Object
		 */
		'ucs2': {
			'decode': ucs2decode,
			'encode': ucs2encode
		},
		'decode': decode,
		'encode': encode,
		'toASCII': toASCII,
		'toUnicode': toUnicode
	};

	/** Expose `punycode` */
	// Some AMD build optimizers, like r.js, check for specific condition patterns
	// like the following:
	if (
		typeof define == 'function' &&
		typeof define.amd == 'object' &&
		define.amd
	) {
		define('punycode', function() {
			return punycode;
		});
	} else if (freeExports && freeModule) {
		if (module.exports == freeExports) {
			// in Node.js, io.js, or RingoJS v0.8.0+
			freeModule.exports = punycode;
		} else {
			// in Narwhal or RingoJS v0.7.0-
			for (key in punycode) {
				punycode.hasOwnProperty(key) && (freeExports[key] = punycode[key]);
			}
		}
	} else {
		// in Rhino or a web browser
		root.punycode = punycode;
	}

}(this));

}).call(this)}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{}],52:[function(require,module,exports){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

'use strict';

// If obj.hasOwnProperty has been overridden, then calling
// obj.hasOwnProperty(prop) will break.
// See: https://github.com/joyent/node/issues/1707
function hasOwnProperty(obj, prop) {
  return Object.prototype.hasOwnProperty.call(obj, prop);
}

module.exports = function(qs, sep, eq, options) {
  sep = sep || '&';
  eq = eq || '=';
  var obj = {};

  if (typeof qs !== 'string' || qs.length === 0) {
    return obj;
  }

  var regexp = /\+/g;
  qs = qs.split(sep);

  var maxKeys = 1000;
  if (options && typeof options.maxKeys === 'number') {
    maxKeys = options.maxKeys;
  }

  var len = qs.length;
  // maxKeys <= 0 means that we should not limit keys count
  if (maxKeys > 0 && len > maxKeys) {
    len = maxKeys;
  }

  for (var i = 0; i < len; ++i) {
    var x = qs[i].replace(regexp, '%20'),
        idx = x.indexOf(eq),
        kstr, vstr, k, v;

    if (idx >= 0) {
      kstr = x.substr(0, idx);
      vstr = x.substr(idx + 1);
    } else {
      kstr = x;
      vstr = '';
    }

    k = decodeURIComponent(kstr);
    v = decodeURIComponent(vstr);

    if (!hasOwnProperty(obj, k)) {
      obj[k] = v;
    } else if (isArray(obj[k])) {
      obj[k].push(v);
    } else {
      obj[k] = [obj[k], v];
    }
  }

  return obj;
};

var isArray = Array.isArray || function (xs) {
  return Object.prototype.toString.call(xs) === '[object Array]';
};

},{}],53:[function(require,module,exports){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

'use strict';

var stringifyPrimitive = function(v) {
  switch (typeof v) {
    case 'string':
      return v;

    case 'boolean':
      return v ? 'true' : 'false';

    case 'number':
      return isFinite(v) ? v : '';

    default:
      return '';
  }
};

module.exports = function(obj, sep, eq, name) {
  sep = sep || '&';
  eq = eq || '=';
  if (obj === null) {
    obj = undefined;
  }

  if (typeof obj === 'object') {
    return map(objectKeys(obj), function(k) {
      var ks = encodeURIComponent(stringifyPrimitive(k)) + eq;
      if (isArray(obj[k])) {
        return map(obj[k], function(v) {
          return ks + encodeURIComponent(stringifyPrimitive(v));
        }).join(sep);
      } else {
        return ks + encodeURIComponent(stringifyPrimitive(obj[k]));
      }
    }).join(sep);

  }

  if (!name) return '';
  return encodeURIComponent(stringifyPrimitive(name)) + eq +
         encodeURIComponent(stringifyPrimitive(obj));
};

var isArray = Array.isArray || function (xs) {
  return Object.prototype.toString.call(xs) === '[object Array]';
};

function map (xs, f) {
  if (xs.map) return xs.map(f);
  var res = [];
  for (var i = 0; i < xs.length; i++) {
    res.push(f(xs[i], i));
  }
  return res;
}

var objectKeys = Object.keys || function (obj) {
  var res = [];
  for (var key in obj) {
    if (Object.prototype.hasOwnProperty.call(obj, key)) res.push(key);
  }
  return res;
};

},{}],54:[function(require,module,exports){
'use strict';

exports.decode = exports.parse = require('./decode');
exports.encode = exports.stringify = require('./encode');

},{"./decode":52,"./encode":53}],55:[function(require,module,exports){
'use strict';

function _inheritsLoose(subClass, superClass) { subClass.prototype = Object.create(superClass.prototype); subClass.prototype.constructor = subClass; subClass.__proto__ = superClass; }

var codes = {};

function createErrorType(code, message, Base) {
  if (!Base) {
    Base = Error;
  }

  function getMessage(arg1, arg2, arg3) {
    if (typeof message === 'string') {
      return message;
    } else {
      return message(arg1, arg2, arg3);
    }
  }

  var NodeError =
  /*#__PURE__*/
  function (_Base) {
    _inheritsLoose(NodeError, _Base);

    function NodeError(arg1, arg2, arg3) {
      return _Base.call(this, getMessage(arg1, arg2, arg3)) || this;
    }

    return NodeError;
  }(Base);

  NodeError.prototype.name = Base.name;
  NodeError.prototype.code = code;
  codes[code] = NodeError;
} // https://github.com/nodejs/node/blob/v10.8.0/lib/internal/errors.js


function oneOf(expected, thing) {
  if (Array.isArray(expected)) {
    var len = expected.length;
    expected = expected.map(function (i) {
      return String(i);
    });

    if (len > 2) {
      return "one of ".concat(thing, " ").concat(expected.slice(0, len - 1).join(', '), ", or ") + expected[len - 1];
    } else if (len === 2) {
      return "one of ".concat(thing, " ").concat(expected[0], " or ").concat(expected[1]);
    } else {
      return "of ".concat(thing, " ").concat(expected[0]);
    }
  } else {
    return "of ".concat(thing, " ").concat(String(expected));
  }
} // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/startsWith


function startsWith(str, search, pos) {
  return str.substr(!pos || pos < 0 ? 0 : +pos, search.length) === search;
} // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/endsWith


function endsWith(str, search, this_len) {
  if (this_len === undefined || this_len > str.length) {
    this_len = str.length;
  }

  return str.substring(this_len - search.length, this_len) === search;
} // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/includes


function includes(str, search, start) {
  if (typeof start !== 'number') {
    start = 0;
  }

  if (start + search.length > str.length) {
    return false;
  } else {
    return str.indexOf(search, start) !== -1;
  }
}

createErrorType('ERR_INVALID_OPT_VALUE', function (name, value) {
  return 'The value "' + value + '" is invalid for option "' + name + '"';
}, TypeError);
createErrorType('ERR_INVALID_ARG_TYPE', function (name, expected, actual) {
  // determiner: 'must be' or 'must not be'
  var determiner;

  if (typeof expected === 'string' && startsWith(expected, 'not ')) {
    determiner = 'must not be';
    expected = expected.replace(/^not /, '');
  } else {
    determiner = 'must be';
  }

  var msg;

  if (endsWith(name, ' argument')) {
    // For cases like 'first argument'
    msg = "The ".concat(name, " ").concat(determiner, " ").concat(oneOf(expected, 'type'));
  } else {
    var type = includes(name, '.') ? 'property' : 'argument';
    msg = "The \"".concat(name, "\" ").concat(type, " ").concat(determiner, " ").concat(oneOf(expected, 'type'));
  }

  msg += ". Received type ".concat(typeof actual);
  return msg;
}, TypeError);
createErrorType('ERR_STREAM_PUSH_AFTER_EOF', 'stream.push() after EOF');
createErrorType('ERR_METHOD_NOT_IMPLEMENTED', function (name) {
  return 'The ' + name + ' method is not implemented';
});
createErrorType('ERR_STREAM_PREMATURE_CLOSE', 'Premature close');
createErrorType('ERR_STREAM_DESTROYED', function (name) {
  return 'Cannot call ' + name + ' after a stream was destroyed';
});
createErrorType('ERR_MULTIPLE_CALLBACK', 'Callback called multiple times');
createErrorType('ERR_STREAM_CANNOT_PIPE', 'Cannot pipe, not readable');
createErrorType('ERR_STREAM_WRITE_AFTER_END', 'write after end');
createErrorType('ERR_STREAM_NULL_VALUES', 'May not write null values to stream', TypeError);
createErrorType('ERR_UNKNOWN_ENCODING', function (arg) {
  return 'Unknown encoding: ' + arg;
}, TypeError);
createErrorType('ERR_STREAM_UNSHIFT_AFTER_END_EVENT', 'stream.unshift() after end event');
module.exports.codes = codes;

},{}],56:[function(require,module,exports){
(function (process){(function (){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
// a duplex stream is just a stream that is both readable and writable.
// Since JS doesn't have multiple prototypal inheritance, this class
// prototypally inherits from Readable, and then parasitically from
// Writable.
'use strict';
/*<replacement>*/

var objectKeys = Object.keys || function (obj) {
  var keys = [];

  for (var key in obj) {
    keys.push(key);
  }

  return keys;
};
/*</replacement>*/


module.exports = Duplex;

var Readable = require('./_stream_readable');

var Writable = require('./_stream_writable');

require('inherits')(Duplex, Readable);

{
  // Allow the keys array to be GC'ed.
  var keys = objectKeys(Writable.prototype);

  for (var v = 0; v < keys.length; v++) {
    var method = keys[v];
    if (!Duplex.prototype[method]) Duplex.prototype[method] = Writable.prototype[method];
  }
}

function Duplex(options) {
  if (!(this instanceof Duplex)) return new Duplex(options);
  Readable.call(this, options);
  Writable.call(this, options);
  this.allowHalfOpen = true;

  if (options) {
    if (options.readable === false) this.readable = false;
    if (options.writable === false) this.writable = false;

    if (options.allowHalfOpen === false) {
      this.allowHalfOpen = false;
      this.once('end', onend);
    }
  }
}

Object.defineProperty(Duplex.prototype, 'writableHighWaterMark', {
  // making it explicit this property is not enumerable
  // because otherwise some prototype manipulation in
  // userland will fail
  enumerable: false,
  get: function get() {
    return this._writableState.highWaterMark;
  }
});
Object.defineProperty(Duplex.prototype, 'writableBuffer', {
  // making it explicit this property is not enumerable
  // because otherwise some prototype manipulation in
  // userland will fail
  enumerable: false,
  get: function get() {
    return this._writableState && this._writableState.getBuffer();
  }
});
Object.defineProperty(Duplex.prototype, 'writableLength', {
  // making it explicit this property is not enumerable
  // because otherwise some prototype manipulation in
  // userland will fail
  enumerable: false,
  get: function get() {
    return this._writableState.length;
  }
}); // the no-half-open enforcer

function onend() {
  // If the writable side ended, then we're ok.
  if (this._writableState.ended) return; // no more data can be written.
  // But allow more writes to happen in this tick.

  process.nextTick(onEndNT, this);
}

function onEndNT(self) {
  self.end();
}

Object.defineProperty(Duplex.prototype, 'destroyed', {
  // making it explicit this property is not enumerable
  // because otherwise some prototype manipulation in
  // userland will fail
  enumerable: false,
  get: function get() {
    if (this._readableState === undefined || this._writableState === undefined) {
      return false;
    }

    return this._readableState.destroyed && this._writableState.destroyed;
  },
  set: function set(value) {
    // we ignore the value if the stream
    // has not been initialized yet
    if (this._readableState === undefined || this._writableState === undefined) {
      return;
    } // backward compatibility, the user is explicitly
    // managing destroyed


    this._readableState.destroyed = value;
    this._writableState.destroyed = value;
  }
});
}).call(this)}).call(this,require('_process'))
},{"./_stream_readable":58,"./_stream_writable":60,"_process":50,"inherits":24}],57:[function(require,module,exports){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
// a passthrough stream.
// basically just the most minimal sort of Transform stream.
// Every written chunk gets output as-is.
'use strict';

module.exports = PassThrough;

var Transform = require('./_stream_transform');

require('inherits')(PassThrough, Transform);

function PassThrough(options) {
  if (!(this instanceof PassThrough)) return new PassThrough(options);
  Transform.call(this, options);
}

PassThrough.prototype._transform = function (chunk, encoding, cb) {
  cb(null, chunk);
};
},{"./_stream_transform":59,"inherits":24}],58:[function(require,module,exports){
(function (process,global){(function (){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
'use strict';

module.exports = Readable;
/*<replacement>*/

var Duplex;
/*</replacement>*/

Readable.ReadableState = ReadableState;
/*<replacement>*/

var EE = require('events').EventEmitter;

var EElistenerCount = function EElistenerCount(emitter, type) {
  return emitter.listeners(type).length;
};
/*</replacement>*/

/*<replacement>*/


var Stream = require('./internal/streams/stream');
/*</replacement>*/


var Buffer = require('buffer').Buffer;

var OurUint8Array = global.Uint8Array || function () {};

function _uint8ArrayToBuffer(chunk) {
  return Buffer.from(chunk);
}

function _isUint8Array(obj) {
  return Buffer.isBuffer(obj) || obj instanceof OurUint8Array;
}
/*<replacement>*/


var debugUtil = require('util');

var debug;

if (debugUtil && debugUtil.debuglog) {
  debug = debugUtil.debuglog('stream');
} else {
  debug = function debug() {};
}
/*</replacement>*/


var BufferList = require('./internal/streams/buffer_list');

var destroyImpl = require('./internal/streams/destroy');

var _require = require('./internal/streams/state'),
    getHighWaterMark = _require.getHighWaterMark;

var _require$codes = require('../errors').codes,
    ERR_INVALID_ARG_TYPE = _require$codes.ERR_INVALID_ARG_TYPE,
    ERR_STREAM_PUSH_AFTER_EOF = _require$codes.ERR_STREAM_PUSH_AFTER_EOF,
    ERR_METHOD_NOT_IMPLEMENTED = _require$codes.ERR_METHOD_NOT_IMPLEMENTED,
    ERR_STREAM_UNSHIFT_AFTER_END_EVENT = _require$codes.ERR_STREAM_UNSHIFT_AFTER_END_EVENT; // Lazy loaded to improve the startup performance.


var StringDecoder;
var createReadableStreamAsyncIterator;
var from;

require('inherits')(Readable, Stream);

var errorOrDestroy = destroyImpl.errorOrDestroy;
var kProxyEvents = ['error', 'close', 'destroy', 'pause', 'resume'];

function prependListener(emitter, event, fn) {
  // Sadly this is not cacheable as some libraries bundle their own
  // event emitter implementation with them.
  if (typeof emitter.prependListener === 'function') return emitter.prependListener(event, fn); // This is a hack to make sure that our error handler is attached before any
  // userland ones.  NEVER DO THIS. This is here only because this code needs
  // to continue to work with older versions of Node.js that do not include
  // the prependListener() method. The goal is to eventually remove this hack.

  if (!emitter._events || !emitter._events[event]) emitter.on(event, fn);else if (Array.isArray(emitter._events[event])) emitter._events[event].unshift(fn);else emitter._events[event] = [fn, emitter._events[event]];
}

function ReadableState(options, stream, isDuplex) {
  Duplex = Duplex || require('./_stream_duplex');
  options = options || {}; // Duplex streams are both readable and writable, but share
  // the same options object.
  // However, some cases require setting options to different
  // values for the readable and the writable sides of the duplex stream.
  // These options can be provided separately as readableXXX and writableXXX.

  if (typeof isDuplex !== 'boolean') isDuplex = stream instanceof Duplex; // object stream flag. Used to make read(n) ignore n and to
  // make all the buffer merging and length checks go away

  this.objectMode = !!options.objectMode;
  if (isDuplex) this.objectMode = this.objectMode || !!options.readableObjectMode; // the point at which it stops calling _read() to fill the buffer
  // Note: 0 is a valid value, means "don't call _read preemptively ever"

  this.highWaterMark = getHighWaterMark(this, options, 'readableHighWaterMark', isDuplex); // A linked list is used to store data chunks instead of an array because the
  // linked list can remove elements from the beginning faster than
  // array.shift()

  this.buffer = new BufferList();
  this.length = 0;
  this.pipes = null;
  this.pipesCount = 0;
  this.flowing = null;
  this.ended = false;
  this.endEmitted = false;
  this.reading = false; // a flag to be able to tell if the event 'readable'/'data' is emitted
  // immediately, or on a later tick.  We set this to true at first, because
  // any actions that shouldn't happen until "later" should generally also
  // not happen before the first read call.

  this.sync = true; // whenever we return null, then we set a flag to say
  // that we're awaiting a 'readable' event emission.

  this.needReadable = false;
  this.emittedReadable = false;
  this.readableListening = false;
  this.resumeScheduled = false;
  this.paused = true; // Should close be emitted on destroy. Defaults to true.

  this.emitClose = options.emitClose !== false; // Should .destroy() be called after 'end' (and potentially 'finish')

  this.autoDestroy = !!options.autoDestroy; // has it been destroyed

  this.destroyed = false; // Crypto is kind of old and crusty.  Historically, its default string
  // encoding is 'binary' so we have to make this configurable.
  // Everything else in the universe uses 'utf8', though.

  this.defaultEncoding = options.defaultEncoding || 'utf8'; // the number of writers that are awaiting a drain event in .pipe()s

  this.awaitDrain = 0; // if true, a maybeReadMore has been scheduled

  this.readingMore = false;
  this.decoder = null;
  this.encoding = null;

  if (options.encoding) {
    if (!StringDecoder) StringDecoder = require('string_decoder/').StringDecoder;
    this.decoder = new StringDecoder(options.encoding);
    this.encoding = options.encoding;
  }
}

function Readable(options) {
  Duplex = Duplex || require('./_stream_duplex');
  if (!(this instanceof Readable)) return new Readable(options); // Checking for a Stream.Duplex instance is faster here instead of inside
  // the ReadableState constructor, at least with V8 6.5

  var isDuplex = this instanceof Duplex;
  this._readableState = new ReadableState(options, this, isDuplex); // legacy

  this.readable = true;

  if (options) {
    if (typeof options.read === 'function') this._read = options.read;
    if (typeof options.destroy === 'function') this._destroy = options.destroy;
  }

  Stream.call(this);
}

Object.defineProperty(Readable.prototype, 'destroyed', {
  // making it explicit this property is not enumerable
  // because otherwise some prototype manipulation in
  // userland will fail
  enumerable: false,
  get: function get() {
    if (this._readableState === undefined) {
      return false;
    }

    return this._readableState.destroyed;
  },
  set: function set(value) {
    // we ignore the value if the stream
    // has not been initialized yet
    if (!this._readableState) {
      return;
    } // backward compatibility, the user is explicitly
    // managing destroyed


    this._readableState.destroyed = value;
  }
});
Readable.prototype.destroy = destroyImpl.destroy;
Readable.prototype._undestroy = destroyImpl.undestroy;

Readable.prototype._destroy = function (err, cb) {
  cb(err);
}; // Manually shove something into the read() buffer.
// This returns true if the highWaterMark has not been hit yet,
// similar to how Writable.write() returns true if you should
// write() some more.


Readable.prototype.push = function (chunk, encoding) {
  var state = this._readableState;
  var skipChunkCheck;

  if (!state.objectMode) {
    if (typeof chunk === 'string') {
      encoding = encoding || state.defaultEncoding;

      if (encoding !== state.encoding) {
        chunk = Buffer.from(chunk, encoding);
        encoding = '';
      }

      skipChunkCheck = true;
    }
  } else {
    skipChunkCheck = true;
  }

  return readableAddChunk(this, chunk, encoding, false, skipChunkCheck);
}; // Unshift should *always* be something directly out of read()


Readable.prototype.unshift = function (chunk) {
  return readableAddChunk(this, chunk, null, true, false);
};

function readableAddChunk(stream, chunk, encoding, addToFront, skipChunkCheck) {
  debug('readableAddChunk', chunk);
  var state = stream._readableState;

  if (chunk === null) {
    state.reading = false;
    onEofChunk(stream, state);
  } else {
    var er;
    if (!skipChunkCheck) er = chunkInvalid(state, chunk);

    if (er) {
      errorOrDestroy(stream, er);
    } else if (state.objectMode || chunk && chunk.length > 0) {
      if (typeof chunk !== 'string' && !state.objectMode && Object.getPrototypeOf(chunk) !== Buffer.prototype) {
        chunk = _uint8ArrayToBuffer(chunk);
      }

      if (addToFront) {
        if (state.endEmitted) errorOrDestroy(stream, new ERR_STREAM_UNSHIFT_AFTER_END_EVENT());else addChunk(stream, state, chunk, true);
      } else if (state.ended) {
        errorOrDestroy(stream, new ERR_STREAM_PUSH_AFTER_EOF());
      } else if (state.destroyed) {
        return false;
      } else {
        state.reading = false;

        if (state.decoder && !encoding) {
          chunk = state.decoder.write(chunk);
          if (state.objectMode || chunk.length !== 0) addChunk(stream, state, chunk, false);else maybeReadMore(stream, state);
        } else {
          addChunk(stream, state, chunk, false);
        }
      }
    } else if (!addToFront) {
      state.reading = false;
      maybeReadMore(stream, state);
    }
  } // We can push more data if we are below the highWaterMark.
  // Also, if we have no data yet, we can stand some more bytes.
  // This is to work around cases where hwm=0, such as the repl.


  return !state.ended && (state.length < state.highWaterMark || state.length === 0);
}

function addChunk(stream, state, chunk, addToFront) {
  if (state.flowing && state.length === 0 && !state.sync) {
    state.awaitDrain = 0;
    stream.emit('data', chunk);
  } else {
    // update the buffer info.
    state.length += state.objectMode ? 1 : chunk.length;
    if (addToFront) state.buffer.unshift(chunk);else state.buffer.push(chunk);
    if (state.needReadable) emitReadable(stream);
  }

  maybeReadMore(stream, state);
}

function chunkInvalid(state, chunk) {
  var er;

  if (!_isUint8Array(chunk) && typeof chunk !== 'string' && chunk !== undefined && !state.objectMode) {
    er = new ERR_INVALID_ARG_TYPE('chunk', ['string', 'Buffer', 'Uint8Array'], chunk);
  }

  return er;
}

Readable.prototype.isPaused = function () {
  return this._readableState.flowing === false;
}; // backwards compatibility.


Readable.prototype.setEncoding = function (enc) {
  if (!StringDecoder) StringDecoder = require('string_decoder/').StringDecoder;
  var decoder = new StringDecoder(enc);
  this._readableState.decoder = decoder; // If setEncoding(null), decoder.encoding equals utf8

  this._readableState.encoding = this._readableState.decoder.encoding; // Iterate over current buffer to convert already stored Buffers:

  var p = this._readableState.buffer.head;
  var content = '';

  while (p !== null) {
    content += decoder.write(p.data);
    p = p.next;
  }

  this._readableState.buffer.clear();

  if (content !== '') this._readableState.buffer.push(content);
  this._readableState.length = content.length;
  return this;
}; // Don't raise the hwm > 1GB


var MAX_HWM = 0x40000000;

function computeNewHighWaterMark(n) {
  if (n >= MAX_HWM) {
    // TODO(ronag): Throw ERR_VALUE_OUT_OF_RANGE.
    n = MAX_HWM;
  } else {
    // Get the next highest power of 2 to prevent increasing hwm excessively in
    // tiny amounts
    n--;
    n |= n >>> 1;
    n |= n >>> 2;
    n |= n >>> 4;
    n |= n >>> 8;
    n |= n >>> 16;
    n++;
  }

  return n;
} // This function is designed to be inlinable, so please take care when making
// changes to the function body.


function howMuchToRead(n, state) {
  if (n <= 0 || state.length === 0 && state.ended) return 0;
  if (state.objectMode) return 1;

  if (n !== n) {
    // Only flow one buffer at a time
    if (state.flowing && state.length) return state.buffer.head.data.length;else return state.length;
  } // If we're asking for more than the current hwm, then raise the hwm.


  if (n > state.highWaterMark) state.highWaterMark = computeNewHighWaterMark(n);
  if (n <= state.length) return n; // Don't have enough

  if (!state.ended) {
    state.needReadable = true;
    return 0;
  }

  return state.length;
} // you can override either this method, or the async _read(n) below.


Readable.prototype.read = function (n) {
  debug('read', n);
  n = parseInt(n, 10);
  var state = this._readableState;
  var nOrig = n;
  if (n !== 0) state.emittedReadable = false; // if we're doing read(0) to trigger a readable event, but we
  // already have a bunch of data in the buffer, then just trigger
  // the 'readable' event and move on.

  if (n === 0 && state.needReadable && ((state.highWaterMark !== 0 ? state.length >= state.highWaterMark : state.length > 0) || state.ended)) {
    debug('read: emitReadable', state.length, state.ended);
    if (state.length === 0 && state.ended) endReadable(this);else emitReadable(this);
    return null;
  }

  n = howMuchToRead(n, state); // if we've ended, and we're now clear, then finish it up.

  if (n === 0 && state.ended) {
    if (state.length === 0) endReadable(this);
    return null;
  } // All the actual chunk generation logic needs to be
  // *below* the call to _read.  The reason is that in certain
  // synthetic stream cases, such as passthrough streams, _read
  // may be a completely synchronous operation which may change
  // the state of the read buffer, providing enough data when
  // before there was *not* enough.
  //
  // So, the steps are:
  // 1. Figure out what the state of things will be after we do
  // a read from the buffer.
  //
  // 2. If that resulting state will trigger a _read, then call _read.
  // Note that this may be asynchronous, or synchronous.  Yes, it is
  // deeply ugly to write APIs this way, but that still doesn't mean
  // that the Readable class should behave improperly, as streams are
  // designed to be sync/async agnostic.
  // Take note if the _read call is sync or async (ie, if the read call
  // has returned yet), so that we know whether or not it's safe to emit
  // 'readable' etc.
  //
  // 3. Actually pull the requested chunks out of the buffer and return.
  // if we need a readable event, then we need to do some reading.


  var doRead = state.needReadable;
  debug('need readable', doRead); // if we currently have less than the highWaterMark, then also read some

  if (state.length === 0 || state.length - n < state.highWaterMark) {
    doRead = true;
    debug('length less than watermark', doRead);
  } // however, if we've ended, then there's no point, and if we're already
  // reading, then it's unnecessary.


  if (state.ended || state.reading) {
    doRead = false;
    debug('reading or ended', doRead);
  } else if (doRead) {
    debug('do read');
    state.reading = true;
    state.sync = true; // if the length is currently zero, then we *need* a readable event.

    if (state.length === 0) state.needReadable = true; // call internal read method

    this._read(state.highWaterMark);

    state.sync = false; // If _read pushed data synchronously, then `reading` will be false,
    // and we need to re-evaluate how much data we can return to the user.

    if (!state.reading) n = howMuchToRead(nOrig, state);
  }

  var ret;
  if (n > 0) ret = fromList(n, state);else ret = null;

  if (ret === null) {
    state.needReadable = state.length <= state.highWaterMark;
    n = 0;
  } else {
    state.length -= n;
    state.awaitDrain = 0;
  }

  if (state.length === 0) {
    // If we have nothing in the buffer, then we want to know
    // as soon as we *do* get something into the buffer.
    if (!state.ended) state.needReadable = true; // If we tried to read() past the EOF, then emit end on the next tick.

    if (nOrig !== n && state.ended) endReadable(this);
  }

  if (ret !== null) this.emit('data', ret);
  return ret;
};

function onEofChunk(stream, state) {
  debug('onEofChunk');
  if (state.ended) return;

  if (state.decoder) {
    var chunk = state.decoder.end();

    if (chunk && chunk.length) {
      state.buffer.push(chunk);
      state.length += state.objectMode ? 1 : chunk.length;
    }
  }

  state.ended = true;

  if (state.sync) {
    // if we are sync, wait until next tick to emit the data.
    // Otherwise we risk emitting data in the flow()
    // the readable code triggers during a read() call
    emitReadable(stream);
  } else {
    // emit 'readable' now to make sure it gets picked up.
    state.needReadable = false;

    if (!state.emittedReadable) {
      state.emittedReadable = true;
      emitReadable_(stream);
    }
  }
} // Don't emit readable right away in sync mode, because this can trigger
// another read() call => stack overflow.  This way, it might trigger
// a nextTick recursion warning, but that's not so bad.


function emitReadable(stream) {
  var state = stream._readableState;
  debug('emitReadable', state.needReadable, state.emittedReadable);
  state.needReadable = false;

  if (!state.emittedReadable) {
    debug('emitReadable', state.flowing);
    state.emittedReadable = true;
    process.nextTick(emitReadable_, stream);
  }
}

function emitReadable_(stream) {
  var state = stream._readableState;
  debug('emitReadable_', state.destroyed, state.length, state.ended);

  if (!state.destroyed && (state.length || state.ended)) {
    stream.emit('readable');
    state.emittedReadable = false;
  } // The stream needs another readable event if
  // 1. It is not flowing, as the flow mechanism will take
  //    care of it.
  // 2. It is not ended.
  // 3. It is below the highWaterMark, so we can schedule
  //    another readable later.


  state.needReadable = !state.flowing && !state.ended && state.length <= state.highWaterMark;
  flow(stream);
} // at this point, the user has presumably seen the 'readable' event,
// and called read() to consume some data.  that may have triggered
// in turn another _read(n) call, in which case reading = true if
// it's in progress.
// However, if we're not ended, or reading, and the length < hwm,
// then go ahead and try to read some more preemptively.


function maybeReadMore(stream, state) {
  if (!state.readingMore) {
    state.readingMore = true;
    process.nextTick(maybeReadMore_, stream, state);
  }
}

function maybeReadMore_(stream, state) {
  // Attempt to read more data if we should.
  //
  // The conditions for reading more data are (one of):
  // - Not enough data buffered (state.length < state.highWaterMark). The loop
  //   is responsible for filling the buffer with enough data if such data
  //   is available. If highWaterMark is 0 and we are not in the flowing mode
  //   we should _not_ attempt to buffer any extra data. We'll get more data
  //   when the stream consumer calls read() instead.
  // - No data in the buffer, and the stream is in flowing mode. In this mode
  //   the loop below is responsible for ensuring read() is called. Failing to
  //   call read here would abort the flow and there's no other mechanism for
  //   continuing the flow if the stream consumer has just subscribed to the
  //   'data' event.
  //
  // In addition to the above conditions to keep reading data, the following
  // conditions prevent the data from being read:
  // - The stream has ended (state.ended).
  // - There is already a pending 'read' operation (state.reading). This is a
  //   case where the the stream has called the implementation defined _read()
  //   method, but they are processing the call asynchronously and have _not_
  //   called push() with new data. In this case we skip performing more
  //   read()s. The execution ends in this method again after the _read() ends
  //   up calling push() with more data.
  while (!state.reading && !state.ended && (state.length < state.highWaterMark || state.flowing && state.length === 0)) {
    var len = state.length;
    debug('maybeReadMore read 0');
    stream.read(0);
    if (len === state.length) // didn't get any data, stop spinning.
      break;
  }

  state.readingMore = false;
} // abstract method.  to be overridden in specific implementation classes.
// call cb(er, data) where data is <= n in length.
// for virtual (non-string, non-buffer) streams, "length" is somewhat
// arbitrary, and perhaps not very meaningful.


Readable.prototype._read = function (n) {
  errorOrDestroy(this, new ERR_METHOD_NOT_IMPLEMENTED('_read()'));
};

Readable.prototype.pipe = function (dest, pipeOpts) {
  var src = this;
  var state = this._readableState;

  switch (state.pipesCount) {
    case 0:
      state.pipes = dest;
      break;

    case 1:
      state.pipes = [state.pipes, dest];
      break;

    default:
      state.pipes.push(dest);
      break;
  }

  state.pipesCount += 1;
  debug('pipe count=%d opts=%j', state.pipesCount, pipeOpts);
  var doEnd = (!pipeOpts || pipeOpts.end !== false) && dest !== process.stdout && dest !== process.stderr;
  var endFn = doEnd ? onend : unpipe;
  if (state.endEmitted) process.nextTick(endFn);else src.once('end', endFn);
  dest.on('unpipe', onunpipe);

  function onunpipe(readable, unpipeInfo) {
    debug('onunpipe');

    if (readable === src) {
      if (unpipeInfo && unpipeInfo.hasUnpiped === false) {
        unpipeInfo.hasUnpiped = true;
        cleanup();
      }
    }
  }

  function onend() {
    debug('onend');
    dest.end();
  } // when the dest drains, it reduces the awaitDrain counter
  // on the source.  This would be more elegant with a .once()
  // handler in flow(), but adding and removing repeatedly is
  // too slow.


  var ondrain = pipeOnDrain(src);
  dest.on('drain', ondrain);
  var cleanedUp = false;

  function cleanup() {
    debug('cleanup'); // cleanup event handlers once the pipe is broken

    dest.removeListener('close', onclose);
    dest.removeListener('finish', onfinish);
    dest.removeListener('drain', ondrain);
    dest.removeListener('error', onerror);
    dest.removeListener('unpipe', onunpipe);
    src.removeListener('end', onend);
    src.removeListener('end', unpipe);
    src.removeListener('data', ondata);
    cleanedUp = true; // if the reader is waiting for a drain event from this
    // specific writer, then it would cause it to never start
    // flowing again.
    // So, if this is awaiting a drain, then we just call it now.
    // If we don't know, then assume that we are waiting for one.

    if (state.awaitDrain && (!dest._writableState || dest._writableState.needDrain)) ondrain();
  }

  src.on('data', ondata);

  function ondata(chunk) {
    debug('ondata');
    var ret = dest.write(chunk);
    debug('dest.write', ret);

    if (ret === false) {
      // If the user unpiped during `dest.write()`, it is possible
      // to get stuck in a permanently paused state if that write
      // also returned false.
      // => Check whether `dest` is still a piping destination.
      if ((state.pipesCount === 1 && state.pipes === dest || state.pipesCount > 1 && indexOf(state.pipes, dest) !== -1) && !cleanedUp) {
        debug('false write response, pause', state.awaitDrain);
        state.awaitDrain++;
      }

      src.pause();
    }
  } // if the dest has an error, then stop piping into it.
  // however, don't suppress the throwing behavior for this.


  function onerror(er) {
    debug('onerror', er);
    unpipe();
    dest.removeListener('error', onerror);
    if (EElistenerCount(dest, 'error') === 0) errorOrDestroy(dest, er);
  } // Make sure our error handler is attached before userland ones.


  prependListener(dest, 'error', onerror); // Both close and finish should trigger unpipe, but only once.

  function onclose() {
    dest.removeListener('finish', onfinish);
    unpipe();
  }

  dest.once('close', onclose);

  function onfinish() {
    debug('onfinish');
    dest.removeListener('close', onclose);
    unpipe();
  }

  dest.once('finish', onfinish);

  function unpipe() {
    debug('unpipe');
    src.unpipe(dest);
  } // tell the dest that it's being piped to


  dest.emit('pipe', src); // start the flow if it hasn't been started already.

  if (!state.flowing) {
    debug('pipe resume');
    src.resume();
  }

  return dest;
};

function pipeOnDrain(src) {
  return function pipeOnDrainFunctionResult() {
    var state = src._readableState;
    debug('pipeOnDrain', state.awaitDrain);
    if (state.awaitDrain) state.awaitDrain--;

    if (state.awaitDrain === 0 && EElistenerCount(src, 'data')) {
      state.flowing = true;
      flow(src);
    }
  };
}

Readable.prototype.unpipe = function (dest) {
  var state = this._readableState;
  var unpipeInfo = {
    hasUnpiped: false
  }; // if we're not piping anywhere, then do nothing.

  if (state.pipesCount === 0) return this; // just one destination.  most common case.

  if (state.pipesCount === 1) {
    // passed in one, but it's not the right one.
    if (dest && dest !== state.pipes) return this;
    if (!dest) dest = state.pipes; // got a match.

    state.pipes = null;
    state.pipesCount = 0;
    state.flowing = false;
    if (dest) dest.emit('unpipe', this, unpipeInfo);
    return this;
  } // slow case. multiple pipe destinations.


  if (!dest) {
    // remove all.
    var dests = state.pipes;
    var len = state.pipesCount;
    state.pipes = null;
    state.pipesCount = 0;
    state.flowing = false;

    for (var i = 0; i < len; i++) {
      dests[i].emit('unpipe', this, {
        hasUnpiped: false
      });
    }

    return this;
  } // try to find the right one.


  var index = indexOf(state.pipes, dest);
  if (index === -1) return this;
  state.pipes.splice(index, 1);
  state.pipesCount -= 1;
  if (state.pipesCount === 1) state.pipes = state.pipes[0];
  dest.emit('unpipe', this, unpipeInfo);
  return this;
}; // set up data events if they are asked for
// Ensure readable listeners eventually get something


Readable.prototype.on = function (ev, fn) {
  var res = Stream.prototype.on.call(this, ev, fn);
  var state = this._readableState;

  if (ev === 'data') {
    // update readableListening so that resume() may be a no-op
    // a few lines down. This is needed to support once('readable').
    state.readableListening = this.listenerCount('readable') > 0; // Try start flowing on next tick if stream isn't explicitly paused

    if (state.flowing !== false) this.resume();
  } else if (ev === 'readable') {
    if (!state.endEmitted && !state.readableListening) {
      state.readableListening = state.needReadable = true;
      state.flowing = false;
      state.emittedReadable = false;
      debug('on readable', state.length, state.reading);

      if (state.length) {
        emitReadable(this);
      } else if (!state.reading) {
        process.nextTick(nReadingNextTick, this);
      }
    }
  }

  return res;
};

Readable.prototype.addListener = Readable.prototype.on;

Readable.prototype.removeListener = function (ev, fn) {
  var res = Stream.prototype.removeListener.call(this, ev, fn);

  if (ev === 'readable') {
    // We need to check if there is someone still listening to
    // readable and reset the state. However this needs to happen
    // after readable has been emitted but before I/O (nextTick) to
    // support once('readable', fn) cycles. This means that calling
    // resume within the same tick will have no
    // effect.
    process.nextTick(updateReadableListening, this);
  }

  return res;
};

Readable.prototype.removeAllListeners = function (ev) {
  var res = Stream.prototype.removeAllListeners.apply(this, arguments);

  if (ev === 'readable' || ev === undefined) {
    // We need to check if there is someone still listening to
    // readable and reset the state. However this needs to happen
    // after readable has been emitted but before I/O (nextTick) to
    // support once('readable', fn) cycles. This means that calling
    // resume within the same tick will have no
    // effect.
    process.nextTick(updateReadableListening, this);
  }

  return res;
};

function updateReadableListening(self) {
  var state = self._readableState;
  state.readableListening = self.listenerCount('readable') > 0;

  if (state.resumeScheduled && !state.paused) {
    // flowing needs to be set to true now, otherwise
    // the upcoming resume will not flow.
    state.flowing = true; // crude way to check if we should resume
  } else if (self.listenerCount('data') > 0) {
    self.resume();
  }
}

function nReadingNextTick(self) {
  debug('readable nexttick read 0');
  self.read(0);
} // pause() and resume() are remnants of the legacy readable stream API
// If the user uses them, then switch into old mode.


Readable.prototype.resume = function () {
  var state = this._readableState;

  if (!state.flowing) {
    debug('resume'); // we flow only if there is no one listening
    // for readable, but we still have to call
    // resume()

    state.flowing = !state.readableListening;
    resume(this, state);
  }

  state.paused = false;
  return this;
};

function resume(stream, state) {
  if (!state.resumeScheduled) {
    state.resumeScheduled = true;
    process.nextTick(resume_, stream, state);
  }
}

function resume_(stream, state) {
  debug('resume', state.reading);

  if (!state.reading) {
    stream.read(0);
  }

  state.resumeScheduled = false;
  stream.emit('resume');
  flow(stream);
  if (state.flowing && !state.reading) stream.read(0);
}

Readable.prototype.pause = function () {
  debug('call pause flowing=%j', this._readableState.flowing);

  if (this._readableState.flowing !== false) {
    debug('pause');
    this._readableState.flowing = false;
    this.emit('pause');
  }

  this._readableState.paused = true;
  return this;
};

function flow(stream) {
  var state = stream._readableState;
  debug('flow', state.flowing);

  while (state.flowing && stream.read() !== null) {
    ;
  }
} // wrap an old-style stream as the async data source.
// This is *not* part of the readable stream interface.
// It is an ugly unfortunate mess of history.


Readable.prototype.wrap = function (stream) {
  var _this = this;

  var state = this._readableState;
  var paused = false;
  stream.on('end', function () {
    debug('wrapped end');

    if (state.decoder && !state.ended) {
      var chunk = state.decoder.end();
      if (chunk && chunk.length) _this.push(chunk);
    }

    _this.push(null);
  });
  stream.on('data', function (chunk) {
    debug('wrapped data');
    if (state.decoder) chunk = state.decoder.write(chunk); // don't skip over falsy values in objectMode

    if (state.objectMode && (chunk === null || chunk === undefined)) return;else if (!state.objectMode && (!chunk || !chunk.length)) return;

    var ret = _this.push(chunk);

    if (!ret) {
      paused = true;
      stream.pause();
    }
  }); // proxy all the other methods.
  // important when wrapping filters and duplexes.

  for (var i in stream) {
    if (this[i] === undefined && typeof stream[i] === 'function') {
      this[i] = function methodWrap(method) {
        return function methodWrapReturnFunction() {
          return stream[method].apply(stream, arguments);
        };
      }(i);
    }
  } // proxy certain important events.


  for (var n = 0; n < kProxyEvents.length; n++) {
    stream.on(kProxyEvents[n], this.emit.bind(this, kProxyEvents[n]));
  } // when we try to consume some more bytes, simply unpause the
  // underlying stream.


  this._read = function (n) {
    debug('wrapped _read', n);

    if (paused) {
      paused = false;
      stream.resume();
    }
  };

  return this;
};

if (typeof Symbol === 'function') {
  Readable.prototype[Symbol.asyncIterator] = function () {
    if (createReadableStreamAsyncIterator === undefined) {
      createReadableStreamAsyncIterator = require('./internal/streams/async_iterator');
    }

    return createReadableStreamAsyncIterator(this);
  };
}

Object.defineProperty(Readable.prototype, 'readableHighWaterMark', {
  // making it explicit this property is not enumerable
  // because otherwise some prototype manipulation in
  // userland will fail
  enumerable: false,
  get: function get() {
    return this._readableState.highWaterMark;
  }
});
Object.defineProperty(Readable.prototype, 'readableBuffer', {
  // making it explicit this property is not enumerable
  // because otherwise some prototype manipulation in
  // userland will fail
  enumerable: false,
  get: function get() {
    return this._readableState && this._readableState.buffer;
  }
});
Object.defineProperty(Readable.prototype, 'readableFlowing', {
  // making it explicit this property is not enumerable
  // because otherwise some prototype manipulation in
  // userland will fail
  enumerable: false,
  get: function get() {
    return this._readableState.flowing;
  },
  set: function set(state) {
    if (this._readableState) {
      this._readableState.flowing = state;
    }
  }
}); // exposed for testing purposes only.

Readable._fromList = fromList;
Object.defineProperty(Readable.prototype, 'readableLength', {
  // making it explicit this property is not enumerable
  // because otherwise some prototype manipulation in
  // userland will fail
  enumerable: false,
  get: function get() {
    return this._readableState.length;
  }
}); // Pluck off n bytes from an array of buffers.
// Length is the combined lengths of all the buffers in the list.
// This function is designed to be inlinable, so please take care when making
// changes to the function body.

function fromList(n, state) {
  // nothing buffered
  if (state.length === 0) return null;
  var ret;
  if (state.objectMode) ret = state.buffer.shift();else if (!n || n >= state.length) {
    // read it all, truncate the list
    if (state.decoder) ret = state.buffer.join('');else if (state.buffer.length === 1) ret = state.buffer.first();else ret = state.buffer.concat(state.length);
    state.buffer.clear();
  } else {
    // read part of list
    ret = state.buffer.consume(n, state.decoder);
  }
  return ret;
}

function endReadable(stream) {
  var state = stream._readableState;
  debug('endReadable', state.endEmitted);

  if (!state.endEmitted) {
    state.ended = true;
    process.nextTick(endReadableNT, state, stream);
  }
}

function endReadableNT(state, stream) {
  debug('endReadableNT', state.endEmitted, state.length); // Check that we didn't get one last unshift.

  if (!state.endEmitted && state.length === 0) {
    state.endEmitted = true;
    stream.readable = false;
    stream.emit('end');

    if (state.autoDestroy) {
      // In case of duplex streams we need a way to detect
      // if the writable side is ready for autoDestroy as well
      var wState = stream._writableState;

      if (!wState || wState.autoDestroy && wState.finished) {
        stream.destroy();
      }
    }
  }
}

if (typeof Symbol === 'function') {
  Readable.from = function (iterable, opts) {
    if (from === undefined) {
      from = require('./internal/streams/from');
    }

    return from(Readable, iterable, opts);
  };
}

function indexOf(xs, x) {
  for (var i = 0, l = xs.length; i < l; i++) {
    if (xs[i] === x) return i;
  }

  return -1;
}
}).call(this)}).call(this,require('_process'),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{"../errors":55,"./_stream_duplex":56,"./internal/streams/async_iterator":61,"./internal/streams/buffer_list":62,"./internal/streams/destroy":63,"./internal/streams/from":65,"./internal/streams/state":67,"./internal/streams/stream":68,"_process":50,"buffer":17,"events":22,"inherits":24,"string_decoder/":75,"util":16}],59:[function(require,module,exports){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
// a transform stream is a readable/writable stream where you do
// something with the data.  Sometimes it's called a "filter",
// but that's not a great name for it, since that implies a thing where
// some bits pass through, and others are simply ignored.  (That would
// be a valid example of a transform, of course.)
//
// While the output is causally related to the input, it's not a
// necessarily symmetric or synchronous transformation.  For example,
// a zlib stream might take multiple plain-text writes(), and then
// emit a single compressed chunk some time in the future.
//
// Here's how this works:
//
// The Transform stream has all the aspects of the readable and writable
// stream classes.  When you write(chunk), that calls _write(chunk,cb)
// internally, and returns false if there's a lot of pending writes
// buffered up.  When you call read(), that calls _read(n) until
// there's enough pending readable data buffered up.
//
// In a transform stream, the written data is placed in a buffer.  When
// _read(n) is called, it transforms the queued up data, calling the
// buffered _write cb's as it consumes chunks.  If consuming a single
// written chunk would result in multiple output chunks, then the first
// outputted bit calls the readcb, and subsequent chunks just go into
// the read buffer, and will cause it to emit 'readable' if necessary.
//
// This way, back-pressure is actually determined by the reading side,
// since _read has to be called to start processing a new chunk.  However,
// a pathological inflate type of transform can cause excessive buffering
// here.  For example, imagine a stream where every byte of input is
// interpreted as an integer from 0-255, and then results in that many
// bytes of output.  Writing the 4 bytes {ff,ff,ff,ff} would result in
// 1kb of data being output.  In this case, you could write a very small
// amount of input, and end up with a very large amount of output.  In
// such a pathological inflating mechanism, there'd be no way to tell
// the system to stop doing the transform.  A single 4MB write could
// cause the system to run out of memory.
//
// However, even in such a pathological case, only a single written chunk
// would be consumed, and then the rest would wait (un-transformed) until
// the results of the previous transformed chunk were consumed.
'use strict';

module.exports = Transform;

var _require$codes = require('../errors').codes,
    ERR_METHOD_NOT_IMPLEMENTED = _require$codes.ERR_METHOD_NOT_IMPLEMENTED,
    ERR_MULTIPLE_CALLBACK = _require$codes.ERR_MULTIPLE_CALLBACK,
    ERR_TRANSFORM_ALREADY_TRANSFORMING = _require$codes.ERR_TRANSFORM_ALREADY_TRANSFORMING,
    ERR_TRANSFORM_WITH_LENGTH_0 = _require$codes.ERR_TRANSFORM_WITH_LENGTH_0;

var Duplex = require('./_stream_duplex');

require('inherits')(Transform, Duplex);

function afterTransform(er, data) {
  var ts = this._transformState;
  ts.transforming = false;
  var cb = ts.writecb;

  if (cb === null) {
    return this.emit('error', new ERR_MULTIPLE_CALLBACK());
  }

  ts.writechunk = null;
  ts.writecb = null;
  if (data != null) // single equals check for both `null` and `undefined`
    this.push(data);
  cb(er);
  var rs = this._readableState;
  rs.reading = false;

  if (rs.needReadable || rs.length < rs.highWaterMark) {
    this._read(rs.highWaterMark);
  }
}

function Transform(options) {
  if (!(this instanceof Transform)) return new Transform(options);
  Duplex.call(this, options);
  this._transformState = {
    afterTransform: afterTransform.bind(this),
    needTransform: false,
    transforming: false,
    writecb: null,
    writechunk: null,
    writeencoding: null
  }; // start out asking for a readable event once data is transformed.

  this._readableState.needReadable = true; // we have implemented the _read method, and done the other things
  // that Readable wants before the first _read call, so unset the
  // sync guard flag.

  this._readableState.sync = false;

  if (options) {
    if (typeof options.transform === 'function') this._transform = options.transform;
    if (typeof options.flush === 'function') this._flush = options.flush;
  } // When the writable side finishes, then flush out anything remaining.


  this.on('prefinish', prefinish);
}

function prefinish() {
  var _this = this;

  if (typeof this._flush === 'function' && !this._readableState.destroyed) {
    this._flush(function (er, data) {
      done(_this, er, data);
    });
  } else {
    done(this, null, null);
  }
}

Transform.prototype.push = function (chunk, encoding) {
  this._transformState.needTransform = false;
  return Duplex.prototype.push.call(this, chunk, encoding);
}; // This is the part where you do stuff!
// override this function in implementation classes.
// 'chunk' is an input chunk.
//
// Call `push(newChunk)` to pass along transformed output
// to the readable side.  You may call 'push' zero or more times.
//
// Call `cb(err)` when you are done with this chunk.  If you pass
// an error, then that'll put the hurt on the whole operation.  If you
// never call cb(), then you'll never get another chunk.


Transform.prototype._transform = function (chunk, encoding, cb) {
  cb(new ERR_METHOD_NOT_IMPLEMENTED('_transform()'));
};

Transform.prototype._write = function (chunk, encoding, cb) {
  var ts = this._transformState;
  ts.writecb = cb;
  ts.writechunk = chunk;
  ts.writeencoding = encoding;

  if (!ts.transforming) {
    var rs = this._readableState;
    if (ts.needTransform || rs.needReadable || rs.length < rs.highWaterMark) this._read(rs.highWaterMark);
  }
}; // Doesn't matter what the args are here.
// _transform does all the work.
// That we got here means that the readable side wants more data.


Transform.prototype._read = function (n) {
  var ts = this._transformState;

  if (ts.writechunk !== null && !ts.transforming) {
    ts.transforming = true;

    this._transform(ts.writechunk, ts.writeencoding, ts.afterTransform);
  } else {
    // mark that we need a transform, so that any data that comes in
    // will get processed, now that we've asked for it.
    ts.needTransform = true;
  }
};

Transform.prototype._destroy = function (err, cb) {
  Duplex.prototype._destroy.call(this, err, function (err2) {
    cb(err2);
  });
};

function done(stream, er, data) {
  if (er) return stream.emit('error', er);
  if (data != null) // single equals check for both `null` and `undefined`
    stream.push(data); // TODO(BridgeAR): Write a test for these two error cases
  // if there's nothing in the write buffer, then that means
  // that nothing more will ever be provided

  if (stream._writableState.length) throw new ERR_TRANSFORM_WITH_LENGTH_0();
  if (stream._transformState.transforming) throw new ERR_TRANSFORM_ALREADY_TRANSFORMING();
  return stream.push(null);
}
},{"../errors":55,"./_stream_duplex":56,"inherits":24}],60:[function(require,module,exports){
(function (process,global){(function (){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
// A bit simpler than readable streams.
// Implement an async ._write(chunk, encoding, cb), and it'll handle all
// the drain event emission and buffering.
'use strict';

module.exports = Writable;
/* <replacement> */

function WriteReq(chunk, encoding, cb) {
  this.chunk = chunk;
  this.encoding = encoding;
  this.callback = cb;
  this.next = null;
} // It seems a linked list but it is not
// there will be only 2 of these for each stream


function CorkedRequest(state) {
  var _this = this;

  this.next = null;
  this.entry = null;

  this.finish = function () {
    onCorkedFinish(_this, state);
  };
}
/* </replacement> */

/*<replacement>*/


var Duplex;
/*</replacement>*/

Writable.WritableState = WritableState;
/*<replacement>*/

var internalUtil = {
  deprecate: require('util-deprecate')
};
/*</replacement>*/

/*<replacement>*/

var Stream = require('./internal/streams/stream');
/*</replacement>*/


var Buffer = require('buffer').Buffer;

var OurUint8Array = global.Uint8Array || function () {};

function _uint8ArrayToBuffer(chunk) {
  return Buffer.from(chunk);
}

function _isUint8Array(obj) {
  return Buffer.isBuffer(obj) || obj instanceof OurUint8Array;
}

var destroyImpl = require('./internal/streams/destroy');

var _require = require('./internal/streams/state'),
    getHighWaterMark = _require.getHighWaterMark;

var _require$codes = require('../errors').codes,
    ERR_INVALID_ARG_TYPE = _require$codes.ERR_INVALID_ARG_TYPE,
    ERR_METHOD_NOT_IMPLEMENTED = _require$codes.ERR_METHOD_NOT_IMPLEMENTED,
    ERR_MULTIPLE_CALLBACK = _require$codes.ERR_MULTIPLE_CALLBACK,
    ERR_STREAM_CANNOT_PIPE = _require$codes.ERR_STREAM_CANNOT_PIPE,
    ERR_STREAM_DESTROYED = _require$codes.ERR_STREAM_DESTROYED,
    ERR_STREAM_NULL_VALUES = _require$codes.ERR_STREAM_NULL_VALUES,
    ERR_STREAM_WRITE_AFTER_END = _require$codes.ERR_STREAM_WRITE_AFTER_END,
    ERR_UNKNOWN_ENCODING = _require$codes.ERR_UNKNOWN_ENCODING;

var errorOrDestroy = destroyImpl.errorOrDestroy;

require('inherits')(Writable, Stream);

function nop() {}

function WritableState(options, stream, isDuplex) {
  Duplex = Duplex || require('./_stream_duplex');
  options = options || {}; // Duplex streams are both readable and writable, but share
  // the same options object.
  // However, some cases require setting options to different
  // values for the readable and the writable sides of the duplex stream,
  // e.g. options.readableObjectMode vs. options.writableObjectMode, etc.

  if (typeof isDuplex !== 'boolean') isDuplex = stream instanceof Duplex; // object stream flag to indicate whether or not this stream
  // contains buffers or objects.

  this.objectMode = !!options.objectMode;
  if (isDuplex) this.objectMode = this.objectMode || !!options.writableObjectMode; // the point at which write() starts returning false
  // Note: 0 is a valid value, means that we always return false if
  // the entire buffer is not flushed immediately on write()

  this.highWaterMark = getHighWaterMark(this, options, 'writableHighWaterMark', isDuplex); // if _final has been called

  this.finalCalled = false; // drain event flag.

  this.needDrain = false; // at the start of calling end()

  this.ending = false; // when end() has been called, and returned

  this.ended = false; // when 'finish' is emitted

  this.finished = false; // has it been destroyed

  this.destroyed = false; // should we decode strings into buffers before passing to _write?
  // this is here so that some node-core streams can optimize string
  // handling at a lower level.

  var noDecode = options.decodeStrings === false;
  this.decodeStrings = !noDecode; // Crypto is kind of old and crusty.  Historically, its default string
  // encoding is 'binary' so we have to make this configurable.
  // Everything else in the universe uses 'utf8', though.

  this.defaultEncoding = options.defaultEncoding || 'utf8'; // not an actual buffer we keep track of, but a measurement
  // of how much we're waiting to get pushed to some underlying
  // socket or file.

  this.length = 0; // a flag to see when we're in the middle of a write.

  this.writing = false; // when true all writes will be buffered until .uncork() call

  this.corked = 0; // a flag to be able to tell if the onwrite cb is called immediately,
  // or on a later tick.  We set this to true at first, because any
  // actions that shouldn't happen until "later" should generally also
  // not happen before the first write call.

  this.sync = true; // a flag to know if we're processing previously buffered items, which
  // may call the _write() callback in the same tick, so that we don't
  // end up in an overlapped onwrite situation.

  this.bufferProcessing = false; // the callback that's passed to _write(chunk,cb)

  this.onwrite = function (er) {
    onwrite(stream, er);
  }; // the callback that the user supplies to write(chunk,encoding,cb)


  this.writecb = null; // the amount that is being written when _write is called.

  this.writelen = 0;
  this.bufferedRequest = null;
  this.lastBufferedRequest = null; // number of pending user-supplied write callbacks
  // this must be 0 before 'finish' can be emitted

  this.pendingcb = 0; // emit prefinish if the only thing we're waiting for is _write cbs
  // This is relevant for synchronous Transform streams

  this.prefinished = false; // True if the error was already emitted and should not be thrown again

  this.errorEmitted = false; // Should close be emitted on destroy. Defaults to true.

  this.emitClose = options.emitClose !== false; // Should .destroy() be called after 'finish' (and potentially 'end')

  this.autoDestroy = !!options.autoDestroy; // count buffered requests

  this.bufferedRequestCount = 0; // allocate the first CorkedRequest, there is always
  // one allocated and free to use, and we maintain at most two

  this.corkedRequestsFree = new CorkedRequest(this);
}

WritableState.prototype.getBuffer = function getBuffer() {
  var current = this.bufferedRequest;
  var out = [];

  while (current) {
    out.push(current);
    current = current.next;
  }

  return out;
};

(function () {
  try {
    Object.defineProperty(WritableState.prototype, 'buffer', {
      get: internalUtil.deprecate(function writableStateBufferGetter() {
        return this.getBuffer();
      }, '_writableState.buffer is deprecated. Use _writableState.getBuffer ' + 'instead.', 'DEP0003')
    });
  } catch (_) {}
})(); // Test _writableState for inheritance to account for Duplex streams,
// whose prototype chain only points to Readable.


var realHasInstance;

if (typeof Symbol === 'function' && Symbol.hasInstance && typeof Function.prototype[Symbol.hasInstance] === 'function') {
  realHasInstance = Function.prototype[Symbol.hasInstance];
  Object.defineProperty(Writable, Symbol.hasInstance, {
    value: function value(object) {
      if (realHasInstance.call(this, object)) return true;
      if (this !== Writable) return false;
      return object && object._writableState instanceof WritableState;
    }
  });
} else {
  realHasInstance = function realHasInstance(object) {
    return object instanceof this;
  };
}

function Writable(options) {
  Duplex = Duplex || require('./_stream_duplex'); // Writable ctor is applied to Duplexes, too.
  // `realHasInstance` is necessary because using plain `instanceof`
  // would return false, as no `_writableState` property is attached.
  // Trying to use the custom `instanceof` for Writable here will also break the
  // Node.js LazyTransform implementation, which has a non-trivial getter for
  // `_writableState` that would lead to infinite recursion.
  // Checking for a Stream.Duplex instance is faster here instead of inside
  // the WritableState constructor, at least with V8 6.5

  var isDuplex = this instanceof Duplex;
  if (!isDuplex && !realHasInstance.call(Writable, this)) return new Writable(options);
  this._writableState = new WritableState(options, this, isDuplex); // legacy.

  this.writable = true;

  if (options) {
    if (typeof options.write === 'function') this._write = options.write;
    if (typeof options.writev === 'function') this._writev = options.writev;
    if (typeof options.destroy === 'function') this._destroy = options.destroy;
    if (typeof options.final === 'function') this._final = options.final;
  }

  Stream.call(this);
} // Otherwise people can pipe Writable streams, which is just wrong.


Writable.prototype.pipe = function () {
  errorOrDestroy(this, new ERR_STREAM_CANNOT_PIPE());
};

function writeAfterEnd(stream, cb) {
  var er = new ERR_STREAM_WRITE_AFTER_END(); // TODO: defer error events consistently everywhere, not just the cb

  errorOrDestroy(stream, er);
  process.nextTick(cb, er);
} // Checks that a user-supplied chunk is valid, especially for the particular
// mode the stream is in. Currently this means that `null` is never accepted
// and undefined/non-string values are only allowed in object mode.


function validChunk(stream, state, chunk, cb) {
  var er;

  if (chunk === null) {
    er = new ERR_STREAM_NULL_VALUES();
  } else if (typeof chunk !== 'string' && !state.objectMode) {
    er = new ERR_INVALID_ARG_TYPE('chunk', ['string', 'Buffer'], chunk);
  }

  if (er) {
    errorOrDestroy(stream, er);
    process.nextTick(cb, er);
    return false;
  }

  return true;
}

Writable.prototype.write = function (chunk, encoding, cb) {
  var state = this._writableState;
  var ret = false;

  var isBuf = !state.objectMode && _isUint8Array(chunk);

  if (isBuf && !Buffer.isBuffer(chunk)) {
    chunk = _uint8ArrayToBuffer(chunk);
  }

  if (typeof encoding === 'function') {
    cb = encoding;
    encoding = null;
  }

  if (isBuf) encoding = 'buffer';else if (!encoding) encoding = state.defaultEncoding;
  if (typeof cb !== 'function') cb = nop;
  if (state.ending) writeAfterEnd(this, cb);else if (isBuf || validChunk(this, state, chunk, cb)) {
    state.pendingcb++;
    ret = writeOrBuffer(this, state, isBuf, chunk, encoding, cb);
  }
  return ret;
};

Writable.prototype.cork = function () {
  this._writableState.corked++;
};

Writable.prototype.uncork = function () {
  var state = this._writableState;

  if (state.corked) {
    state.corked--;
    if (!state.writing && !state.corked && !state.bufferProcessing && state.bufferedRequest) clearBuffer(this, state);
  }
};

Writable.prototype.setDefaultEncoding = function setDefaultEncoding(encoding) {
  // node::ParseEncoding() requires lower case.
  if (typeof encoding === 'string') encoding = encoding.toLowerCase();
  if (!(['hex', 'utf8', 'utf-8', 'ascii', 'binary', 'base64', 'ucs2', 'ucs-2', 'utf16le', 'utf-16le', 'raw'].indexOf((encoding + '').toLowerCase()) > -1)) throw new ERR_UNKNOWN_ENCODING(encoding);
  this._writableState.defaultEncoding = encoding;
  return this;
};

Object.defineProperty(Writable.prototype, 'writableBuffer', {
  // making it explicit this property is not enumerable
  // because otherwise some prototype manipulation in
  // userland will fail
  enumerable: false,
  get: function get() {
    return this._writableState && this._writableState.getBuffer();
  }
});

function decodeChunk(state, chunk, encoding) {
  if (!state.objectMode && state.decodeStrings !== false && typeof chunk === 'string') {
    chunk = Buffer.from(chunk, encoding);
  }

  return chunk;
}

Object.defineProperty(Writable.prototype, 'writableHighWaterMark', {
  // making it explicit this property is not enumerable
  // because otherwise some prototype manipulation in
  // userland will fail
  enumerable: false,
  get: function get() {
    return this._writableState.highWaterMark;
  }
}); // if we're already writing something, then just put this
// in the queue, and wait our turn.  Otherwise, call _write
// If we return false, then we need a drain event, so set that flag.

function writeOrBuffer(stream, state, isBuf, chunk, encoding, cb) {
  if (!isBuf) {
    var newChunk = decodeChunk(state, chunk, encoding);

    if (chunk !== newChunk) {
      isBuf = true;
      encoding = 'buffer';
      chunk = newChunk;
    }
  }

  var len = state.objectMode ? 1 : chunk.length;
  state.length += len;
  var ret = state.length < state.highWaterMark; // we must ensure that previous needDrain will not be reset to false.

  if (!ret) state.needDrain = true;

  if (state.writing || state.corked) {
    var last = state.lastBufferedRequest;
    state.lastBufferedRequest = {
      chunk: chunk,
      encoding: encoding,
      isBuf: isBuf,
      callback: cb,
      next: null
    };

    if (last) {
      last.next = state.lastBufferedRequest;
    } else {
      state.bufferedRequest = state.lastBufferedRequest;
    }

    state.bufferedRequestCount += 1;
  } else {
    doWrite(stream, state, false, len, chunk, encoding, cb);
  }

  return ret;
}

function doWrite(stream, state, writev, len, chunk, encoding, cb) {
  state.writelen = len;
  state.writecb = cb;
  state.writing = true;
  state.sync = true;
  if (state.destroyed) state.onwrite(new ERR_STREAM_DESTROYED('write'));else if (writev) stream._writev(chunk, state.onwrite);else stream._write(chunk, encoding, state.onwrite);
  state.sync = false;
}

function onwriteError(stream, state, sync, er, cb) {
  --state.pendingcb;

  if (sync) {
    // defer the callback if we are being called synchronously
    // to avoid piling up things on the stack
    process.nextTick(cb, er); // this can emit finish, and it will always happen
    // after error

    process.nextTick(finishMaybe, stream, state);
    stream._writableState.errorEmitted = true;
    errorOrDestroy(stream, er);
  } else {
    // the caller expect this to happen before if
    // it is async
    cb(er);
    stream._writableState.errorEmitted = true;
    errorOrDestroy(stream, er); // this can emit finish, but finish must
    // always follow error

    finishMaybe(stream, state);
  }
}

function onwriteStateUpdate(state) {
  state.writing = false;
  state.writecb = null;
  state.length -= state.writelen;
  state.writelen = 0;
}

function onwrite(stream, er) {
  var state = stream._writableState;
  var sync = state.sync;
  var cb = state.writecb;
  if (typeof cb !== 'function') throw new ERR_MULTIPLE_CALLBACK();
  onwriteStateUpdate(state);
  if (er) onwriteError(stream, state, sync, er, cb);else {
    // Check if we're actually ready to finish, but don't emit yet
    var finished = needFinish(state) || stream.destroyed;

    if (!finished && !state.corked && !state.bufferProcessing && state.bufferedRequest) {
      clearBuffer(stream, state);
    }

    if (sync) {
      process.nextTick(afterWrite, stream, state, finished, cb);
    } else {
      afterWrite(stream, state, finished, cb);
    }
  }
}

function afterWrite(stream, state, finished, cb) {
  if (!finished) onwriteDrain(stream, state);
  state.pendingcb--;
  cb();
  finishMaybe(stream, state);
} // Must force callback to be called on nextTick, so that we don't
// emit 'drain' before the write() consumer gets the 'false' return
// value, and has a chance to attach a 'drain' listener.


function onwriteDrain(stream, state) {
  if (state.length === 0 && state.needDrain) {
    state.needDrain = false;
    stream.emit('drain');
  }
} // if there's something in the buffer waiting, then process it


function clearBuffer(stream, state) {
  state.bufferProcessing = true;
  var entry = state.bufferedRequest;

  if (stream._writev && entry && entry.next) {
    // Fast case, write everything using _writev()
    var l = state.bufferedRequestCount;
    var buffer = new Array(l);
    var holder = state.corkedRequestsFree;
    holder.entry = entry;
    var count = 0;
    var allBuffers = true;

    while (entry) {
      buffer[count] = entry;
      if (!entry.isBuf) allBuffers = false;
      entry = entry.next;
      count += 1;
    }

    buffer.allBuffers = allBuffers;
    doWrite(stream, state, true, state.length, buffer, '', holder.finish); // doWrite is almost always async, defer these to save a bit of time
    // as the hot path ends with doWrite

    state.pendingcb++;
    state.lastBufferedRequest = null;

    if (holder.next) {
      state.corkedRequestsFree = holder.next;
      holder.next = null;
    } else {
      state.corkedRequestsFree = new CorkedRequest(state);
    }

    state.bufferedRequestCount = 0;
  } else {
    // Slow case, write chunks one-by-one
    while (entry) {
      var chunk = entry.chunk;
      var encoding = entry.encoding;
      var cb = entry.callback;
      var len = state.objectMode ? 1 : chunk.length;
      doWrite(stream, state, false, len, chunk, encoding, cb);
      entry = entry.next;
      state.bufferedRequestCount--; // if we didn't call the onwrite immediately, then
      // it means that we need to wait until it does.
      // also, that means that the chunk and cb are currently
      // being processed, so move the buffer counter past them.

      if (state.writing) {
        break;
      }
    }

    if (entry === null) state.lastBufferedRequest = null;
  }

  state.bufferedRequest = entry;
  state.bufferProcessing = false;
}

Writable.prototype._write = function (chunk, encoding, cb) {
  cb(new ERR_METHOD_NOT_IMPLEMENTED('_write()'));
};

Writable.prototype._writev = null;

Writable.prototype.end = function (chunk, encoding, cb) {
  var state = this._writableState;

  if (typeof chunk === 'function') {
    cb = chunk;
    chunk = null;
    encoding = null;
  } else if (typeof encoding === 'function') {
    cb = encoding;
    encoding = null;
  }

  if (chunk !== null && chunk !== undefined) this.write(chunk, encoding); // .end() fully uncorks

  if (state.corked) {
    state.corked = 1;
    this.uncork();
  } // ignore unnecessary end() calls.


  if (!state.ending) endWritable(this, state, cb);
  return this;
};

Object.defineProperty(Writable.prototype, 'writableLength', {
  // making it explicit this property is not enumerable
  // because otherwise some prototype manipulation in
  // userland will fail
  enumerable: false,
  get: function get() {
    return this._writableState.length;
  }
});

function needFinish(state) {
  return state.ending && state.length === 0 && state.bufferedRequest === null && !state.finished && !state.writing;
}

function callFinal(stream, state) {
  stream._final(function (err) {
    state.pendingcb--;

    if (err) {
      errorOrDestroy(stream, err);
    }

    state.prefinished = true;
    stream.emit('prefinish');
    finishMaybe(stream, state);
  });
}

function prefinish(stream, state) {
  if (!state.prefinished && !state.finalCalled) {
    if (typeof stream._final === 'function' && !state.destroyed) {
      state.pendingcb++;
      state.finalCalled = true;
      process.nextTick(callFinal, stream, state);
    } else {
      state.prefinished = true;
      stream.emit('prefinish');
    }
  }
}

function finishMaybe(stream, state) {
  var need = needFinish(state);

  if (need) {
    prefinish(stream, state);

    if (state.pendingcb === 0) {
      state.finished = true;
      stream.emit('finish');

      if (state.autoDestroy) {
        // In case of duplex streams we need a way to detect
        // if the readable side is ready for autoDestroy as well
        var rState = stream._readableState;

        if (!rState || rState.autoDestroy && rState.endEmitted) {
          stream.destroy();
        }
      }
    }
  }

  return need;
}

function endWritable(stream, state, cb) {
  state.ending = true;
  finishMaybe(stream, state);

  if (cb) {
    if (state.finished) process.nextTick(cb);else stream.once('finish', cb);
  }

  state.ended = true;
  stream.writable = false;
}

function onCorkedFinish(corkReq, state, err) {
  var entry = corkReq.entry;
  corkReq.entry = null;

  while (entry) {
    var cb = entry.callback;
    state.pendingcb--;
    cb(err);
    entry = entry.next;
  } // reuse the free corkReq.


  state.corkedRequestsFree.next = corkReq;
}

Object.defineProperty(Writable.prototype, 'destroyed', {
  // making it explicit this property is not enumerable
  // because otherwise some prototype manipulation in
  // userland will fail
  enumerable: false,
  get: function get() {
    if (this._writableState === undefined) {
      return false;
    }

    return this._writableState.destroyed;
  },
  set: function set(value) {
    // we ignore the value if the stream
    // has not been initialized yet
    if (!this._writableState) {
      return;
    } // backward compatibility, the user is explicitly
    // managing destroyed


    this._writableState.destroyed = value;
  }
});
Writable.prototype.destroy = destroyImpl.destroy;
Writable.prototype._undestroy = destroyImpl.undestroy;

Writable.prototype._destroy = function (err, cb) {
  cb(err);
};
}).call(this)}).call(this,require('_process'),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{"../errors":55,"./_stream_duplex":56,"./internal/streams/destroy":63,"./internal/streams/state":67,"./internal/streams/stream":68,"_process":50,"buffer":17,"inherits":24,"util-deprecate":78}],61:[function(require,module,exports){
(function (process){(function (){
'use strict';

var _Object$setPrototypeO;

function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }

var finished = require('./end-of-stream');

var kLastResolve = Symbol('lastResolve');
var kLastReject = Symbol('lastReject');
var kError = Symbol('error');
var kEnded = Symbol('ended');
var kLastPromise = Symbol('lastPromise');
var kHandlePromise = Symbol('handlePromise');
var kStream = Symbol('stream');

function createIterResult(value, done) {
  return {
    value: value,
    done: done
  };
}

function readAndResolve(iter) {
  var resolve = iter[kLastResolve];

  if (resolve !== null) {
    var data = iter[kStream].read(); // we defer if data is null
    // we can be expecting either 'end' or
    // 'error'

    if (data !== null) {
      iter[kLastPromise] = null;
      iter[kLastResolve] = null;
      iter[kLastReject] = null;
      resolve(createIterResult(data, false));
    }
  }
}

function onReadable(iter) {
  // we wait for the next tick, because it might
  // emit an error with process.nextTick
  process.nextTick(readAndResolve, iter);
}

function wrapForNext(lastPromise, iter) {
  return function (resolve, reject) {
    lastPromise.then(function () {
      if (iter[kEnded]) {
        resolve(createIterResult(undefined, true));
        return;
      }

      iter[kHandlePromise](resolve, reject);
    }, reject);
  };
}

var AsyncIteratorPrototype = Object.getPrototypeOf(function () {});
var ReadableStreamAsyncIteratorPrototype = Object.setPrototypeOf((_Object$setPrototypeO = {
  get stream() {
    return this[kStream];
  },

  next: function next() {
    var _this = this;

    // if we have detected an error in the meanwhile
    // reject straight away
    var error = this[kError];

    if (error !== null) {
      return Promise.reject(error);
    }

    if (this[kEnded]) {
      return Promise.resolve(createIterResult(undefined, true));
    }

    if (this[kStream].destroyed) {
      // We need to defer via nextTick because if .destroy(err) is
      // called, the error will be emitted via nextTick, and
      // we cannot guarantee that there is no error lingering around
      // waiting to be emitted.
      return new Promise(function (resolve, reject) {
        process.nextTick(function () {
          if (_this[kError]) {
            reject(_this[kError]);
          } else {
            resolve(createIterResult(undefined, true));
          }
        });
      });
    } // if we have multiple next() calls
    // we will wait for the previous Promise to finish
    // this logic is optimized to support for await loops,
    // where next() is only called once at a time


    var lastPromise = this[kLastPromise];
    var promise;

    if (lastPromise) {
      promise = new Promise(wrapForNext(lastPromise, this));
    } else {
      // fast path needed to support multiple this.push()
      // without triggering the next() queue
      var data = this[kStream].read();

      if (data !== null) {
        return Promise.resolve(createIterResult(data, false));
      }

      promise = new Promise(this[kHandlePromise]);
    }

    this[kLastPromise] = promise;
    return promise;
  }
}, _defineProperty(_Object$setPrototypeO, Symbol.asyncIterator, function () {
  return this;
}), _defineProperty(_Object$setPrototypeO, "return", function _return() {
  var _this2 = this;

  // destroy(err, cb) is a private API
  // we can guarantee we have that here, because we control the
  // Readable class this is attached to
  return new Promise(function (resolve, reject) {
    _this2[kStream].destroy(null, function (err) {
      if (err) {
        reject(err);
        return;
      }

      resolve(createIterResult(undefined, true));
    });
  });
}), _Object$setPrototypeO), AsyncIteratorPrototype);

var createReadableStreamAsyncIterator = function createReadableStreamAsyncIterator(stream) {
  var _Object$create;

  var iterator = Object.create(ReadableStreamAsyncIteratorPrototype, (_Object$create = {}, _defineProperty(_Object$create, kStream, {
    value: stream,
    writable: true
  }), _defineProperty(_Object$create, kLastResolve, {
    value: null,
    writable: true
  }), _defineProperty(_Object$create, kLastReject, {
    value: null,
    writable: true
  }), _defineProperty(_Object$create, kError, {
    value: null,
    writable: true
  }), _defineProperty(_Object$create, kEnded, {
    value: stream._readableState.endEmitted,
    writable: true
  }), _defineProperty(_Object$create, kHandlePromise, {
    value: function value(resolve, reject) {
      var data = iterator[kStream].read();

      if (data) {
        iterator[kLastPromise] = null;
        iterator[kLastResolve] = null;
        iterator[kLastReject] = null;
        resolve(createIterResult(data, false));
      } else {
        iterator[kLastResolve] = resolve;
        iterator[kLastReject] = reject;
      }
    },
    writable: true
  }), _Object$create));
  iterator[kLastPromise] = null;
  finished(stream, function (err) {
    if (err && err.code !== 'ERR_STREAM_PREMATURE_CLOSE') {
      var reject = iterator[kLastReject]; // reject if we are waiting for data in the Promise
      // returned by next() and store the error

      if (reject !== null) {
        iterator[kLastPromise] = null;
        iterator[kLastResolve] = null;
        iterator[kLastReject] = null;
        reject(err);
      }

      iterator[kError] = err;
      return;
    }

    var resolve = iterator[kLastResolve];

    if (resolve !== null) {
      iterator[kLastPromise] = null;
      iterator[kLastResolve] = null;
      iterator[kLastReject] = null;
      resolve(createIterResult(undefined, true));
    }

    iterator[kEnded] = true;
  });
  stream.on('readable', onReadable.bind(null, iterator));
  return iterator;
};

module.exports = createReadableStreamAsyncIterator;
}).call(this)}).call(this,require('_process'))
},{"./end-of-stream":64,"_process":50}],62:[function(require,module,exports){
'use strict';

function ownKeys(object, enumerableOnly) { var keys = Object.keys(object); if (Object.getOwnPropertySymbols) { var symbols = Object.getOwnPropertySymbols(object); if (enumerableOnly) symbols = symbols.filter(function (sym) { return Object.getOwnPropertyDescriptor(object, sym).enumerable; }); keys.push.apply(keys, symbols); } return keys; }

function _objectSpread(target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i] != null ? arguments[i] : {}; if (i % 2) { ownKeys(Object(source), true).forEach(function (key) { _defineProperty(target, key, source[key]); }); } else if (Object.getOwnPropertyDescriptors) { Object.defineProperties(target, Object.getOwnPropertyDescriptors(source)); } else { ownKeys(Object(source)).forEach(function (key) { Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key)); }); } } return target; }

function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }

function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }

var _require = require('buffer'),
    Buffer = _require.Buffer;

var _require2 = require('util'),
    inspect = _require2.inspect;

var custom = inspect && inspect.custom || 'inspect';

function copyBuffer(src, target, offset) {
  Buffer.prototype.copy.call(src, target, offset);
}

module.exports =
/*#__PURE__*/
function () {
  function BufferList() {
    _classCallCheck(this, BufferList);

    this.head = null;
    this.tail = null;
    this.length = 0;
  }

  _createClass(BufferList, [{
    key: "push",
    value: function push(v) {
      var entry = {
        data: v,
        next: null
      };
      if (this.length > 0) this.tail.next = entry;else this.head = entry;
      this.tail = entry;
      ++this.length;
    }
  }, {
    key: "unshift",
    value: function unshift(v) {
      var entry = {
        data: v,
        next: this.head
      };
      if (this.length === 0) this.tail = entry;
      this.head = entry;
      ++this.length;
    }
  }, {
    key: "shift",
    value: function shift() {
      if (this.length === 0) return;
      var ret = this.head.data;
      if (this.length === 1) this.head = this.tail = null;else this.head = this.head.next;
      --this.length;
      return ret;
    }
  }, {
    key: "clear",
    value: function clear() {
      this.head = this.tail = null;
      this.length = 0;
    }
  }, {
    key: "join",
    value: function join(s) {
      if (this.length === 0) return '';
      var p = this.head;
      var ret = '' + p.data;

      while (p = p.next) {
        ret += s + p.data;
      }

      return ret;
    }
  }, {
    key: "concat",
    value: function concat(n) {
      if (this.length === 0) return Buffer.alloc(0);
      var ret = Buffer.allocUnsafe(n >>> 0);
      var p = this.head;
      var i = 0;

      while (p) {
        copyBuffer(p.data, ret, i);
        i += p.data.length;
        p = p.next;
      }

      return ret;
    } // Consumes a specified amount of bytes or characters from the buffered data.

  }, {
    key: "consume",
    value: function consume(n, hasStrings) {
      var ret;

      if (n < this.head.data.length) {
        // `slice` is the same for buffers and strings.
        ret = this.head.data.slice(0, n);
        this.head.data = this.head.data.slice(n);
      } else if (n === this.head.data.length) {
        // First chunk is a perfect match.
        ret = this.shift();
      } else {
        // Result spans more than one buffer.
        ret = hasStrings ? this._getString(n) : this._getBuffer(n);
      }

      return ret;
    }
  }, {
    key: "first",
    value: function first() {
      return this.head.data;
    } // Consumes a specified amount of characters from the buffered data.

  }, {
    key: "_getString",
    value: function _getString(n) {
      var p = this.head;
      var c = 1;
      var ret = p.data;
      n -= ret.length;

      while (p = p.next) {
        var str = p.data;
        var nb = n > str.length ? str.length : n;
        if (nb === str.length) ret += str;else ret += str.slice(0, n);
        n -= nb;

        if (n === 0) {
          if (nb === str.length) {
            ++c;
            if (p.next) this.head = p.next;else this.head = this.tail = null;
          } else {
            this.head = p;
            p.data = str.slice(nb);
          }

          break;
        }

        ++c;
      }

      this.length -= c;
      return ret;
    } // Consumes a specified amount of bytes from the buffered data.

  }, {
    key: "_getBuffer",
    value: function _getBuffer(n) {
      var ret = Buffer.allocUnsafe(n);
      var p = this.head;
      var c = 1;
      p.data.copy(ret);
      n -= p.data.length;

      while (p = p.next) {
        var buf = p.data;
        var nb = n > buf.length ? buf.length : n;
        buf.copy(ret, ret.length - n, 0, nb);
        n -= nb;

        if (n === 0) {
          if (nb === buf.length) {
            ++c;
            if (p.next) this.head = p.next;else this.head = this.tail = null;
          } else {
            this.head = p;
            p.data = buf.slice(nb);
          }

          break;
        }

        ++c;
      }

      this.length -= c;
      return ret;
    } // Make sure the linked list only shows the minimal necessary information.

  }, {
    key: custom,
    value: function value(_, options) {
      return inspect(this, _objectSpread({}, options, {
        // Only inspect one level.
        depth: 0,
        // It should not recurse.
        customInspect: false
      }));
    }
  }]);

  return BufferList;
}();
},{"buffer":17,"util":16}],63:[function(require,module,exports){
(function (process){(function (){
'use strict'; // undocumented cb() API, needed for core, not for public API

function destroy(err, cb) {
  var _this = this;

  var readableDestroyed = this._readableState && this._readableState.destroyed;
  var writableDestroyed = this._writableState && this._writableState.destroyed;

  if (readableDestroyed || writableDestroyed) {
    if (cb) {
      cb(err);
    } else if (err) {
      if (!this._writableState) {
        process.nextTick(emitErrorNT, this, err);
      } else if (!this._writableState.errorEmitted) {
        this._writableState.errorEmitted = true;
        process.nextTick(emitErrorNT, this, err);
      }
    }

    return this;
  } // we set destroyed to true before firing error callbacks in order
  // to make it re-entrance safe in case destroy() is called within callbacks


  if (this._readableState) {
    this._readableState.destroyed = true;
  } // if this is a duplex stream mark the writable part as destroyed as well


  if (this._writableState) {
    this._writableState.destroyed = true;
  }

  this._destroy(err || null, function (err) {
    if (!cb && err) {
      if (!_this._writableState) {
        process.nextTick(emitErrorAndCloseNT, _this, err);
      } else if (!_this._writableState.errorEmitted) {
        _this._writableState.errorEmitted = true;
        process.nextTick(emitErrorAndCloseNT, _this, err);
      } else {
        process.nextTick(emitCloseNT, _this);
      }
    } else if (cb) {
      process.nextTick(emitCloseNT, _this);
      cb(err);
    } else {
      process.nextTick(emitCloseNT, _this);
    }
  });

  return this;
}

function emitErrorAndCloseNT(self, err) {
  emitErrorNT(self, err);
  emitCloseNT(self);
}

function emitCloseNT(self) {
  if (self._writableState && !self._writableState.emitClose) return;
  if (self._readableState && !self._readableState.emitClose) return;
  self.emit('close');
}

function undestroy() {
  if (this._readableState) {
    this._readableState.destroyed = false;
    this._readableState.reading = false;
    this._readableState.ended = false;
    this._readableState.endEmitted = false;
  }

  if (this._writableState) {
    this._writableState.destroyed = false;
    this._writableState.ended = false;
    this._writableState.ending = false;
    this._writableState.finalCalled = false;
    this._writableState.prefinished = false;
    this._writableState.finished = false;
    this._writableState.errorEmitted = false;
  }
}

function emitErrorNT(self, err) {
  self.emit('error', err);
}

function errorOrDestroy(stream, err) {
  // We have tests that rely on errors being emitted
  // in the same tick, so changing this is semver major.
  // For now when you opt-in to autoDestroy we allow
  // the error to be emitted nextTick. In a future
  // semver major update we should change the default to this.
  var rState = stream._readableState;
  var wState = stream._writableState;
  if (rState && rState.autoDestroy || wState && wState.autoDestroy) stream.destroy(err);else stream.emit('error', err);
}

module.exports = {
  destroy: destroy,
  undestroy: undestroy,
  errorOrDestroy: errorOrDestroy
};
}).call(this)}).call(this,require('_process'))
},{"_process":50}],64:[function(require,module,exports){
// Ported from https://github.com/mafintosh/end-of-stream with
// permission from the author, Mathias Buus (@mafintosh).
'use strict';

var ERR_STREAM_PREMATURE_CLOSE = require('../../../errors').codes.ERR_STREAM_PREMATURE_CLOSE;

function once(callback) {
  var called = false;
  return function () {
    if (called) return;
    called = true;

    for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {
      args[_key] = arguments[_key];
    }

    callback.apply(this, args);
  };
}

function noop() {}

function isRequest(stream) {
  return stream.setHeader && typeof stream.abort === 'function';
}

function eos(stream, opts, callback) {
  if (typeof opts === 'function') return eos(stream, null, opts);
  if (!opts) opts = {};
  callback = once(callback || noop);
  var readable = opts.readable || opts.readable !== false && stream.readable;
  var writable = opts.writable || opts.writable !== false && stream.writable;

  var onlegacyfinish = function onlegacyfinish() {
    if (!stream.writable) onfinish();
  };

  var writableEnded = stream._writableState && stream._writableState.finished;

  var onfinish = function onfinish() {
    writable = false;
    writableEnded = true;
    if (!readable) callback.call(stream);
  };

  var readableEnded = stream._readableState && stream._readableState.endEmitted;

  var onend = function onend() {
    readable = false;
    readableEnded = true;
    if (!writable) callback.call(stream);
  };

  var onerror = function onerror(err) {
    callback.call(stream, err);
  };

  var onclose = function onclose() {
    var err;

    if (readable && !readableEnded) {
      if (!stream._readableState || !stream._readableState.ended) err = new ERR_STREAM_PREMATURE_CLOSE();
      return callback.call(stream, err);
    }

    if (writable && !writableEnded) {
      if (!stream._writableState || !stream._writableState.ended) err = new ERR_STREAM_PREMATURE_CLOSE();
      return callback.call(stream, err);
    }
  };

  var onrequest = function onrequest() {
    stream.req.on('finish', onfinish);
  };

  if (isRequest(stream)) {
    stream.on('complete', onfinish);
    stream.on('abort', onclose);
    if (stream.req) onrequest();else stream.on('request', onrequest);
  } else if (writable && !stream._writableState) {
    // legacy streams
    stream.on('end', onlegacyfinish);
    stream.on('close', onlegacyfinish);
  }

  stream.on('end', onend);
  stream.on('finish', onfinish);
  if (opts.error !== false) stream.on('error', onerror);
  stream.on('close', onclose);
  return function () {
    stream.removeListener('complete', onfinish);
    stream.removeListener('abort', onclose);
    stream.removeListener('request', onrequest);
    if (stream.req) stream.req.removeListener('finish', onfinish);
    stream.removeListener('end', onlegacyfinish);
    stream.removeListener('close', onlegacyfinish);
    stream.removeListener('finish', onfinish);
    stream.removeListener('end', onend);
    stream.removeListener('error', onerror);
    stream.removeListener('close', onclose);
  };
}

module.exports = eos;
},{"../../../errors":55}],65:[function(require,module,exports){
module.exports = function () {
  throw new Error('Readable.from is not available in the browser')
};

},{}],66:[function(require,module,exports){
// Ported from https://github.com/mafintosh/pump with
// permission from the author, Mathias Buus (@mafintosh).
'use strict';

var eos;

function once(callback) {
  var called = false;
  return function () {
    if (called) return;
    called = true;
    callback.apply(void 0, arguments);
  };
}

var _require$codes = require('../../../errors').codes,
    ERR_MISSING_ARGS = _require$codes.ERR_MISSING_ARGS,
    ERR_STREAM_DESTROYED = _require$codes.ERR_STREAM_DESTROYED;

function noop(err) {
  // Rethrow the error if it exists to avoid swallowing it
  if (err) throw err;
}

function isRequest(stream) {
  return stream.setHeader && typeof stream.abort === 'function';
}

function destroyer(stream, reading, writing, callback) {
  callback = once(callback);
  var closed = false;
  stream.on('close', function () {
    closed = true;
  });
  if (eos === undefined) eos = require('./end-of-stream');
  eos(stream, {
    readable: reading,
    writable: writing
  }, function (err) {
    if (err) return callback(err);
    closed = true;
    callback();
  });
  var destroyed = false;
  return function (err) {
    if (closed) return;
    if (destroyed) return;
    destroyed = true; // request.destroy just do .end - .abort is what we want

    if (isRequest(stream)) return stream.abort();
    if (typeof stream.destroy === 'function') return stream.destroy();
    callback(err || new ERR_STREAM_DESTROYED('pipe'));
  };
}

function call(fn) {
  fn();
}

function pipe(from, to) {
  return from.pipe(to);
}

function popCallback(streams) {
  if (!streams.length) return noop;
  if (typeof streams[streams.length - 1] !== 'function') return noop;
  return streams.pop();
}

function pipeline() {
  for (var _len = arguments.length, streams = new Array(_len), _key = 0; _key < _len; _key++) {
    streams[_key] = arguments[_key];
  }

  var callback = popCallback(streams);
  if (Array.isArray(streams[0])) streams = streams[0];

  if (streams.length < 2) {
    throw new ERR_MISSING_ARGS('streams');
  }

  var error;
  var destroys = streams.map(function (stream, i) {
    var reading = i < streams.length - 1;
    var writing = i > 0;
    return destroyer(stream, reading, writing, function (err) {
      if (!error) error = err;
      if (err) destroys.forEach(call);
      if (reading) return;
      destroys.forEach(call);
      callback(error);
    });
  });
  return streams.reduce(pipe);
}

module.exports = pipeline;
},{"../../../errors":55,"./end-of-stream":64}],67:[function(require,module,exports){
'use strict';

var ERR_INVALID_OPT_VALUE = require('../../../errors').codes.ERR_INVALID_OPT_VALUE;

function highWaterMarkFrom(options, isDuplex, duplexKey) {
  return options.highWaterMark != null ? options.highWaterMark : isDuplex ? options[duplexKey] : null;
}

function getHighWaterMark(state, options, duplexKey, isDuplex) {
  var hwm = highWaterMarkFrom(options, isDuplex, duplexKey);

  if (hwm != null) {
    if (!(isFinite(hwm) && Math.floor(hwm) === hwm) || hwm < 0) {
      var name = isDuplex ? duplexKey : 'highWaterMark';
      throw new ERR_INVALID_OPT_VALUE(name, hwm);
    }

    return Math.floor(hwm);
  } // Default value


  return state.objectMode ? 16 : 16 * 1024;
}

module.exports = {
  getHighWaterMark: getHighWaterMark
};
},{"../../../errors":55}],68:[function(require,module,exports){
module.exports = require('events').EventEmitter;

},{"events":22}],69:[function(require,module,exports){
exports = module.exports = require('./lib/_stream_readable.js');
exports.Stream = exports;
exports.Readable = exports;
exports.Writable = require('./lib/_stream_writable.js');
exports.Duplex = require('./lib/_stream_duplex.js');
exports.Transform = require('./lib/_stream_transform.js');
exports.PassThrough = require('./lib/_stream_passthrough.js');
exports.finished = require('./lib/internal/streams/end-of-stream.js');
exports.pipeline = require('./lib/internal/streams/pipeline.js');

},{"./lib/_stream_duplex.js":56,"./lib/_stream_passthrough.js":57,"./lib/_stream_readable.js":58,"./lib/_stream_transform.js":59,"./lib/_stream_writable.js":60,"./lib/internal/streams/end-of-stream.js":64,"./lib/internal/streams/pipeline.js":66}],70:[function(require,module,exports){
'use strict'

function ReInterval (callback, interval, args) {
  var self = this;

  this._callback = callback;
  this._args = args;

  this._interval = setInterval(callback, interval, this._args);

  this.reschedule = function (interval) {
    // if no interval entered, use the interval passed in on creation
    if (!interval)
      interval = self._interval;

    if (self._interval)
      clearInterval(self._interval);
    self._interval = setInterval(self._callback, interval, self._args);
  };

  this.clear = function () {
    if (self._interval) {
      clearInterval(self._interval);
      self._interval = undefined;
    }
  };
  
  this.destroy = function () {
    if (self._interval) {
      clearInterval(self._interval);
    }
    self._callback = undefined;
    self._interval = undefined;
    self._args = undefined;
  };
}

function reInterval () {
  if (typeof arguments[0] !== 'function')
    throw new Error('callback needed');
  if (typeof arguments[1] !== 'number')
    throw new Error('interval needed');

  var args;

  if (arguments.length > 0) {
    args = new Array(arguments.length - 2);

    for (var i = 0; i < args.length; i++) {
      args[i] = arguments[i + 2];
    }
  }

  return new ReInterval(arguments[0], arguments[1], args);
}

module.exports = reInterval;

},{}],71:[function(require,module,exports){
'use strict'

module.exports = require('./index.js')()

},{"./index.js":72}],72:[function(require,module,exports){
(function (Buffer){(function (){
'use strict'
module.exports = rfdc

function copyBuffer (cur) {
  if (cur instanceof Buffer) {
    return Buffer.from(cur)
  }

  return new cur.constructor(cur.buffer.slice(), cur.byteOffset, cur.length)
}

function rfdc (opts) {
  opts = opts || {}

  if (opts.circles) return rfdcCircles(opts)
  return opts.proto ? cloneProto : clone

  function cloneArray (a, fn) {
    var keys = Object.keys(a)
    var a2 = new Array(keys.length)
    for (var i = 0; i < keys.length; i++) {
      var k = keys[i]
      var cur = a[k]
      if (typeof cur !== 'object' || cur === null) {
        a2[k] = cur
      } else if (cur instanceof Date) {
        a2[k] = new Date(cur)
      } else if (ArrayBuffer.isView(cur)) {
        a2[k] = copyBuffer(cur)
      } else {
        a2[k] = fn(cur)
      }
    }
    return a2
  }

  function clone (o) {
    if (typeof o !== 'object' || o === null) return o
    if (o instanceof Date) return new Date(o)
    if (Array.isArray(o)) return cloneArray(o, clone)
    if (o instanceof Map) return new Map(cloneArray(Array.from(o), clone))
    if (o instanceof Set) return new Set(cloneArray(Array.from(o), clone))
    var o2 = {}
    for (var k in o) {
      if (Object.hasOwnProperty.call(o, k) === false) continue
      var cur = o[k]
      if (typeof cur !== 'object' || cur === null) {
        o2[k] = cur
      } else if (cur instanceof Date) {
        o2[k] = new Date(cur)
      } else if (cur instanceof Map) {
        o2[k] = new Map(cloneArray(Array.from(cur), clone))
      } else if (cur instanceof Set) {
        o2[k] = new Set(cloneArray(Array.from(cur), clone))
      } else if (ArrayBuffer.isView(cur)) {
        o2[k] = copyBuffer(cur)
      } else {
        o2[k] = clone(cur)
      }
    }
    return o2
  }

  function cloneProto (o) {
    if (typeof o !== 'object' || o === null) return o
    if (o instanceof Date) return new Date(o)
    if (Array.isArray(o)) return cloneArray(o, cloneProto)
    if (o instanceof Map) return new Map(cloneArray(Array.from(o), cloneProto))
    if (o instanceof Set) return new Set(cloneArray(Array.from(o), cloneProto))
    var o2 = {}
    for (var k in o) {
      var cur = o[k]
      if (typeof cur !== 'object' || cur === null) {
        o2[k] = cur
      } else if (cur instanceof Date) {
        o2[k] = new Date(cur)
      } else if (cur instanceof Map) {
        o2[k] = new Map(cloneArray(Array.from(cur), cloneProto))
      } else if (cur instanceof Set) {
        o2[k] = new Set(cloneArray(Array.from(cur), cloneProto))
      } else if (ArrayBuffer.isView(cur)) {
        o2[k] = copyBuffer(cur)
      } else {
        o2[k] = cloneProto(cur)
      }
    }
    return o2
  }
}

function rfdcCircles (opts) {
  var refs = []
  var refsNew = []

  return opts.proto ? cloneProto : clone

  function cloneArray (a, fn) {
    var keys = Object.keys(a)
    var a2 = new Array(keys.length)
    for (var i = 0; i < keys.length; i++) {
      var k = keys[i]
      var cur = a[k]
      if (typeof cur !== 'object' || cur === null) {
        a2[k] = cur
      } else if (cur instanceof Date) {
        a2[k] = new Date(cur)
      } else if (ArrayBuffer.isView(cur)) {
        a2[k] = copyBuffer(cur)
      } else {
        var index = refs.indexOf(cur)
        if (index !== -1) {
          a2[k] = refsNew[index]
        } else {
          a2[k] = fn(cur)
        }
      }
    }
    return a2
  }

  function clone (o) {
    if (typeof o !== 'object' || o === null) return o
    if (o instanceof Date) return new Date(o)
    if (Array.isArray(o)) return cloneArray(o, clone)
    if (o instanceof Map) return new Map(cloneArray(Array.from(o), clone))
    if (o instanceof Set) return new Set(cloneArray(Array.from(o), clone))
    var o2 = {}
    refs.push(o)
    refsNew.push(o2)
    for (var k in o) {
      if (Object.hasOwnProperty.call(o, k) === false) continue
      var cur = o[k]
      if (typeof cur !== 'object' || cur === null) {
        o2[k] = cur
      } else if (cur instanceof Date) {
        o2[k] = new Date(cur)
      } else if (cur instanceof Map) {
        o2[k] = new Map(cloneArray(Array.from(cur), clone))
      } else if (cur instanceof Set) {
        o2[k] = new Set(cloneArray(Array.from(cur), clone))
      } else if (ArrayBuffer.isView(cur)) {
        o2[k] = copyBuffer(cur)
      } else {
        var i = refs.indexOf(cur)
        if (i !== -1) {
          o2[k] = refsNew[i]
        } else {
          o2[k] = clone(cur)
        }
      }
    }
    refs.pop()
    refsNew.pop()
    return o2
  }

  function cloneProto (o) {
    if (typeof o !== 'object' || o === null) return o
    if (o instanceof Date) return new Date(o)
    if (Array.isArray(o)) return cloneArray(o, cloneProto)
    if (o instanceof Map) return new Map(cloneArray(Array.from(o), cloneProto))
    if (o instanceof Set) return new Set(cloneArray(Array.from(o), cloneProto))
    var o2 = {}
    refs.push(o)
    refsNew.push(o2)
    for (var k in o) {
      var cur = o[k]
      if (typeof cur !== 'object' || cur === null) {
        o2[k] = cur
      } else if (cur instanceof Date) {
        o2[k] = new Date(cur)
      } else if (cur instanceof Map) {
        o2[k] = new Map(cloneArray(Array.from(cur), cloneProto))
      } else if (cur instanceof Set) {
        o2[k] = new Set(cloneArray(Array.from(cur), cloneProto))
      } else if (ArrayBuffer.isView(cur)) {
        o2[k] = copyBuffer(cur)
      } else {
        var i = refs.indexOf(cur)
        if (i !== -1) {
          o2[k] = refsNew[i]
        } else {
          o2[k] = cloneProto(cur)
        }
      }
    }
    refs.pop()
    refsNew.pop()
    return o2
  }
}

}).call(this)}).call(this,require("buffer").Buffer)
},{"buffer":17}],73:[function(require,module,exports){
/*! safe-buffer. MIT License. Feross Aboukhadijeh <https://feross.org/opensource> */
/* eslint-disable node/no-deprecated-api */
var buffer = require('buffer')
var Buffer = buffer.Buffer

// alternative to using Object.keys for old browsers
function copyProps (src, dst) {
  for (var key in src) {
    dst[key] = src[key]
  }
}
if (Buffer.from && Buffer.alloc && Buffer.allocUnsafe && Buffer.allocUnsafeSlow) {
  module.exports = buffer
} else {
  // Copy properties from require('buffer')
  copyProps(buffer, exports)
  exports.Buffer = SafeBuffer
}

function SafeBuffer (arg, encodingOrOffset, length) {
  return Buffer(arg, encodingOrOffset, length)
}

SafeBuffer.prototype = Object.create(Buffer.prototype)

// Copy static methods from Buffer
copyProps(Buffer, SafeBuffer)

SafeBuffer.from = function (arg, encodingOrOffset, length) {
  if (typeof arg === 'number') {
    throw new TypeError('Argument must not be a number')
  }
  return Buffer(arg, encodingOrOffset, length)
}

SafeBuffer.alloc = function (size, fill, encoding) {
  if (typeof size !== 'number') {
    throw new TypeError('Argument must be a number')
  }
  var buf = Buffer(size)
  if (fill !== undefined) {
    if (typeof encoding === 'string') {
      buf.fill(fill, encoding)
    } else {
      buf.fill(fill)
    }
  } else {
    buf.fill(0)
  }
  return buf
}

SafeBuffer.allocUnsafe = function (size) {
  if (typeof size !== 'number') {
    throw new TypeError('Argument must be a number')
  }
  return Buffer(size)
}

SafeBuffer.allocUnsafeSlow = function (size) {
  if (typeof size !== 'number') {
    throw new TypeError('Argument must be a number')
  }
  return buffer.SlowBuffer(size)
}

},{"buffer":17}],74:[function(require,module,exports){
module.exports = shift

function shift (stream) {
  var rs = stream._readableState
  if (!rs) return null
  return (rs.objectMode || typeof stream._duplexState === 'number') ? stream.read() : stream.read(getStateLength(rs))
}

function getStateLength (state) {
  if (state.buffer.length) {
    // Since node 6.3.0 state.buffer is a BufferList not an array
    if (state.buffer.head) {
      return state.buffer.head.data.length
    }

    return state.buffer[0].length
  }

  return state.length
}

},{}],75:[function(require,module,exports){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

'use strict';

/*<replacement>*/

var Buffer = require('safe-buffer').Buffer;
/*</replacement>*/

var isEncoding = Buffer.isEncoding || function (encoding) {
  encoding = '' + encoding;
  switch (encoding && encoding.toLowerCase()) {
    case 'hex':case 'utf8':case 'utf-8':case 'ascii':case 'binary':case 'base64':case 'ucs2':case 'ucs-2':case 'utf16le':case 'utf-16le':case 'raw':
      return true;
    default:
      return false;
  }
};

function _normalizeEncoding(enc) {
  if (!enc) return 'utf8';
  var retried;
  while (true) {
    switch (enc) {
      case 'utf8':
      case 'utf-8':
        return 'utf8';
      case 'ucs2':
      case 'ucs-2':
      case 'utf16le':
      case 'utf-16le':
        return 'utf16le';
      case 'latin1':
      case 'binary':
        return 'latin1';
      case 'base64':
      case 'ascii':
      case 'hex':
        return enc;
      default:
        if (retried) return; // undefined
        enc = ('' + enc).toLowerCase();
        retried = true;
    }
  }
};

// Do not cache `Buffer.isEncoding` when checking encoding names as some
// modules monkey-patch it to support additional encodings
function normalizeEncoding(enc) {
  var nenc = _normalizeEncoding(enc);
  if (typeof nenc !== 'string' && (Buffer.isEncoding === isEncoding || !isEncoding(enc))) throw new Error('Unknown encoding: ' + enc);
  return nenc || enc;
}

// StringDecoder provides an interface for efficiently splitting a series of
// buffers into a series of JS strings without breaking apart multi-byte
// characters.
exports.StringDecoder = StringDecoder;
function StringDecoder(encoding) {
  this.encoding = normalizeEncoding(encoding);
  var nb;
  switch (this.encoding) {
    case 'utf16le':
      this.text = utf16Text;
      this.end = utf16End;
      nb = 4;
      break;
    case 'utf8':
      this.fillLast = utf8FillLast;
      nb = 4;
      break;
    case 'base64':
      this.text = base64Text;
      this.end = base64End;
      nb = 3;
      break;
    default:
      this.write = simpleWrite;
      this.end = simpleEnd;
      return;
  }
  this.lastNeed = 0;
  this.lastTotal = 0;
  this.lastChar = Buffer.allocUnsafe(nb);
}

StringDecoder.prototype.write = function (buf) {
  if (buf.length === 0) return '';
  var r;
  var i;
  if (this.lastNeed) {
    r = this.fillLast(buf);
    if (r === undefined) return '';
    i = this.lastNeed;
    this.lastNeed = 0;
  } else {
    i = 0;
  }
  if (i < buf.length) return r ? r + this.text(buf, i) : this.text(buf, i);
  return r || '';
};

StringDecoder.prototype.end = utf8End;

// Returns only complete characters in a Buffer
StringDecoder.prototype.text = utf8Text;

// Attempts to complete a partial non-UTF-8 character using bytes from a Buffer
StringDecoder.prototype.fillLast = function (buf) {
  if (this.lastNeed <= buf.length) {
    buf.copy(this.lastChar, this.lastTotal - this.lastNeed, 0, this.lastNeed);
    return this.lastChar.toString(this.encoding, 0, this.lastTotal);
  }
  buf.copy(this.lastChar, this.lastTotal - this.lastNeed, 0, buf.length);
  this.lastNeed -= buf.length;
};

// Checks the type of a UTF-8 byte, whether it's ASCII, a leading byte, or a
// continuation byte. If an invalid byte is detected, -2 is returned.
function utf8CheckByte(byte) {
  if (byte <= 0x7F) return 0;else if (byte >> 5 === 0x06) return 2;else if (byte >> 4 === 0x0E) return 3;else if (byte >> 3 === 0x1E) return 4;
  return byte >> 6 === 0x02 ? -1 : -2;
}

// Checks at most 3 bytes at the end of a Buffer in order to detect an
// incomplete multi-byte UTF-8 character. The total number of bytes (2, 3, or 4)
// needed to complete the UTF-8 character (if applicable) are returned.
function utf8CheckIncomplete(self, buf, i) {
  var j = buf.length - 1;
  if (j < i) return 0;
  var nb = utf8CheckByte(buf[j]);
  if (nb >= 0) {
    if (nb > 0) self.lastNeed = nb - 1;
    return nb;
  }
  if (--j < i || nb === -2) return 0;
  nb = utf8CheckByte(buf[j]);
  if (nb >= 0) {
    if (nb > 0) self.lastNeed = nb - 2;
    return nb;
  }
  if (--j < i || nb === -2) return 0;
  nb = utf8CheckByte(buf[j]);
  if (nb >= 0) {
    if (nb > 0) {
      if (nb === 2) nb = 0;else self.lastNeed = nb - 3;
    }
    return nb;
  }
  return 0;
}

// Validates as many continuation bytes for a multi-byte UTF-8 character as
// needed or are available. If we see a non-continuation byte where we expect
// one, we "replace" the validated continuation bytes we've seen so far with
// a single UTF-8 replacement character ('\ufffd'), to match v8's UTF-8 decoding
// behavior. The continuation byte check is included three times in the case
// where all of the continuation bytes for a character exist in the same buffer.
// It is also done this way as a slight performance increase instead of using a
// loop.
function utf8CheckExtraBytes(self, buf, p) {
  if ((buf[0] & 0xC0) !== 0x80) {
    self.lastNeed = 0;
    return '\ufffd';
  }
  if (self.lastNeed > 1 && buf.length > 1) {
    if ((buf[1] & 0xC0) !== 0x80) {
      self.lastNeed = 1;
      return '\ufffd';
    }
    if (self.lastNeed > 2 && buf.length > 2) {
      if ((buf[2] & 0xC0) !== 0x80) {
        self.lastNeed = 2;
        return '\ufffd';
      }
    }
  }
}

// Attempts to complete a multi-byte UTF-8 character using bytes from a Buffer.
function utf8FillLast(buf) {
  var p = this.lastTotal - this.lastNeed;
  var r = utf8CheckExtraBytes(this, buf, p);
  if (r !== undefined) return r;
  if (this.lastNeed <= buf.length) {
    buf.copy(this.lastChar, p, 0, this.lastNeed);
    return this.lastChar.toString(this.encoding, 0, this.lastTotal);
  }
  buf.copy(this.lastChar, p, 0, buf.length);
  this.lastNeed -= buf.length;
}

// Returns all complete UTF-8 characters in a Buffer. If the Buffer ended on a
// partial character, the character's bytes are buffered until the required
// number of bytes are available.
function utf8Text(buf, i) {
  var total = utf8CheckIncomplete(this, buf, i);
  if (!this.lastNeed) return buf.toString('utf8', i);
  this.lastTotal = total;
  var end = buf.length - (total - this.lastNeed);
  buf.copy(this.lastChar, 0, end);
  return buf.toString('utf8', i, end);
}

// For UTF-8, a replacement character is added when ending on a partial
// character.
function utf8End(buf) {
  var r = buf && buf.length ? this.write(buf) : '';
  if (this.lastNeed) return r + '\ufffd';
  return r;
}

// UTF-16LE typically needs two bytes per character, but even if we have an even
// number of bytes available, we need to check if we end on a leading/high
// surrogate. In that case, we need to wait for the next two bytes in order to
// decode the last character properly.
function utf16Text(buf, i) {
  if ((buf.length - i) % 2 === 0) {
    var r = buf.toString('utf16le', i);
    if (r) {
      var c = r.charCodeAt(r.length - 1);
      if (c >= 0xD800 && c <= 0xDBFF) {
        this.lastNeed = 2;
        this.lastTotal = 4;
        this.lastChar[0] = buf[buf.length - 2];
        this.lastChar[1] = buf[buf.length - 1];
        return r.slice(0, -1);
      }
    }
    return r;
  }
  this.lastNeed = 1;
  this.lastTotal = 2;
  this.lastChar[0] = buf[buf.length - 1];
  return buf.toString('utf16le', i, buf.length - 1);
}

// For UTF-16LE we do not explicitly append special replacement characters if we
// end on a partial character, we simply let v8 handle that.
function utf16End(buf) {
  var r = buf && buf.length ? this.write(buf) : '';
  if (this.lastNeed) {
    var end = this.lastTotal - this.lastNeed;
    return r + this.lastChar.toString('utf16le', 0, end);
  }
  return r;
}

function base64Text(buf, i) {
  var n = (buf.length - i) % 3;
  if (n === 0) return buf.toString('base64', i);
  this.lastNeed = 3 - n;
  this.lastTotal = 3;
  if (n === 1) {
    this.lastChar[0] = buf[buf.length - 1];
  } else {
    this.lastChar[0] = buf[buf.length - 2];
    this.lastChar[1] = buf[buf.length - 1];
  }
  return buf.toString('base64', i, buf.length - n);
}

function base64End(buf) {
  var r = buf && buf.length ? this.write(buf) : '';
  if (this.lastNeed) return r + this.lastChar.toString('base64', 0, 3 - this.lastNeed);
  return r;
}

// Pass bytes on through for single-byte encodings (e.g. ascii, latin1, hex)
function simpleWrite(buf) {
  return buf.toString(this.encoding);
}

function simpleEnd(buf) {
  return buf && buf.length ? this.write(buf) : '';
}
},{"safe-buffer":73}],76:[function(require,module,exports){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

'use strict';

var punycode = require('punycode');
var util = require('./util');

exports.parse = urlParse;
exports.resolve = urlResolve;
exports.resolveObject = urlResolveObject;
exports.format = urlFormat;

exports.Url = Url;

function Url() {
  this.protocol = null;
  this.slashes = null;
  this.auth = null;
  this.host = null;
  this.port = null;
  this.hostname = null;
  this.hash = null;
  this.search = null;
  this.query = null;
  this.pathname = null;
  this.path = null;
  this.href = null;
}

// Reference: RFC 3986, RFC 1808, RFC 2396

// define these here so at least they only have to be
// compiled once on the first module load.
var protocolPattern = /^([a-z0-9.+-]+:)/i,
    portPattern = /:[0-9]*$/,

    // Special case for a simple path URL
    simplePathPattern = /^(\/\/?(?!\/)[^\?\s]*)(\?[^\s]*)?$/,

    // RFC 2396: characters reserved for delimiting URLs.
    // We actually just auto-escape these.
    delims = ['<', '>', '"', '`', ' ', '\r', '\n', '\t'],

    // RFC 2396: characters not allowed for various reasons.
    unwise = ['{', '}', '|', '\\', '^', '`'].concat(delims),

    // Allowed by RFCs, but cause of XSS attacks.  Always escape these.
    autoEscape = ['\''].concat(unwise),
    // Characters that are never ever allowed in a hostname.
    // Note that any invalid chars are also handled, but these
    // are the ones that are *expected* to be seen, so we fast-path
    // them.
    nonHostChars = ['%', '/', '?', ';', '#'].concat(autoEscape),
    hostEndingChars = ['/', '?', '#'],
    hostnameMaxLen = 255,
    hostnamePartPattern = /^[+a-z0-9A-Z_-]{0,63}$/,
    hostnamePartStart = /^([+a-z0-9A-Z_-]{0,63})(.*)$/,
    // protocols that can allow "unsafe" and "unwise" chars.
    unsafeProtocol = {
      'javascript': true,
      'javascript:': true
    },
    // protocols that never have a hostname.
    hostlessProtocol = {
      'javascript': true,
      'javascript:': true
    },
    // protocols that always contain a // bit.
    slashedProtocol = {
      'http': true,
      'https': true,
      'ftp': true,
      'gopher': true,
      'file': true,
      'http:': true,
      'https:': true,
      'ftp:': true,
      'gopher:': true,
      'file:': true
    },
    querystring = require('querystring');

function urlParse(url, parseQueryString, slashesDenoteHost) {
  if (url && util.isObject(url) && url instanceof Url) return url;

  var u = new Url;
  u.parse(url, parseQueryString, slashesDenoteHost);
  return u;
}

Url.prototype.parse = function(url, parseQueryString, slashesDenoteHost) {
  if (!util.isString(url)) {
    throw new TypeError("Parameter 'url' must be a string, not " + typeof url);
  }

  // Copy chrome, IE, opera backslash-handling behavior.
  // Back slashes before the query string get converted to forward slashes
  // See: https://code.google.com/p/chromium/issues/detail?id=25916
  var queryIndex = url.indexOf('?'),
      splitter =
          (queryIndex !== -1 && queryIndex < url.indexOf('#')) ? '?' : '#',
      uSplit = url.split(splitter),
      slashRegex = /\\/g;
  uSplit[0] = uSplit[0].replace(slashRegex, '/');
  url = uSplit.join(splitter);

  var rest = url;

  // trim before proceeding.
  // This is to support parse stuff like "  http://foo.com  \n"
  rest = rest.trim();

  if (!slashesDenoteHost && url.split('#').length === 1) {
    // Try fast path regexp
    var simplePath = simplePathPattern.exec(rest);
    if (simplePath) {
      this.path = rest;
      this.href = rest;
      this.pathname = simplePath[1];
      if (simplePath[2]) {
        this.search = simplePath[2];
        if (parseQueryString) {
          this.query = querystring.parse(this.search.substr(1));
        } else {
          this.query = this.search.substr(1);
        }
      } else if (parseQueryString) {
        this.search = '';
        this.query = {};
      }
      return this;
    }
  }

  var proto = protocolPattern.exec(rest);
  if (proto) {
    proto = proto[0];
    var lowerProto = proto.toLowerCase();
    this.protocol = lowerProto;
    rest = rest.substr(proto.length);
  }

  // figure out if it's got a host
  // user@server is *always* interpreted as a hostname, and url
  // resolution will treat //foo/bar as host=foo,path=bar because that's
  // how the browser resolves relative URLs.
  if (slashesDenoteHost || proto || rest.match(/^\/\/[^@\/]+@[^@\/]+/)) {
    var slashes = rest.substr(0, 2) === '//';
    if (slashes && !(proto && hostlessProtocol[proto])) {
      rest = rest.substr(2);
      this.slashes = true;
    }
  }

  if (!hostlessProtocol[proto] &&
      (slashes || (proto && !slashedProtocol[proto]))) {

    // there's a hostname.
    // the first instance of /, ?, ;, or # ends the host.
    //
    // If there is an @ in the hostname, then non-host chars *are* allowed
    // to the left of the last @ sign, unless some host-ending character
    // comes *before* the @-sign.
    // URLs are obnoxious.
    //
    // ex:
    // http://a@b@c/ => user:a@b host:c
    // http://a@b?@c => user:a host:c path:/?@c

    // v0.12 TODO(isaacs): This is not quite how Chrome does things.
    // Review our test case against browsers more comprehensively.

    // find the first instance of any hostEndingChars
    var hostEnd = -1;
    for (var i = 0; i < hostEndingChars.length; i++) {
      var hec = rest.indexOf(hostEndingChars[i]);
      if (hec !== -1 && (hostEnd === -1 || hec < hostEnd))
        hostEnd = hec;
    }

    // at this point, either we have an explicit point where the
    // auth portion cannot go past, or the last @ char is the decider.
    var auth, atSign;
    if (hostEnd === -1) {
      // atSign can be anywhere.
      atSign = rest.lastIndexOf('@');
    } else {
      // atSign must be in auth portion.
      // http://a@b/c@d => host:b auth:a path:/c@d
      atSign = rest.lastIndexOf('@', hostEnd);
    }

    // Now we have a portion which is definitely the auth.
    // Pull that off.
    if (atSign !== -1) {
      auth = rest.slice(0, atSign);
      rest = rest.slice(atSign + 1);
      this.auth = decodeURIComponent(auth);
    }

    // the host is the remaining to the left of the first non-host char
    hostEnd = -1;
    for (var i = 0; i < nonHostChars.length; i++) {
      var hec = rest.indexOf(nonHostChars[i]);
      if (hec !== -1 && (hostEnd === -1 || hec < hostEnd))
        hostEnd = hec;
    }
    // if we still have not hit it, then the entire thing is a host.
    if (hostEnd === -1)
      hostEnd = rest.length;

    this.host = rest.slice(0, hostEnd);
    rest = rest.slice(hostEnd);

    // pull out port.
    this.parseHost();

    // we've indicated that there is a hostname,
    // so even if it's empty, it has to be present.
    this.hostname = this.hostname || '';

    // if hostname begins with [ and ends with ]
    // assume that it's an IPv6 address.
    var ipv6Hostname = this.hostname[0] === '[' &&
        this.hostname[this.hostname.length - 1] === ']';

    // validate a little.
    if (!ipv6Hostname) {
      var hostparts = this.hostname.split(/\./);
      for (var i = 0, l = hostparts.length; i < l; i++) {
        var part = hostparts[i];
        if (!part) continue;
        if (!part.match(hostnamePartPattern)) {
          var newpart = '';
          for (var j = 0, k = part.length; j < k; j++) {
            if (part.charCodeAt(j) > 127) {
              // we replace non-ASCII char with a temporary placeholder
              // we need this to make sure size of hostname is not
              // broken by replacing non-ASCII by nothing
              newpart += 'x';
            } else {
              newpart += part[j];
            }
          }
          // we test again with ASCII char only
          if (!newpart.match(hostnamePartPattern)) {
            var validParts = hostparts.slice(0, i);
            var notHost = hostparts.slice(i + 1);
            var bit = part.match(hostnamePartStart);
            if (bit) {
              validParts.push(bit[1]);
              notHost.unshift(bit[2]);
            }
            if (notHost.length) {
              rest = '/' + notHost.join('.') + rest;
            }
            this.hostname = validParts.join('.');
            break;
          }
        }
      }
    }

    if (this.hostname.length > hostnameMaxLen) {
      this.hostname = '';
    } else {
      // hostnames are always lower case.
      this.hostname = this.hostname.toLowerCase();
    }

    if (!ipv6Hostname) {
      // IDNA Support: Returns a punycoded representation of "domain".
      // It only converts parts of the domain name that
      // have non-ASCII characters, i.e. it doesn't matter if
      // you call it with a domain that already is ASCII-only.
      this.hostname = punycode.toASCII(this.hostname);
    }

    var p = this.port ? ':' + this.port : '';
    var h = this.hostname || '';
    this.host = h + p;
    this.href += this.host;

    // strip [ and ] from the hostname
    // the host field still retains them, though
    if (ipv6Hostname) {
      this.hostname = this.hostname.substr(1, this.hostname.length - 2);
      if (rest[0] !== '/') {
        rest = '/' + rest;
      }
    }
  }

  // now rest is set to the post-host stuff.
  // chop off any delim chars.
  if (!unsafeProtocol[lowerProto]) {

    // First, make 100% sure that any "autoEscape" chars get
    // escaped, even if encodeURIComponent doesn't think they
    // need to be.
    for (var i = 0, l = autoEscape.length; i < l; i++) {
      var ae = autoEscape[i];
      if (rest.indexOf(ae) === -1)
        continue;
      var esc = encodeURIComponent(ae);
      if (esc === ae) {
        esc = escape(ae);
      }
      rest = rest.split(ae).join(esc);
    }
  }


  // chop off from the tail first.
  var hash = rest.indexOf('#');
  if (hash !== -1) {
    // got a fragment string.
    this.hash = rest.substr(hash);
    rest = rest.slice(0, hash);
  }
  var qm = rest.indexOf('?');
  if (qm !== -1) {
    this.search = rest.substr(qm);
    this.query = rest.substr(qm + 1);
    if (parseQueryString) {
      this.query = querystring.parse(this.query);
    }
    rest = rest.slice(0, qm);
  } else if (parseQueryString) {
    // no query string, but parseQueryString still requested
    this.search = '';
    this.query = {};
  }
  if (rest) this.pathname = rest;
  if (slashedProtocol[lowerProto] &&
      this.hostname && !this.pathname) {
    this.pathname = '/';
  }

  //to support http.request
  if (this.pathname || this.search) {
    var p = this.pathname || '';
    var s = this.search || '';
    this.path = p + s;
  }

  // finally, reconstruct the href based on what has been validated.
  this.href = this.format();
  return this;
};

// format a parsed object into a url string
function urlFormat(obj) {
  // ensure it's an object, and not a string url.
  // If it's an obj, this is a no-op.
  // this way, you can call url_format() on strings
  // to clean up potentially wonky urls.
  if (util.isString(obj)) obj = urlParse(obj);
  if (!(obj instanceof Url)) return Url.prototype.format.call(obj);
  return obj.format();
}

Url.prototype.format = function() {
  var auth = this.auth || '';
  if (auth) {
    auth = encodeURIComponent(auth);
    auth = auth.replace(/%3A/i, ':');
    auth += '@';
  }

  var protocol = this.protocol || '',
      pathname = this.pathname || '',
      hash = this.hash || '',
      host = false,
      query = '';

  if (this.host) {
    host = auth + this.host;
  } else if (this.hostname) {
    host = auth + (this.hostname.indexOf(':') === -1 ?
        this.hostname :
        '[' + this.hostname + ']');
    if (this.port) {
      host += ':' + this.port;
    }
  }

  if (this.query &&
      util.isObject(this.query) &&
      Object.keys(this.query).length) {
    query = querystring.stringify(this.query);
  }

  var search = this.search || (query && ('?' + query)) || '';

  if (protocol && protocol.substr(-1) !== ':') protocol += ':';

  // only the slashedProtocols get the //.  Not mailto:, xmpp:, etc.
  // unless they had them to begin with.
  if (this.slashes ||
      (!protocol || slashedProtocol[protocol]) && host !== false) {
    host = '//' + (host || '');
    if (pathname && pathname.charAt(0) !== '/') pathname = '/' + pathname;
  } else if (!host) {
    host = '';
  }

  if (hash && hash.charAt(0) !== '#') hash = '#' + hash;
  if (search && search.charAt(0) !== '?') search = '?' + search;

  pathname = pathname.replace(/[?#]/g, function(match) {
    return encodeURIComponent(match);
  });
  search = search.replace('#', '%23');

  return protocol + host + pathname + search + hash;
};

function urlResolve(source, relative) {
  return urlParse(source, false, true).resolve(relative);
}

Url.prototype.resolve = function(relative) {
  return this.resolveObject(urlParse(relative, false, true)).format();
};

function urlResolveObject(source, relative) {
  if (!source) return relative;
  return urlParse(source, false, true).resolveObject(relative);
}

Url.prototype.resolveObject = function(relative) {
  if (util.isString(relative)) {
    var rel = new Url();
    rel.parse(relative, false, true);
    relative = rel;
  }

  var result = new Url();
  var tkeys = Object.keys(this);
  for (var tk = 0; tk < tkeys.length; tk++) {
    var tkey = tkeys[tk];
    result[tkey] = this[tkey];
  }

  // hash is always overridden, no matter what.
  // even href="" will remove it.
  result.hash = relative.hash;

  // if the relative url is empty, then there's nothing left to do here.
  if (relative.href === '') {
    result.href = result.format();
    return result;
  }

  // hrefs like //foo/bar always cut to the protocol.
  if (relative.slashes && !relative.protocol) {
    // take everything except the protocol from relative
    var rkeys = Object.keys(relative);
    for (var rk = 0; rk < rkeys.length; rk++) {
      var rkey = rkeys[rk];
      if (rkey !== 'protocol')
        result[rkey] = relative[rkey];
    }

    //urlParse appends trailing / to urls like http://www.example.com
    if (slashedProtocol[result.protocol] &&
        result.hostname && !result.pathname) {
      result.path = result.pathname = '/';
    }

    result.href = result.format();
    return result;
  }

  if (relative.protocol && relative.protocol !== result.protocol) {
    // if it's a known url protocol, then changing
    // the protocol does weird things
    // first, if it's not file:, then we MUST have a host,
    // and if there was a path
    // to begin with, then we MUST have a path.
    // if it is file:, then the host is dropped,
    // because that's known to be hostless.
    // anything else is assumed to be absolute.
    if (!slashedProtocol[relative.protocol]) {
      var keys = Object.keys(relative);
      for (var v = 0; v < keys.length; v++) {
        var k = keys[v];
        result[k] = relative[k];
      }
      result.href = result.format();
      return result;
    }

    result.protocol = relative.protocol;
    if (!relative.host && !hostlessProtocol[relative.protocol]) {
      var relPath = (relative.pathname || '').split('/');
      while (relPath.length && !(relative.host = relPath.shift()));
      if (!relative.host) relative.host = '';
      if (!relative.hostname) relative.hostname = '';
      if (relPath[0] !== '') relPath.unshift('');
      if (relPath.length < 2) relPath.unshift('');
      result.pathname = relPath.join('/');
    } else {
      result.pathname = relative.pathname;
    }
    result.search = relative.search;
    result.query = relative.query;
    result.host = relative.host || '';
    result.auth = relative.auth;
    result.hostname = relative.hostname || relative.host;
    result.port = relative.port;
    // to support http.request
    if (result.pathname || result.search) {
      var p = result.pathname || '';
      var s = result.search || '';
      result.path = p + s;
    }
    result.slashes = result.slashes || relative.slashes;
    result.href = result.format();
    return result;
  }

  var isSourceAbs = (result.pathname && result.pathname.charAt(0) === '/'),
      isRelAbs = (
          relative.host ||
          relative.pathname && relative.pathname.charAt(0) === '/'
      ),
      mustEndAbs = (isRelAbs || isSourceAbs ||
                    (result.host && relative.pathname)),
      removeAllDots = mustEndAbs,
      srcPath = result.pathname && result.pathname.split('/') || [],
      relPath = relative.pathname && relative.pathname.split('/') || [],
      psychotic = result.protocol && !slashedProtocol[result.protocol];

  // if the url is a non-slashed url, then relative
  // links like ../.. should be able
  // to crawl up to the hostname, as well.  This is strange.
  // result.protocol has already been set by now.
  // Later on, put the first path part into the host field.
  if (psychotic) {
    result.hostname = '';
    result.port = null;
    if (result.host) {
      if (srcPath[0] === '') srcPath[0] = result.host;
      else srcPath.unshift(result.host);
    }
    result.host = '';
    if (relative.protocol) {
      relative.hostname = null;
      relative.port = null;
      if (relative.host) {
        if (relPath[0] === '') relPath[0] = relative.host;
        else relPath.unshift(relative.host);
      }
      relative.host = null;
    }
    mustEndAbs = mustEndAbs && (relPath[0] === '' || srcPath[0] === '');
  }

  if (isRelAbs) {
    // it's absolute.
    result.host = (relative.host || relative.host === '') ?
                  relative.host : result.host;
    result.hostname = (relative.hostname || relative.hostname === '') ?
                      relative.hostname : result.hostname;
    result.search = relative.search;
    result.query = relative.query;
    srcPath = relPath;
    // fall through to the dot-handling below.
  } else if (relPath.length) {
    // it's relative
    // throw away the existing file, and take the new path instead.
    if (!srcPath) srcPath = [];
    srcPath.pop();
    srcPath = srcPath.concat(relPath);
    result.search = relative.search;
    result.query = relative.query;
  } else if (!util.isNullOrUndefined(relative.search)) {
    // just pull out the search.
    // like href='?foo'.
    // Put this after the other two cases because it simplifies the booleans
    if (psychotic) {
      result.hostname = result.host = srcPath.shift();
      //occationaly the auth can get stuck only in host
      //this especially happens in cases like
      //url.resolveObject('mailto:local1@domain1', 'local2@domain2')
      var authInHost = result.host && result.host.indexOf('@') > 0 ?
                       result.host.split('@') : false;
      if (authInHost) {
        result.auth = authInHost.shift();
        result.host = result.hostname = authInHost.shift();
      }
    }
    result.search = relative.search;
    result.query = relative.query;
    //to support http.request
    if (!util.isNull(result.pathname) || !util.isNull(result.search)) {
      result.path = (result.pathname ? result.pathname : '') +
                    (result.search ? result.search : '');
    }
    result.href = result.format();
    return result;
  }

  if (!srcPath.length) {
    // no path at all.  easy.
    // we've already handled the other stuff above.
    result.pathname = null;
    //to support http.request
    if (result.search) {
      result.path = '/' + result.search;
    } else {
      result.path = null;
    }
    result.href = result.format();
    return result;
  }

  // if a url ENDs in . or .., then it must get a trailing slash.
  // however, if it ends in anything else non-slashy,
  // then it must NOT get a trailing slash.
  var last = srcPath.slice(-1)[0];
  var hasTrailingSlash = (
      (result.host || relative.host || srcPath.length > 1) &&
      (last === '.' || last === '..') || last === '');

  // strip single dots, resolve double dots to parent dir
  // if the path tries to go above the root, `up` ends up > 0
  var up = 0;
  for (var i = srcPath.length; i >= 0; i--) {
    last = srcPath[i];
    if (last === '.') {
      srcPath.splice(i, 1);
    } else if (last === '..') {
      srcPath.splice(i, 1);
      up++;
    } else if (up) {
      srcPath.splice(i, 1);
      up--;
    }
  }

  // if the path is allowed to go above the root, restore leading ..s
  if (!mustEndAbs && !removeAllDots) {
    for (; up--; up) {
      srcPath.unshift('..');
    }
  }

  if (mustEndAbs && srcPath[0] !== '' &&
      (!srcPath[0] || srcPath[0].charAt(0) !== '/')) {
    srcPath.unshift('');
  }

  if (hasTrailingSlash && (srcPath.join('/').substr(-1) !== '/')) {
    srcPath.push('');
  }

  var isAbsolute = srcPath[0] === '' ||
      (srcPath[0] && srcPath[0].charAt(0) === '/');

  // put the host back
  if (psychotic) {
    result.hostname = result.host = isAbsolute ? '' :
                                    srcPath.length ? srcPath.shift() : '';
    //occationaly the auth can get stuck only in host
    //this especially happens in cases like
    //url.resolveObject('mailto:local1@domain1', 'local2@domain2')
    var authInHost = result.host && result.host.indexOf('@') > 0 ?
                     result.host.split('@') : false;
    if (authInHost) {
      result.auth = authInHost.shift();
      result.host = result.hostname = authInHost.shift();
    }
  }

  mustEndAbs = mustEndAbs || (result.host && srcPath.length);

  if (mustEndAbs && !isAbsolute) {
    srcPath.unshift('');
  }

  if (!srcPath.length) {
    result.pathname = null;
    result.path = null;
  } else {
    result.pathname = srcPath.join('/');
  }

  //to support request.http
  if (!util.isNull(result.pathname) || !util.isNull(result.search)) {
    result.path = (result.pathname ? result.pathname : '') +
                  (result.search ? result.search : '');
  }
  result.auth = relative.auth || result.auth;
  result.slashes = result.slashes || relative.slashes;
  result.href = result.format();
  return result;
};

Url.prototype.parseHost = function() {
  var host = this.host;
  var port = portPattern.exec(host);
  if (port) {
    port = port[0];
    if (port !== ':') {
      this.port = port.substr(1);
    }
    host = host.substr(0, host.length - port.length);
  }
  if (host) this.hostname = host;
};

},{"./util":77,"punycode":51,"querystring":54}],77:[function(require,module,exports){
'use strict';

module.exports = {
  isString: function(arg) {
    return typeof(arg) === 'string';
  },
  isObject: function(arg) {
    return typeof(arg) === 'object' && arg !== null;
  },
  isNull: function(arg) {
    return arg === null;
  },
  isNullOrUndefined: function(arg) {
    return arg == null;
  }
};

},{}],78:[function(require,module,exports){
(function (global){(function (){

/**
 * Module exports.
 */

module.exports = deprecate;

/**
 * Mark that a method should not be used.
 * Returns a modified function which warns once by default.
 *
 * If `localStorage.noDeprecation = true` is set, then it is a no-op.
 *
 * If `localStorage.throwDeprecation = true` is set, then deprecated functions
 * will throw an Error when invoked.
 *
 * If `localStorage.traceDeprecation = true` is set, then deprecated functions
 * will invoke `console.trace()` instead of `console.error()`.
 *
 * @param {Function} fn - the function to deprecate
 * @param {String} msg - the string to print to the console when `fn` is invoked
 * @returns {Function} a new "deprecated" version of `fn`
 * @api public
 */

function deprecate (fn, msg) {
  if (config('noDeprecation')) {
    return fn;
  }

  var warned = false;
  function deprecated() {
    if (!warned) {
      if (config('throwDeprecation')) {
        throw new Error(msg);
      } else if (config('traceDeprecation')) {
        console.trace(msg);
      } else {
        console.warn(msg);
      }
      warned = true;
    }
    return fn.apply(this, arguments);
  }

  return deprecated;
}

/**
 * Checks `localStorage` for boolean values for the given `name`.
 *
 * @param {String} name
 * @returns {Boolean}
 * @api private
 */

function config (name) {
  // accessing global.localStorage can trigger a DOMException in sandboxed iframes
  try {
    if (!global.localStorage) return false;
  } catch (_) {
    return false;
  }
  var val = global.localStorage[name];
  if (null == val) return false;
  return String(val).toLowerCase() === 'true';
}

}).call(this)}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{}],79:[function(require,module,exports){
// Returns a wrapper function that returns a wrapped callback
// The wrapper function should do some stuff, and return a
// presumably different callback function.
// This makes sure that own properties are retained, so that
// decorations and such are not lost along the way.
module.exports = wrappy
function wrappy (fn, cb) {
  if (fn && cb) return wrappy(fn)(cb)

  if (typeof fn !== 'function')
    throw new TypeError('need wrapper function')

  Object.keys(fn).forEach(function (k) {
    wrapper[k] = fn[k]
  })

  return wrapper

  function wrapper() {
    var args = new Array(arguments.length)
    for (var i = 0; i < args.length; i++) {
      args[i] = arguments[i]
    }
    var ret = fn.apply(this, args)
    var cb = args[args.length-1]
    if (typeof ret === 'function' && ret !== cb) {
      Object.keys(cb).forEach(function (k) {
        ret[k] = cb[k]
      })
    }
    return ret
  }
}

},{}],80:[function(require,module,exports){
'use strict';

module.exports = function () {
  throw new Error(
    'ws does not work in the browser. Browser clients must use the native ' +
      'WebSocket object'
  );
};

},{}],81:[function(require,module,exports){
module.exports = extend

var hasOwnProperty = Object.prototype.hasOwnProperty;

function extend() {
    var target = {}

    for (var i = 0; i < arguments.length; i++) {
        var source = arguments[i]

        for (var key in source) {
            if (hasOwnProperty.call(source, key)) {
                target[key] = source[key]
            }
        }
    }

    return target
}

},{}],82:[function(require,module,exports){
'use strict'
module.exports = function (Yallist) {
  Yallist.prototype[Symbol.iterator] = function* () {
    for (let walker = this.head; walker; walker = walker.next) {
      yield walker.value
    }
  }
}

},{}],83:[function(require,module,exports){
'use strict'
module.exports = Yallist

Yallist.Node = Node
Yallist.create = Yallist

function Yallist (list) {
  var self = this
  if (!(self instanceof Yallist)) {
    self = new Yallist()
  }

  self.tail = null
  self.head = null
  self.length = 0

  if (list && typeof list.forEach === 'function') {
    list.forEach(function (item) {
      self.push(item)
    })
  } else if (arguments.length > 0) {
    for (var i = 0, l = arguments.length; i < l; i++) {
      self.push(arguments[i])
    }
  }

  return self
}

Yallist.prototype.removeNode = function (node) {
  if (node.list !== this) {
    throw new Error('removing node which does not belong to this list')
  }

  var next = node.next
  var prev = node.prev

  if (next) {
    next.prev = prev
  }

  if (prev) {
    prev.next = next
  }

  if (node === this.head) {
    this.head = next
  }
  if (node === this.tail) {
    this.tail = prev
  }

  node.list.length--
  node.next = null
  node.prev = null
  node.list = null

  return next
}

Yallist.prototype.unshiftNode = function (node) {
  if (node === this.head) {
    return
  }

  if (node.list) {
    node.list.removeNode(node)
  }

  var head = this.head
  node.list = this
  node.next = head
  if (head) {
    head.prev = node
  }

  this.head = node
  if (!this.tail) {
    this.tail = node
  }
  this.length++
}

Yallist.prototype.pushNode = function (node) {
  if (node === this.tail) {
    return
  }

  if (node.list) {
    node.list.removeNode(node)
  }

  var tail = this.tail
  node.list = this
  node.prev = tail
  if (tail) {
    tail.next = node
  }

  this.tail = node
  if (!this.head) {
    this.head = node
  }
  this.length++
}

Yallist.prototype.push = function () {
  for (var i = 0, l = arguments.length; i < l; i++) {
    push(this, arguments[i])
  }
  return this.length
}

Yallist.prototype.unshift = function () {
  for (var i = 0, l = arguments.length; i < l; i++) {
    unshift(this, arguments[i])
  }
  return this.length
}

Yallist.prototype.pop = function () {
  if (!this.tail) {
    return undefined
  }

  var res = this.tail.value
  this.tail = this.tail.prev
  if (this.tail) {
    this.tail.next = null
  } else {
    this.head = null
  }
  this.length--
  return res
}

Yallist.prototype.shift = function () {
  if (!this.head) {
    return undefined
  }

  var res = this.head.value
  this.head = this.head.next
  if (this.head) {
    this.head.prev = null
  } else {
    this.tail = null
  }
  this.length--
  return res
}

Yallist.prototype.forEach = function (fn, thisp) {
  thisp = thisp || this
  for (var walker = this.head, i = 0; walker !== null; i++) {
    fn.call(thisp, walker.value, i, this)
    walker = walker.next
  }
}

Yallist.prototype.forEachReverse = function (fn, thisp) {
  thisp = thisp || this
  for (var walker = this.tail, i = this.length - 1; walker !== null; i--) {
    fn.call(thisp, walker.value, i, this)
    walker = walker.prev
  }
}

Yallist.prototype.get = function (n) {
  for (var i = 0, walker = this.head; walker !== null && i < n; i++) {
    // abort out of the list early if we hit a cycle
    walker = walker.next
  }
  if (i === n && walker !== null) {
    return walker.value
  }
}

Yallist.prototype.getReverse = function (n) {
  for (var i = 0, walker = this.tail; walker !== null && i < n; i++) {
    // abort out of the list early if we hit a cycle
    walker = walker.prev
  }
  if (i === n && walker !== null) {
    return walker.value
  }
}

Yallist.prototype.map = function (fn, thisp) {
  thisp = thisp || this
  var res = new Yallist()
  for (var walker = this.head; walker !== null;) {
    res.push(fn.call(thisp, walker.value, this))
    walker = walker.next
  }
  return res
}

Yallist.prototype.mapReverse = function (fn, thisp) {
  thisp = thisp || this
  var res = new Yallist()
  for (var walker = this.tail; walker !== null;) {
    res.push(fn.call(thisp, walker.value, this))
    walker = walker.prev
  }
  return res
}

Yallist.prototype.reduce = function (fn, initial) {
  var acc
  var walker = this.head
  if (arguments.length > 1) {
    acc = initial
  } else if (this.head) {
    walker = this.head.next
    acc = this.head.value
  } else {
    throw new TypeError('Reduce of empty list with no initial value')
  }

  for (var i = 0; walker !== null; i++) {
    acc = fn(acc, walker.value, i)
    walker = walker.next
  }

  return acc
}

Yallist.prototype.reduceReverse = function (fn, initial) {
  var acc
  var walker = this.tail
  if (arguments.length > 1) {
    acc = initial
  } else if (this.tail) {
    walker = this.tail.prev
    acc = this.tail.value
  } else {
    throw new TypeError('Reduce of empty list with no initial value')
  }

  for (var i = this.length - 1; walker !== null; i--) {
    acc = fn(acc, walker.value, i)
    walker = walker.prev
  }

  return acc
}

Yallist.prototype.toArray = function () {
  var arr = new Array(this.length)
  for (var i = 0, walker = this.head; walker !== null; i++) {
    arr[i] = walker.value
    walker = walker.next
  }
  return arr
}

Yallist.prototype.toArrayReverse = function () {
  var arr = new Array(this.length)
  for (var i = 0, walker = this.tail; walker !== null; i++) {
    arr[i] = walker.value
    walker = walker.prev
  }
  return arr
}

Yallist.prototype.slice = function (from, to) {
  to = to || this.length
  if (to < 0) {
    to += this.length
  }
  from = from || 0
  if (from < 0) {
    from += this.length
  }
  var ret = new Yallist()
  if (to < from || to < 0) {
    return ret
  }
  if (from < 0) {
    from = 0
  }
  if (to > this.length) {
    to = this.length
  }
  for (var i = 0, walker = this.head; walker !== null && i < from; i++) {
    walker = walker.next
  }
  for (; walker !== null && i < to; i++, walker = walker.next) {
    ret.push(walker.value)
  }
  return ret
}

Yallist.prototype.sliceReverse = function (from, to) {
  to = to || this.length
  if (to < 0) {
    to += this.length
  }
  from = from || 0
  if (from < 0) {
    from += this.length
  }
  var ret = new Yallist()
  if (to < from || to < 0) {
    return ret
  }
  if (from < 0) {
    from = 0
  }
  if (to > this.length) {
    to = this.length
  }
  for (var i = this.length, walker = this.tail; walker !== null && i > to; i--) {
    walker = walker.prev
  }
  for (; walker !== null && i > from; i--, walker = walker.prev) {
    ret.push(walker.value)
  }
  return ret
}

Yallist.prototype.splice = function (start, deleteCount, ...nodes) {
  if (start > this.length) {
    start = this.length - 1
  }
  if (start < 0) {
    start = this.length + start;
  }

  for (var i = 0, walker = this.head; walker !== null && i < start; i++) {
    walker = walker.next
  }

  var ret = []
  for (var i = 0; walker && i < deleteCount; i++) {
    ret.push(walker.value)
    walker = this.removeNode(walker)
  }
  if (walker === null) {
    walker = this.tail
  }

  if (walker !== this.head && walker !== this.tail) {
    walker = walker.prev
  }

  for (var i = 0; i < nodes.length; i++) {
    walker = insert(this, walker, nodes[i])
  }
  return ret;
}

Yallist.prototype.reverse = function () {
  var head = this.head
  var tail = this.tail
  for (var walker = head; walker !== null; walker = walker.prev) {
    var p = walker.prev
    walker.prev = walker.next
    walker.next = p
  }
  this.head = tail
  this.tail = head
  return this
}

function insert (self, node, value) {
  var inserted = node === self.head ?
    new Node(value, null, node, self) :
    new Node(value, node, node.next, self)

  if (inserted.next === null) {
    self.tail = inserted
  }
  if (inserted.prev === null) {
    self.head = inserted
  }

  self.length++

  return inserted
}

function push (self, item) {
  self.tail = new Node(item, self.tail, null, self)
  if (!self.head) {
    self.head = self.tail
  }
  self.length++
}

function unshift (self, item) {
  self.head = new Node(item, null, self.head, self)
  if (!self.tail) {
    self.tail = self.head
  }
  self.length++
}

function Node (value, prev, next, list) {
  if (!(this instanceof Node)) {
    return new Node(value, prev, next, list)
  }

  this.list = list
  this.value = value

  if (prev) {
    prev.next = this
    this.prev = prev
  } else {
    this.prev = null
  }

  if (next) {
    next.prev = this
    this.next = next
  } else {
    this.next = null
  }
}

try {
  // add if support for Symbol.iterator is present
  require('./iterator.js')(Yallist)
} catch (er) {}

},{"./iterator.js":82}]},{},[12])(12)
});