mqtt

public/mqtt/dist/mqtt.js

@@ -0,0 +1,16833 @@
+(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
+ */
+var events = require('events')
+var Store = require('./store')
+var eos = require('end-of-stream')
+var mqttPacket = require('mqtt-packet')
+var Writable = require('readable-stream').Writable
+var inherits = require('inherits')
+var reInterval = require('reinterval')
+var validations = require('./validations')
+var xtend = require('xtend')
+var setImmediate = global.setImmediate || function (callback) {
+  // works in node v0.8
+  process.nextTick(callback)
+}
+var defaultConnectOptions = {
+  keepalive: 60,
+  reschedulePings: true,
+  protocolId: 'MQTT',
+  protocolVersion: 4,
+  reconnectPeriod: 1000,
+  connectTimeout: 30 * 1000,
+  clean: true,
+  resubscribe: true
+}
+
+function defaultId () {
+  return 'mqttjs_' + Math.random().toString(16).substr(2, 8)
+}
+
+function sendPacket (client, packet, cb) {
+  client.emit('packetsend', packet)
+
+  var result = mqttPacket.writeToStream(packet, client.stream)
+
+  if (!result && cb) {
+    client.stream.once('drain', cb)
+  } else if (cb) {
+    cb()
+  }
+}
+
+function flush (queue) {
+  if (queue) {
+    Object.keys(queue).forEach(function (messageId) {
+      if (typeof queue[messageId] === 'function') {
+        queue[messageId](new Error('Connection closed'))
+        delete queue[messageId]
+      }
+    })
+  }
+}
+
+function storeAndSend (client, packet, cb) {
+  client.outgoingStore.put(packet, function storedPacket (err) {
+    if (err) {
+      return cb && cb(err)
+    }
+    sendPacket(client, packet, cb)
+  })
+}
+
+function nop () {}
+
+/**
+ * MqttClient constructor
+ *
+ * @param {Stream} stream - stream
+ * @param {Object} [options] - connection options
+ * (see Connection#connect)
+ */
+function MqttClient (streamBuilder, options) {
+  var k
+  var 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]
+    }
+  }
+
+  this.options.clientId = (typeof this.options.clientId === 'string') ? this.options.clientId : defaultId()
+
+  this.streamBuilder = streamBuilder
+
+  // Inflight message storages
+  this.outgoingStore = this.options.outgoingStore || new Store()
+  this.incomingStore = this.options.incomingStore || new Store()
+
+  // Should QoS zero messages be queued when the connection is broken?
+  this.queueQoSZero = this.options.queueQoSZero === undefined ? true : this.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
+  /**
+   * 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))
+
+  // Inflight callbacks
+  this.outgoing = {}
+
+  // Mark connected on connect
+  this.on('connect', function () {
+    if (this.disconnected) {
+      return
+    }
+
+    this.connected = true
+    var outStore = this.outgoingStore.createStream()
+
+    this.once('close', remove)
+    outStore.on('end', function () {
+      that.removeListener('close', remove)
+    })
+    outStore.on('error', function (err) {
+      that.removeListener('close', remove)
+      that.emit('error', err)
+    })
+
+    function remove () {
+      outStore.destroy()
+      outStore = null
+    }
+
+    function storeDeliver () {
+      // edge case, we wrapped this twice
+      if (!outStore) {
+        return
+      }
+
+      var packet = outStore.read(1)
+      var cb
+
+      if (!packet) {
+        // read when data is available in the future
+        outStore.once('readable', storeDeliver)
+        return
+      }
+
+      // Avoid unnecessary stream read operations when disconnected
+      if (!that.disconnecting && !that.reconnectTimer) {
+        cb = that.outgoing[packet.messageId]
+        that.outgoing[packet.messageId] = function (err, status) {
+          // Ensure that the original callback passed in to publish gets invoked
+          if (cb) {
+            cb(err, status)
+          }
+
+          storeDeliver()
+        }
+        that._sendPacket(packet)
+      } else if (outStore.destroy) {
+        outStore.destroy()
+      }
+    }
+
+    // start flowing
+    storeDeliver()
+  })
+
+  // Mark disconnected on stream close
+  this.on('close', function () {
+    this.connected = false
+    clearTimeout(this.connackTimer)
+  })
+
+  // Setup ping timer
+  this.on('connect', this._setupPingTimer)
+
+  // Send queued packets
+  this.on('connect', function () {
+    var queue = this.queue
+
+    function deliver () {
+      var entry = queue.shift()
+      var packet = null
+
+      if (!entry) {
+        return
+      }
+
+      packet = entry.packet
+
+      that._sendPacket(
+        packet,
+        function (err) {
+          if (entry.cb) {
+            entry.cb(err)
+          }
+          deliver()
+        }
+      )
+    }
+
+    deliver()
+  })
+
+  var firstConnection = true
+  // resubscribe
+  this.on('connect', function () {
+    if (!firstConnection &&
+        this.options.clean &&
+        Object.keys(this._resubscribeTopics).length > 0) {
+      if (this.options.resubscribe) {
+        this._resubscribeTopics.resubscribe = true
+        this.subscribe(this._resubscribeTopics)
+      } else {
+        this._resubscribeTopics = {}
+      }
+    }
+
+    firstConnection = false
+  })
+
+  // Clear ping timer
+  this.on('close', function () {
+    if (that.pingTimer !== null) {
+      that.pingTimer.clear()
+      that.pingTimer = null
+    }
+  })
+
+  // Setup reconnect timer on disconnect
+  this.on('close', this._setupReconnect)
+
+  events.EventEmitter.call(this)
+
+  this._setupStream()
+}
+inherits(MqttClient, events.EventEmitter)
+
+/**
+ * setup the event handlers in the inner stream.
+ *
+ * @api private
+ */
+MqttClient.prototype._setupStream = function () {
+  var connectPacket
+  var that = this
+  var writable = new Writable()
+  var parser = mqttPacket.parser(this.options)
+  var completeParse = null
+  var packets = []
+
+  this._clearReconnect()
+
+  this.stream = this.streamBuilder(this)
+
+  parser.on('packet', function (packet) {
+    packets.push(packet)
+  })
+
+  function nextTickWork () {
+    process.nextTick(work)
+  }
+
+  function work () {
+    var packet = packets.shift()
+    var done = completeParse
+
+    if (packet) {
+      that._handlePacket(packet, nextTickWork)
+    } else {
+      completeParse = null
+      done()
+    }
+  }
+
+  writable._write = function (buf, enc, done) {
+    completeParse = done
+    parser.parse(buf)
+    work()
+  }
+
+  this.stream.pipe(writable)
+
+  // Suppress connection errors
+  this.stream.on('error', nop)
+
+  // Echo stream close
+  eos(this.stream, this.emit.bind(this, 'close'))
+
+  // Send a connect packet
+  connectPacket = Object.create(this.options)
+  connectPacket.cmd = 'connect'
+  // avoid message queue
+  sendPacket(this, connectPacket)
+
+  // Echo connection errors
+  parser.on('error', this.emit.bind(this, 'error'))
+
+  // 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 () {
+    that._cleanUp(true)
+  }, this.options.connectTimeout)
+}
+
+MqttClient.prototype._handlePacket = function (packet, done) {
+  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 'pingresp':
+      this._handlePingresp(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(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
+ * @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) {
+  var packet
+
+  // .publish(topic, payload, cb);
+  if (typeof opts === 'function') {
+    callback = opts
+    opts = null
+  }
+
+  // default opts
+  var defaultOpts = {qos: 0, retain: false, dup: false}
+  opts = xtend(defaultOpts, opts)
+
+  if (this._checkDisconnecting(callback)) {
+    return this
+  }
+
+  packet = {
+    cmd: 'publish',
+    topic: topic,
+    payload: message,
+    qos: opts.qos,
+    retain: opts.retain,
+    messageId: this._nextId(),
+    dup: opts.dup
+  }
+
+  switch (opts.qos) {
+    case 1:
+    case 2:
+
+      // Add to callbacks
+      this.outgoing[packet.messageId] = callback || nop
+      this._sendPacket(packet)
+      break
+    default:
+      this._sendPacket(packet, callback)
+      break
+  }
+
+  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': 0, 'topic2': 1}, console.log);
+ * @example client.subscribe('topic', console.log);
+ */
+MqttClient.prototype.subscribe = function () {
+  var packet
+  var args = Array.prototype.slice.call(arguments)
+  var subs = []
+  var obj = args.shift()
+  var resubscribe = obj.resubscribe
+  var callback = args.pop() || nop
+  var opts = args.pop()
+  var invalidTopic
+  var that = this
+
+  delete obj.resubscribe
+
+  if (typeof obj === 'string') {
+    obj = [obj]
+  }
+
+  if (typeof callback !== 'function') {
+    opts = callback
+    callback = nop
+  }
+
+  invalidTopic = validations.validateTopics(obj)
+  if (invalidTopic !== null) {
+    setImmediate(callback, new Error('Invalid topic ' + invalidTopic))
+    return this
+  }
+
+  if (this._checkDisconnecting(callback)) {
+    return this
+  }
+
+  var defaultOpts = { qos: 0 }
+  opts = xtend(defaultOpts, opts)
+
+  if (Array.isArray(obj)) {
+    obj.forEach(function (topic) {
+      if (that._resubscribeTopics[topic] < opts.qos ||
+          !that._resubscribeTopics.hasOwnProperty(topic) ||
+          resubscribe) {
+        subs.push({
+          topic: topic,
+          qos: opts.qos
+        })
+      }
+    })
+  } else {
+    Object
+      .keys(obj)
+      .forEach(function (k) {
+        if (that._resubscribeTopics[k] < obj[k] ||
+            !that._resubscribeTopics.hasOwnProperty(k) ||
+            resubscribe) {
+          subs.push({
+            topic: k,
+            qos: obj[k]
+          })
+        }
+      })
+  }
+
+  packet = {
+    cmd: 'subscribe',
+    subscriptions: subs,
+    qos: 1,
+    retain: false,
+    dup: false,
+    messageId: this._nextId()
+  }
+
+  if (!subs.length) {
+    callback(null, [])
+    return
+  }
+
+  // subscriptions to resubscribe to in case of disconnect
+  if (this.options.resubscribe) {
+    var topics = []
+    subs.forEach(function (sub) {
+      if (that.options.reconnectPeriod > 0) {
+        that._resubscribeTopics[sub.topic] = sub.qos
+        topics.push(sub.topic)
+      }
+    })
+    that.messageIdToTopic[packet.messageId] = topics
+  }
+
+  this.outgoing[packet.messageId] = function (err, packet) {
+    if (!err) {
+      var granted = packet.granted
+      for (var i = 0; i < granted.length; i += 1) {
+        subs[i].qos = granted[i]
+      }
+    }
+
+    callback(err, subs)
+  }
+
+  this._sendPacket(packet)
+
+  return this
+}
+
+/**
+ * unsubscribe - unsubscribe from topic(s)
+ *
+ * @param {String, Array} topic - topics to unsubscribe from
+ * @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 (topic, callback) {
+  var packet = {
+    cmd: 'unsubscribe',
+    qos: 1,
+    messageId: this._nextId()
+  }
+  var that = this
+
+  callback = callback || nop
+
+  if (this._checkDisconnecting(callback)) {
+    return this
+  }
+
+  if (typeof topic === 'string') {
+    packet.unsubscriptions = [topic]
+  } else if (typeof topic === 'object' && topic.length) {
+    packet.unsubscriptions = topic
+  }
+
+  if (this.options.resubscribe) {
+    packet.unsubscriptions.forEach(function (topic) {
+      delete that._resubscribeTopics[topic]
+    })
+  }
+
+  this.outgoing[packet.messageId] = callback
+
+  this._sendPacket(packet)
+
+  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 {Function} cb - called when the client has been closed
+ *
+ * @api public
+ */
+MqttClient.prototype.end = function (force, cb) {
+  var that = this
+
+  if (typeof force === 'function') {
+    cb = force
+    force = false
+  }
+
+  function closeStores () {
+    that.disconnected = true
+    that.incomingStore.close(function () {
+      that.outgoingStore.close(function () {
+        if (cb) {
+          cb.apply(null, arguments)
+        }
+        that.emit('end')
+      })
+    })
+    if (that._deferredReconnect) {
+      that._deferredReconnect()
+    }
+  }
+
+  function finish () {
+    // defer closesStores of an I/O cycle,
+    // just to make sure things are
+    // ok for websockets
+    that._cleanUp(force, setImmediate.bind(null, closeStores))
+  }
+
+  if (this.disconnecting) {
+    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
+    this.once('outgoingEmpty', setTimeout.bind(null, finish, 10))
+  } else {
+    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} mid - messageId to remove message
+ * @returns {MqttClient} this - for chaining
+ * @api public
+ *
+ * @example client.removeOutgoingMessage(client.getLastMessageId());
+ */
+MqttClient.prototype.removeOutgoingMessage = function (mid) {
+  var cb = this.outgoing[mid]
+  delete this.outgoing[mid]
+  this.outgoingStore.del({messageId: mid}, 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) {
+  var that = this
+  var 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 () {
+  this.emit('reconnect')
+  this._setupStream()
+}
+
+/**
+ * _setupReconnect - setup reconnect timer
+ */
+MqttClient.prototype._setupReconnect = function () {
+  var that = this
+
+  if (!that.disconnecting && !that.reconnectTimer && (that.options.reconnectPeriod > 0)) {
+    if (!this.reconnecting) {
+      this.emit('offline')
+      this.reconnecting = true
+    }
+    that.reconnectTimer = setInterval(function () {
+      that._reconnect()
+    }, that.options.reconnectPeriod)
+  }
+}
+
+/**
+ * _clearReconnect - clear the reconnect timer
+ */
+MqttClient.prototype._clearReconnect = function () {
+  if (this.reconnectTimer) {
+    clearInterval(this.reconnectTimer)
+    this.reconnectTimer = null
+  }
+}
+
+/**
+ * _cleanUp - clean up on connection end
+ * @api private
+ */
+MqttClient.prototype._cleanUp = function (forced, done) {
+  if (done) {
+    this.stream.on('close', done)
+  }
+
+  if (forced) {
+    if ((this.options.reconnectPeriod === 0) && this.options.clean) {
+      flush(this.outgoing)
+    }
+    this.stream.destroy()
+  } else {
+    this._sendPacket(
+      { cmd: 'disconnect' },
+      setImmediate.bind(
+        null,
+        this.stream.end.bind(this.stream)
+      )
+    )
+  }
+
+  if (!this.disconnecting) {
+    this._clearReconnect()
+    this._setupReconnect()
+  }
+
+  if (this.pingTimer !== null) {
+    this.pingTimer.clear()
+    this.pingTimer = null
+  }
+
+  if (done && !this.connected) {
+    this.stream.removeListener('close', done)
+    done()
+  }
+}
+
+/**
+ * _sendPacket - send or queue a packet
+ * @param {String} type - packet type (see `protocol`)
+ * @param {Object} packet - packet options
+ * @param {Function} cb - callback when the packet is sent
+ * @api private
+ */
+MqttClient.prototype._sendPacket = function (packet, cb) {
+  if (!this.connected) {
+    if (((packet.qos || 0) === 0 && this.queueQoSZero) || packet.cmd !== 'publish') {
+      this.queue.push({ packet: packet, cb: cb })
+    } else if (packet.qos > 0) {
+      cb = this.outgoing[packet.messageId]
+      this.outgoingStore.put(packet, function (err) {
+        if (err) {
+          return cb && cb(err)
+        }
+      })
+    } else if (cb) {
+      cb(new Error('No connection to broker'))
+    }
+
+    return
+  }
+
+  // When sending a packet, reschedule the ping timer
+  this._shiftPingInterval()
+
+  switch (packet.cmd) {
+    case 'publish':
+      break
+    case 'pubrel':
+      storeAndSend(this, packet, cb)
+      return
+    default:
+      sendPacket(this, packet, cb)
+      return
+  }
+
+  switch (packet.qos) {
+    case 2:
+    case 1:
+      storeAndSend(this, packet, cb)
+      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
+  }
+}
+
+/**
+ * _setupPingTimer - setup the ping timer
+ *
+ * @api private
+ */
+MqttClient.prototype._setupPingTimer = function () {
+  var 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 () {
+  if (this.pingResp) {
+    this.pingResp = false
+    this._sendPacket({ cmd: 'pingreq' })
+  } else {
+    // do a forced cleanup since socket will be in bad shape
+    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) {
+  var rc = packet.returnCode
+  var errors = [
+    '',
+    'Unacceptable protocol version',
+    'Identifier rejected',
+    'Server unavailable',
+    'Bad username or password',
+    'Not authorized'
+  ]
+
+  clearTimeout(this.connackTimer)
+
+  if (rc === 0) {
+    this.reconnecting = false
+    this.emit('connect', packet)
+  } else if (rc > 0) {
+    var err = new Error('Connection refused: ' + errors[rc])
+    err.code = rc
+    this.emit('error', err)
+  }
+}
+
+/**
+ * _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: mid
+    });
+  }
+  // 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) {
+  done = typeof done !== 'undefined' ? done : nop
+  var topic = packet.topic.toString()
+  var message = packet.payload
+  var qos = packet.qos
+  var mid = packet.messageId
+  var that = this
+
+  switch (qos) {
+    case 2:
+      this.incomingStore.put(packet, function (err) {
+        if (err) {
+          return done(err)
+        }
+        that._sendPacket({cmd: 'pubrec', messageId: mid}, done)
+      })
+      break
+    case 1:
+      // emit the message event
+      this.emit('message', topic, message, packet)
+      this.handleMessage(packet, function (err) {
+        if (err) {
+          return done(err)
+        }
+        // send 'puback' if the above 'handleMessage' method executed
+        // successfully.
+        that._sendPacket({cmd: 'puback', messageId: mid}, done)
+      })
+      break
+    case 0:
+      // emit the message event
+      this.emit('message', topic, message, packet)
+      this.handleMessage(packet, done)
+      break
+    default:
+      // do 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" */
+  var mid = packet.messageId
+  var type = packet.cmd
+  var response = null
+  var cb = this.outgoing[mid]
+  var that = this
+
+  if (!cb) {
+    // Server sent an ack in error, ignore it.
+    return
+  }
+
+  // Process
+  switch (type) {
+    case 'pubcomp':
+      // same thing as puback for QoS 2
+    case 'puback':
+      // Callback - we're done
+      delete this.outgoing[mid]
+      this.outgoingStore.del(packet, cb)
+      break
+    case 'pubrec':
+      response = {
+        cmd: 'pubrel',
+        qos: 2,
+        messageId: mid
+      }
+
+      this._sendPacket(response)
+      break
+    case 'suback':
+      delete this.outgoing[mid]
+      if (packet.granted.length === 1 && (packet.granted[0] & 0x80) !== 0) {
+        // suback with Failure status
+        var topics = this.messageIdToTopic[mid]
+        if (topics) {
+          topics.forEach(function (topic) {
+            delete that._resubscribeTopics[topic]
+          })
+        }
+      }
+      cb(null, packet)
+      break
+    case 'unsuback':
+      delete this.outgoing[mid]
+      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) {
+  callback = typeof callback !== 'undefined' ? callback : nop
+  var mid = packet.messageId
+  var that = this
+
+  var comp = {cmd: 'pubcomp', messageId: mid}
+
+  that.incomingStore.get(packet, function (err, pub) {
+    if (!err && pub.cmd !== 'pubrel') {
+      that.emit('message', pub.topic, pub.payload, pub)
+      that.incomingStore.put(packet, function (err) {
+        if (err) {
+          return callback(err)
+        }
+        that.handleMessage(pub, function (err) {
+          if (err) {
+            return callback(err)
+          }
+          that._sendPacket(comp, callback)
+        })
+      })
+    } else {
+      that._sendPacket(comp, callback)
+    }
+  })
+}
+
+/**
+ * _nextId
+ * @return unsigned int
+ */
+MqttClient.prototype._nextId = function () {
+  // id becomes current state of this.nextId and increments afterwards
+  var id = this.nextId++
+  // Ensure 16 bit unsigned int (max 65535, nextId got one higher)
+  if (this.nextId === 65536) {
+    this.nextId = 1
+  }
+  return id
+}
+
+/**
+ * getLastMessageId
+ * @return unsigned int
+ */
+MqttClient.prototype.getLastMessageId = function () {
+  return (this.nextId === 1) ? 65535 : (this.nextId - 1)
+}
+
+module.exports = MqttClient
+
+}).call(this)}).call(this,require('_process'),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
+},{"./store":6,"./validations":7,"_process":96,"end-of-stream":16,"events":79,"inherits":84,"mqtt-packet":89,"readable-stream":112,"reinterval":113,"xtend":165}],2:[function(require,module,exports){
+'use strict'
+var net = require('net')
+
+/*
+  variables port and host can be removed since
+  you have all required information in opts object
+*/
+function buildBuilder (client, opts) {
+  var port, host
+  opts.port = opts.port || 1883
+  opts.hostname = opts.hostname || opts.host || 'localhost'
+
+  port = opts.port
+  host = opts.hostname
+
+  return net.createConnection(port, host)
+}
+
+module.exports = buildBuilder
+
+},{"net":11}],3:[function(require,module,exports){
+'use strict'
+var tls = require('tls')
+
+function buildBuilder (mqttClient, opts) {
+  var connection
+  opts.port = opts.port || 8883
+  opts.host = opts.hostname || opts.host || 'localhost'
+
+  opts.rejectUnauthorized = opts.rejectUnauthorized !== false
+
+  delete opts.path
+
+  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
+
+},{"tls":11}],4:[function(require,module,exports){
+(function (process){(function (){
+'use strict'
+
+var websocket = require('websocket-stream')
+var urlModule = require('url')
+var WSS_OPTIONS = [
+  'rejectUnauthorized',
+  'ca',
+  'cert',
+  'key',
+  'pfx',
+  'passphrase'
+]
+var IS_BROWSER = process.title === 'browser'
+
+function buildUrl (opts, client) {
+  var 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) {
+  if (!opts.hostname) {
+    opts.hostname = 'localhost'
+  }
+  if (!opts.port) {
+    if (opts.protocol === 'wss') {
+      opts.port = 443
+    } else {
+      opts.port = 80
+    }
+  }
+  if (!opts.path) {
+    opts.path = '/'
+  }
+
+  if (!opts.wsOptions) {
+    opts.wsOptions = {}
+  }
+  if (!IS_BROWSER && opts.protocol === 'wss') {
+    // Add cert/key/ca etc options
+    WSS_OPTIONS.forEach(function (prop) {
+      if (opts.hasOwnProperty(prop) && !opts.wsOptions.hasOwnProperty(prop)) {
+        opts.wsOptions[prop] = opts[prop]
+      }
+    })
+  }
+}
+
+function createWebSocket (client, opts) {
+  var websocketSubProtocol =
+    (opts.protocolId === 'MQIsdp') && (opts.protocolVersion === 3)
+      ? 'mqttv3.1'
+      : 'mqtt'
+
+  setDefaultOpts(opts)
+  var url = buildUrl(opts, client)
+  return websocket(url, [websocketSubProtocol], opts.wsOptions)
+}
+
+function buildBuilder (client, opts) {
+  return createWebSocket(client, opts)
+}
+
+function buildBuilderBrowser (client, opts) {
+  if (!opts.hostname) {
+    opts.hostname = opts.host
+  }
+
+  if (!opts.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.')
+    }
+    var parsed = urlModule.parse(document.URL)
+    opts.hostname = parsed.hostname
+
+    if (!opts.port) {
+      opts.port = parsed.port
+    }
+  }
+  return createWebSocket(client, opts)
+}
+
+if (IS_BROWSER) {
+  module.exports = buildBuilderBrowser
+} else {
+  module.exports = buildBuilder
+}
+
+}).call(this)}).call(this,require('_process'))
+},{"_process":96,"url":128,"websocket-stream":162}],5:[function(require,module,exports){
+'use strict'
+
+/* global wx */
+var socketOpen = false
+var socketMsgQueue = []
+
+function sendSocketMessage (msg) {
+  if (socketOpen) {
+    wx.sendSocketMessage({
+      data: msg.buffer || msg
+    })
+  } else {
+    socketMsgQueue.push(msg)
+  }
+}
+
+function WebSocket (url, protocols) {
+  var ws = {
+    OPEN: 1,
+    CLOSING: 2,
+    CLOSED: 3,
+    readyState: socketOpen ? 1 : 0,
+    send: sendSocketMessage,
+    close: wx.closeSocket,
+    onopen: null,
+    onmessage: null,
+    onclose: null,
+    onerror: null
+  }
+
+  wx.connectSocket({
+    url: url,
+    protocols: protocols
+  })
+  wx.onSocketOpen(function (res) {
+    ws.readyState = ws.OPEN
+    socketOpen = true
+    for (var i = 0; i < socketMsgQueue.length; i++) {
+      sendSocketMessage(socketMsgQueue[i])
+    }
+    socketMsgQueue = []
+
+    ws.onopen && ws.onopen.apply(ws, arguments)
+  })
+  wx.onSocketMessage(function (res) {
+    ws.onmessage && ws.onmessage.apply(ws, arguments)
+  })
+  wx.onSocketClose(function () {
+    ws.onclose && ws.onclose.apply(ws, arguments)
+    ws.readyState = ws.CLOSED
+    socketOpen = false
+  })
+  wx.onSocketError(function () {
+    ws.onerror && ws.onerror.apply(ws, arguments)
+    ws.readyState = ws.CLOSED
+    socketOpen = false
+  })
+
+  return ws
+}
+
+var websocket = require('websocket-stream')
+
+function buildUrl (opts, client) {
+  var protocol = opts.protocol === 'wxs' ? 'wss' : 'ws'
+  var 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 setDefaultOpts (opts) {
+  if (!opts.hostname) {
+    opts.hostname = 'localhost'
+  }
+  if (!opts.path) {
+    opts.path = '/'
+  }
+
+  if (!opts.wsOptions) {
+    opts.wsOptions = {}
+  }
+}
+
+function createWebSocket (client, opts) {
+  var websocketSubProtocol =
+    (opts.protocolId === 'MQIsdp') && (opts.protocolVersion === 3)
+      ? 'mqttv3.1'
+      : 'mqtt'
+
+  setDefaultOpts(opts)
+  var url = buildUrl(opts, client)
+  return websocket(WebSocket(url, [websocketSubProtocol]))
+}
+
+function buildBuilder (client, opts) {
+  opts.hostname = opts.hostname || opts.host
+
+  if (!opts.hostname) {
+    throw new Error('Could not determine host. Specify host manually.')
+  }
+
+  return createWebSocket(client, opts)
+}
+
+module.exports = buildBuilder
+
+},{"websocket-stream":162}],6:[function(require,module,exports){
+(function (process){(function (){
+'use strict'
+
+/**
+ * Module dependencies
+ */
+var xtend = require('xtend')
+
+var Readable = require('readable-stream').Readable
+var streamsOpts = { objectMode: true }
+var defaultStoreOptions = {
+  clean: true
+}
+
+/**
+ * es6-map can preserve insertion order even if ES version is older.
+ *
+ * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map#Description
+ * It should be noted that a Map which is a map of an object, especially
+ * a dictionary of dictionaries, will only map to the object's insertion
+ * order. In ES2015 this is ordered for objects but for older versions of
+ * ES, this may be random and not ordered.
+ *
+ */
+var Map = require('es6-map')
+
+/**
+ * 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 () {
+  var stream = new Readable(streamsOpts)
+  var destroyed = false
+  var values = []
+  var 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
+    }
+
+    var self = this
+
+    destroyed = true
+
+    process.nextTick(function () {
+      self.emit('close')
+    })
+  }
+
+  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
+
+}).call(this)}).call(this,require('_process'))
+},{"_process":96,"es6-map":64,"readable-stream":112,"xtend":165}],7:[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) {
+  var parts = topic.split('/')
+
+  for (var 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 (var i = 0; i < topics.length; i++) {
+    if (!validateTopic(topics[i])) {
+      return topics[i]
+    }
+  }
+  return null
+}
+
+module.exports = {
+  validateTopics: validateTopics
+}
+
+},{}],8:[function(require,module,exports){
+(function (process){(function (){
+'use strict'
+
+var MqttClient = require('../client')
+var Store = require('../store')
+var url = require('url')
+var xtend = require('xtend')
+var protocols = {}
+
+if (process.title !== 'browser') {
+  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.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) {
+  var matches
+  if (opts.auth) {
+    matches = opts.auth.match(/^(.+):(.+)$/)
+    if (matches) {
+      opts.username = matches[1]
+      opts.password = matches[2]
+    } else {
+      opts.username = opts.auth
+    }
+  }
+}
+
+/**
+ * connect - connect to an MQTT broker.
+ *
+ * @param {String} [brokerUrl] - url of the broker, optional
+ * @param {Object} opts - see MqttClient#constructor
+ */
+function connect (brokerUrl, opts) {
+  if ((typeof brokerUrl === 'object') && !opts) {
+    opts = brokerUrl
+    brokerUrl = null
+  }
+
+  opts = opts || {}
+
+  if (brokerUrl) {
+    var parsed = url.parse(brokerUrl, true)
+    if (parsed.port != null) {
+      parsed.port = Number(parsed.port)
+    }
+
+    opts = xtend(parsed, opts)
+
+    if (opts.protocol === null) {
+      throw new Error('Missing protocol')
+    }
+    opts.protocol = opts.protocol.replace(/:$/, '')
+  }
+
+  // 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'].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
+          default:
+            throw new Error('Unknown protocol for secure connection: "' + opts.protocol + '"!')
+        }
+      }
+    } else {
+      // don't know what protocol he want to use, mqtts or wss
+      throw new Error('Missing secure protocol key')
+    }
+  }
+
+  if (!protocols[opts.protocol]) {
+    var isSecure = ['mqtts', 'wss'].indexOf(opts.protocol) !== -1
+    opts.protocol = [
+      'mqtt',
+      'mqtts',
+      'ws',
+      'wss',
+      'wx',
+      'wxs'
+    ].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++
+    }
+
+    return protocols[opts.protocol](client, opts)
+  }
+
+  return new MqttClient(wrapper, opts)
+}
+
+module.exports = connect
+module.exports.connect = connect
+module.exports.MqttClient = MqttClient
+module.exports.Store = Store
+
+}).call(this)}).call(this,require('_process'))
+},{"../client":1,"../store":6,"./tcp":2,"./tls":3,"./ws":4,"./wx":5,"_process":96,"url":128,"xtend":165}],9:[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('')
+}
+
+},{}],10:[function(require,module,exports){
+var DuplexStream = require('readable-stream/duplex')
+  , util         = require('util')
+  , Buffer       = require('safe-buffer').Buffer
+
+
+function BufferList (callback) {
+  if (!(this instanceof BufferList))
+    return new BufferList(callback)
+
+  this._bufs  = []
+  this.length = 0
+
+  if (typeof callback == 'function') {
+    this._callback = callback
+
+    var 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)
+    })
+  } else {
+    this.append(callback)
+  }
+
+  DuplexStream.call(this)
+}
+
+
+util.inherits(BufferList, DuplexStream)
+
+
+BufferList.prototype._offset = function _offset (offset) {
+  var tot = 0, i = 0, _t
+  if (offset === 0) return [ 0, 0 ]
+  for (; i < this._bufs.length; i++) {
+    _t = tot + this._bufs[i].length
+    if (offset < _t || i == this._bufs.length - 1)
+      return [ i, offset - tot ]
+    tot = _t
+  }
+}
+
+
+BufferList.prototype.append = function append (buf) {
+  var i = 0
+
+  if (Buffer.isBuffer(buf)) {
+    this._appendBuffer(buf);
+  } else if (Array.isArray(buf)) {
+    for (; i < buf.length; i++)
+      this.append(buf[i])
+  } else if (buf instanceof BufferList) {
+    // unwrap argument into individual BufferLists
+    for (; i < buf._bufs.length; i++)
+      this.append(buf._bufs[i])
+  } else if (buf != null) {
+    // 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._write = function _write (buf, encoding, callback) {
+  this._appendBuffer(buf)
+
+  if (typeof callback == 'function')
+    callback()
+}
+
+
+BufferList.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)
+}
+
+
+BufferList.prototype.end = function end (chunk) {
+  DuplexStream.prototype.end.call(this, chunk)
+
+  if (this._callback) {
+    this._callback(null, this.slice())
+    this._callback = null
+  }
+}
+
+
+BufferList.prototype.get = function get (index) {
+  return this.slice(index, index + 1)[0]
+}
+
+
+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)
+
+  var copy   = !!dst
+    , off    = this._offset(srcStart)
+    , len    = srcEnd - srcStart
+    , bytes  = len
+    , bufoff = (copy && dstStart) || 0
+    , start  = off[1]
+    , l
+    , i
+
+  // 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 (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 (i = off[0]; i < this._bufs.length; i++) {
+    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 = end || this.length
+
+  if (start < 0)
+    start += this.length
+  if (end < 0)
+    end += this.length
+
+  var startOffset = this._offset(start)
+    , endOffset = this._offset(end)
+    , 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 new BufferList(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 () {
+  var i = 0
+    , copy = new BufferList()
+
+  for (; i < this._bufs.length; i++)
+    copy.append(this._bufs[i])
+
+  return copy
+}
+
+
+BufferList.prototype.destroy = function destroy () {
+  this._bufs.length = 0
+  this.length = 0
+  this.push(null)
+}
+
+
+;(function () {
+  var 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
+  }
+
+  for (var m in methods) {
+    (function (m) {
+      BufferList.prototype[m] = function (offset) {
+        return this.slice(offset, offset + methods[m])[m](0)
+      }
+    }(m))
+  }
+}())
+
+
+module.exports = BufferList
+
+},{"readable-stream/duplex":101,"safe-buffer":114,"util":133}],11:[function(require,module,exports){
+
+},{}],12:[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":9,"buffer":12,"ieee754":83}],13:[function(require,module,exports){
+(function (Buffer){(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.
+
+// NOTE: These type checking functions intentionally don't use `instanceof`
+// because it is fragile and can be easily faked with `Object.create()`.
+
+function isArray(arg) {
+  if (Array.isArray) {
+    return Array.isArray(arg);
+  }
+  return objectToString(arg) === '[object Array]';
+}
+exports.isArray = isArray;
+
+function isBoolean(arg) {
+  return typeof arg === 'boolean';
+}
+exports.isBoolean = isBoolean;
+
+function isNull(arg) {
+  return arg === null;
+}
+exports.isNull = isNull;
+
+function isNullOrUndefined(arg) {
+  return arg == null;
+}
+exports.isNullOrUndefined = isNullOrUndefined;
+
+function isNumber(arg) {
+  return typeof arg === 'number';
+}
+exports.isNumber = isNumber;
+
+function isString(arg) {
+  return typeof arg === 'string';
+}
+exports.isString = isString;
+
+function isSymbol(arg) {
+  return typeof arg === 'symbol';
+}
+exports.isSymbol = isSymbol;
+
+function isUndefined(arg) {
+  return arg === void 0;
+}
+exports.isUndefined = isUndefined;
+
+function isRegExp(re) {
+  return objectToString(re) === '[object RegExp]';
+}
+exports.isRegExp = isRegExp;
+
+function isObject(arg) {
+  return typeof arg === 'object' && arg !== null;
+}
+exports.isObject = isObject;
+
+function isDate(d) {
+  return objectToString(d) === '[object Date]';
+}
+exports.isDate = isDate;
+
+function isError(e) {
+  return (objectToString(e) === '[object Error]' || e instanceof Error);
+}
+exports.isError = isError;
+
+function isFunction(arg) {
+  return typeof arg === 'function';
+}
+exports.isFunction = isFunction;
+
+function isPrimitive(arg) {
+  return arg === null ||
+         typeof arg === 'boolean' ||
+         typeof arg === 'number' ||
+         typeof arg === 'string' ||
+         typeof arg === 'symbol' ||  // ES6 symbol
+         typeof arg === 'undefined';
+}
+exports.isPrimitive = isPrimitive;
+
+exports.isBuffer = Buffer.isBuffer;
+
+function objectToString(o) {
+  return Object.prototype.toString.call(o);
+}
+
+}).call(this)}).call(this,{"isBuffer":require("../../is-buffer/index.js")})
+},{"../../is-buffer/index.js":85}],14:[function(require,module,exports){
+"use strict";
+
+var isValue             = require("type/value/is")
+  , ensureValue         = require("type/value/ensure")
+  , ensurePlainFunction = require("type/plain-function/ensure")
+  , copy                = require("es5-ext/object/copy")
+  , normalizeOptions    = require("es5-ext/object/normalize-options")
+  , map                 = require("es5-ext/object/map");
+
+var bind = Function.prototype.bind
+  , defineProperty = Object.defineProperty
+  , hasOwnProperty = Object.prototype.hasOwnProperty
+  , define;
+
+define = function (name, desc, options) {
+	var value = ensureValue(desc) && ensurePlainFunction(desc.value), dgs;
+	dgs = copy(desc);
+	delete dgs.writable;
+	delete dgs.value;
+	dgs.get = function () {
+		if (!options.overwriteDefinition && hasOwnProperty.call(this, name)) return value;
+		desc.value = bind.call(value, options.resolveContext ? options.resolveContext(this) : this);
+		defineProperty(this, name, desc);
+		return this[name];
+	};
+	return dgs;
+};
+
+module.exports = function (props/*, options*/) {
+	var options = normalizeOptions(arguments[1]);
+	if (isValue(options.resolveContext)) ensurePlainFunction(options.resolveContext);
+	return map(props, function (desc, name) { return define(name, desc, options); });
+};
+
+},{"es5-ext/object/copy":37,"es5-ext/object/map":45,"es5-ext/object/normalize-options":46,"type/plain-function/ensure":122,"type/value/ensure":126,"type/value/is":127}],15:[function(require,module,exports){
+"use strict";
+
+var isValue         = require("type/value/is")
+  , isPlainFunction = require("type/plain-function/is")
+  , assign          = require("es5-ext/object/assign")
+  , normalizeOpts   = require("es5-ext/object/normalize-options")
+  , contains        = require("es5-ext/string/#/contains");
+
+var d = (module.exports = function (dscr, value/*, options*/) {
+	var c, e, w, options, desc;
+	if (arguments.length < 2 || typeof dscr !== "string") {
+		options = value;
+		value = dscr;
+		dscr = null;
+	} else {
+		options = arguments[2];
+	}
+	if (isValue(dscr)) {
+		c = contains.call(dscr, "c");
+		e = contains.call(dscr, "e");
+		w = contains.call(dscr, "w");
+	} else {
+		c = w = true;
+		e = false;
+	}
+
+	desc = { value: value, configurable: c, enumerable: e, writable: w };
+	return !options ? desc : assign(normalizeOpts(options), desc);
+});
+
+d.gs = function (dscr, get, set/*, options*/) {
+	var c, e, options, desc;
+	if (typeof dscr !== "string") {
+		options = set;
+		set = get;
+		get = dscr;
+		dscr = null;
+	} else {
+		options = arguments[3];
+	}
+	if (!isValue(get)) {
+		get = undefined;
+	} else if (!isPlainFunction(get)) {
+		options = get;
+		get = set = undefined;
+	} else if (!isValue(set)) {
+		set = undefined;
+	} else if (!isPlainFunction(set)) {
+		options = set;
+		set = undefined;
+	}
+	if (isValue(dscr)) {
+		c = contains.call(dscr, "c");
+		e = contains.call(dscr, "e");
+	} else {
+		c = true;
+		e = false;
+	}
+
+	desc = { get: get, set: set, configurable: c, enumerable: e };
+	return !options ? desc : assign(normalizeOpts(options), desc);
+};
+
+},{"es5-ext/object/assign":34,"es5-ext/object/normalize-options":46,"es5-ext/string/#/contains":53,"type/plain-function/is":123,"type/value/is":127}],16:[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":96,"once":94}],17:[function(require,module,exports){
+// Inspired by Google Closure:
+// http://closure-library.googlecode.com/svn/docs/
+// closure_goog_array_array.js.html#goog.array.clear
+
+"use strict";
+
+var value = require("../../object/valid-value");
+
+module.exports = function () {
+	value(this).length = 0;
+	return this;
+};
+
+},{"../../object/valid-value":52}],18:[function(require,module,exports){
+"use strict";
+
+var numberIsNaN       = require("../../number/is-nan")
+  , toPosInt          = require("../../number/to-pos-integer")
+  , value             = require("../../object/valid-value")
+  , indexOf           = Array.prototype.indexOf
+  , objHasOwnProperty = Object.prototype.hasOwnProperty
+  , abs               = Math.abs
+  , floor             = Math.floor;
+
+module.exports = function (searchElement/*, fromIndex*/) {
+	var i, length, fromIndex, val;
+	if (!numberIsNaN(searchElement)) return indexOf.apply(this, arguments);
+
+	length = toPosInt(value(this).length);
+	fromIndex = arguments[1];
+	if (isNaN(fromIndex)) fromIndex = 0;
+	else if (fromIndex >= 0) fromIndex = floor(fromIndex);
+	else fromIndex = toPosInt(this.length) - floor(abs(fromIndex));
+
+	for (i = fromIndex; i < length; ++i) {
+		if (objHasOwnProperty.call(this, i)) {
+			val = this[i];
+			if (numberIsNaN(val)) return i; // Jslint: ignore
+		}
+	}
+	return -1;
+};
+
+},{"../../number/is-nan":28,"../../number/to-pos-integer":32,"../../object/valid-value":52}],19:[function(require,module,exports){
+"use strict";
+
+module.exports = require("./is-implemented")() ? Array.from : require("./shim");
+
+},{"./is-implemented":20,"./shim":21}],20:[function(require,module,exports){
+"use strict";
+
+module.exports = function () {
+	var from = Array.from, arr, result;
+	if (typeof from !== "function") return false;
+	arr = ["raz", "dwa"];
+	result = from(arr);
+	return Boolean(result && result !== arr && result[1] === "dwa");
+};
+
+},{}],21:[function(require,module,exports){
+"use strict";
+
+var iteratorSymbol = require("es6-symbol").iterator
+  , isArguments    = require("../../function/is-arguments")
+  , isFunction     = require("../../function/is-function")
+  , toPosInt       = require("../../number/to-pos-integer")
+  , callable       = require("../../object/valid-callable")
+  , validValue     = require("../../object/valid-value")
+  , isValue        = require("../../object/is-value")
+  , isString       = require("../../string/is-string")
+  , isArray        = Array.isArray
+  , call           = Function.prototype.call
+  , desc           = { configurable: true, enumerable: true, writable: true, value: null }
+  , defineProperty = Object.defineProperty;
+
+// eslint-disable-next-line complexity, max-lines-per-function
+module.exports = function (arrayLike/*, mapFn, thisArg*/) {
+	var mapFn = arguments[1]
+	  , thisArg = arguments[2]
+	  , Context
+	  , i
+	  , j
+	  , arr
+	  , length
+	  , code
+	  , iterator
+	  , result
+	  , getIterator
+	  , value;
+
+	arrayLike = Object(validValue(arrayLike));
+
+	if (isValue(mapFn)) callable(mapFn);
+	if (!this || this === Array || !isFunction(this)) {
+		// Result: Plain array
+		if (!mapFn) {
+			if (isArguments(arrayLike)) {
+				// Source: Arguments
+				length = arrayLike.length;
+				if (length !== 1) return Array.apply(null, arrayLike);
+				arr = new Array(1);
+				arr[0] = arrayLike[0];
+				return arr;
+			}
+			if (isArray(arrayLike)) {
+				// Source: Array
+				arr = new Array((length = arrayLike.length));
+				for (i = 0; i < length; ++i) arr[i] = arrayLike[i];
+				return arr;
+			}
+		}
+		arr = [];
+	} else {
+		// Result: Non plain array
+		Context = this;
+	}
+
+	if (!isArray(arrayLike)) {
+		if ((getIterator = arrayLike[iteratorSymbol]) !== undefined) {
+			// Source: Iterator
+			iterator = callable(getIterator).call(arrayLike);
+			if (Context) arr = new Context();
+			result = iterator.next();
+			i = 0;
+			while (!result.done) {
+				value = mapFn ? call.call(mapFn, thisArg, result.value, i) : result.value;
+				if (Context) {
+					desc.value = value;
+					defineProperty(arr, i, desc);
+				} else {
+					arr[i] = value;
+				}
+				result = iterator.next();
+				++i;
+			}
+			length = i;
+		} else if (isString(arrayLike)) {
+			// Source: String
+			length = arrayLike.length;
+			if (Context) arr = new Context();
+			for (i = 0, j = 0; i < length; ++i) {
+				value = arrayLike[i];
+				if (i + 1 < length) {
+					code = value.charCodeAt(0);
+					// eslint-disable-next-line max-depth
+					if (code >= 0xd800 && code <= 0xdbff) value += arrayLike[++i];
+				}
+				value = mapFn ? call.call(mapFn, thisArg, value, j) : value;
+				if (Context) {
+					desc.value = value;
+					defineProperty(arr, j, desc);
+				} else {
+					arr[j] = value;
+				}
+				++j;
+			}
+			length = j;
+		}
+	}
+	if (length === undefined) {
+		// Source: array or array-like
+		length = toPosInt(arrayLike.length);
+		if (Context) arr = new Context(length);
+		for (i = 0; i < length; ++i) {
+			value = mapFn ? call.call(mapFn, thisArg, arrayLike[i], i) : arrayLike[i];
+			if (Context) {
+				desc.value = value;
+				defineProperty(arr, i, desc);
+			} else {
+				arr[i] = value;
+			}
+		}
+	}
+	if (Context) {
+		desc.value = null;
+		arr.length = length;
+	}
+	return arr;
+};
+
+},{"../../function/is-arguments":22,"../../function/is-function":23,"../../number/to-pos-integer":32,"../../object/is-value":41,"../../object/valid-callable":51,"../../object/valid-value":52,"../../string/is-string":56,"es6-symbol":70}],22:[function(require,module,exports){
+"use strict";
+
+var objToString = Object.prototype.toString
+  , id = objToString.call((function () { return arguments; })());
+
+module.exports = function (value) { return objToString.call(value) === id; };
+
+},{}],23:[function(require,module,exports){
+"use strict";
+
+var objToString = Object.prototype.toString
+  , isFunctionStringTag = RegExp.prototype.test.bind(/^[object [A-Za-z0-9]*Function]$/);
+
+module.exports = function (value) {
+	return typeof value === "function" && isFunctionStringTag(objToString.call(value));
+};
+
+},{}],24:[function(require,module,exports){
+"use strict";
+
+// eslint-disable-next-line no-empty-function
+module.exports = function () {};
+
+},{}],25:[function(require,module,exports){
+"use strict";
+
+module.exports = require("./is-implemented")() ? Math.sign : require("./shim");
+
+},{"./is-implemented":26,"./shim":27}],26:[function(require,module,exports){
+"use strict";
+
+module.exports = function () {
+	var sign = Math.sign;
+	if (typeof sign !== "function") return false;
+	return sign(10) === 1 && sign(-20) === -1;
+};
+
+},{}],27:[function(require,module,exports){
+"use strict";
+
+module.exports = function (value) {
+	value = Number(value);
+	if (isNaN(value) || value === 0) return value;
+	return value > 0 ? 1 : -1;
+};
+
+},{}],28:[function(require,module,exports){
+"use strict";
+
+module.exports = require("./is-implemented")() ? Number.isNaN : require("./shim");
+
+},{"./is-implemented":29,"./shim":30}],29:[function(require,module,exports){
+"use strict";
+
+module.exports = function () {
+	var numberIsNaN = Number.isNaN;
+	if (typeof numberIsNaN !== "function") return false;
+	return !numberIsNaN({}) && numberIsNaN(NaN) && !numberIsNaN(34);
+};
+
+},{}],30:[function(require,module,exports){
+"use strict";
+
+module.exports = function (value) {
+	// eslint-disable-next-line no-self-compare
+	return value !== value;
+};
+
+},{}],31:[function(require,module,exports){
+"use strict";
+
+var sign  = require("../math/sign")
+  , abs   = Math.abs
+  , floor = Math.floor;
+
+module.exports = function (value) {
+	if (isNaN(value)) return 0;
+	value = Number(value);
+	if (value === 0 || !isFinite(value)) return value;
+	return sign(value) * floor(abs(value));
+};
+
+},{"../math/sign":25}],32:[function(require,module,exports){
+"use strict";
+
+var toInteger = require("./to-integer")
+  , max       = Math.max;
+
+module.exports = function (value) { return max(0, toInteger(value)); };
+
+},{"./to-integer":31}],33:[function(require,module,exports){
+// Internal method, used by iteration functions.
+// Calls a function for each key-value pair found in object
+// Optionally takes compareFn to iterate object in specific order
+
+"use strict";
+
+var callable                = require("./valid-callable")
+  , value                   = require("./valid-value")
+  , bind                    = Function.prototype.bind
+  , call                    = Function.prototype.call
+  , keys                    = Object.keys
+  , objPropertyIsEnumerable = Object.prototype.propertyIsEnumerable;
+
+module.exports = function (method, defVal) {
+	return function (obj, cb/*, thisArg, compareFn*/) {
+		var list, thisArg = arguments[2], compareFn = arguments[3];
+		obj = Object(value(obj));
+		callable(cb);
+
+		list = keys(obj);
+		if (compareFn) {
+			list.sort(typeof compareFn === "function" ? bind.call(compareFn, obj) : undefined);
+		}
+		if (typeof method !== "function") method = list[method];
+		return call.call(method, list, function (key, index) {
+			if (!objPropertyIsEnumerable.call(obj, key)) return defVal;
+			return call.call(cb, thisArg, obj[key], key, obj, index);
+		});
+	};
+};
+
+},{"./valid-callable":51,"./valid-value":52}],34:[function(require,module,exports){
+"use strict";
+
+module.exports = require("./is-implemented")() ? Object.assign : require("./shim");
+
+},{"./is-implemented":35,"./shim":36}],35:[function(require,module,exports){
+"use strict";
+
+module.exports = function () {
+	var assign = Object.assign, obj;
+	if (typeof assign !== "function") return false;
+	obj = { foo: "raz" };
+	assign(obj, { bar: "dwa" }, { trzy: "trzy" });
+	return obj.foo + obj.bar + obj.trzy === "razdwatrzy";
+};
+
+},{}],36:[function(require,module,exports){
+"use strict";
+
+var keys  = require("../keys")
+  , value = require("../valid-value")
+  , max   = Math.max;
+
+module.exports = function (dest, src/*, …srcn*/) {
+	var error, i, length = max(arguments.length, 2), assign;
+	dest = Object(value(dest));
+	assign = function (key) {
+		try {
+			dest[key] = src[key];
+		} catch (e) {
+			if (!error) error = e;
+		}
+	};
+	for (i = 1; i < length; ++i) {
+		src = arguments[i];
+		keys(src).forEach(assign);
+	}
+	if (error !== undefined) throw error;
+	return dest;
+};
+
+},{"../keys":42,"../valid-value":52}],37:[function(require,module,exports){
+"use strict";
+
+var aFrom  = require("../array/from")
+  , assign = require("./assign")
+  , value  = require("./valid-value");
+
+module.exports = function (obj/*, propertyNames, options*/) {
+	var copy = Object(value(obj)), propertyNames = arguments[1], options = Object(arguments[2]);
+	if (copy !== obj && !propertyNames) return copy;
+	var result = {};
+	if (propertyNames) {
+		aFrom(propertyNames, function (propertyName) {
+			if (options.ensure || propertyName in obj) result[propertyName] = obj[propertyName];
+		});
+	} else {
+		assign(result, obj);
+	}
+	return result;
+};
+
+},{"../array/from":19,"./assign":34,"./valid-value":52}],38:[function(require,module,exports){
+// Workaround for http://code.google.com/p/v8/issues/detail?id=2804
+
+"use strict";
+
+var create = Object.create, shim;
+
+if (!require("./set-prototype-of/is-implemented")()) {
+	shim = require("./set-prototype-of/shim");
+}
+
+module.exports = (function () {
+	var nullObject, polyProps, desc;
+	if (!shim) return create;
+	if (shim.level !== 1) return create;
+
+	nullObject = {};
+	polyProps = {};
+	desc = { configurable: false, enumerable: false, writable: true, value: undefined };
+	Object.getOwnPropertyNames(Object.prototype).forEach(function (name) {
+		if (name === "__proto__") {
+			polyProps[name] = {
+				configurable: true,
+				enumerable: false,
+				writable: true,
+				value: undefined
+			};
+			return;
+		}
+		polyProps[name] = desc;
+	});
+	Object.defineProperties(nullObject, polyProps);
+
+	Object.defineProperty(shim, "nullPolyfill", {
+		configurable: false,
+		enumerable: false,
+		writable: false,
+		value: nullObject
+	});
+
+	return function (prototype, props) {
+		return create(prototype === null ? nullObject : prototype, props);
+	};
+})();
+
+},{"./set-prototype-of/is-implemented":49,"./set-prototype-of/shim":50}],39:[function(require,module,exports){
+"use strict";
+
+module.exports = require("./_iterate")("forEach");
+
+},{"./_iterate":33}],40:[function(require,module,exports){
+"use strict";
+
+var isValue = require("./is-value");
+
+var map = { function: true, object: true };
+
+module.exports = function (value) { return (isValue(value) && map[typeof value]) || false; };
+
+},{"./is-value":41}],41:[function(require,module,exports){
+"use strict";
+
+var _undefined = require("../function/noop")(); // Support ES3 engines
+
+module.exports = function (val) { return val !== _undefined && val !== null; };
+
+},{"../function/noop":24}],42:[function(require,module,exports){
+"use strict";
+
+module.exports = require("./is-implemented")() ? Object.keys : require("./shim");
+
+},{"./is-implemented":43,"./shim":44}],43:[function(require,module,exports){
+"use strict";
+
+module.exports = function () {
+	try {
+		Object.keys("primitive");
+		return true;
+	} catch (e) {
+		return false;
+	}
+};
+
+},{}],44:[function(require,module,exports){
+"use strict";
+
+var isValue = require("../is-value");
+
+var keys = Object.keys;
+
+module.exports = function (object) { return keys(isValue(object) ? Object(object) : object); };
+
+},{"../is-value":41}],45:[function(require,module,exports){
+"use strict";
+
+var callable = require("./valid-callable")
+  , forEach  = require("./for-each")
+  , call     = Function.prototype.call;
+
+module.exports = function (obj, cb/*, thisArg*/) {
+	var result = {}, thisArg = arguments[2];
+	callable(cb);
+	forEach(obj, function (value, key, targetObj, index) {
+		result[key] = call.call(cb, thisArg, value, key, targetObj, index);
+	});
+	return result;
+};
+
+},{"./for-each":39,"./valid-callable":51}],46:[function(require,module,exports){
+"use strict";
+
+var isValue = require("./is-value");
+
+var forEach = Array.prototype.forEach, create = Object.create;
+
+var process = function (src, obj) {
+	var key;
+	for (key in src) obj[key] = src[key];
+};
+
+// eslint-disable-next-line no-unused-vars
+module.exports = function (opts1/*, …options*/) {
+	var result = create(null);
+	forEach.call(arguments, function (options) {
+		if (!isValue(options)) return;
+		process(Object(options), result);
+	});
+	return result;
+};
+
+},{"./is-value":41}],47:[function(require,module,exports){
+"use strict";
+
+var forEach = Array.prototype.forEach, create = Object.create;
+
+// eslint-disable-next-line no-unused-vars
+module.exports = function (arg/*, …args*/) {
+	var set = create(null);
+	forEach.call(arguments, function (name) { set[name] = true; });
+	return set;
+};
+
+},{}],48:[function(require,module,exports){
+"use strict";
+
+module.exports = require("./is-implemented")() ? Object.setPrototypeOf : require("./shim");
+
+},{"./is-implemented":49,"./shim":50}],49:[function(require,module,exports){
+"use strict";
+
+var create = Object.create, getPrototypeOf = Object.getPrototypeOf, plainObject = {};
+
+module.exports = function (/* CustomCreate*/) {
+	var setPrototypeOf = Object.setPrototypeOf, customCreate = arguments[0] || create;
+	if (typeof setPrototypeOf !== "function") return false;
+	return getPrototypeOf(setPrototypeOf(customCreate(null), plainObject)) === plainObject;
+};
+
+},{}],50:[function(require,module,exports){
+/* eslint no-proto: "off" */
+
+// Big thanks to @WebReflection for sorting this out
+// https://gist.github.com/WebReflection/5593554
+
+"use strict";
+
+var isObject         = require("../is-object")
+  , value            = require("../valid-value")
+  , objIsPrototypeOf = Object.prototype.isPrototypeOf
+  , defineProperty   = Object.defineProperty
+  , nullDesc         = { configurable: true, enumerable: false, writable: true, value: undefined }
+  , validate;
+
+validate = function (obj, prototype) {
+	value(obj);
+	if (prototype === null || isObject(prototype)) return obj;
+	throw new TypeError("Prototype must be null or an object");
+};
+
+module.exports = (function (status) {
+	var fn, set;
+	if (!status) return null;
+	if (status.level === 2) {
+		if (status.set) {
+			set = status.set;
+			fn = function (obj, prototype) {
+				set.call(validate(obj, prototype), prototype);
+				return obj;
+			};
+		} else {
+			fn = function (obj, prototype) {
+				validate(obj, prototype).__proto__ = prototype;
+				return obj;
+			};
+		}
+	} else {
+		fn = function self(obj, prototype) {
+			var isNullBase;
+			validate(obj, prototype);
+			isNullBase = objIsPrototypeOf.call(self.nullPolyfill, obj);
+			if (isNullBase) delete self.nullPolyfill.__proto__;
+			if (prototype === null) prototype = self.nullPolyfill;
+			obj.__proto__ = prototype;
+			if (isNullBase) defineProperty(self.nullPolyfill, "__proto__", nullDesc);
+			return obj;
+		};
+	}
+	return Object.defineProperty(fn, "level", {
+		configurable: false,
+		enumerable: false,
+		writable: false,
+		value: status.level
+	});
+})(
+	(function () {
+		var tmpObj1 = Object.create(null)
+		  , tmpObj2 = {}
+		  , set
+		  , desc = Object.getOwnPropertyDescriptor(Object.prototype, "__proto__");
+
+		if (desc) {
+			try {
+				set = desc.set; // Opera crashes at this point
+				set.call(tmpObj1, tmpObj2);
+			} catch (ignore) {}
+			if (Object.getPrototypeOf(tmpObj1) === tmpObj2) return { set: set, level: 2 };
+		}
+
+		tmpObj1.__proto__ = tmpObj2;
+		if (Object.getPrototypeOf(tmpObj1) === tmpObj2) return { level: 2 };
+
+		tmpObj1 = {};
+		tmpObj1.__proto__ = tmpObj2;
+		if (Object.getPrototypeOf(tmpObj1) === tmpObj2) return { level: 1 };
+
+		return false;
+	})()
+);
+
+require("../create");
+
+},{"../create":38,"../is-object":40,"../valid-value":52}],51:[function(require,module,exports){
+"use strict";
+
+module.exports = function (fn) {
+	if (typeof fn !== "function") throw new TypeError(fn + " is not a function");
+	return fn;
+};
+
+},{}],52:[function(require,module,exports){
+"use strict";
+
+var isValue = require("./is-value");
+
+module.exports = function (value) {
+	if (!isValue(value)) throw new TypeError("Cannot use null or undefined");
+	return value;
+};
+
+},{"./is-value":41}],53:[function(require,module,exports){
+"use strict";
+
+module.exports = require("./is-implemented")() ? String.prototype.contains : require("./shim");
+
+},{"./is-implemented":54,"./shim":55}],54:[function(require,module,exports){
+"use strict";
+
+var str = "razdwatrzy";
+
+module.exports = function () {
+	if (typeof str.contains !== "function") return false;
+	return str.contains("dwa") === true && str.contains("foo") === false;
+};
+
+},{}],55:[function(require,module,exports){
+"use strict";
+
+var indexOf = String.prototype.indexOf;
+
+module.exports = function (searchString/*, position*/) {
+	return indexOf.call(this, searchString, arguments[1]) > -1;
+};
+
+},{}],56:[function(require,module,exports){
+"use strict";
+
+var objToString = Object.prototype.toString, id = objToString.call("");
+
+module.exports = function (value) {
+	return (
+		typeof value === "string" ||
+		(value &&
+			typeof value === "object" &&
+			(value instanceof String || objToString.call(value) === id)) ||
+		false
+	);
+};
+
+},{}],57:[function(require,module,exports){
+"use strict";
+
+var setPrototypeOf = require("es5-ext/object/set-prototype-of")
+  , contains       = require("es5-ext/string/#/contains")
+  , d              = require("d")
+  , Symbol         = require("es6-symbol")
+  , Iterator       = require("./");
+
+var defineProperty = Object.defineProperty, ArrayIterator;
+
+ArrayIterator = module.exports = function (arr, kind) {
+	if (!(this instanceof ArrayIterator)) throw new TypeError("Constructor requires 'new'");
+	Iterator.call(this, arr);
+	if (!kind) kind = "value";
+	else if (contains.call(kind, "key+value")) kind = "key+value";
+	else if (contains.call(kind, "key")) kind = "key";
+	else kind = "value";
+	defineProperty(this, "__kind__", d("", kind));
+};
+if (setPrototypeOf) setPrototypeOf(ArrayIterator, Iterator);
+
+// Internal %ArrayIteratorPrototype% doesn't expose its constructor
+delete ArrayIterator.prototype.constructor;
+
+ArrayIterator.prototype = Object.create(Iterator.prototype, {
+	_resolve: d(function (i) {
+		if (this.__kind__ === "value") return this.__list__[i];
+		if (this.__kind__ === "key+value") return [i, this.__list__[i]];
+		return i;
+	})
+});
+defineProperty(ArrayIterator.prototype, Symbol.toStringTag, d("c", "Array Iterator"));
+
+},{"./":60,"d":15,"es5-ext/object/set-prototype-of":48,"es5-ext/string/#/contains":53,"es6-symbol":70}],58:[function(require,module,exports){
+"use strict";
+
+var isArguments = require("es5-ext/function/is-arguments")
+  , callable    = require("es5-ext/object/valid-callable")
+  , isString    = require("es5-ext/string/is-string")
+  , get         = require("./get");
+
+var isArray = Array.isArray, call = Function.prototype.call, some = Array.prototype.some;
+
+module.exports = function (iterable, cb /*, thisArg*/) {
+	var mode, thisArg = arguments[2], result, doBreak, broken, i, length, char, code;
+	if (isArray(iterable) || isArguments(iterable)) mode = "array";
+	else if (isString(iterable)) mode = "string";
+	else iterable = get(iterable);
+
+	callable(cb);
+	doBreak = function () {
+		broken = true;
+	};
+	if (mode === "array") {
+		some.call(iterable, function (value) {
+			call.call(cb, thisArg, value, doBreak);
+			return broken;
+		});
+		return;
+	}
+	if (mode === "string") {
+		length = iterable.length;
+		for (i = 0; i < length; ++i) {
+			char = iterable[i];
+			if (i + 1 < length) {
+				code = char.charCodeAt(0);
+				if (code >= 0xd800 && code <= 0xdbff) char += iterable[++i];
+			}
+			call.call(cb, thisArg, char, doBreak);
+			if (broken) break;
+		}
+		return;
+	}
+	result = iterable.next();
+
+	while (!result.done) {
+		call.call(cb, thisArg, result.value, doBreak);
+		if (broken) return;
+		result = iterable.next();
+	}
+};
+
+},{"./get":59,"es5-ext/function/is-arguments":22,"es5-ext/object/valid-callable":51,"es5-ext/string/is-string":56}],59:[function(require,module,exports){
+"use strict";
+
+var isArguments    = require("es5-ext/function/is-arguments")
+  , isString       = require("es5-ext/string/is-string")
+  , ArrayIterator  = require("./array")
+  , StringIterator = require("./string")
+  , iterable       = require("./valid-iterable")
+  , iteratorSymbol = require("es6-symbol").iterator;
+
+module.exports = function (obj) {
+	if (typeof iterable(obj)[iteratorSymbol] === "function") return obj[iteratorSymbol]();
+	if (isArguments(obj)) return new ArrayIterator(obj);
+	if (isString(obj)) return new StringIterator(obj);
+	return new ArrayIterator(obj);
+};
+
+},{"./array":57,"./string":62,"./valid-iterable":63,"es5-ext/function/is-arguments":22,"es5-ext/string/is-string":56,"es6-symbol":70}],60:[function(require,module,exports){
+"use strict";
+
+var clear    = require("es5-ext/array/#/clear")
+  , assign   = require("es5-ext/object/assign")
+  , callable = require("es5-ext/object/valid-callable")
+  , value    = require("es5-ext/object/valid-value")
+  , d        = require("d")
+  , autoBind = require("d/auto-bind")
+  , Symbol   = require("es6-symbol");
+
+var defineProperty = Object.defineProperty, defineProperties = Object.defineProperties, Iterator;
+
+module.exports = Iterator = function (list, context) {
+	if (!(this instanceof Iterator)) throw new TypeError("Constructor requires 'new'");
+	defineProperties(this, {
+		__list__: d("w", value(list)),
+		__context__: d("w", context),
+		__nextIndex__: d("w", 0)
+	});
+	if (!context) return;
+	callable(context.on);
+	context.on("_add", this._onAdd);
+	context.on("_delete", this._onDelete);
+	context.on("_clear", this._onClear);
+};
+
+// Internal %IteratorPrototype% doesn't expose its constructor
+delete Iterator.prototype.constructor;
+
+defineProperties(
+	Iterator.prototype,
+	assign(
+		{
+			_next: d(function () {
+				var i;
+				if (!this.__list__) return undefined;
+				if (this.__redo__) {
+					i = this.__redo__.shift();
+					if (i !== undefined) return i;
+				}
+				if (this.__nextIndex__ < this.__list__.length) return this.__nextIndex__++;
+				this._unBind();
+				return undefined;
+			}),
+			next: d(function () {
+				return this._createResult(this._next());
+			}),
+			_createResult: d(function (i) {
+				if (i === undefined) return { done: true, value: undefined };
+				return { done: false, value: this._resolve(i) };
+			}),
+			_resolve: d(function (i) {
+				return this.__list__[i];
+			}),
+			_unBind: d(function () {
+				this.__list__ = null;
+				delete this.__redo__;
+				if (!this.__context__) return;
+				this.__context__.off("_add", this._onAdd);
+				this.__context__.off("_delete", this._onDelete);
+				this.__context__.off("_clear", this._onClear);
+				this.__context__ = null;
+			}),
+			toString: d(function () {
+				return "[object " + (this[Symbol.toStringTag] || "Object") + "]";
+			})
+		},
+		autoBind({
+			_onAdd: d(function (index) {
+				if (index >= this.__nextIndex__) return;
+				++this.__nextIndex__;
+				if (!this.__redo__) {
+					defineProperty(this, "__redo__", d("c", [index]));
+					return;
+				}
+				this.__redo__.forEach(function (redo, i) {
+					if (redo >= index) this.__redo__[i] = ++redo;
+				}, this);
+				this.__redo__.push(index);
+			}),
+			_onDelete: d(function (index) {
+				var i;
+				if (index >= this.__nextIndex__) return;
+				--this.__nextIndex__;
+				if (!this.__redo__) return;
+				i = this.__redo__.indexOf(index);
+				if (i !== -1) this.__redo__.splice(i, 1);
+				this.__redo__.forEach(function (redo, j) {
+					if (redo > index) this.__redo__[j] = --redo;
+				}, this);
+			}),
+			_onClear: d(function () {
+				if (this.__redo__) clear.call(this.__redo__);
+				this.__nextIndex__ = 0;
+			})
+		})
+	)
+);
+
+defineProperty(
+	Iterator.prototype,
+	Symbol.iterator,
+	d(function () {
+		return this;
+	})
+);
+
+},{"d":15,"d/auto-bind":14,"es5-ext/array/#/clear":17,"es5-ext/object/assign":34,"es5-ext/object/valid-callable":51,"es5-ext/object/valid-value":52,"es6-symbol":70}],61:[function(require,module,exports){
+"use strict";
+
+var isArguments = require("es5-ext/function/is-arguments")
+  , isValue     = require("es5-ext/object/is-value")
+  , isString    = require("es5-ext/string/is-string");
+
+var iteratorSymbol = require("es6-symbol").iterator
+  , isArray        = Array.isArray;
+
+module.exports = function (value) {
+	if (!isValue(value)) return false;
+	if (isArray(value)) return true;
+	if (isString(value)) return true;
+	if (isArguments(value)) return true;
+	return typeof value[iteratorSymbol] === "function";
+};
+
+},{"es5-ext/function/is-arguments":22,"es5-ext/object/is-value":41,"es5-ext/string/is-string":56,"es6-symbol":70}],62:[function(require,module,exports){
+// Thanks @mathiasbynens
+// http://mathiasbynens.be/notes/javascript-unicode#iterating-over-symbols
+
+"use strict";
+
+var setPrototypeOf = require("es5-ext/object/set-prototype-of")
+  , d              = require("d")
+  , Symbol         = require("es6-symbol")
+  , Iterator       = require("./");
+
+var defineProperty = Object.defineProperty, StringIterator;
+
+StringIterator = module.exports = function (str) {
+	if (!(this instanceof StringIterator)) throw new TypeError("Constructor requires 'new'");
+	str = String(str);
+	Iterator.call(this, str);
+	defineProperty(this, "__length__", d("", str.length));
+};
+if (setPrototypeOf) setPrototypeOf(StringIterator, Iterator);
+
+// Internal %ArrayIteratorPrototype% doesn't expose its constructor
+delete StringIterator.prototype.constructor;
+
+StringIterator.prototype = Object.create(Iterator.prototype, {
+	_next: d(function () {
+		if (!this.__list__) return undefined;
+		if (this.__nextIndex__ < this.__length__) return this.__nextIndex__++;
+		this._unBind();
+		return undefined;
+	}),
+	_resolve: d(function (i) {
+		var char = this.__list__[i], code;
+		if (this.__nextIndex__ === this.__length__) return char;
+		code = char.charCodeAt(0);
+		if (code >= 0xd800 && code <= 0xdbff) return char + this.__list__[this.__nextIndex__++];
+		return char;
+	})
+});
+defineProperty(StringIterator.prototype, Symbol.toStringTag, d("c", "String Iterator"));
+
+},{"./":60,"d":15,"es5-ext/object/set-prototype-of":48,"es6-symbol":70}],63:[function(require,module,exports){
+"use strict";
+
+var isIterable = require("./is-iterable");
+
+module.exports = function (value) {
+	if (!isIterable(value)) throw new TypeError(value + " is not iterable");
+	return value;
+};
+
+},{"./is-iterable":61}],64:[function(require,module,exports){
+'use strict';
+
+module.exports = require('./is-implemented')() ? Map : require('./polyfill');
+
+},{"./is-implemented":65,"./polyfill":69}],65:[function(require,module,exports){
+'use strict';
+
+module.exports = function () {
+	var map, iterator, result;
+	if (typeof Map !== 'function') return false;
+	try {
+		// WebKit doesn't support arguments and crashes
+		map = new Map([['raz', 'one'], ['dwa', 'two'], ['trzy', 'three']]);
+	} catch (e) {
+		return false;
+	}
+	if (String(map) !== '[object Map]') return false;
+	if (map.size !== 3) return false;
+	if (typeof map.clear !== 'function') return false;
+	if (typeof map.delete !== 'function') return false;
+	if (typeof map.entries !== 'function') return false;
+	if (typeof map.forEach !== 'function') return false;
+	if (typeof map.get !== 'function') return false;
+	if (typeof map.has !== 'function') return false;
+	if (typeof map.keys !== 'function') return false;
+	if (typeof map.set !== 'function') return false;
+	if (typeof map.values !== 'function') return false;
+
+	iterator = map.entries();
+	result = iterator.next();
+	if (result.done !== false) return false;
+	if (!result.value) return false;
+	if (result.value[0] !== 'raz') return false;
+	if (result.value[1] !== 'one') return false;
+
+	return true;
+};
+
+},{}],66:[function(require,module,exports){
+// Exports true if environment provides native `Map` implementation,
+// whatever that is.
+
+'use strict';
+
+module.exports = (function () {
+	if (typeof Map === 'undefined') return false;
+	return (Object.prototype.toString.call(new Map()) === '[object Map]');
+}());
+
+},{}],67:[function(require,module,exports){
+'use strict';
+
+module.exports = require('es5-ext/object/primitive-set')('key',
+	'value', 'key+value');
+
+},{"es5-ext/object/primitive-set":47}],68:[function(require,module,exports){
+'use strict';
+
+var setPrototypeOf    = require('es5-ext/object/set-prototype-of')
+  , d                 = require('d')
+  , Iterator          = require('es6-iterator')
+  , toStringTagSymbol = require('es6-symbol').toStringTag
+  , kinds             = require('./iterator-kinds')
+
+  , defineProperties = Object.defineProperties
+  , unBind = Iterator.prototype._unBind
+  , MapIterator;
+
+MapIterator = module.exports = function (map, kind) {
+	if (!(this instanceof MapIterator)) return new MapIterator(map, kind);
+	Iterator.call(this, map.__mapKeysData__, map);
+	if (!kind || !kinds[kind]) kind = 'key+value';
+	defineProperties(this, {
+		__kind__: d('', kind),
+		__values__: d('w', map.__mapValuesData__)
+	});
+};
+if (setPrototypeOf) setPrototypeOf(MapIterator, Iterator);
+
+MapIterator.prototype = Object.create(Iterator.prototype, {
+	constructor: d(MapIterator),
+	_resolve: d(function (i) {
+		if (this.__kind__ === 'value') return this.__values__[i];
+		if (this.__kind__ === 'key') return this.__list__[i];
+		return [this.__list__[i], this.__values__[i]];
+	}),
+	_unBind: d(function () {
+		this.__values__ = null;
+		unBind.call(this);
+	}),
+	toString: d(function () { return '[object Map Iterator]'; })
+});
+Object.defineProperty(MapIterator.prototype, toStringTagSymbol,
+	d('c', 'Map Iterator'));
+
+},{"./iterator-kinds":67,"d":15,"es5-ext/object/set-prototype-of":48,"es6-iterator":60,"es6-symbol":70}],69:[function(require,module,exports){
+'use strict';
+
+var clear          = require('es5-ext/array/#/clear')
+  , eIndexOf       = require('es5-ext/array/#/e-index-of')
+  , setPrototypeOf = require('es5-ext/object/set-prototype-of')
+  , callable       = require('es5-ext/object/valid-callable')
+  , validValue     = require('es5-ext/object/valid-value')
+  , d              = require('d')
+  , ee             = require('event-emitter')
+  , Symbol         = require('es6-symbol')
+  , iterator       = require('es6-iterator/valid-iterable')
+  , forOf          = require('es6-iterator/for-of')
+  , Iterator       = require('./lib/iterator')
+  , isNative       = require('./is-native-implemented')
+
+  , call = Function.prototype.call
+  , defineProperties = Object.defineProperties, getPrototypeOf = Object.getPrototypeOf
+  , MapPoly;
+
+module.exports = MapPoly = function (/*iterable*/) {
+	var iterable = arguments[0], keys, values, self;
+	if (!(this instanceof MapPoly)) throw new TypeError('Constructor requires \'new\'');
+	if (isNative && setPrototypeOf && (Map !== MapPoly)) {
+		self = setPrototypeOf(new Map(), getPrototypeOf(this));
+	} else {
+		self = this;
+	}
+	if (iterable != null) iterator(iterable);
+	defineProperties(self, {
+		__mapKeysData__: d('c', keys = []),
+		__mapValuesData__: d('c', values = [])
+	});
+	if (!iterable) return self;
+	forOf(iterable, function (value) {
+		var key = validValue(value)[0];
+		value = value[1];
+		if (eIndexOf.call(keys, key) !== -1) return;
+		keys.push(key);
+		values.push(value);
+	}, self);
+	return self;
+};
+
+if (isNative) {
+	if (setPrototypeOf) setPrototypeOf(MapPoly, Map);
+	MapPoly.prototype = Object.create(Map.prototype, {
+		constructor: d(MapPoly)
+	});
+}
+
+ee(defineProperties(MapPoly.prototype, {
+	clear: d(function () {
+		if (!this.__mapKeysData__.length) return;
+		clear.call(this.__mapKeysData__);
+		clear.call(this.__mapValuesData__);
+		this.emit('_clear');
+	}),
+	delete: d(function (key) {
+		var index = eIndexOf.call(this.__mapKeysData__, key);
+		if (index === -1) return false;
+		this.__mapKeysData__.splice(index, 1);
+		this.__mapValuesData__.splice(index, 1);
+		this.emit('_delete', index, key);
+		return true;
+	}),
+	entries: d(function () { return new Iterator(this, 'key+value'); }),
+	forEach: d(function (cb/*, thisArg*/) {
+		var thisArg = arguments[1], iterator, result;
+		callable(cb);
+		iterator = this.entries();
+		result = iterator._next();
+		while (result !== undefined) {
+			call.call(cb, thisArg, this.__mapValuesData__[result],
+				this.__mapKeysData__[result], this);
+			result = iterator._next();
+		}
+	}),
+	get: d(function (key) {
+		var index = eIndexOf.call(this.__mapKeysData__, key);
+		if (index === -1) return;
+		return this.__mapValuesData__[index];
+	}),
+	has: d(function (key) {
+		return (eIndexOf.call(this.__mapKeysData__, key) !== -1);
+	}),
+	keys: d(function () { return new Iterator(this, 'key'); }),
+	set: d(function (key, value) {
+		var index = eIndexOf.call(this.__mapKeysData__, key), emit;
+		if (index === -1) {
+			index = this.__mapKeysData__.push(key) - 1;
+			emit = true;
+		}
+		this.__mapValuesData__[index] = value;
+		if (emit) this.emit('_add', index, key);
+		return this;
+	}),
+	size: d.gs(function () { return this.__mapKeysData__.length; }),
+	values: d(function () { return new Iterator(this, 'value'); }),
+	toString: d(function () { return '[object Map]'; })
+}));
+Object.defineProperty(MapPoly.prototype, Symbol.iterator, d(function () {
+	return this.entries();
+}));
+Object.defineProperty(MapPoly.prototype, Symbol.toStringTag, d('c', 'Map'));
+
+},{"./is-native-implemented":66,"./lib/iterator":68,"d":15,"es5-ext/array/#/clear":17,"es5-ext/array/#/e-index-of":18,"es5-ext/object/set-prototype-of":48,"es5-ext/object/valid-callable":51,"es5-ext/object/valid-value":52,"es6-iterator/for-of":58,"es6-iterator/valid-iterable":63,"es6-symbol":70,"event-emitter":78}],70:[function(require,module,exports){
+"use strict";
+
+module.exports = require("./is-implemented")()
+	? require("ext/global-this").Symbol
+	: require("./polyfill");
+
+},{"./is-implemented":71,"./polyfill":76,"ext/global-this":81}],71:[function(require,module,exports){
+"use strict";
+
+var global     = require("ext/global-this")
+  , validTypes = { object: true, symbol: true };
+
+module.exports = function () {
+	var Symbol = global.Symbol;
+	var symbol;
+	if (typeof Symbol !== "function") return false;
+	symbol = Symbol("test symbol");
+	try { String(symbol); }
+	catch (e) { return false; }
+
+	// Return 'true' also for polyfills
+	if (!validTypes[typeof Symbol.iterator]) return false;
+	if (!validTypes[typeof Symbol.toPrimitive]) return false;
+	if (!validTypes[typeof Symbol.toStringTag]) return false;
+
+	return true;
+};
+
+},{"ext/global-this":81}],72:[function(require,module,exports){
+"use strict";
+
+module.exports = function (value) {
+	if (!value) return false;
+	if (typeof value === "symbol") return true;
+	if (!value.constructor) return false;
+	if (value.constructor.name !== "Symbol") return false;
+	return value[value.constructor.toStringTag] === "Symbol";
+};
+
+},{}],73:[function(require,module,exports){
+"use strict";
+
+var d = require("d");
+
+var create = Object.create, defineProperty = Object.defineProperty, objPrototype = Object.prototype;
+
+var created = create(null);
+module.exports = function (desc) {
+	var postfix = 0, name, ie11BugWorkaround;
+	while (created[desc + (postfix || "")]) ++postfix;
+	desc += postfix || "";
+	created[desc] = true;
+	name = "@@" + desc;
+	defineProperty(
+		objPrototype,
+		name,
+		d.gs(null, function (value) {
+			// For IE11 issue see:
+			// https://connect.microsoft.com/IE/feedbackdetail/view/1928508/
+			//    ie11-broken-getters-on-dom-objects
+			// https://github.com/medikoo/es6-symbol/issues/12
+			if (ie11BugWorkaround) return;
+			ie11BugWorkaround = true;
+			defineProperty(this, name, d(value));
+			ie11BugWorkaround = false;
+		})
+	);
+	return name;
+};
+
+},{"d":15}],74:[function(require,module,exports){
+"use strict";
+
+var d            = require("d")
+  , NativeSymbol = require("ext/global-this").Symbol;
+
+module.exports = function (SymbolPolyfill) {
+	return Object.defineProperties(SymbolPolyfill, {
+		// To ensure proper interoperability with other native functions (e.g. Array.from)
+		// fallback to eventual native implementation of given symbol
+		hasInstance: d(
+			"", (NativeSymbol && NativeSymbol.hasInstance) || SymbolPolyfill("hasInstance")
+		),
+		isConcatSpreadable: d(
+			"",
+			(NativeSymbol && NativeSymbol.isConcatSpreadable) ||
+				SymbolPolyfill("isConcatSpreadable")
+		),
+		iterator: d("", (NativeSymbol && NativeSymbol.iterator) || SymbolPolyfill("iterator")),
+		match: d("", (NativeSymbol && NativeSymbol.match) || SymbolPolyfill("match")),
+		replace: d("", (NativeSymbol && NativeSymbol.replace) || SymbolPolyfill("replace")),
+		search: d("", (NativeSymbol && NativeSymbol.search) || SymbolPolyfill("search")),
+		species: d("", (NativeSymbol && NativeSymbol.species) || SymbolPolyfill("species")),
+		split: d("", (NativeSymbol && NativeSymbol.split) || SymbolPolyfill("split")),
+		toPrimitive: d(
+			"", (NativeSymbol && NativeSymbol.toPrimitive) || SymbolPolyfill("toPrimitive")
+		),
+		toStringTag: d(
+			"", (NativeSymbol && NativeSymbol.toStringTag) || SymbolPolyfill("toStringTag")
+		),
+		unscopables: d(
+			"", (NativeSymbol && NativeSymbol.unscopables) || SymbolPolyfill("unscopables")
+		)
+	});
+};
+
+},{"d":15,"ext/global-this":81}],75:[function(require,module,exports){
+"use strict";
+
+var d              = require("d")
+  , validateSymbol = require("../../../validate-symbol");
+
+var registry = Object.create(null);
+
+module.exports = function (SymbolPolyfill) {
+	return Object.defineProperties(SymbolPolyfill, {
+		for: d(function (key) {
+			if (registry[key]) return registry[key];
+			return (registry[key] = SymbolPolyfill(String(key)));
+		}),
+		keyFor: d(function (symbol) {
+			var key;
+			validateSymbol(symbol);
+			for (key in registry) {
+				if (registry[key] === symbol) return key;
+			}
+			return undefined;
+		})
+	});
+};
+
+},{"../../../validate-symbol":77,"d":15}],76:[function(require,module,exports){
+// ES2015 Symbol polyfill for environments that do not (or partially) support it
+
+"use strict";
+
+var d                    = require("d")
+  , validateSymbol       = require("./validate-symbol")
+  , NativeSymbol         = require("ext/global-this").Symbol
+  , generateName         = require("./lib/private/generate-name")
+  , setupStandardSymbols = require("./lib/private/setup/standard-symbols")
+  , setupSymbolRegistry  = require("./lib/private/setup/symbol-registry");
+
+var create = Object.create
+  , defineProperties = Object.defineProperties
+  , defineProperty = Object.defineProperty;
+
+var SymbolPolyfill, HiddenSymbol, isNativeSafe;
+
+if (typeof NativeSymbol === "function") {
+	try {
+		String(NativeSymbol());
+		isNativeSafe = true;
+	} catch (ignore) {}
+} else {
+	NativeSymbol = null;
+}
+
+// Internal constructor (not one exposed) for creating Symbol instances.
+// This one is used to ensure that `someSymbol instanceof Symbol` always return false
+HiddenSymbol = function Symbol(description) {
+	if (this instanceof HiddenSymbol) throw new TypeError("Symbol is not a constructor");
+	return SymbolPolyfill(description);
+};
+
+// Exposed `Symbol` constructor
+// (returns instances of HiddenSymbol)
+module.exports = SymbolPolyfill = function Symbol(description) {
+	var symbol;
+	if (this instanceof Symbol) throw new TypeError("Symbol is not a constructor");
+	if (isNativeSafe) return NativeSymbol(description);
+	symbol = create(HiddenSymbol.prototype);
+	description = description === undefined ? "" : String(description);
+	return defineProperties(symbol, {
+		__description__: d("", description),
+		__name__: d("", generateName(description))
+	});
+};
+
+setupStandardSymbols(SymbolPolyfill);
+setupSymbolRegistry(SymbolPolyfill);
+
+// Internal tweaks for real symbol producer
+defineProperties(HiddenSymbol.prototype, {
+	constructor: d(SymbolPolyfill),
+	toString: d("", function () { return this.__name__; })
+});
+
+// Proper implementation of methods exposed on Symbol.prototype
+// They won't be accessible on produced symbol instances as they derive from HiddenSymbol.prototype
+defineProperties(SymbolPolyfill.prototype, {
+	toString: d(function () { return "Symbol (" + validateSymbol(this).__description__ + ")"; }),
+	valueOf: d(function () { return validateSymbol(this); })
+});
+defineProperty(
+	SymbolPolyfill.prototype,
+	SymbolPolyfill.toPrimitive,
+	d("", function () {
+		var symbol = validateSymbol(this);
+		if (typeof symbol === "symbol") return symbol;
+		return symbol.toString();
+	})
+);
+defineProperty(SymbolPolyfill.prototype, SymbolPolyfill.toStringTag, d("c", "Symbol"));
+
+// Proper implementaton of toPrimitive and toStringTag for returned symbol instances
+defineProperty(
+	HiddenSymbol.prototype, SymbolPolyfill.toStringTag,
+	d("c", SymbolPolyfill.prototype[SymbolPolyfill.toStringTag])
+);
+
+// Note: It's important to define `toPrimitive` as last one, as some implementations
+// implement `toPrimitive` natively without implementing `toStringTag` (or other specified symbols)
+// And that may invoke error in definition flow:
+// See: https://github.com/medikoo/es6-symbol/issues/13#issuecomment-164146149
+defineProperty(
+	HiddenSymbol.prototype, SymbolPolyfill.toPrimitive,
+	d("c", SymbolPolyfill.prototype[SymbolPolyfill.toPrimitive])
+);
+
+},{"./lib/private/generate-name":73,"./lib/private/setup/standard-symbols":74,"./lib/private/setup/symbol-registry":75,"./validate-symbol":77,"d":15,"ext/global-this":81}],77:[function(require,module,exports){
+"use strict";
+
+var isSymbol = require("./is-symbol");
+
+module.exports = function (value) {
+	if (!isSymbol(value)) throw new TypeError(value + " is not a symbol");
+	return value;
+};
+
+},{"./is-symbol":72}],78:[function(require,module,exports){
+'use strict';
+
+var d        = require('d')
+  , callable = require('es5-ext/object/valid-callable')
+
+  , apply = Function.prototype.apply, call = Function.prototype.call
+  , create = Object.create, defineProperty = Object.defineProperty
+  , defineProperties = Object.defineProperties
+  , hasOwnProperty = Object.prototype.hasOwnProperty
+  , descriptor = { configurable: true, enumerable: false, writable: true }
+
+  , on, once, off, emit, methods, descriptors, base;
+
+on = function (type, listener) {
+	var data;
+
+	callable(listener);
+
+	if (!hasOwnProperty.call(this, '__ee__')) {
+		data = descriptor.value = create(null);
+		defineProperty(this, '__ee__', descriptor);
+		descriptor.value = null;
+	} else {
+		data = this.__ee__;
+	}
+	if (!data[type]) data[type] = listener;
+	else if (typeof data[type] === 'object') data[type].push(listener);
+	else data[type] = [data[type], listener];
+
+	return this;
+};
+
+once = function (type, listener) {
+	var once, self;
+
+	callable(listener);
+	self = this;
+	on.call(this, type, once = function () {
+		off.call(self, type, once);
+		apply.call(listener, this, arguments);
+	});
+
+	once.__eeOnceListener__ = listener;
+	return this;
+};
+
+off = function (type, listener) {
+	var data, listeners, candidate, i;
+
+	callable(listener);
+
+	if (!hasOwnProperty.call(this, '__ee__')) return this;
+	data = this.__ee__;
+	if (!data[type]) return this;
+	listeners = data[type];
+
+	if (typeof listeners === 'object') {
+		for (i = 0; (candidate = listeners[i]); ++i) {
+			if ((candidate === listener) ||
+					(candidate.__eeOnceListener__ === listener)) {
+				if (listeners.length === 2) data[type] = listeners[i ? 0 : 1];
+				else listeners.splice(i, 1);
+			}
+		}
+	} else {
+		if ((listeners === listener) ||
+				(listeners.__eeOnceListener__ === listener)) {
+			delete data[type];
+		}
+	}
+
+	return this;
+};
+
+emit = function (type) {
+	var i, l, listener, listeners, args;
+
+	if (!hasOwnProperty.call(this, '__ee__')) return;
+	listeners = this.__ee__[type];
+	if (!listeners) return;
+
+	if (typeof listeners === 'object') {
+		l = arguments.length;
+		args = new Array(l - 1);
+		for (i = 1; i < l; ++i) args[i - 1] = arguments[i];
+
+		listeners = listeners.slice();
+		for (i = 0; (listener = listeners[i]); ++i) {
+			apply.call(listener, this, args);
+		}
+	} else {
+		switch (arguments.length) {
+		case 1:
+			call.call(listeners, this);
+			break;
+		case 2:
+			call.call(listeners, this, arguments[1]);
+			break;
+		case 3:
+			call.call(listeners, this, arguments[1], arguments[2]);
+			break;
+		default:
+			l = arguments.length;
+			args = new Array(l - 1);
+			for (i = 1; i < l; ++i) {
+				args[i - 1] = arguments[i];
+			}
+			apply.call(listeners, this, args);
+		}
+	}
+};
+
+methods = {
+	on: on,
+	once: once,
+	off: off,
+	emit: emit
+};
+
+descriptors = {
+	on: d(on),
+	once: d(once),
+	off: d(off),
+	emit: d(emit)
+};
+
+base = defineProperties({}, descriptors);
+
+module.exports = exports = function (o) {
+	return (o == null) ? create(base) : defineProperties(Object(o), descriptors);
+};
+exports.methods = methods;
+
+},{"d":15,"es5-ext/object/valid-callable":51}],79:[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);
+  };
+}
+
+},{}],80:[function(require,module,exports){
+var naiveFallback = function () {
+	if (typeof self === "object" && self) return self;
+	if (typeof window === "object" && window) return window;
+	throw new Error("Unable to resolve global `this`");
+};
+
+module.exports = (function () {
+	if (this) return this;
+
+	// Unexpected strict mode (may happen if e.g. bundled into ESM module)
+
+	// Thanks @mathiasbynens -> https://mathiasbynens.be/notes/globalthis
+	// In all ES5+ engines global object inherits from Object.prototype
+	// (if you approached one that doesn't please report)
+	try {
+		Object.defineProperty(Object.prototype, "__global__", {
+			get: function () { return this; },
+			configurable: true
+		});
+	} catch (error) {
+		// Unfortunate case of Object.prototype being sealed (via preventExtensions, seal or freeze)
+		return naiveFallback();
+	}
+	try {
+		// Safari case (window.__global__ is resolved with global context, but __global__ does not)
+		if (!__global__) return naiveFallback();
+		return __global__;
+	} finally {
+		delete Object.prototype.__global__;
+	}
+})();
+
+},{}],81:[function(require,module,exports){
+"use strict";
+
+module.exports = require("./is-implemented")() ? globalThis : require("./implementation");
+
+},{"./implementation":80,"./is-implemented":82}],82:[function(require,module,exports){
+"use strict";
+
+module.exports = function () {
+	if (typeof globalThis !== "object") return false;
+	if (!globalThis) return false;
+	return globalThis.Array === Array;
+};
+
+},{}],83:[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
+}
+
+},{}],84:[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
+    }
+  }
+}
+
+},{}],85:[function(require,module,exports){
+/*!
+ * Determine if an object is a Buffer
+ *
+ * @author   Feross Aboukhadijeh <https://feross.org>
+ * @license  MIT
+ */
+
+// The _isBuffer check is for Safari 5-7 support, because it's missing
+// Object.prototype.constructor. Remove this eventually
+module.exports = function (obj) {
+  return obj != null && (isBuffer(obj) || isSlowBuffer(obj) || !!obj._isBuffer)
+}
+
+function isBuffer (obj) {
+  return !!obj.constructor && typeof obj.constructor.isBuffer === 'function' && obj.constructor.isBuffer(obj)
+}
+
+// For Node v0.10 support. Remove this eventually.
+function isSlowBuffer (obj) {
+  return typeof obj.readFloatLE === 'function' && typeof obj.slice === 'function' && isBuffer(obj.slice(0, 0))
+}
+
+},{}],86:[function(require,module,exports){
+var toString = {}.toString;
+
+module.exports = Array.isArray || function (arr) {
+  return toString.call(arr) == '[object Array]';
+};
+
+},{}],87:[function(require,module,exports){
+'use strict'
+
+var Buffer = require('safe-buffer').Buffer
+
+/* Protocol - protocol constants */
+var 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: 'reserved'
+}
+
+/* Mnemonic => Command code */
+protocol.codes = {}
+for (var k in protocol.types) {
+  var 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.LENGTH_MASK = 0x7F
+protocol.LENGTH_FIN_MASK = 0x80
+
+/* 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])
+
+function genHeader (type) {
+  return [0, 1, 2].map(function (qos) {
+    return [0, 1].map(function (dup) {
+      return [0, 1].map(function (retain) {
+        var buf = new Buffer(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')
+
+/* 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])
+
+/* QoS */
+protocol.QOS = [0, 1, 2].map(function (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])
+}
+
+},{"safe-buffer":114}],88:[function(require,module,exports){
+'use strict'
+
+var Buffer = require('safe-buffer').Buffer
+var writeToStream = require('./writeToStream')
+var EE = require('events').EventEmitter
+var inherits = require('inherits')
+
+function generate (packet) {
+  var stream = new Accumulator()
+  writeToStream(packet, stream)
+  return stream.concat()
+}
+
+function Accumulator () {
+  this._array = new Array(20)
+  this._i = 0
+}
+
+inherits(Accumulator, EE)
+
+Accumulator.prototype.write = function (chunk) {
+  this._array[this._i++] = chunk
+  return true
+}
+
+Accumulator.prototype.concat = function () {
+  var length = 0
+  var lengths = new Array(this._array.length)
+  var list = this._array
+  var pos = 0
+  var i
+  var result
+
+  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]
+  }
+
+  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
+
+},{"./writeToStream":93,"events":79,"inherits":84,"safe-buffer":114}],89:[function(require,module,exports){
+'use strict'
+
+exports.parser = require('./parser')
+exports.generate = require('./generate')
+exports.writeToStream = require('./writeToStream')
+
+},{"./generate":88,"./parser":92,"./writeToStream":93}],90:[function(require,module,exports){
+'use strict'
+
+var Buffer = require('safe-buffer').Buffer
+var max = 65536
+var cache = {}
+
+function generateBuffer (i) {
+  var buffer = Buffer.allocUnsafe(2)
+  buffer.writeUInt8(i >> 8, 0)
+  buffer.writeUInt8(i & 0x00FF, 0 + 1)
+
+  return buffer
+}
+
+function generateCache () {
+  for (var i = 0; i < max; i++) {
+    cache[i] = generateBuffer(i)
+  }
+}
+
+module.exports = {
+  cache: cache,
+  generateCache: generateCache,
+  generateNumber: generateBuffer
+}
+
+},{"safe-buffer":114}],91:[function(require,module,exports){
+
+function Packet () {
+  this.cmd = null
+  this.retain = false
+  this.qos = 0
+  this.dup = false
+  this.length = -1
+  this.topic = null
+  this.payload = null
+}
+
+module.exports = Packet
+
+},{}],92:[function(require,module,exports){
+'use strict'
+
+var bl = require('bl')
+var inherits = require('inherits')
+var EE = require('events').EventEmitter
+var Packet = require('./packet')
+var constants = require('./constants')
+
+function Parser () {
+  if (!(this instanceof Parser)) return new Parser()
+
+  this._states = [
+    '_parseHeader',
+    '_parseLength',
+    '_parsePayload',
+    '_newPacket'
+  ]
+
+  this._resetState()
+}
+
+inherits(Parser, EE)
+
+Parser.prototype._resetState = function () {
+  this.packet = new Packet()
+  this.error = null
+  this._list = bl()
+  this._stateCounter = 0
+}
+
+Parser.prototype.parse = function (buf) {
+  if (this.error) this._resetState()
+
+  this._list.append(buf)
+
+  while ((this.packet.length !== -1 || this._list.length > 0) &&
+         this[this._states[this._stateCounter]]() &&
+         !this.error) {
+    this._stateCounter++
+
+    if (this._stateCounter >= this._states.length) this._stateCounter = 0
+  }
+
+  return this._list.length
+}
+
+Parser.prototype._parseHeader = function () {
+  // There is at least one byte in the buffer
+  var 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
+
+  this._list.consume(1)
+
+  return true
+}
+
+Parser.prototype._parseLength = function () {
+  // There is at least one byte in the list
+  var bytes = 0
+  var mul = 1
+  var length = 0
+  var result = true
+  var current
+
+  while (bytes < 5) {
+    current = this._list.readUInt8(bytes++)
+    length += mul * (current & constants.LENGTH_MASK)
+    mul *= 0x80
+
+    if ((current & constants.LENGTH_FIN_MASK) === 0) break
+    if (this._list.length <= bytes) {
+      result = false
+      break
+    }
+  }
+
+  if (result) {
+    this.packet.length = length
+    this._list.consume(bytes)
+  }
+
+  return result
+}
+
+Parser.prototype._parsePayload = function () {
+  var 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._parseMessageId()
+        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':
+      case 'disconnect':
+        // These are empty, nothing to do
+        break
+      default:
+        this._emitError(new Error('Not supported'))
+    }
+
+    result = true
+  }
+
+  return result
+}
+
+Parser.prototype._parseConnect = function () {
+  var protocolId // Protocol ID
+  var clientId // Client ID
+  var topic // Will topic
+  var payload // Will payload
+  var password // Password
+  var username // Username
+  var flags = {}
+  var packet = this.packet
+
+  // Parse protocolId
+  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 !== 3 && packet.protocolVersion !== 4) {
+    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 clientId
+  clientId = this._parseString()
+  if (clientId === null) return this._emitError(new Error('Packet too short'))
+  packet.clientId = clientId
+
+  if (flags.will) {
+    // Parse will topic
+    topic = this._parseString()
+    if (topic === null) return this._emitError(new Error('Cannot parse will topic'))
+    packet.will.topic = topic
+
+    // Parse will payload
+    payload = this._parseBuffer()
+    if (payload === null) return this._emitError(new Error('Cannot parse will payload'))
+    packet.will.payload = payload
+  }
+
+  // Parse username
+  if (flags.username) {
+    username = this._parseString()
+    if (username === null) return this._emitError(new Error('Cannot parse username'))
+    packet.username = username
+  }
+
+  // Parse password
+  if (flags.password) {
+    password = this._parseBuffer()
+    if (password === null) return this._emitError(new Error('Cannot parse password'))
+    packet.password = password
+  }
+
+  return packet
+}
+
+Parser.prototype._parseConnack = function () {
+  var packet = this.packet
+
+  if (this._list.length < 2) return null
+
+  packet.sessionPresent = !!(this._list.readUInt8(this._pos++) & constants.SESSIONPRESENT_MASK)
+  packet.returnCode = this._list.readUInt8(this._pos)
+
+  if (packet.returnCode === -1) return this._emitError(new Error('Cannot parse return code'))
+}
+
+Parser.prototype._parsePublish = function () {
+  var 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 }
+
+  packet.payload = this._list.slice(this._pos, packet.length)
+}
+
+Parser.prototype._parseSubscribe = function () {
+  var packet = this.packet
+  var topic
+  var qos
+
+  if (packet.qos !== 1) {
+    return this._emitError(new Error('Wrong subscribe header'))
+  }
+
+  packet.subscriptions = []
+
+  if (!this._parseMessageId()) { return }
+
+  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'))
+    qos = this._list.readUInt8(this._pos++)
+
+    // Push pair to subscriptions
+    packet.subscriptions.push({ topic: topic, qos: qos })
+  }
+}
+
+Parser.prototype._parseSuback = function () {
+  this.packet.granted = []
+
+  if (!this._parseMessageId()) { return }
+
+  // Parse granted QoSes
+  while (this._pos < this.packet.length) {
+    this.packet.granted.push(this._list.readUInt8(this._pos++))
+  }
+}
+
+Parser.prototype._parseUnsubscribe = function () {
+  var packet = this.packet
+
+  packet.unsubscriptions = []
+
+  // Parse messageId
+  if (!this._parseMessageId()) { return }
+
+  while (this._pos < packet.length) {
+    var topic
+
+    // Parse topic
+    topic = this._parseString()
+    if (topic === null) return this._emitError(new Error('Cannot parse topic'))
+
+    // Push topic to unsubscriptions
+    packet.unsubscriptions.push(topic)
+  }
+}
+
+Parser.prototype._parseUnsuback = function () {
+  if (!this._parseMessageId()) return this._emitError(new Error('Cannot parse messageId'))
+}
+
+Parser.prototype._parseMessageId = function () {
+  var packet = this.packet
+
+  packet.messageId = this._parseNum()
+
+  if (packet.messageId === null) {
+    this._emitError(new Error('Cannot parse messageId'))
+    return false
+  }
+
+  return true
+}
+
+Parser.prototype._parseString = function (maybeBuffer) {
+  var length = this._parseNum()
+  var result
+  var end = length + this._pos
+
+  if (length === -1 || end > this._list.length || end > this.packet.length) return null
+
+  result = this._list.toString('utf8', this._pos, end)
+  this._pos += length
+
+  return result
+}
+
+Parser.prototype._parseBuffer = function () {
+  var length = this._parseNum()
+  var result
+  var end = length + this._pos
+
+  if (length === -1 || end > this._list.length || end > this.packet.length) return null
+
+  result = this._list.slice(this._pos, end)
+
+  this._pos += length
+
+  return result
+}
+
+Parser.prototype._parseNum = function () {
+  if (this._list.length - this._pos < 2) return -1
+
+  var result = this._list.readUInt16BE(this._pos)
+  this._pos += 2
+
+  return result
+}
+
+Parser.prototype._newPacket = function () {
+  if (this.packet) {
+    this._list.consume(this.packet.length)
+    this.emit('packet', this.packet)
+  }
+
+  this.packet = new Packet()
+
+  return true
+}
+
+Parser.prototype._emitError = function (err) {
+  this.error = err
+  this.emit('error', err)
+}
+
+module.exports = Parser
+
+},{"./constants":87,"./packet":91,"bl":10,"events":79,"inherits":84}],93:[function(require,module,exports){
+'use strict'
+
+var protocol = require('./constants')
+var Buffer = require('safe-buffer').Buffer
+var empty = Buffer.allocUnsafe(0)
+var zeroBuf = Buffer.from([0])
+var numbers = require('./numbers')
+var nextTick = require('process-nextick-args').nextTick
+
+var numCache = numbers.cache
+var generateNumber = numbers.generateNumber
+var generateCache = numbers.generateCache
+var writeNumber = writeNumberCached
+var toGenerate = true
+
+function generate (packet, stream) {
+  if (stream.cork) {
+    stream.cork()
+    nextTick(uncork, stream)
+  }
+
+  if (toGenerate) {
+    toGenerate = false
+    generateCache()
+  }
+
+  switch (packet.cmd) {
+    case 'connect':
+      return connect(packet, stream)
+    case 'connack':
+      return connack(packet, stream)
+    case 'publish':
+      return publish(packet, stream)
+    case 'puback':
+    case 'pubrec':
+    case 'pubrel':
+    case 'pubcomp':
+    case 'unsuback':
+      return confirmation(packet, stream)
+    case 'subscribe':
+      return subscribe(packet, stream)
+    case 'suback':
+      return suback(packet, stream)
+    case 'unsubscribe':
+      return unsubscribe(packet, stream)
+    case 'pingreq':
+    case 'pingresp':
+    case 'disconnect':
+      return emptyPacket(packet, stream)
+    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: function () {
+    return writeNumber === writeNumberCached
+  },
+  set: function (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 (opts, stream) {
+  var settings = opts || {}
+  var protocolId = settings.protocolId || 'MQTT'
+  var protocolVersion = settings.protocolVersion || 4
+  var will = settings.will
+  var clean = settings.clean
+  var keepalive = settings.keepalive || 0
+  var clientId = settings.clientId || ''
+  var username = settings.username
+  var password = settings.password
+
+  if (clean === undefined) clean = true
+
+  var 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
+  if (protocolVersion !== 3 && protocolVersion !== 4) {
+    stream.emit('error', new Error('Invalid protocol version'))
+    return false
+  } else length += 1
+
+  // ClientId might be omitted in 3.1.1, but only if cleanSession is set to 1
+  if ((typeof clientId === 'string' || Buffer.isBuffer(clientId)) &&
+     (clientId || protocolVersion === 4) && (clientId || clean)) {
+    length += clientId.length + 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
+
+  // 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
+    if (will.payload && will.payload) {
+      if (will.payload.length >= 0) {
+        if (typeof will.payload === 'string') {
+          length += Buffer.byteLength(will.payload) + 2
+        } else {
+          length += will.payload.length + 2
+        }
+      } else {
+        stream.emit('error', new Error('Invalid will payload'))
+        return false
+      }
+    } else {
+      length += 2
+    }
+  }
+
+  // Username
+  var 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
+  writeLength(stream, length)
+
+  // Generate protocol ID
+  writeStringOrBuffer(stream, protocolId)
+  stream.write(
+    protocolVersion === 4 ? protocol.VERSION4 : protocol.VERSION3
+  )
+
+  // Connect flags
+  var 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)
+
+  // Client ID
+  writeStringOrBuffer(stream, clientId)
+
+  // Will
+  if (will) {
+    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 (opts, stream) {
+  var settings = opts || {}
+  var rc = settings.returnCode
+
+  // Check return code
+  if (typeof rc !== 'number') {
+    stream.emit('error', new Error('Invalid return code'))
+    return false
+  }
+
+  stream.write(protocol.CONNACK_HEADER)
+  writeLength(stream, 2)
+  stream.write(opts.sessionPresent ? protocol.SESSIONPRESENT_HEADER : zeroBuf)
+
+  return stream.write(Buffer.from([rc]))
+}
+
+function publish (opts, stream) {
+  var settings = opts || {}
+  var qos = settings.qos || 0
+  var retain = settings.retain ? protocol.RETAIN_MASK : 0
+  var topic = settings.topic
+  var payload = settings.payload || empty
+  var id = settings.messageId
+
+  var 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
+
+  // Header
+  stream.write(protocol.PUBLISH_HEADER[qos][opts.dup ? 1 : 0][retain ? 1 : 0])
+
+  // Remaining length
+  writeLength(stream, length)
+
+  // Topic
+  writeNumber(stream, byteLength(topic))
+  stream.write(topic)
+
+  // Message ID
+  if (qos > 0) writeNumber(stream, id)
+
+  // Payload
+  return stream.write(payload)
+}
+
+/* Puback, pubrec, pubrel and pubcomp */
+function confirmation (opts, stream) {
+  var settings = opts || {}
+  var type = settings.cmd || 'puback'
+  var id = settings.messageId
+  var dup = (settings.dup && type === 'pubrel') ? protocol.DUP_MASK : 0
+  var qos = 0
+
+  if (type === 'pubrel') qos = 1
+
+  // Check message ID
+  if (typeof id !== 'number') {
+    stream.emit('error', new Error('Invalid messageId'))
+    return false
+  }
+
+  // Header
+  stream.write(protocol.ACKS[type][qos][dup][0])
+
+  // Length
+  writeLength(stream, 2)
+
+  // Message ID
+  return writeNumber(stream, id)
+}
+
+function subscribe (opts, stream) {
+  var settings = opts || {}
+  var dup = settings.dup ? protocol.DUP_MASK : 0
+  var id = settings.messageId
+  var subs = settings.subscriptions
+
+  var length = 0
+
+  // Check message ID
+  if (typeof id !== 'number') {
+    stream.emit('error', new Error('Invalid messageId'))
+    return false
+  } else length += 2
+
+  // Check subscriptions
+  if (typeof subs === 'object' && subs.length) {
+    for (var i = 0; i < subs.length; i += 1) {
+      var itopic = subs[i].topic
+      var 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
+      }
+
+      length += Buffer.byteLength(itopic) + 2 + 1
+    }
+  } else {
+    stream.emit('error', new Error('Invalid subscriptions'))
+    return false
+  }
+
+  // Generate header
+  stream.write(protocol.SUBSCRIBE_HEADER[1][dup ? 1 : 0][0])
+
+  // Generate length
+  writeLength(stream, length)
+
+  // Generate message ID
+  writeNumber(stream, id)
+
+  var result = true
+
+  // Generate subs
+  for (var j = 0; j < subs.length; j++) {
+    var sub = subs[j]
+    var jtopic = sub.topic
+    var jqos = sub.qos
+
+    // Write topic string
+    writeString(stream, jtopic)
+
+    // Write qos
+    result = stream.write(protocol.QOS[jqos])
+  }
+
+  return result
+}
+
+function suback (opts, stream) {
+  var settings = opts || {}
+  var id = settings.messageId
+  var granted = settings.granted
+
+  var 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 (var 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
+  }
+
+  // header
+  stream.write(protocol.SUBACK_HEADER)
+
+  // Length
+  writeLength(stream, length)
+
+  // Message ID
+  writeNumber(stream, id)
+
+  return stream.write(Buffer.from(granted))
+}
+
+function unsubscribe (opts, stream) {
+  var settings = opts || {}
+  var id = settings.messageId
+  var dup = settings.dup ? protocol.DUP_MASK : 0
+  var unsubs = settings.unsubscriptions
+
+  var 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 (var 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
+  }
+
+  // Header
+  stream.write(protocol.UNSUBSCRIBE_HEADER[1][dup ? 1 : 0][0])
+
+  // Length
+  writeLength(stream, length)
+
+  // Message ID
+  writeNumber(stream, id)
+
+  // Unsubs
+  var result = true
+  for (var j = 0; j < unsubs.length; j++) {
+    result = writeString(stream, unsubs[j])
+  }
+
+  return result
+}
+
+function emptyPacket (opts, stream) {
+  return stream.write(protocol.EMPTY[opts.cmd])
+}
+
+/**
+ * calcLengthLength - calculate the length of the remaining
+ * length field
+ *
+ * @api private
+ */
+function calcLengthLength (length) {
+  if (length >= 0 && length < 128) return 1
+  else if (length >= 128 && length < 16384) return 2
+  else if (length >= 16384 && length < 2097152) return 3
+  else if (length >= 2097152 && length < 268435456) return 4
+  else return 0
+}
+
+function genBufLength (length) {
+  var digit = 0
+  var pos = 0
+  var buffer = Buffer.allocUnsafe(calcLengthLength(length))
+
+  do {
+    digit = length % 128 | 0
+    length = length / 128 | 0
+    if (length > 0) digit = digit | 0x80
+
+    buffer.writeUInt8(digit, pos++)
+  } while (length > 0)
+
+  return buffer
+}
+
+/**
+ * writeLength - write an MQTT style length field to the buffer
+ *
+ * @param <Buffer> buffer - destination
+ * @param <Number> pos - offset
+ * @param <Number> length - length (>0)
+ * @returns <Number> number of bytes written
+ *
+ * @api private
+ */
+
+var lengthCache = {}
+function writeLength (stream, length) {
+  var buffer = lengthCache[length]
+
+  if (!buffer) {
+    buffer = genBufLength(length)
+    if (length < 16384) lengthCache[length] = buffer
+  }
+
+  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) {
+  var strlen = Buffer.byteLength(string)
+  writeNumber(stream, strlen)
+
+  stream.write(string, 'utf8')
+}
+
+/**
+ * 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) {
+  return stream.write(numCache[number])
+}
+function writeNumberGenerated (stream, number) {
+  return stream.write(generateNumber(number))
+}
+
+/**
+ * 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 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
+
+},{"./constants":87,"./numbers":90,"process-nextick-args":95,"safe-buffer":114}],94:[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":164}],95:[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":96}],96:[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; };
+
+},{}],97:[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 : {})
+},{}],98:[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]';
+};
+
+},{}],99:[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;
+};
+
+},{}],100:[function(require,module,exports){
+'use strict';
+
+exports.decode = exports.parse = require('./decode');
+exports.encode = exports.stringify = require('./encode');
+
+},{"./decode":98,"./encode":99}],101:[function(require,module,exports){
+module.exports = require('./lib/_stream_duplex.js');
+
+},{"./lib/_stream_duplex.js":102}],102:[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 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 pna = require('process-nextick-args');
+/*</replacement>*/
+
+/*<replacement>*/
+var objectKeys = Object.keys || function (obj) {
+  var keys = [];
+  for (var key in obj) {
+    keys.push(key);
+  }return keys;
+};
+/*</replacement>*/
+
+module.exports = Duplex;
+
+/*<replacement>*/
+var util = Object.create(require('core-util-is'));
+util.inherits = require('inherits');
+/*</replacement>*/
+
+var Readable = require('./_stream_readable');
+var Writable = require('./_stream_writable');
+
+util.inherits(Duplex, Readable);
+
+{
+  // avoid scope creep, the keys array can then be collected
+  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);
+
+  if (options && options.readable === false) this.readable = false;
+
+  if (options && options.writable === false) this.writable = false;
+
+  this.allowHalfOpen = true;
+  if (options && 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 () {
+    return this._writableState.highWaterMark;
+  }
+});
+
+// the no-half-open enforcer
+function onend() {
+  // if we allow half-open state, or if the writable side ended,
+  // then we're ok.
+  if (this.allowHalfOpen || this._writableState.ended) return;
+
+  // no more data can be written.
+  // But allow more writes to happen in this tick.
+  pna.nextTick(onEndNT, this);
+}
+
+function onEndNT(self) {
+  self.end();
+}
+
+Object.defineProperty(Duplex.prototype, 'destroyed', {
+  get: function () {
+    if (this._readableState === undefined || this._writableState === undefined) {
+      return false;
+    }
+    return this._readableState.destroyed && this._writableState.destroyed;
+  },
+  set: function (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;
+  }
+});
+
+Duplex.prototype._destroy = function (err, cb) {
+  this.push(null);
+  this.end();
+
+  pna.nextTick(cb, err);
+};
+},{"./_stream_readable":104,"./_stream_writable":106,"core-util-is":13,"inherits":84,"process-nextick-args":95}],103:[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');
+
+/*<replacement>*/
+var util = Object.create(require('core-util-is'));
+util.inherits = require('inherits');
+/*</replacement>*/
+
+util.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":105,"core-util-is":13,"inherits":84}],104:[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';
+
+/*<replacement>*/
+
+var pna = require('process-nextick-args');
+/*</replacement>*/
+
+module.exports = Readable;
+
+/*<replacement>*/
+var isArray = require('isarray');
+/*</replacement>*/
+
+/*<replacement>*/
+var Duplex;
+/*</replacement>*/
+
+Readable.ReadableState = ReadableState;
+
+/*<replacement>*/
+var EE = require('events').EventEmitter;
+
+var EElistenerCount = function (emitter, type) {
+  return emitter.listeners(type).length;
+};
+/*</replacement>*/
+
+/*<replacement>*/
+var Stream = require('./internal/streams/stream');
+/*</replacement>*/
+
+/*<replacement>*/
+
+var Buffer = require('safe-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>*/
+
+/*<replacement>*/
+var util = Object.create(require('core-util-is'));
+util.inherits = require('inherits');
+/*</replacement>*/
+
+/*<replacement>*/
+var debugUtil = require('util');
+var debug = void 0;
+if (debugUtil && debugUtil.debuglog) {
+  debug = debugUtil.debuglog('stream');
+} else {
+  debug = function () {};
+}
+/*</replacement>*/
+
+var BufferList = require('./internal/streams/BufferList');
+var destroyImpl = require('./internal/streams/destroy');
+var StringDecoder;
+
+util.inherits(Readable, Stream);
+
+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 (isArray(emitter._events[event])) emitter._events[event].unshift(fn);else emitter._events[event] = [fn, emitter._events[event]];
+}
+
+function ReadableState(options, stream) {
+  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.
+  var 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"
+  var hwm = options.highWaterMark;
+  var readableHwm = options.readableHighWaterMark;
+  var defaultHwm = this.objectMode ? 16 : 16 * 1024;
+
+  if (hwm || hwm === 0) this.highWaterMark = hwm;else if (isDuplex && (readableHwm || readableHwm === 0)) this.highWaterMark = readableHwm;else this.highWaterMark = defaultHwm;
+
+  // cast to ints.
+  this.highWaterMark = Math.floor(this.highWaterMark);
+
+  // 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;
+
+  // 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);
+
+  this._readableState = new ReadableState(options, this);
+
+  // 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', {
+  get: function () {
+    if (this._readableState === undefined) {
+      return false;
+    }
+    return this._readableState.destroyed;
+  },
+  set: function (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) {
+  this.push(null);
+  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) {
+  var state = stream._readableState;
+  if (chunk === null) {
+    state.reading = false;
+    onEofChunk(stream, state);
+  } else {
+    var er;
+    if (!skipChunkCheck) er = chunkInvalid(state, chunk);
+    if (er) {
+      stream.emit('error', 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) stream.emit('error', new Error('stream.unshift() after end event'));else addChunk(stream, state, chunk, true);
+      } else if (state.ended) {
+        stream.emit('error', new Error('stream.push() after EOF'));
+      } 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;
+    }
+  }
+
+  return needMoreData(state);
+}
+
+function addChunk(stream, state, chunk, addToFront) {
+  if (state.flowing && state.length === 0 && !state.sync) {
+    stream.emit('data', chunk);
+    stream.read(0);
+  } 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 TypeError('Invalid non-string/buffer chunk');
+  }
+  return er;
+}
+
+// if it's past the high water mark, we can push in some more.
+// 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.  Also, if the push() triggered a
+// readable event, and the user called read(largeNumber) such that
+// needReadable was set, then we ought to push more, so that another
+// 'readable' event will be triggered.
+function needMoreData(state) {
+  return !state.ended && (state.needReadable || state.length < state.highWaterMark || state.length === 0);
+}
+
+Readable.prototype.isPaused = function () {
+  return this._readableState.flowing === false;
+};
+
+// backwards compatibility.
+Readable.prototype.setEncoding = function (enc) {
+  if (!StringDecoder) StringDecoder = require('string_decoder/').StringDecoder;
+  this._readableState.decoder = new StringDecoder(enc);
+  this._readableState.encoding = enc;
+  return this;
+};
+
+// Don't raise the hwm > 8MB
+var MAX_HWM = 0x800000;
+function computeNewHighWaterMark(n) {
+  if (n >= MAX_HWM) {
+    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.length >= state.highWaterMark || 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 = true;
+    n = 0;
+  } else {
+    state.length -= n;
+  }
+
+  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) {
+  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;
+
+  // emit 'readable' now to make sure it gets picked up.
+  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;
+  state.needReadable = false;
+  if (!state.emittedReadable) {
+    debug('emitReadable', state.flowing);
+    state.emittedReadable = true;
+    if (state.sync) pna.nextTick(emitReadable_, stream);else emitReadable_(stream);
+  }
+}
+
+function emitReadable_(stream) {
+  debug('emit readable');
+  stream.emit('readable');
+  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;
+    pna.nextTick(maybeReadMore_, stream, state);
+  }
+}
+
+function maybeReadMore_(stream, state) {
+  var len = state.length;
+  while (!state.reading && !state.flowing && !state.ended && state.length < state.highWaterMark) {
+    debug('maybeReadMore read 0');
+    stream.read(0);
+    if (len === state.length)
+      // didn't get any data, stop spinning.
+      break;else len = state.length;
+  }
+  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) {
+  this.emit('error', new Error('_read() is not implemented'));
+};
+
+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) pna.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();
+  }
+
+  // If the user pushes more data while we're writing to dest then we'll end up
+  // in ondata again. However, we only want to increase awaitDrain once because
+  // dest will only emit one 'drain' event for the multiple writes.
+  // => Introduce a guard on increasing awaitDrain.
+  var increasedAwaitDrain = false;
+  src.on('data', ondata);
+  function ondata(chunk) {
+    debug('ondata');
+    increasedAwaitDrain = false;
+    var ret = dest.write(chunk);
+    if (false === ret && !increasedAwaitDrain) {
+      // 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', src._readableState.awaitDrain);
+        src._readableState.awaitDrain++;
+        increasedAwaitDrain = true;
+      }
+      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) dest.emit('error', 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 () {
+    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, unpipeInfo);
+    }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);
+
+  if (ev === 'data') {
+    // Start flowing on next tick if stream isn't explicitly paused
+    if (this._readableState.flowing !== false) this.resume();
+  } else if (ev === 'readable') {
+    var state = this._readableState;
+    if (!state.endEmitted && !state.readableListening) {
+      state.readableListening = state.needReadable = true;
+      state.emittedReadable = false;
+      if (!state.reading) {
+        pna.nextTick(nReadingNextTick, this);
+      } else if (state.length) {
+        emitReadable(this);
+      }
+    }
+  }
+
+  return res;
+};
+Readable.prototype.addListener = Readable.prototype.on;
+
+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');
+    state.flowing = true;
+    resume(this, state);
+  }
+  return this;
+};
+
+function resume(stream, state) {
+  if (!state.resumeScheduled) {
+    state.resumeScheduled = true;
+    pna.nextTick(resume_, stream, state);
+  }
+}
+
+function resume_(stream, state) {
+  if (!state.reading) {
+    debug('resume read 0');
+    stream.read(0);
+  }
+
+  state.resumeScheduled = false;
+  state.awaitDrain = 0;
+  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 (false !== this._readableState.flowing) {
+    debug('pause');
+    this._readableState.flowing = false;
+    this.emit('pause');
+  }
+  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 (method) {
+        return function () {
+          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;
+};
+
+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 () {
+    return this._readableState.highWaterMark;
+  }
+});
+
+// exposed for testing purposes only.
+Readable._fromList = fromList;
+
+// 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.head.data;else ret = state.buffer.concat(state.length);
+    state.buffer.clear();
+  } else {
+    // read part of list
+    ret = fromListPartial(n, state.buffer, state.decoder);
+  }
+
+  return ret;
+}
+
+// Extracts only enough buffered data to satisfy the amount requested.
+// This function is designed to be inlinable, so please take care when making
+// changes to the function body.
+function fromListPartial(n, list, hasStrings) {
+  var ret;
+  if (n < list.head.data.length) {
+    // slice is the same for buffers and strings
+    ret = list.head.data.slice(0, n);
+    list.head.data = list.head.data.slice(n);
+  } else if (n === list.head.data.length) {
+    // first chunk is a perfect match
+    ret = list.shift();
+  } else {
+    // result spans more than one buffer
+    ret = hasStrings ? copyFromBufferString(n, list) : copyFromBuffer(n, list);
+  }
+  return ret;
+}
+
+// Copies a specified amount of characters from the list of buffered data
+// chunks.
+// This function is designed to be inlinable, so please take care when making
+// changes to the function body.
+function copyFromBufferString(n, list) {
+  var p = list.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) list.head = p.next;else list.head = list.tail = null;
+      } else {
+        list.head = p;
+        p.data = str.slice(nb);
+      }
+      break;
+    }
+    ++c;
+  }
+  list.length -= c;
+  return ret;
+}
+
+// Copies a specified amount of bytes from the list of buffered data chunks.
+// This function is designed to be inlinable, so please take care when making
+// changes to the function body.
+function copyFromBuffer(n, list) {
+  var ret = Buffer.allocUnsafe(n);
+  var p = list.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) list.head = p.next;else list.head = list.tail = null;
+      } else {
+        list.head = p;
+        p.data = buf.slice(nb);
+      }
+      break;
+    }
+    ++c;
+  }
+  list.length -= c;
+  return ret;
+}
+
+function endReadable(stream) {
+  var state = stream._readableState;
+
+  // If we get here before consuming all the bytes, then that is a
+  // bug in node.  Should never happen.
+  if (state.length > 0) throw new Error('"endReadable()" called on non-empty stream');
+
+  if (!state.endEmitted) {
+    state.ended = true;
+    pna.nextTick(endReadableNT, state, stream);
+  }
+}
+
+function endReadableNT(state, stream) {
+  // Check that we didn't get one last unshift.
+  if (!state.endEmitted && state.length === 0) {
+    state.endEmitted = true;
+    stream.readable = false;
+    stream.emit('end');
+  }
+}
+
+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 : {})
+},{"./_stream_duplex":102,"./internal/streams/BufferList":107,"./internal/streams/destroy":108,"./internal/streams/stream":109,"_process":96,"core-util-is":13,"events":79,"inherits":84,"isarray":86,"process-nextick-args":95,"safe-buffer":110,"string_decoder/":111,"util":11}],105:[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 Duplex = require('./_stream_duplex');
+
+/*<replacement>*/
+var util = Object.create(require('core-util-is'));
+util.inherits = require('inherits');
+/*</replacement>*/
+
+util.inherits(Transform, Duplex);
+
+function afterTransform(er, data) {
+  var ts = this._transformState;
+  ts.transforming = false;
+
+  var cb = ts.writecb;
+
+  if (!cb) {
+    return this.emit('error', new Error('write callback called multiple times'));
+  }
+
+  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._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) {
+  throw new Error('_transform() is not implemented');
+};
+
+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.writecb && !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) {
+  var _this2 = this;
+
+  Duplex.prototype._destroy.call(this, err, function (err2) {
+    cb(err2);
+    _this2.emit('close');
+  });
+};
+
+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);
+
+  // if there's nothing in the write buffer, then that means
+  // that nothing more will ever be provided
+  if (stream._writableState.length) throw new Error('Calling transform done when ws.length != 0');
+
+  if (stream._transformState.transforming) throw new Error('Calling transform done when still transforming');
+
+  return stream.push(null);
+}
+},{"./_stream_duplex":102,"core-util-is":13,"inherits":84}],106:[function(require,module,exports){
+(function (process,global,setImmediate){(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';
+
+/*<replacement>*/
+
+var pna = require('process-nextick-args');
+/*</replacement>*/
+
+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 asyncWrite = !process.browser && ['v0.10', 'v0.9.'].indexOf(process.version.slice(0, 5)) > -1 ? setImmediate : pna.nextTick;
+/*</replacement>*/
+
+/*<replacement>*/
+var Duplex;
+/*</replacement>*/
+
+Writable.WritableState = WritableState;
+
+/*<replacement>*/
+var util = Object.create(require('core-util-is'));
+util.inherits = require('inherits');
+/*</replacement>*/
+
+/*<replacement>*/
+var internalUtil = {
+  deprecate: require('util-deprecate')
+};
+/*</replacement>*/
+
+/*<replacement>*/
+var Stream = require('./internal/streams/stream');
+/*</replacement>*/
+
+/*<replacement>*/
+
+var Buffer = require('safe-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 destroyImpl = require('./internal/streams/destroy');
+
+util.inherits(Writable, Stream);
+
+function nop() {}
+
+function WritableState(options, stream) {
+  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.
+  var 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()
+  var hwm = options.highWaterMark;
+  var writableHwm = options.writableHighWaterMark;
+  var defaultHwm = this.objectMode ? 16 : 16 * 1024;
+
+  if (hwm || hwm === 0) this.highWaterMark = hwm;else if (isDuplex && (writableHwm || writableHwm === 0)) this.highWaterMark = writableHwm;else this.highWaterMark = defaultHwm;
+
+  // cast to ints.
+  this.highWaterMark = Math.floor(this.highWaterMark);
+
+  // 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;
+
+  // 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 () {
+        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 (object) {
+      if (realHasInstance.call(this, object)) return true;
+      if (this !== Writable) return false;
+
+      return object && object._writableState instanceof WritableState;
+    }
+  });
+} else {
+  realHasInstance = function (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.
+  if (!realHasInstance.call(Writable, this) && !(this instanceof Duplex)) {
+    return new Writable(options);
+  }
+
+  this._writableState = new WritableState(options, this);
+
+  // 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 () {
+  this.emit('error', new Error('Cannot pipe, not readable'));
+};
+
+function writeAfterEnd(stream, cb) {
+  var er = new Error('write after end');
+  // TODO: defer error events consistently everywhere, not just the cb
+  stream.emit('error', er);
+  pna.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 valid = true;
+  var er = false;
+
+  if (chunk === null) {
+    er = new TypeError('May not write null values to stream');
+  } else if (typeof chunk !== 'string' && chunk !== undefined && !state.objectMode) {
+    er = new TypeError('Invalid non-string/buffer chunk');
+  }
+  if (er) {
+    stream.emit('error', er);
+    pna.nextTick(cb, er);
+    valid = false;
+  }
+  return valid;
+}
+
+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.ended) 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 () {
+  var state = this._writableState;
+
+  state.corked++;
+};
+
+Writable.prototype.uncork = function () {
+  var state = this._writableState;
+
+  if (state.corked) {
+    state.corked--;
+
+    if (!state.writing && !state.corked && !state.finished && !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 TypeError('Unknown encoding: ' + encoding);
+  this._writableState.defaultEncoding = encoding;
+  return this;
+};
+
+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 () {
+    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 (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
+    pna.nextTick(cb, er);
+    // this can emit finish, and it will always happen
+    // after error
+    pna.nextTick(finishMaybe, stream, state);
+    stream._writableState.errorEmitted = true;
+    stream.emit('error', er);
+  } else {
+    // the caller expect this to happen before if
+    // it is async
+    cb(er);
+    stream._writableState.errorEmitted = true;
+    stream.emit('error', 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;
+
+  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);
+
+    if (!finished && !state.corked && !state.bufferProcessing && state.bufferedRequest) {
+      clearBuffer(stream, state);
+    }
+
+    if (sync) {
+      /*<replacement>*/
+      asyncWrite(afterWrite, stream, state, finished, cb);
+      /*</replacement>*/
+    } 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 Error('_write() is not implemented'));
+};
+
+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 && !state.finished) endWritable(this, state, cb);
+};
+
+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) {
+      stream.emit('error', 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.pendingcb++;
+      state.finalCalled = true;
+      pna.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');
+    }
+  }
+  return need;
+}
+
+function endWritable(stream, state, cb) {
+  state.ending = true;
+  finishMaybe(stream, state);
+  if (cb) {
+    if (state.finished) pna.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;
+  }
+  if (state.corkedRequestsFree) {
+    state.corkedRequestsFree.next = corkReq;
+  } else {
+    state.corkedRequestsFree = corkReq;
+  }
+}
+
+Object.defineProperty(Writable.prototype, 'destroyed', {
+  get: function () {
+    if (this._writableState === undefined) {
+      return false;
+    }
+    return this._writableState.destroyed;
+  },
+  set: function (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) {
+  this.end();
+  cb(err);
+};
+}).call(this)}).call(this,require('_process'),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {},require("timers").setImmediate)
+},{"./_stream_duplex":102,"./internal/streams/destroy":108,"./internal/streams/stream":109,"_process":96,"core-util-is":13,"inherits":84,"process-nextick-args":95,"safe-buffer":110,"timers":116,"util-deprecate":130}],107:[function(require,module,exports){
+'use strict';
+
+function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
+
+var Buffer = require('safe-buffer').Buffer;
+var util = require('util');
+
+function copyBuffer(src, target, offset) {
+  src.copy(target, offset);
+}
+
+module.exports = function () {
+  function BufferList() {
+    _classCallCheck(this, BufferList);
+
+    this.head = null;
+    this.tail = null;
+    this.length = 0;
+  }
+
+  BufferList.prototype.push = 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;
+  };
+
+  BufferList.prototype.unshift = function unshift(v) {
+    var entry = { data: v, next: this.head };
+    if (this.length === 0) this.tail = entry;
+    this.head = entry;
+    ++this.length;
+  };
+
+  BufferList.prototype.shift = 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;
+  };
+
+  BufferList.prototype.clear = function clear() {
+    this.head = this.tail = null;
+    this.length = 0;
+  };
+
+  BufferList.prototype.join = 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;
+  };
+
+  BufferList.prototype.concat = function concat(n) {
+    if (this.length === 0) return Buffer.alloc(0);
+    if (this.length === 1) return this.head.data;
+    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;
+  };
+
+  return BufferList;
+}();
+
+if (util && util.inspect && util.inspect.custom) {
+  module.exports.prototype[util.inspect.custom] = function () {
+    var obj = util.inspect({ length: this.length });
+    return this.constructor.name + ' ' + obj;
+  };
+}
+},{"safe-buffer":110,"util":11}],108:[function(require,module,exports){
+'use strict';
+
+/*<replacement>*/
+
+var pna = require('process-nextick-args');
+/*</replacement>*/
+
+// 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 && (!this._writableState || !this._writableState.errorEmitted)) {
+      pna.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) {
+      pna.nextTick(emitErrorNT, _this, err);
+      if (_this._writableState) {
+        _this._writableState.errorEmitted = true;
+      }
+    } else if (cb) {
+      cb(err);
+    }
+  });
+
+  return this;
+}
+
+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.finished = false;
+    this._writableState.errorEmitted = false;
+  }
+}
+
+function emitErrorNT(self, err) {
+  self.emit('error', err);
+}
+
+module.exports = {
+  destroy: destroy,
+  undestroy: undestroy
+};
+},{"process-nextick-args":95}],109:[function(require,module,exports){
+module.exports = require('events').EventEmitter;
+
+},{"events":79}],110:[function(require,module,exports){
+/* 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)
+}
+
+// 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":12}],111:[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":110}],112:[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');
+
+},{"./lib/_stream_duplex.js":102,"./lib/_stream_passthrough.js":103,"./lib/_stream_readable.js":104,"./lib/_stream_transform.js":105,"./lib/_stream_writable.js":106}],113:[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;
+
+},{}],114:[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":12}],115:[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
+}
+
+},{}],116:[function(require,module,exports){
+(function (setImmediate,clearImmediate){(function (){
+var nextTick = require('process/browser.js').nextTick;
+var apply = Function.prototype.apply;
+var slice = Array.prototype.slice;
+var immediateIds = {};
+var nextImmediateId = 0;
+
+// DOM APIs, for completeness
+
+exports.setTimeout = function() {
+  return new Timeout(apply.call(setTimeout, window, arguments), clearTimeout);
+};
+exports.setInterval = function() {
+  return new Timeout(apply.call(setInterval, window, arguments), clearInterval);
+};
+exports.clearTimeout =
+exports.clearInterval = function(timeout) { timeout.close(); };
+
+function Timeout(id, clearFn) {
+  this._id = id;
+  this._clearFn = clearFn;
+}
+Timeout.prototype.unref = Timeout.prototype.ref = function() {};
+Timeout.prototype.close = function() {
+  this._clearFn.call(window, this._id);
+};
+
+// Does not start the time, just sets up the members needed.
+exports.enroll = function(item, msecs) {
+  clearTimeout(item._idleTimeoutId);
+  item._idleTimeout = msecs;
+};
+
+exports.unenroll = function(item) {
+  clearTimeout(item._idleTimeoutId);
+  item._idleTimeout = -1;
+};
+
+exports._unrefActive = exports.active = function(item) {
+  clearTimeout(item._idleTimeoutId);
+
+  var msecs = item._idleTimeout;
+  if (msecs >= 0) {
+    item._idleTimeoutId = setTimeout(function onTimeout() {
+      if (item._onTimeout)
+        item._onTimeout();
+    }, msecs);
+  }
+};
+
+// That's not how node.js implements it but the exposed api is the same.
+exports.setImmediate = typeof setImmediate === "function" ? setImmediate : function(fn) {
+  var id = nextImmediateId++;
+  var args = arguments.length < 2 ? false : slice.call(arguments, 1);
+
+  immediateIds[id] = true;
+
+  nextTick(function onNextTick() {
+    if (immediateIds[id]) {
+      // fn.call() is faster so we optimize for the common use-case
+      // @see http://jsperf.com/call-apply-segu
+      if (args) {
+        fn.apply(null, args);
+      } else {
+        fn.call(null);
+      }
+      // Prevent ids from leaking
+      exports.clearImmediate(id);
+    }
+  });
+
+  return id;
+};
+
+exports.clearImmediate = typeof clearImmediate === "function" ? clearImmediate : function(id) {
+  delete immediateIds[id];
+};
+}).call(this)}).call(this,require("timers").setImmediate,require("timers").clearImmediate)
+},{"process/browser.js":96,"timers":116}],117:[function(require,module,exports){
+"use strict";
+
+var isPrototype = require("../prototype/is");
+
+module.exports = function (value) {
+	if (typeof value !== "function") return false;
+
+	if (!hasOwnProperty.call(value, "length")) return false;
+
+	try {
+		if (typeof value.length !== "number") return false;
+		if (typeof value.call !== "function") return false;
+		if (typeof value.apply !== "function") return false;
+	} catch (error) {
+		return false;
+	}
+
+	return !isPrototype(value);
+};
+
+},{"../prototype/is":124}],118:[function(require,module,exports){
+"use strict";
+
+var isValue       = require("../value/is")
+  , isObject      = require("../object/is")
+  , stringCoerce  = require("../string/coerce")
+  , toShortString = require("./to-short-string");
+
+var resolveMessage = function (message, value) {
+	return message.replace("%v", toShortString(value));
+};
+
+module.exports = function (value, defaultMessage, inputOptions) {
+	if (!isObject(inputOptions)) throw new TypeError(resolveMessage(defaultMessage, value));
+	if (!isValue(value)) {
+		if ("default" in inputOptions) return inputOptions["default"];
+		if (inputOptions.isOptional) return null;
+	}
+	var errorMessage = stringCoerce(inputOptions.errorMessage);
+	if (!isValue(errorMessage)) errorMessage = defaultMessage;
+	throw new TypeError(resolveMessage(errorMessage, value));
+};
+
+},{"../object/is":121,"../string/coerce":125,"../value/is":127,"./to-short-string":120}],119:[function(require,module,exports){
+"use strict";
+
+module.exports = function (value) {
+	try {
+		return value.toString();
+	} catch (error) {
+		try { return String(value); }
+		catch (error2) { return null; }
+	}
+};
+
+},{}],120:[function(require,module,exports){
+"use strict";
+
+var safeToString = require("./safe-to-string");
+
+var reNewLine = /[\n\r\u2028\u2029]/g;
+
+module.exports = function (value) {
+	var string = safeToString(value);
+	if (string === null) return "<Non-coercible to string value>";
+	// Trim if too long
+	if (string.length > 100) string = string.slice(0, 99) + "…";
+	// Replace eventual new lines
+	string = string.replace(reNewLine, function (char) {
+		switch (char) {
+			case "\n":
+				return "\\n";
+			case "\r":
+				return "\\r";
+			case "\u2028":
+				return "\\u2028";
+			case "\u2029":
+				return "\\u2029";
+			/* istanbul ignore next */
+			default:
+				throw new Error("Unexpected character");
+		}
+	});
+	return string;
+};
+
+},{"./safe-to-string":119}],121:[function(require,module,exports){
+"use strict";
+
+var isValue = require("../value/is");
+
+// prettier-ignore
+var possibleTypes = { "object": true, "function": true, "undefined": true /* document.all */ };
+
+module.exports = function (value) {
+	if (!isValue(value)) return false;
+	return hasOwnProperty.call(possibleTypes, typeof value);
+};
+
+},{"../value/is":127}],122:[function(require,module,exports){
+"use strict";
+
+var resolveException = require("../lib/resolve-exception")
+  , is               = require("./is");
+
+module.exports = function (value/*, options*/) {
+	if (is(value)) return value;
+	return resolveException(value, "%v is not a plain function", arguments[1]);
+};
+
+},{"../lib/resolve-exception":118,"./is":123}],123:[function(require,module,exports){
+"use strict";
+
+var isFunction = require("../function/is");
+
+var classRe = /^\s*class[\s{/}]/, functionToString = Function.prototype.toString;
+
+module.exports = function (value) {
+	if (!isFunction(value)) return false;
+	if (classRe.test(functionToString.call(value))) return false;
+	return true;
+};
+
+},{"../function/is":117}],124:[function(require,module,exports){
+"use strict";
+
+var isObject = require("../object/is");
+
+module.exports = function (value) {
+	if (!isObject(value)) return false;
+	try {
+		if (!value.constructor) return false;
+		return value.constructor.prototype === value;
+	} catch (error) {
+		return false;
+	}
+};
+
+},{"../object/is":121}],125:[function(require,module,exports){
+"use strict";
+
+var isValue  = require("../value/is")
+  , isObject = require("../object/is");
+
+var objectToString = Object.prototype.toString;
+
+module.exports = function (value) {
+	if (!isValue(value)) return null;
+	if (isObject(value)) {
+		// Reject Object.prototype.toString coercion
+		var valueToString = value.toString;
+		if (typeof valueToString !== "function") return null;
+		if (valueToString === objectToString) return null;
+		// Note: It can be object coming from other realm, still as there's no ES3 and CSP compliant
+		// way to resolve its realm's Object.prototype.toString it's left as not addressed edge case
+	}
+	try {
+		return "" + value; // Ensure implicit coercion
+	} catch (error) {
+		return null;
+	}
+};
+
+},{"../object/is":121,"../value/is":127}],126:[function(require,module,exports){
+"use strict";
+
+var resolveException = require("../lib/resolve-exception")
+  , is               = require("./is");
+
+module.exports = function (value/*, options*/) {
+	if (is(value)) return value;
+	return resolveException(value, "Cannot use %v", arguments[1]);
+};
+
+},{"../lib/resolve-exception":118,"./is":127}],127:[function(require,module,exports){
+"use strict";
+
+// ES3 safe
+var _undefined = void 0;
+
+module.exports = function (value) { return value !== _undefined && value !== null; };
+
+},{}],128:[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":129,"punycode":97,"querystring":100}],129:[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;
+  }
+};
+
+},{}],130:[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 : {})
+},{}],131:[function(require,module,exports){
+if (typeof Object.create === 'function') {
+  // implementation from standard node.js 'util' module
+  module.exports = function inherits(ctor, 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) {
+    ctor.super_ = superCtor
+    var TempCtor = function () {}
+    TempCtor.prototype = superCtor.prototype
+    ctor.prototype = new TempCtor()
+    ctor.prototype.constructor = ctor
+  }
+}
+
+},{}],132:[function(require,module,exports){
+module.exports = function isBuffer(arg) {
+  return arg && typeof arg === 'object'
+    && typeof arg.copy === 'function'
+    && typeof arg.fill === 'function'
+    && typeof arg.readUInt8 === 'function';
+}
+},{}],133:[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.
+
+var formatRegExp = /%[sdj%]/g;
+exports.format = function(f) {
+  if (!isString(f)) {
+    var objects = [];
+    for (var i = 0; i < arguments.length; i++) {
+      objects.push(inspect(arguments[i]));
+    }
+    return objects.join(' ');
+  }
+
+  var i = 1;
+  var args = arguments;
+  var len = args.length;
+  var str = String(f).replace(formatRegExp, function(x) {
+    if (x === '%%') return '%';
+    if (i >= len) return x;
+    switch (x) {
+      case '%s': return String(args[i++]);
+      case '%d': return Number(args[i++]);
+      case '%j':
+        try {
+          return JSON.stringify(args[i++]);
+        } catch (_) {
+          return '[Circular]';
+        }
+      default:
+        return x;
+    }
+  });
+  for (var x = args[i]; i < len; x = args[++i]) {
+    if (isNull(x) || !isObject(x)) {
+      str += ' ' + x;
+    } else {
+      str += ' ' + inspect(x);
+    }
+  }
+  return str;
+};
+
+
+// Mark that a method should not be used.
+// Returns a modified function which warns once by default.
+// If --no-deprecation is set, then it is a no-op.
+exports.deprecate = function(fn, msg) {
+  // Allow for deprecating things in the process of starting up.
+  if (isUndefined(global.process)) {
+    return function() {
+      return exports.deprecate(fn, msg).apply(this, arguments);
+    };
+  }
+
+  if (process.noDeprecation === true) {
+    return fn;
+  }
+
+  var warned = false;
+  function deprecated() {
+    if (!warned) {
+      if (process.throwDeprecation) {
+        throw new Error(msg);
+      } else if (process.traceDeprecation) {
+        console.trace(msg);
+      } else {
+        console.error(msg);
+      }
+      warned = true;
+    }
+    return fn.apply(this, arguments);
+  }
+
+  return deprecated;
+};
+
+
+var debugs = {};
+var debugEnviron;
+exports.debuglog = function(set) {
+  if (isUndefined(debugEnviron))
+    debugEnviron = process.env.NODE_DEBUG || '';
+  set = set.toUpperCase();
+  if (!debugs[set]) {
+    if (new RegExp('\\b' + set + '\\b', 'i').test(debugEnviron)) {
+      var pid = process.pid;
+      debugs[set] = function() {
+        var msg = exports.format.apply(exports, arguments);
+        console.error('%s %d: %s', set, pid, msg);
+      };
+    } else {
+      debugs[set] = function() {};
+    }
+  }
+  return debugs[set];
+};
+
+
+/**
+ * Echos the value of a value. Trys to print the value out
+ * in the best way possible given the different types.
+ *
+ * @param {Object} obj The object to print out.
+ * @param {Object} opts Optional options object that alters the output.
+ */
+/* legacy: obj, showHidden, depth, colors*/
+function inspect(obj, opts) {
+  // default options
+  var ctx = {
+    seen: [],
+    stylize: stylizeNoColor
+  };
+  // legacy...
+  if (arguments.length >= 3) ctx.depth = arguments[2];
+  if (arguments.length >= 4) ctx.colors = arguments[3];
+  if (isBoolean(opts)) {
+    // legacy...
+    ctx.showHidden = opts;
+  } else if (opts) {
+    // got an "options" object
+    exports._extend(ctx, opts);
+  }
+  // set default options
+  if (isUndefined(ctx.showHidden)) ctx.showHidden = false;
+  if (isUndefined(ctx.depth)) ctx.depth = 2;
+  if (isUndefined(ctx.colors)) ctx.colors = false;
+  if (isUndefined(ctx.customInspect)) ctx.customInspect = true;
+  if (ctx.colors) ctx.stylize = stylizeWithColor;
+  return formatValue(ctx, obj, ctx.depth);
+}
+exports.inspect = inspect;
+
+
+// http://en.wikipedia.org/wiki/ANSI_escape_code#graphics
+inspect.colors = {
+  'bold' : [1, 22],
+  'italic' : [3, 23],
+  'underline' : [4, 24],
+  'inverse' : [7, 27],
+  'white' : [37, 39],
+  'grey' : [90, 39],
+  'black' : [30, 39],
+  'blue' : [34, 39],
+  'cyan' : [36, 39],
+  'green' : [32, 39],
+  'magenta' : [35, 39],
+  'red' : [31, 39],
+  'yellow' : [33, 39]
+};
+
+// Don't use 'blue' not visible on cmd.exe
+inspect.styles = {
+  'special': 'cyan',
+  'number': 'yellow',
+  'boolean': 'yellow',
+  'undefined': 'grey',
+  'null': 'bold',
+  'string': 'green',
+  'date': 'magenta',
+  // "name": intentionally not styling
+  'regexp': 'red'
+};
+
+
+function stylizeWithColor(str, styleType) {
+  var style = inspect.styles[styleType];
+
+  if (style) {
+    return '\u001b[' + inspect.colors[style][0] + 'm' + str +
+           '\u001b[' + inspect.colors[style][1] + 'm';
+  } else {
+    return str;
+  }
+}
+
+
+function stylizeNoColor(str, styleType) {
+  return str;
+}
+
+
+function arrayToHash(array) {
+  var hash = {};
+
+  array.forEach(function(val, idx) {
+    hash[val] = true;
+  });
+
+  return hash;
+}
+
+
+function formatValue(ctx, value, recurseTimes) {
+  // Provide a hook for user-specified inspect functions.
+  // Check that value is an object with an inspect function on it
+  if (ctx.customInspect &&
+      value &&
+      isFunction(value.inspect) &&
+      // Filter out the util module, it's inspect function is special
+      value.inspect !== exports.inspect &&
+      // Also filter out any prototype objects using the circular check.
+      !(value.constructor && value.constructor.prototype === value)) {
+    var ret = value.inspect(recurseTimes, ctx);
+    if (!isString(ret)) {
+      ret = formatValue(ctx, ret, recurseTimes);
+    }
+    return ret;
+  }
+
+  // Primitive types cannot have properties
+  var primitive = formatPrimitive(ctx, value);
+  if (primitive) {
+    return primitive;
+  }
+
+  // Look up the keys of the object.
+  var keys = Object.keys(value);
+  var visibleKeys = arrayToHash(keys);
+
+  if (ctx.showHidden) {
+    keys = Object.getOwnPropertyNames(value);
+  }
+
+  // IE doesn't make error fields non-enumerable
+  // http://msdn.microsoft.com/en-us/library/ie/dww52sbt(v=vs.94).aspx
+  if (isError(value)
+      && (keys.indexOf('message') >= 0 || keys.indexOf('description') >= 0)) {
+    return formatError(value);
+  }
+
+  // Some type of object without properties can be shortcutted.
+  if (keys.length === 0) {
+    if (isFunction(value)) {
+      var name = value.name ? ': ' + value.name : '';
+      return ctx.stylize('[Function' + name + ']', 'special');
+    }
+    if (isRegExp(value)) {
+      return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
+    }
+    if (isDate(value)) {
+      return ctx.stylize(Date.prototype.toString.call(value), 'date');
+    }
+    if (isError(value)) {
+      return formatError(value);
+    }
+  }
+
+  var base = '', array = false, braces = ['{', '}'];
+
+  // Make Array say that they are Array
+  if (isArray(value)) {
+    array = true;
+    braces = ['[', ']'];
+  }
+
+  // Make functions say that they are functions
+  if (isFunction(value)) {
+    var n = value.name ? ': ' + value.name : '';
+    base = ' [Function' + n + ']';
+  }
+
+  // Make RegExps say that they are RegExps
+  if (isRegExp(value)) {
+    base = ' ' + RegExp.prototype.toString.call(value);
+  }
+
+  // Make dates with properties first say the date
+  if (isDate(value)) {
+    base = ' ' + Date.prototype.toUTCString.call(value);
+  }
+
+  // Make error with message first say the error
+  if (isError(value)) {
+    base = ' ' + formatError(value);
+  }
+
+  if (keys.length === 0 && (!array || value.length == 0)) {
+    return braces[0] + base + braces[1];
+  }
+
+  if (recurseTimes < 0) {
+    if (isRegExp(value)) {
+      return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
+    } else {
+      return ctx.stylize('[Object]', 'special');
+    }
+  }
+
+  ctx.seen.push(value);
+
+  var output;
+  if (array) {
+    output = formatArray(ctx, value, recurseTimes, visibleKeys, keys);
+  } else {
+    output = keys.map(function(key) {
+      return formatProperty(ctx, value, recurseTimes, visibleKeys, key, array);
+    });
+  }
+
+  ctx.seen.pop();
+
+  return reduceToSingleString(output, base, braces);
+}
+
+
+function formatPrimitive(ctx, value) {
+  if (isUndefined(value))
+    return ctx.stylize('undefined', 'undefined');
+  if (isString(value)) {
+    var simple = '\'' + JSON.stringify(value).replace(/^"|"$/g, '')
+                                             .replace(/'/g, "\\'")
+                                             .replace(/\\"/g, '"') + '\'';
+    return ctx.stylize(simple, 'string');
+  }
+  if (isNumber(value))
+    return ctx.stylize('' + value, 'number');
+  if (isBoolean(value))
+    return ctx.stylize('' + value, 'boolean');
+  // For some reason typeof null is "object", so special case here.
+  if (isNull(value))
+    return ctx.stylize('null', 'null');
+}
+
+
+function formatError(value) {
+  return '[' + Error.prototype.toString.call(value) + ']';
+}
+
+
+function formatArray(ctx, value, recurseTimes, visibleKeys, keys) {
+  var output = [];
+  for (var i = 0, l = value.length; i < l; ++i) {
+    if (hasOwnProperty(value, String(i))) {
+      output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
+          String(i), true));
+    } else {
+      output.push('');
+    }
+  }
+  keys.forEach(function(key) {
+    if (!key.match(/^\d+$/)) {
+      output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
+          key, true));
+    }
+  });
+  return output;
+}
+
+
+function formatProperty(ctx, value, recurseTimes, visibleKeys, key, array) {
+  var name, str, desc;
+  desc = Object.getOwnPropertyDescriptor(value, key) || { value: value[key] };
+  if (desc.get) {
+    if (desc.set) {
+      str = ctx.stylize('[Getter/Setter]', 'special');
+    } else {
+      str = ctx.stylize('[Getter]', 'special');
+    }
+  } else {
+    if (desc.set) {
+      str = ctx.stylize('[Setter]', 'special');
+    }
+  }
+  if (!hasOwnProperty(visibleKeys, key)) {
+    name = '[' + key + ']';
+  }
+  if (!str) {
+    if (ctx.seen.indexOf(desc.value) < 0) {
+      if (isNull(recurseTimes)) {
+        str = formatValue(ctx, desc.value, null);
+      } else {
+        str = formatValue(ctx, desc.value, recurseTimes - 1);
+      }
+      if (str.indexOf('\n') > -1) {
+        if (array) {
+          str = str.split('\n').map(function(line) {
+            return '  ' + line;
+          }).join('\n').substr(2);
+        } else {
+          str = '\n' + str.split('\n').map(function(line) {
+            return '   ' + line;
+          }).join('\n');
+        }
+      }
+    } else {
+      str = ctx.stylize('[Circular]', 'special');
+    }
+  }
+  if (isUndefined(name)) {
+    if (array && key.match(/^\d+$/)) {
+      return str;
+    }
+    name = JSON.stringify('' + key);
+    if (name.match(/^"([a-zA-Z_][a-zA-Z_0-9]*)"$/)) {
+      name = name.substr(1, name.length - 2);
+      name = ctx.stylize(name, 'name');
+    } else {
+      name = name.replace(/'/g, "\\'")
+                 .replace(/\\"/g, '"')
+                 .replace(/(^"|"$)/g, "'");
+      name = ctx.stylize(name, 'string');
+    }
+  }
+
+  return name + ': ' + str;
+}
+
+
+function reduceToSingleString(output, base, braces) {
+  var numLinesEst = 0;
+  var length = output.reduce(function(prev, cur) {
+    numLinesEst++;
+    if (cur.indexOf('\n') >= 0) numLinesEst++;
+    return prev + cur.replace(/\u001b\[\d\d?m/g, '').length + 1;
+  }, 0);
+
+  if (length > 60) {
+    return braces[0] +
+           (base === '' ? '' : base + '\n ') +
+           ' ' +
+           output.join(',\n  ') +
+           ' ' +
+           braces[1];
+  }
+
+  return braces[0] + base + ' ' + output.join(', ') + ' ' + braces[1];
+}
+
+
+// NOTE: These type checking functions intentionally don't use `instanceof`
+// because it is fragile and can be easily faked with `Object.create()`.
+function isArray(ar) {
+  return Array.isArray(ar);
+}
+exports.isArray = isArray;
+
+function isBoolean(arg) {
+  return typeof arg === 'boolean';
+}
+exports.isBoolean = isBoolean;
+
+function isNull(arg) {
+  return arg === null;
+}
+exports.isNull = isNull;
+
+function isNullOrUndefined(arg) {
+  return arg == null;
+}
+exports.isNullOrUndefined = isNullOrUndefined;
+
+function isNumber(arg) {
+  return typeof arg === 'number';
+}
+exports.isNumber = isNumber;
+
+function isString(arg) {
+  return typeof arg === 'string';
+}
+exports.isString = isString;
+
+function isSymbol(arg) {
+  return typeof arg === 'symbol';
+}
+exports.isSymbol = isSymbol;
+
+function isUndefined(arg) {
+  return arg === void 0;
+}
+exports.isUndefined = isUndefined;
+
+function isRegExp(re) {
+  return isObject(re) && objectToString(re) === '[object RegExp]';
+}
+exports.isRegExp = isRegExp;
+
+function isObject(arg) {
+  return typeof arg === 'object' && arg !== null;
+}
+exports.isObject = isObject;
+
+function isDate(d) {
+  return isObject(d) && objectToString(d) === '[object Date]';
+}
+exports.isDate = isDate;
+
+function isError(e) {
+  return isObject(e) &&
+      (objectToString(e) === '[object Error]' || e instanceof Error);
+}
+exports.isError = isError;
+
+function isFunction(arg) {
+  return typeof arg === 'function';
+}
+exports.isFunction = isFunction;
+
+function isPrimitive(arg) {
+  return arg === null ||
+         typeof arg === 'boolean' ||
+         typeof arg === 'number' ||
+         typeof arg === 'string' ||
+         typeof arg === 'symbol' ||  // ES6 symbol
+         typeof arg === 'undefined';
+}
+exports.isPrimitive = isPrimitive;
+
+exports.isBuffer = require('./support/isBuffer');
+
+function objectToString(o) {
+  return Object.prototype.toString.call(o);
+}
+
+
+function pad(n) {
+  return n < 10 ? '0' + n.toString(10) : n.toString(10);
+}
+
+
+var months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep',
+              'Oct', 'Nov', 'Dec'];
+
+// 26 Feb 16:19:34
+function timestamp() {
+  var d = new Date();
+  var time = [pad(d.getHours()),
+              pad(d.getMinutes()),
+              pad(d.getSeconds())].join(':');
+  return [d.getDate(), months[d.getMonth()], time].join(' ');
+}
+
+
+// log is just a thin wrapper to console.log that prepends a timestamp
+exports.log = function() {
+  console.log('%s - %s', timestamp(), exports.format.apply(exports, arguments));
+};
+
+
+/**
+ * Inherit the prototype methods from one constructor into another.
+ *
+ * The Function.prototype.inherits from lang.js rewritten as a standalone
+ * function (not on Function.prototype). NOTE: If this file is to be loaded
+ * during bootstrapping this function needs to be rewritten using some native
+ * functions as prototype setup using normal JavaScript does not work as
+ * expected during bootstrapping (see mirror.js in r114903).
+ *
+ * @param {function} ctor Constructor function which needs to inherit the
+ *     prototype.
+ * @param {function} superCtor Constructor function to inherit prototype from.
+ */
+exports.inherits = require('inherits');
+
+exports._extend = function(origin, add) {
+  // Don't do anything if add isn't an object
+  if (!add || !isObject(add)) return origin;
+
+  var keys = Object.keys(add);
+  var i = keys.length;
+  while (i--) {
+    origin[keys[i]] = add[keys[i]];
+  }
+  return origin;
+};
+
+function hasOwnProperty(obj, prop) {
+  return Object.prototype.hasOwnProperty.call(obj, prop);
+}
+
+}).call(this)}).call(this,require('_process'),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
+},{"./support/isBuffer":132,"_process":96,"inherits":131}],134:[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 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) {
+  if (this.destroyed) return
+  this.destroyed = true
+
+  var self = this
+  process.nextTick(function() {
+    self._destroy(err)
+  })
+}
+
+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 cb()
+  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 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.write(SIGNAL_FLUSH)
+  return stream.Writable.prototype.end.call(this, cb)
+}
+
+module.exports = Duplexify
+
+}).call(this)}).call(this,require('_process'),require("buffer").Buffer)
+},{"_process":96,"buffer":12,"end-of-stream":16,"inherits":84,"readable-stream":143,"stream-shift":115}],135:[function(require,module,exports){
+arguments[4][102][0].apply(exports,arguments)
+},{"./_stream_readable":137,"./_stream_writable":139,"core-util-is":13,"dup":102,"inherits":84,"process-nextick-args":95}],136:[function(require,module,exports){
+arguments[4][103][0].apply(exports,arguments)
+},{"./_stream_transform":138,"core-util-is":13,"dup":103,"inherits":84}],137:[function(require,module,exports){
+arguments[4][104][0].apply(exports,arguments)
+},{"./_stream_duplex":135,"./internal/streams/BufferList":140,"./internal/streams/destroy":141,"./internal/streams/stream":142,"_process":96,"core-util-is":13,"dup":104,"events":79,"inherits":84,"isarray":86,"process-nextick-args":95,"safe-buffer":144,"string_decoder/":160,"util":11}],138:[function(require,module,exports){
+arguments[4][105][0].apply(exports,arguments)
+},{"./_stream_duplex":135,"core-util-is":13,"dup":105,"inherits":84}],139:[function(require,module,exports){
+arguments[4][106][0].apply(exports,arguments)
+},{"./_stream_duplex":135,"./internal/streams/destroy":141,"./internal/streams/stream":142,"_process":96,"core-util-is":13,"dup":106,"inherits":84,"process-nextick-args":95,"safe-buffer":144,"timers":116,"util-deprecate":130}],140:[function(require,module,exports){
+arguments[4][107][0].apply(exports,arguments)
+},{"dup":107,"safe-buffer":144,"util":11}],141:[function(require,module,exports){
+arguments[4][108][0].apply(exports,arguments)
+},{"dup":108,"process-nextick-args":95}],142:[function(require,module,exports){
+arguments[4][109][0].apply(exports,arguments)
+},{"dup":109,"events":79}],143:[function(require,module,exports){
+arguments[4][112][0].apply(exports,arguments)
+},{"./lib/_stream_duplex.js":135,"./lib/_stream_passthrough.js":136,"./lib/_stream_readable.js":137,"./lib/_stream_transform.js":138,"./lib/_stream_writable.js":139,"dup":112}],144:[function(require,module,exports){
+arguments[4][110][0].apply(exports,arguments)
+},{"buffer":12,"dup":110}],145:[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;
+
+},{}],146:[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":148,"./_stream_writable":150,"_process":96,"inherits":84}],147:[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":149,"inherits":84}],148:[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":145,"./_stream_duplex":146,"./internal/streams/async_iterator":151,"./internal/streams/buffer_list":152,"./internal/streams/destroy":153,"./internal/streams/from":155,"./internal/streams/state":157,"./internal/streams/stream":158,"_process":96,"buffer":12,"events":79,"inherits":84,"string_decoder/":160,"util":11}],149:[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":145,"./_stream_duplex":146,"inherits":84}],150:[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":145,"./_stream_duplex":146,"./internal/streams/destroy":153,"./internal/streams/state":157,"./internal/streams/stream":158,"_process":96,"buffer":12,"inherits":84,"util-deprecate":130}],151:[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":154,"_process":96}],152:[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":12,"util":11}],153:[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":96}],154:[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":145}],155:[function(require,module,exports){
+module.exports = function () {
+  throw new Error('Readable.from is not available in the browser')
+};
+
+},{}],156:[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":145,"./end-of-stream":154}],157:[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":145}],158:[function(require,module,exports){
+arguments[4][109][0].apply(exports,arguments)
+},{"dup":109,"events":79}],159:[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":146,"./lib/_stream_passthrough.js":147,"./lib/_stream_readable.js":148,"./lib/_stream_transform.js":149,"./lib/_stream_writable.js":150,"./lib/internal/streams/end-of-stream.js":154,"./lib/internal/streams/pipeline.js":156}],160:[function(require,module,exports){
+arguments[4][111][0].apply(exports,arguments)
+},{"dup":111,"safe-buffer":161}],161:[function(require,module,exports){
+arguments[4][110][0].apply(exports,arguments)
+},{"buffer":12,"dup":110}],162:[function(require,module,exports){
+(function (process,global){(function (){
+'use strict'
+
+var Transform = require('readable-stream').Transform
+var duplexify = require('duplexify')
+var WS = require('ws')
+var Buffer = require('safe-buffer').Buffer
+
+module.exports = WebSocketStream
+
+function buildProxy (options, socketWrite, socketEnd) {
+  var proxy = new Transform({
+    objectMode: options.objectMode
+  })
+
+  proxy._write = socketWrite
+  proxy._flush = socketEnd
+
+  return proxy
+}
+
+function WebSocketStream(target, protocols, options) {
+  var stream, socket
+
+  var isBrowser = process.title === 'browser'
+  var isNative = !!global.WebSocket
+  var socketWrite = isBrowser ? socketWriteBrowser : socketWriteNode
+
+  if (protocols && !Array.isArray(protocols) && 'object' === typeof protocols) {
+    // accept the "options" Object as the 2nd argument
+    options = protocols
+    protocols = null
+
+    if (typeof options.protocol === 'string' || Array.isArray(options.protocol)) {
+      protocols = options.protocol;
+    }
+  }
+
+  if (!options) options = {}
+
+  if (options.objectMode === undefined) {
+    options.objectMode = !(options.binary === true || options.binary === undefined)
+  }
+
+  var proxy = buildProxy(options, socketWrite, socketEnd)
+
+  if (!options.objectMode) {
+    proxy._writev = writev
+  }
+
+  // browser only: sets the maximum socket buffer size before throttling
+  var bufferSize = options.browserBufferSize || 1024 * 512
+
+  // browser only: how long to wait when throttling
+  var bufferTimeout = options.browserBufferTimeout || 1000
+
+  // use existing WebSocket object that was passed in
+  if (typeof target === 'object') {
+    socket = target
+  // otherwise make a new one
+  } else {
+    // special constructor treatment for native websockets in browsers, see
+    // https://github.com/maxogden/websocket-stream/issues/82
+    if (isNative && isBrowser) {
+      socket = new WS(target, protocols)
+    } else {
+      socket = new WS(target, protocols, options)
+    }
+
+    socket.binaryType = 'arraybuffer'
+  }
+
+  // was already open when passed in
+  if (socket.readyState === socket.OPEN) {
+    stream = proxy
+  } else if (isBrowser) {
+    stream = proxy
+    stream.cork()
+    socket.onopen = onopenBrowser
+  } else {
+    stream = duplexify.obj()
+    socket.onopen = onopen
+  }
+
+  stream.socket = socket
+
+  socket.onclose = onclose
+  socket.onerror = onerror
+  socket.onmessage = onmessage
+
+  proxy.on('close', destroy)
+
+  var coerceToBuffer = !options.objectMode
+
+  function socketWriteNode(chunk, enc, next) {
+    // avoid errors, this never happens unless
+    // destroy() is called
+    if (socket.readyState !== socket.OPEN) {
+      next()
+      return
+    }
+
+    if (coerceToBuffer && typeof chunk === 'string') {
+      chunk = Buffer.from(chunk, 'utf8')
+    }
+    socket.send(chunk, next)
+  }
+
+  function socketWriteBrowser(chunk, enc, next) {
+    if (socket.bufferedAmount > bufferSize) {
+      setTimeout(socketWriteBrowser, bufferTimeout, chunk, enc, next)
+      return
+    }
+
+    if (coerceToBuffer && typeof chunk === 'string') {
+      chunk = Buffer.from(chunk, 'utf8')
+    }
+
+    try {
+      socket.send(chunk)
+    } catch(err) {
+      return next(err)
+    }
+
+    next()
+  }
+
+  function socketEnd(done) {
+    socket.close()
+    done()
+  }
+
+  function onopen() {
+    stream.setReadable(proxy)
+    stream.setWritable(proxy)
+    stream.emit('connect')
+  }
+
+  function onopenBrowser () {
+    stream.uncork()
+    stream.emit('connect')
+  }
+
+  function onclose() {
+    stream.end()
+    stream.destroy()
+  }
+
+  function onerror(err) {
+    stream.destroy(err)
+  }
+
+  function onmessage(event) {
+    var data = event.data
+    if (data instanceof ArrayBuffer) data = Buffer.from(data)
+    else data = Buffer.from(data, 'utf8')
+    proxy.push(data)
+  }
+
+  function destroy() {
+    socket.close()
+  }
+
+  // this is to be enabled only if objectMode is false
+  function writev (chunks, cb) {
+    var buffers = new Array(chunks.length)
+    for (var 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)
+  }
+
+  return stream
+}
+
+}).call(this)}).call(this,require('_process'),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
+},{"_process":96,"duplexify":134,"readable-stream":159,"safe-buffer":114,"ws":163}],163:[function(require,module,exports){
+
+var ws = null
+
+if (typeof WebSocket !== 'undefined') {
+  ws = WebSocket
+} else if (typeof MozWebSocket !== 'undefined') {
+  ws = MozWebSocket
+} else if (typeof window !== 'undefined') {
+  ws = window.WebSocket || window.MozWebSocket
+}
+
+module.exports = ws
+
+},{}],164:[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
+  }
+}
+
+},{}],165:[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
+}
+
+},{}]},{},[8])(8)
+});