teambition-sdk-socket/socket.bundle.js

Front-End SDK for Teambition

(function (global, factory) {
	typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
	typeof define === 'function' && define.amd ? define(factory) :
	(global.sdkSocket = factory());
}(this, (function () { 'use strict';

var commonjsGlobal = typeof window !== 'undefined' ? window : typeof global !== 'undefined' ? global : typeof self !== 'undefined' ? self : {};



function unwrapExports (x) {
	return x && x.__esModule ? x['default'] : x;
}

function createCommonjsModule(fn, module) {
	return module = { exports: {} }, fn(module, module.exports), module.exports;
}

var engine_io = createCommonjsModule(function (module, exports) {
(function webpackUniversalModuleDefinition(root, factory) {
	module.exports = factory();
})(commonjsGlobal, function() {
return /******/ (function(modules) { // webpackBootstrap
/******/ 	// The module cache
/******/ 	var installedModules = {};

/******/ 	// The require function
/******/ 	function __webpack_require__(moduleId) {

/******/ 		// Check if module is in cache
/******/ 		if(installedModules[moduleId])
/******/ 			return installedModules[moduleId].exports;

/******/ 		// Create a new module (and put it into the cache)
/******/ 		var module = installedModules[moduleId] = {
/******/ 			exports: {},
/******/ 			id: moduleId,
/******/ 			loaded: false
/******/ 		};

/******/ 		// Execute the module function
/******/ 		modules[moduleId].call(module.exports, module, module.exports, __webpack_require__);

/******/ 		// Flag the module as loaded
/******/ 		module.loaded = true;

/******/ 		// Return the exports of the module
/******/ 		return module.exports;
/******/ 	}


/******/ 	// expose the modules object (__webpack_modules__)
/******/ 	__webpack_require__.m = modules;

/******/ 	// expose the module cache
/******/ 	__webpack_require__.c = installedModules;

/******/ 	// __webpack_public_path__
/******/ 	__webpack_require__.p = "";

/******/ 	// Load entry module and return exports
/******/ 	return __webpack_require__(0);
/******/ })
/************************************************************************/
/******/ ([
/* 0 */
/***/ function(module, exports, __webpack_require__) {

	'use strict';

	module.exports = __webpack_require__(1);

/***/ },
/* 1 */
/***/ function(module, exports, __webpack_require__) {

	'use strict';

	module.exports = __webpack_require__(2);

	/**
	 * Exports parser
	 *
	 * @api public
	 *
	 */
	module.exports.parser = __webpack_require__(9);

/***/ },
/* 2 */
/***/ function(module, exports, __webpack_require__) {

	/* WEBPACK VAR INJECTION */(function(global) {'use strict';

	var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; };

	/**
	 * Module dependencies.
	 */

	var transports = __webpack_require__(3);
	var Emitter = __webpack_require__(19);
	var debug = __webpack_require__(23)('engine.io-client:socket');
	var index = __webpack_require__(30);
	var parser = __webpack_require__(9);
	var parseuri = __webpack_require__(31);
	var parsejson = __webpack_require__(32);
	var parseqs = __webpack_require__(20);

	/**
	 * Module exports.
	 */

	module.exports = Socket;

	/**
	 * Socket constructor.
	 *
	 * @param {String|Object} uri or options
	 * @param {Object} options
	 * @api public
	 */

	function Socket(uri, opts) {
	  if (!(this instanceof Socket)) return new Socket(uri, opts);

	  opts = opts || {};

	  if (uri && 'object' === (typeof uri === 'undefined' ? 'undefined' : _typeof(uri))) {
	    opts = uri;
	    uri = null;
	  }

	  if (uri) {
	    uri = parseuri(uri);
	    opts.hostname = uri.host;
	    opts.secure = uri.protocol === 'https' || uri.protocol === 'wss';
	    opts.port = uri.port;
	    if (uri.query) opts.query = uri.query;
	  } else if (opts.host) {
	    opts.hostname = parseuri(opts.host).host;
	  }

	  this.secure = null != opts.secure ? opts.secure : global.location && 'https:' === location.protocol;

	  if (opts.hostname && !opts.port) {
	    // if no port is specified manually, use the protocol default
	    opts.port = this.secure ? '443' : '80';
	  }

	  this.agent = opts.agent || false;
	  this.hostname = opts.hostname || (global.location ? location.hostname : 'localhost');
	  this.port = opts.port || (global.location && location.port ? location.port : this.secure ? 443 : 80);
	  this.query = opts.query || {};
	  if ('string' === typeof this.query) this.query = parseqs.decode(this.query);
	  this.upgrade = false !== opts.upgrade;
	  this.path = (opts.path || '/engine.io').replace(/\/$/, '') + '/';
	  this.forceJSONP = !!opts.forceJSONP;
	  this.jsonp = false !== opts.jsonp;
	  this.forceBase64 = !!opts.forceBase64;
	  this.enablesXDR = !!opts.enablesXDR;
	  this.timestampParam = opts.timestampParam || 't';
	  this.timestampRequests = opts.timestampRequests;
	  this.transports = opts.transports || ['polling', 'websocket'];
	  this.transportOptions = opts.transportOptions || {};
	  this.readyState = '';
	  this.writeBuffer = [];
	  this.prevBufferLen = 0;
	  this.policyPort = opts.policyPort || 843;
	  this.rememberUpgrade = opts.rememberUpgrade || false;
	  this.binaryType = null;
	  this.onlyBinaryUpgrades = opts.onlyBinaryUpgrades;
	  this.perMessageDeflate = false !== opts.perMessageDeflate ? opts.perMessageDeflate || {} : false;

	  if (true === this.perMessageDeflate) this.perMessageDeflate = {};
	  if (this.perMessageDeflate && null == this.perMessageDeflate.threshold) {
	    this.perMessageDeflate.threshold = 1024;
	  }

	  // SSL options for Node.js client
	  this.pfx = opts.pfx || null;
	  this.key = opts.key || null;
	  this.passphrase = opts.passphrase || null;
	  this.cert = opts.cert || null;
	  this.ca = opts.ca || null;
	  this.ciphers = opts.ciphers || null;
	  this.rejectUnauthorized = opts.rejectUnauthorized === undefined ? null : opts.rejectUnauthorized;
	  this.forceNode = !!opts.forceNode;

	  // other options for Node.js client
	  var freeGlobal = (typeof global === 'undefined' ? 'undefined' : _typeof(global)) === 'object' && global;
	  if (freeGlobal.global === freeGlobal) {
	    if (opts.extraHeaders && Object.keys(opts.extraHeaders).length > 0) {
	      this.extraHeaders = opts.extraHeaders;
	    }

	    if (opts.localAddress) {
	      this.localAddress = opts.localAddress;
	    }
	  }

	  // set on handshake
	  this.id = null;
	  this.upgrades = null;
	  this.pingInterval = null;
	  this.pingTimeout = null;

	  // set on heartbeat
	  this.pingIntervalTimer = null;
	  this.pingTimeoutTimer = null;

	  this.open();
	}

	Socket.priorWebsocketSuccess = false;

	/**
	 * Mix in `Emitter`.
	 */

	Emitter(Socket.prototype);

	/**
	 * Protocol version.
	 *
	 * @api public
	 */

	Socket.protocol = parser.protocol; // this is an int

	/**
	 * Expose deps for legacy compatibility
	 * and standalone browser access.
	 */

	Socket.Socket = Socket;
	Socket.Transport = __webpack_require__(8);
	Socket.transports = __webpack_require__(3);
	Socket.parser = __webpack_require__(9);

	/**
	 * Creates transport of the given type.
	 *
	 * @param {String} transport name
	 * @return {Transport}
	 * @api private
	 */

	Socket.prototype.createTransport = function (name) {
	  debug('creating transport "%s"', name);
	  var query = clone(this.query);

	  // append engine.io protocol identifier
	  query.EIO = parser.protocol;

	  // transport name
	  query.transport = name;

	  // per-transport options
	  var options = this.transportOptions[name] || {};

	  // session id if we already have one
	  if (this.id) query.sid = this.id;

	  var transport = new transports[name]({
	    query: query,
	    socket: this,
	    agent: options.agent || this.agent,
	    hostname: options.hostname || this.hostname,
	    port: options.port || this.port,
	    secure: options.secure || this.secure,
	    path: options.path || this.path,
	    forceJSONP: options.forceJSONP || this.forceJSONP,
	    jsonp: options.jsonp || this.jsonp,
	    forceBase64: options.forceBase64 || this.forceBase64,
	    enablesXDR: options.enablesXDR || this.enablesXDR,
	    timestampRequests: options.timestampRequests || this.timestampRequests,
	    timestampParam: options.timestampParam || this.timestampParam,
	    policyPort: options.policyPort || this.policyPort,
	    pfx: options.pfx || this.pfx,
	    key: options.key || this.key,
	    passphrase: options.passphrase || this.passphrase,
	    cert: options.cert || this.cert,
	    ca: options.ca || this.ca,
	    ciphers: options.ciphers || this.ciphers,
	    rejectUnauthorized: options.rejectUnauthorized || this.rejectUnauthorized,
	    perMessageDeflate: options.perMessageDeflate || this.perMessageDeflate,
	    extraHeaders: options.extraHeaders || this.extraHeaders,
	    forceNode: options.forceNode || this.forceNode,
	    localAddress: options.localAddress || this.localAddress,
	    requestTimeout: options.requestTimeout || this.requestTimeout,
	    protocols: options.protocols || void 0
	  });

	  return transport;
	};

	function clone(obj) {
	  var o = {};
	  for (var i in obj) {
	    if (obj.hasOwnProperty(i)) {
	      o[i] = obj[i];
	    }
	  }
	  return o;
	}

	/**
	 * Initializes transport to use and starts probe.
	 *
	 * @api private
	 */
	Socket.prototype.open = function () {
	  var transport;
	  if (this.rememberUpgrade && Socket.priorWebsocketSuccess && this.transports.indexOf('websocket') !== -1) {
	    transport = 'websocket';
	  } else if (0 === this.transports.length) {
	    // Emit error on next tick so it can be listened to
	    var self = this;
	    setTimeout(function () {
	      self.emit('error', 'No transports available');
	    }, 0);
	    return;
	  } else {
	    transport = this.transports[0];
	  }
	  this.readyState = 'opening';

	  // Retry with the next transport if the transport is disabled (jsonp: false)
	  try {
	    transport = this.createTransport(transport);
	  } catch (e) {
	    this.transports.shift();
	    this.open();
	    return;
	  }

	  transport.open();
	  this.setTransport(transport);
	};

	/**
	 * Sets the current transport. Disables the existing one (if any).
	 *
	 * @api private
	 */

	Socket.prototype.setTransport = function (transport) {
	  debug('setting transport %s', transport.name);
	  var self = this;

	  if (this.transport) {
	    debug('clearing existing transport %s', this.transport.name);
	    this.transport.removeAllListeners();
	  }

	  // set up transport
	  this.transport = transport;

	  // set up transport listeners
	  transport.on('drain', function () {
	    self.onDrain();
	  }).on('packet', function (packet) {
	    self.onPacket(packet);
	  }).on('error', function (e) {
	    self.onError(e);
	  }).on('close', function () {
	    self.onClose('transport close');
	  });
	};

	/**
	 * Probes a transport.
	 *
	 * @param {String} transport name
	 * @api private
	 */

	Socket.prototype.probe = function (name) {
	  debug('probing transport "%s"', name);
	  var transport = this.createTransport(name, { probe: 1 });
	  var failed = false;
	  var self = this;

	  Socket.priorWebsocketSuccess = false;

	  function onTransportOpen() {
	    if (self.onlyBinaryUpgrades) {
	      var upgradeLosesBinary = !this.supportsBinary && self.transport.supportsBinary;
	      failed = failed || upgradeLosesBinary;
	    }
	    if (failed) return;

	    debug('probe transport "%s" opened', name);
	    transport.send([{ type: 'ping', data: 'probe' }]);
	    transport.once('packet', function (msg) {
	      if (failed) return;
	      if ('pong' === msg.type && 'probe' === msg.data) {
	        debug('probe transport "%s" pong', name);
	        self.upgrading = true;
	        self.emit('upgrading', transport);
	        if (!transport) return;
	        Socket.priorWebsocketSuccess = 'websocket' === transport.name;

	        debug('pausing current transport "%s"', self.transport.name);
	        self.transport.pause(function () {
	          if (failed) return;
	          if ('closed' === self.readyState) return;
	          debug('changing transport and sending upgrade packet');

	          cleanup();

	          self.setTransport(transport);
	          transport.send([{ type: 'upgrade' }]);
	          self.emit('upgrade', transport);
	          transport = null;
	          self.upgrading = false;
	          self.flush();
	        });
	      } else {
	        debug('probe transport "%s" failed', name);
	        var err = new Error('probe error');
	        err.transport = transport.name;
	        self.emit('upgradeError', err);
	      }
	    });
	  }

	  function freezeTransport() {
	    if (failed) return;

	    // Any callback called by transport should be ignored since now
	    failed = true;

	    cleanup();

	    transport.close();
	    transport = null;
	  }

	  // Handle any error that happens while probing
	  function onerror(err) {
	    var error = new Error('probe error: ' + err);
	    error.transport = transport.name;

	    freezeTransport();

	    debug('probe transport "%s" failed because of error: %s', name, err);

	    self.emit('upgradeError', error);
	  }

	  function onTransportClose() {
	    onerror('transport closed');
	  }

	  // When the socket is closed while we're probing
	  function onclose() {
	    onerror('socket closed');
	  }

	  // When the socket is upgraded while we're probing
	  function onupgrade(to) {
	    if (transport && to.name !== transport.name) {
	      debug('"%s" works - aborting "%s"', to.name, transport.name);
	      freezeTransport();
	    }
	  }

	  // Remove all listeners on the transport and on self
	  function cleanup() {
	    transport.removeListener('open', onTransportOpen);
	    transport.removeListener('error', onerror);
	    transport.removeListener('close', onTransportClose);
	    self.removeListener('close', onclose);
	    self.removeListener('upgrading', onupgrade);
	  }

	  transport.once('open', onTransportOpen);
	  transport.once('error', onerror);
	  transport.once('close', onTransportClose);

	  this.once('close', onclose);
	  this.once('upgrading', onupgrade);

	  transport.open();
	};

	/**
	 * Called when connection is deemed open.
	 *
	 * @api public
	 */

	Socket.prototype.onOpen = function () {
	  debug('socket open');
	  this.readyState = 'open';
	  Socket.priorWebsocketSuccess = 'websocket' === this.transport.name;
	  this.emit('open');
	  this.flush();

	  // we check for `readyState` in case an `open`
	  // listener already closed the socket
	  if ('open' === this.readyState && this.upgrade && this.transport.pause) {
	    debug('starting upgrade probes');
	    for (var i = 0, l = this.upgrades.length; i < l; i++) {
	      this.probe(this.upgrades[i]);
	    }
	  }
	};

	/**
	 * Handles a packet.
	 *
	 * @api private
	 */

	Socket.prototype.onPacket = function (packet) {
	  if ('opening' === this.readyState || 'open' === this.readyState || 'closing' === this.readyState) {
	    debug('socket receive: type "%s", data "%s"', packet.type, packet.data);

	    this.emit('packet', packet);

	    // Socket is live - any packet counts
	    this.emit('heartbeat');

	    switch (packet.type) {
	      case 'open':
	        this.onHandshake(parsejson(packet.data));
	        break;

	      case 'pong':
	        this.setPing();
	        this.emit('pong');
	        break;

	      case 'error':
	        var err = new Error('server error');
	        err.code = packet.data;
	        this.onError(err);
	        break;

	      case 'message':
	        this.emit('data', packet.data);
	        this.emit('message', packet.data);
	        break;
	    }
	  } else {
	    debug('packet received with socket readyState "%s"', this.readyState);
	  }
	};

	/**
	 * Called upon handshake completion.
	 *
	 * @param {Object} handshake obj
	 * @api private
	 */

	Socket.prototype.onHandshake = function (data) {
	  this.emit('handshake', data);
	  this.id = data.sid;
	  this.transport.query.sid = data.sid;
	  this.upgrades = this.filterUpgrades(data.upgrades);
	  this.pingInterval = data.pingInterval;
	  this.pingTimeout = data.pingTimeout;
	  this.onOpen();
	  // In case open handler closes socket
	  if ('closed' === this.readyState) return;
	  this.setPing();

	  // Prolong liveness of socket on heartbeat
	  this.removeListener('heartbeat', this.onHeartbeat);
	  this.on('heartbeat', this.onHeartbeat);
	};

	/**
	 * Resets ping timeout.
	 *
	 * @api private
	 */

	Socket.prototype.onHeartbeat = function (timeout) {
	  clearTimeout(this.pingTimeoutTimer);
	  var self = this;
	  self.pingTimeoutTimer = setTimeout(function () {
	    if ('closed' === self.readyState) return;
	    self.onClose('ping timeout');
	  }, timeout || self.pingInterval + self.pingTimeout);
	};

	/**
	 * Pings server every `this.pingInterval` and expects response
	 * within `this.pingTimeout` or closes connection.
	 *
	 * @api private
	 */

	Socket.prototype.setPing = function () {
	  var self = this;
	  clearTimeout(self.pingIntervalTimer);
	  self.pingIntervalTimer = setTimeout(function () {
	    debug('writing ping packet - expecting pong within %sms', self.pingTimeout);
	    self.ping();
	    self.onHeartbeat(self.pingTimeout);
	  }, self.pingInterval);
	};

	/**
	* Sends a ping packet.
	*
	* @api private
	*/

	Socket.prototype.ping = function () {
	  var self = this;
	  this.sendPacket('ping', function () {
	    self.emit('ping');
	  });
	};

	/**
	 * Called on `drain` event
	 *
	 * @api private
	 */

	Socket.prototype.onDrain = function () {
	  this.writeBuffer.splice(0, this.prevBufferLen);

	  // setting prevBufferLen = 0 is very important
	  // for example, when upgrading, upgrade packet is sent over,
	  // and a nonzero prevBufferLen could cause problems on `drain`
	  this.prevBufferLen = 0;

	  if (0 === this.writeBuffer.length) {
	    this.emit('drain');
	  } else {
	    this.flush();
	  }
	};

	/**
	 * Flush write buffers.
	 *
	 * @api private
	 */

	Socket.prototype.flush = function () {
	  if ('closed' !== this.readyState && this.transport.writable && !this.upgrading && this.writeBuffer.length) {
	    debug('flushing %d packets in socket', this.writeBuffer.length);
	    this.transport.send(this.writeBuffer);
	    // keep track of current length of writeBuffer
	    // splice writeBuffer and callbackBuffer on `drain`
	    this.prevBufferLen = this.writeBuffer.length;
	    this.emit('flush');
	  }
	};

	/**
	 * Sends a message.
	 *
	 * @param {String} message.
	 * @param {Function} callback function.
	 * @param {Object} options.
	 * @return {Socket} for chaining.
	 * @api public
	 */

	Socket.prototype.write = Socket.prototype.send = function (msg, options, fn) {
	  this.sendPacket('message', msg, options, fn);
	  return this;
	};

	/**
	 * Sends a packet.
	 *
	 * @param {String} packet type.
	 * @param {String} data.
	 * @param {Object} options.
	 * @param {Function} callback function.
	 * @api private
	 */

	Socket.prototype.sendPacket = function (type, data, options, fn) {
	  if ('function' === typeof data) {
	    fn = data;
	    data = undefined;
	  }

	  if ('function' === typeof options) {
	    fn = options;
	    options = null;
	  }

	  if ('closing' === this.readyState || 'closed' === this.readyState) {
	    return;
	  }

	  options = options || {};
	  options.compress = false !== options.compress;

	  var packet = {
	    type: type,
	    data: data,
	    options: options
	  };
	  this.emit('packetCreate', packet);
	  this.writeBuffer.push(packet);
	  if (fn) this.once('flush', fn);
	  this.flush();
	};

	/**
	 * Closes the connection.
	 *
	 * @api private
	 */

	Socket.prototype.close = function () {
	  if ('opening' === this.readyState || 'open' === this.readyState) {
	    this.readyState = 'closing';

	    var self = this;

	    if (this.writeBuffer.length) {
	      this.once('drain', function () {
	        if (this.upgrading) {
	          waitForUpgrade();
	        } else {
	          close();
	        }
	      });
	    } else if (this.upgrading) {
	      waitForUpgrade();
	    } else {
	      close();
	    }
	  }

	  function close() {
	    self.onClose('forced close');
	    debug('socket closing - telling transport to close');
	    self.transport.close();
	  }

	  function cleanupAndClose() {
	    self.removeListener('upgrade', cleanupAndClose);
	    self.removeListener('upgradeError', cleanupAndClose);
	    close();
	  }

	  function waitForUpgrade() {
	    // wait for upgrade to finish since we can't send packets while pausing a transport
	    self.once('upgrade', cleanupAndClose);
	    self.once('upgradeError', cleanupAndClose);
	  }

	  return this;
	};

	/**
	 * Called upon transport error
	 *
	 * @api private
	 */

	Socket.prototype.onError = function (err) {
	  debug('socket error %j', err);
	  Socket.priorWebsocketSuccess = false;
	  this.emit('error', err);
	  this.onClose('transport error', err);
	};

	/**
	 * Called upon transport close.
	 *
	 * @api private
	 */

	Socket.prototype.onClose = function (reason, desc) {
	  if ('opening' === this.readyState || 'open' === this.readyState || 'closing' === this.readyState) {
	    debug('socket close with reason: "%s"', reason);
	    var self = this;

	    // clear timers
	    clearTimeout(this.pingIntervalTimer);
	    clearTimeout(this.pingTimeoutTimer);

	    // stop event from firing again for transport
	    this.transport.removeAllListeners('close');

	    // ensure transport won't stay open
	    this.transport.close();

	    // ignore further transport communication
	    this.transport.removeAllListeners();

	    // set ready state
	    this.readyState = 'closed';

	    // clear session id
	    this.id = null;

	    // emit close event
	    this.emit('close', reason, desc);

	    // clean buffers after, so users can still
	    // grab the buffers on `close` event
	    self.writeBuffer = [];
	    self.prevBufferLen = 0;
	  }
	};

	/**
	 * Filters upgrades, returning only those matching client transports.
	 *
	 * @param {Array} server upgrades
	 * @api private
	 *
	 */

	Socket.prototype.filterUpgrades = function (upgrades) {
	  var filteredUpgrades = [];
	  for (var i = 0, j = upgrades.length; i < j; i++) {
	    if (~index(this.transports, upgrades[i])) filteredUpgrades.push(upgrades[i]);
	  }
	  return filteredUpgrades;
	};
	/* WEBPACK VAR INJECTION */}.call(exports, (function() { return this; }())));

/***/ },
/* 3 */
/***/ function(module, exports, __webpack_require__) {

	/* WEBPACK VAR INJECTION */(function(global) {'use strict';

	/**
	 * Module dependencies
	 */

	var XMLHttpRequest = __webpack_require__(4);
	var XHR = __webpack_require__(6);
	var JSONP = __webpack_require__(27);
	var websocket = __webpack_require__(28);

	/**
	 * Export transports.
	 */

	exports.polling = polling;
	exports.websocket = websocket;

	/**
	 * Polling transport polymorphic constructor.
	 * Decides on xhr vs jsonp based on feature detection.
	 *
	 * @api private
	 */

	function polling(opts) {
	  var xhr;
	  var xd = false;
	  var xs = false;
	  var jsonp = false !== opts.jsonp;

	  if (global.location) {
	    var isSSL = 'https:' === location.protocol;
	    var port = location.port;

	    // some user agents have empty `location.port`
	    if (!port) {
	      port = isSSL ? 443 : 80;
	    }

	    xd = opts.hostname !== location.hostname || port !== opts.port;
	    xs = opts.secure !== isSSL;
	  }

	  opts.xdomain = xd;
	  opts.xscheme = xs;
	  xhr = new XMLHttpRequest(opts);

	  if ('open' in xhr && !opts.forceJSONP) {
	    return new XHR(opts);
	  } else {
	    if (!jsonp) throw new Error('JSONP disabled');
	    return new JSONP(opts);
	  }
	}
	/* WEBPACK VAR INJECTION */}.call(exports, (function() { return this; }())));

/***/ },
/* 4 */
/***/ function(module, exports, __webpack_require__) {

	/* WEBPACK VAR INJECTION */(function(global) {'use strict';

	// browser shim for xmlhttprequest module

	var hasCORS = __webpack_require__(5);

	module.exports = function (opts) {
	  var xdomain = opts.xdomain;

	  // scheme must be same when usign XDomainRequest
	  // http://blogs.msdn.com/b/ieinternals/archive/2010/05/13/xdomainrequest-restrictions-limitations-and-workarounds.aspx
	  var xscheme = opts.xscheme;

	  // XDomainRequest has a flow of not sending cookie, therefore it should be disabled as a default.
	  // https://github.com/Automattic/engine.io-client/pull/217
	  var enablesXDR = opts.enablesXDR;

	  // XMLHttpRequest can be disabled on IE
	  try {
	    if ('undefined' !== typeof XMLHttpRequest && (!xdomain || hasCORS)) {
	      return new XMLHttpRequest();
	    }
	  } catch (e) {}

	  // Use XDomainRequest for IE8 if enablesXDR is true
	  // because loading bar keeps flashing when using jsonp-polling
	  // https://github.com/yujiosaka/socke.io-ie8-loading-example
	  try {
	    if ('undefined' !== typeof XDomainRequest && !xscheme && enablesXDR) {
	      return new XDomainRequest();
	    }
	  } catch (e) {}

	  if (!xdomain) {
	    try {
	      return new global[['Active'].concat('Object').join('X')]('Microsoft.XMLHTTP');
	    } catch (e) {}
	  }
	};
	/* WEBPACK VAR INJECTION */}.call(exports, (function() { return this; }())));

/***/ },
/* 5 */
/***/ function(module, exports) {

	
	/**
	 * Module exports.
	 *
	 * Logic borrowed from Modernizr:
	 *
	 *   - https://github.com/Modernizr/Modernizr/blob/master/feature-detects/cors.js
	 */

	try {
	  module.exports = typeof XMLHttpRequest !== 'undefined' &&
	    'withCredentials' in new XMLHttpRequest();
	} catch (err) {
	  // if XMLHttp support is disabled in IE then it will throw
	  // when trying to create
	  module.exports = false;
	}


/***/ },
/* 6 */
/***/ function(module, exports, __webpack_require__) {

	/* WEBPACK VAR INJECTION */(function(global) {'use strict';

	/**
	 * Module requirements.
	 */

	var XMLHttpRequest = __webpack_require__(4);
	var Polling = __webpack_require__(7);
	var Emitter = __webpack_require__(19);
	var inherit = __webpack_require__(21);
	var debug = __webpack_require__(23)('engine.io-client:polling-xhr');

	/**
	 * Module exports.
	 */

	module.exports = XHR;
	module.exports.Request = Request;

	/**
	 * Empty function
	 */

	function empty() {}

	/**
	 * XHR Polling constructor.
	 *
	 * @param {Object} opts
	 * @api public
	 */

	function XHR(opts) {
	  Polling.call(this, opts);
	  this.requestTimeout = opts.requestTimeout;
	  this.extraHeaders = opts.extraHeaders;

	  if (global.location) {
	    var isSSL = 'https:' === location.protocol;
	    var port = location.port;

	    // some user agents have empty `location.port`
	    if (!port) {
	      port = isSSL ? 443 : 80;
	    }

	    this.xd = opts.hostname !== global.location.hostname || port !== opts.port;
	    this.xs = opts.secure !== isSSL;
	  }
	}

	/**
	 * Inherits from Polling.
	 */

	inherit(XHR, Polling);

	/**
	 * XHR supports binary
	 */

	XHR.prototype.supportsBinary = true;

	/**
	 * Creates a request.
	 *
	 * @param {String} method
	 * @api private
	 */

	XHR.prototype.request = function (opts) {
	  opts = opts || {};
	  opts.uri = this.uri();
	  opts.xd = this.xd;
	  opts.xs = this.xs;
	  opts.agent = this.agent || false;
	  opts.supportsBinary = this.supportsBinary;
	  opts.enablesXDR = this.enablesXDR;

	  // SSL options for Node.js client
	  opts.pfx = this.pfx;
	  opts.key = this.key;
	  opts.passphrase = this.passphrase;
	  opts.cert = this.cert;
	  opts.ca = this.ca;
	  opts.ciphers = this.ciphers;
	  opts.rejectUnauthorized = this.rejectUnauthorized;
	  opts.requestTimeout = this.requestTimeout;

	  // other options for Node.js client
	  opts.extraHeaders = this.extraHeaders;

	  return new Request(opts);
	};

	/**
	 * Sends data.
	 *
	 * @param {String} data to send.
	 * @param {Function} called upon flush.
	 * @api private
	 */

	XHR.prototype.doWrite = function (data, fn) {
	  var isBinary = typeof data !== 'string' && data !== undefined;
	  var req = this.request({ method: 'POST', data: data, isBinary: isBinary });
	  var self = this;
	  req.on('success', fn);
	  req.on('error', function (err) {
	    self.onError('xhr post error', err);
	  });
	  this.sendXhr = req;
	};

	/**
	 * Starts a poll cycle.
	 *
	 * @api private
	 */

	XHR.prototype.doPoll = function () {
	  debug('xhr poll');
	  var req = this.request();
	  var self = this;
	  req.on('data', function (data) {
	    self.onData(data);
	  });
	  req.on('error', function (err) {
	    self.onError('xhr poll error', err);
	  });
	  this.pollXhr = req;
	};

	/**
	 * Request constructor
	 *
	 * @param {Object} options
	 * @api public
	 */

	function Request(opts) {
	  this.method = opts.method || 'GET';
	  this.uri = opts.uri;
	  this.xd = !!opts.xd;
	  this.xs = !!opts.xs;
	  this.async = false !== opts.async;
	  this.data = undefined !== opts.data ? opts.data : null;
	  this.agent = opts.agent;
	  this.isBinary = opts.isBinary;
	  this.supportsBinary = opts.supportsBinary;
	  this.enablesXDR = opts.enablesXDR;
	  this.requestTimeout = opts.requestTimeout;

	  // SSL options for Node.js client
	  this.pfx = opts.pfx;
	  this.key = opts.key;
	  this.passphrase = opts.passphrase;
	  this.cert = opts.cert;
	  this.ca = opts.ca;
	  this.ciphers = opts.ciphers;
	  this.rejectUnauthorized = opts.rejectUnauthorized;

	  // other options for Node.js client
	  this.extraHeaders = opts.extraHeaders;

	  this.create();
	}

	/**
	 * Mix in `Emitter`.
	 */

	Emitter(Request.prototype);

	/**
	 * Creates the XHR object and sends the request.
	 *
	 * @api private
	 */

	Request.prototype.create = function () {
	  var opts = { agent: this.agent, xdomain: this.xd, xscheme: this.xs, enablesXDR: this.enablesXDR };

	  // SSL options for Node.js client
	  opts.pfx = this.pfx;
	  opts.key = this.key;
	  opts.passphrase = this.passphrase;
	  opts.cert = this.cert;
	  opts.ca = this.ca;
	  opts.ciphers = this.ciphers;
	  opts.rejectUnauthorized = this.rejectUnauthorized;

	  var xhr = this.xhr = new XMLHttpRequest(opts);
	  var self = this;

	  try {
	    debug('xhr open %s: %s', this.method, this.uri);
	    xhr.open(this.method, this.uri, this.async);
	    try {
	      if (this.extraHeaders) {
	        xhr.setDisableHeaderCheck && xhr.setDisableHeaderCheck(true);
	        for (var i in this.extraHeaders) {
	          if (this.extraHeaders.hasOwnProperty(i)) {
	            xhr.setRequestHeader(i, this.extraHeaders[i]);
	          }
	        }
	      }
	    } catch (e) {}
	    if (this.supportsBinary) {
	      // This has to be done after open because Firefox is stupid
	      // http://stackoverflow.com/questions/13216903/get-binary-data-with-xmlhttprequest-in-a-firefox-extension
	      xhr.responseType = 'arraybuffer';
	    }

	    if ('POST' === this.method) {
	      try {
	        if (this.isBinary) {
	          xhr.setRequestHeader('Content-type', 'application/octet-stream');
	        } else {
	          xhr.setRequestHeader('Content-type', 'text/plain;charset=UTF-8');
	        }
	      } catch (e) {}
	    }

	    try {
	      xhr.setRequestHeader('Accept', '*/*');
	    } catch (e) {}

	    // ie6 check
	    if ('withCredentials' in xhr) {
	      xhr.withCredentials = true;
	    }

	    if (this.requestTimeout) {
	      xhr.timeout = this.requestTimeout;
	    }

	    if (this.hasXDR()) {
	      xhr.onload = function () {
	        self.onLoad();
	      };
	      xhr.onerror = function () {
	        self.onError(xhr.responseText);
	      };
	    } else {
	      xhr.onreadystatechange = function () {
	        if (4 !== xhr.readyState) return;
	        if (200 === xhr.status || 1223 === xhr.status) {
	          self.onLoad();
	        } else {
	          // make sure the `error` event handler that's user-set
	          // does not throw in the same tick and gets caught here
	          setTimeout(function () {
	            self.onError(xhr.status);
	          }, 0);
	        }
	      };
	    }

	    debug('xhr data %s', this.data);
	    xhr.send(this.data);
	  } catch (e) {
	    // Need to defer since .create() is called directly fhrom the constructor
	    // and thus the 'error' event can only be only bound *after* this exception
	    // occurs.  Therefore, also, we cannot throw here at all.
	    setTimeout(function () {
	      self.onError(e);
	    }, 0);
	    return;
	  }

	  if (global.document) {
	    this.index = Request.requestsCount++;
	    Request.requests[this.index] = this;
	  }
	};

	/**
	 * Called upon successful response.
	 *
	 * @api private
	 */

	Request.prototype.onSuccess = function () {
	  this.emit('success');
	  this.cleanup();
	};

	/**
	 * Called if we have data.
	 *
	 * @api private
	 */

	Request.prototype.onData = function (data) {
	  this.emit('data', data);
	  this.onSuccess();
	};

	/**
	 * Called upon error.
	 *
	 * @api private
	 */

	Request.prototype.onError = function (err) {
	  this.emit('error', err);
	  this.cleanup(true);
	};

	/**
	 * Cleans up house.
	 *
	 * @api private
	 */

	Request.prototype.cleanup = function (fromError) {
	  if ('undefined' === typeof this.xhr || null === this.xhr) {
	    return;
	  }
	  // xmlhttprequest
	  if (this.hasXDR()) {
	    this.xhr.onload = this.xhr.onerror = empty;
	  } else {
	    this.xhr.onreadystatechange = empty;
	  }

	  if (fromError) {
	    try {
	      this.xhr.abort();
	    } catch (e) {}
	  }

	  if (global.document) {
	    delete Request.requests[this.index];
	  }

	  this.xhr = null;
	};

	/**
	 * Called upon load.
	 *
	 * @api private
	 */

	Request.prototype.onLoad = function () {
	  var data;
	  try {
	    var contentType;
	    try {
	      contentType = this.xhr.getResponseHeader('Content-Type').split(';')[0];
	    } catch (e) {}
	    if (contentType === 'application/octet-stream') {
	      data = this.xhr.response || this.xhr.responseText;
	    } else {
	      if (!this.supportsBinary) {
	        data = this.xhr.responseText;
	      } else {
	        try {
	          data = String.fromCharCode.apply(null, new Uint8Array(this.xhr.response));
	        } catch (e) {
	          var ui8Arr = new Uint8Array(this.xhr.response);
	          var dataArray = [];
	          for (var idx = 0, length = ui8Arr.length; idx < length; idx++) {
	            dataArray.push(ui8Arr[idx]);
	          }

	          data = String.fromCharCode.apply(null, dataArray);
	        }
	      }
	    }
	  } catch (e) {
	    this.onError(e);
	  }
	  if (null != data) {
	    this.onData(data);
	  }
	};

	/**
	 * Check if it has XDomainRequest.
	 *
	 * @api private
	 */

	Request.prototype.hasXDR = function () {
	  return 'undefined' !== typeof global.XDomainRequest && !this.xs && this.enablesXDR;
	};

	/**
	 * Aborts the request.
	 *
	 * @api public
	 */

	Request.prototype.abort = function () {
	  this.cleanup();
	};

	/**
	 * Aborts pending requests when unloading the window. This is needed to prevent
	 * memory leaks (e.g. when using IE) and to ensure that no spurious error is
	 * emitted.
	 */

	Request.requestsCount = 0;
	Request.requests = {};

	if (global.document) {
	  if (global.attachEvent) {
	    global.attachEvent('onunload', unloadHandler);
	  } else if (global.addEventListener) {
	    global.addEventListener('beforeunload', unloadHandler, false);
	  }
	}

	function unloadHandler() {
	  for (var i in Request.requests) {
	    if (Request.requests.hasOwnProperty(i)) {
	      Request.requests[i].abort();
	    }
	  }
	}
	/* WEBPACK VAR INJECTION */}.call(exports, (function() { return this; }())));

/***/ },
/* 7 */
/***/ function(module, exports, __webpack_require__) {

	'use strict';

	/**
	 * Module dependencies.
	 */

	var Transport = __webpack_require__(8);
	var parseqs = __webpack_require__(20);
	var parser = __webpack_require__(9);
	var inherit = __webpack_require__(21);
	var yeast = __webpack_require__(22);
	var debug = __webpack_require__(23)('engine.io-client:polling');

	/**
	 * Module exports.
	 */

	module.exports = Polling;

	/**
	 * Is XHR2 supported?
	 */

	var hasXHR2 = function () {
	  var XMLHttpRequest = __webpack_require__(4);
	  var xhr = new XMLHttpRequest({ xdomain: false });
	  return null != xhr.responseType;
	}();

	/**
	 * Polling interface.
	 *
	 * @param {Object} opts
	 * @api private
	 */

	function Polling(opts) {
	  var forceBase64 = opts && opts.forceBase64;
	  if (!hasXHR2 || forceBase64) {
	    this.supportsBinary = false;
	  }
	  Transport.call(this, opts);
	}

	/**
	 * Inherits from Transport.
	 */

	inherit(Polling, Transport);

	/**
	 * Transport name.
	 */

	Polling.prototype.name = 'polling';

	/**
	 * Opens the socket (triggers polling). We write a PING message to determine
	 * when the transport is open.
	 *
	 * @api private
	 */

	Polling.prototype.doOpen = function () {
	  this.poll();
	};

	/**
	 * Pauses polling.
	 *
	 * @param {Function} callback upon buffers are flushed and transport is paused
	 * @api private
	 */

	Polling.prototype.pause = function (onPause) {
	  var self = this;

	  this.readyState = 'pausing';

	  function pause() {
	    debug('paused');
	    self.readyState = 'paused';
	    onPause();
	  }

	  if (this.polling || !this.writable) {
	    var total = 0;

	    if (this.polling) {
	      debug('we are currently polling - waiting to pause');
	      total++;
	      this.once('pollComplete', function () {
	        debug('pre-pause polling complete');
	        --total || pause();
	      });
	    }

	    if (!this.writable) {
	      debug('we are currently writing - waiting to pause');
	      total++;
	      this.once('drain', function () {
	        debug('pre-pause writing complete');
	        --total || pause();
	      });
	    }
	  } else {
	    pause();
	  }
	};

	/**
	 * Starts polling cycle.
	 *
	 * @api public
	 */

	Polling.prototype.poll = function () {
	  debug('polling');
	  this.polling = true;
	  this.doPoll();
	  this.emit('poll');
	};

	/**
	 * Overloads onData to detect payloads.
	 *
	 * @api private
	 */

	Polling.prototype.onData = function (data) {
	  var self = this;
	  debug('polling got data %s', data);
	  var callback = function callback(packet, index, total) {
	    // if its the first message we consider the transport open
	    if ('opening' === self.readyState) {
	      self.onOpen();
	    }

	    // if its a close packet, we close the ongoing requests
	    if ('close' === packet.type) {
	      self.onClose();
	      return false;
	    }

	    // otherwise bypass onData and handle the message
	    self.onPacket(packet);
	  };

	  // decode payload
	  parser.decodePayload(data, this.socket.binaryType, this.supportsBinary, callback);

	  // if an event did not trigger closing
	  if ('closed' !== this.readyState) {
	    // if we got data we're not polling
	    this.polling = false;
	    this.emit('pollComplete');

	    if ('open' === this.readyState) {
	      this.poll();
	    } else {
	      debug('ignoring poll - transport state "%s"', this.readyState);
	    }
	  }
	};

	/**
	 * For polling, send a close packet.
	 *
	 * @api private
	 */

	Polling.prototype.doClose = function () {
	  var self = this;

	  function close() {
	    debug('writing close packet');
	    self.write([{ type: 'close' }]);
	  }

	  if ('open' === this.readyState) {
	    debug('transport open - closing');
	    close();
	  } else {
	    // in case we're trying to close while
	    // handshaking is in progress (GH-164)
	    debug('transport not open - deferring close');
	    this.once('open', close);
	  }
	};

	/**
	 * Writes a packets payload.
	 *
	 * @param {Array} data packets
	 * @param {Function} drain callback
	 * @api private
	 */

	Polling.prototype.write = function (packets) {
	  var self = this;
	  this.writable = false;
	  var callbackfn = function callbackfn() {
	    self.writable = true;
	    self.emit('drain');
	  };

	  parser.encodePayload(packets, this.supportsBinary, function (data) {
	    self.doWrite(data, callbackfn);
	  });
	};

	/**
	 * Generates uri for connection.
	 *
	 * @api private
	 */

	Polling.prototype.uri = function () {
	  var query = this.query || {};
	  var schema = this.secure ? 'https' : 'http';
	  var port = '';

	  // cache busting is forced
	  if (false !== this.timestampRequests) {
	    query[this.timestampParam] = yeast();
	  }

	  if (!this.supportsBinary && !query.sid) {
	    query.b64 = 1;
	  }

	  query = parseqs.encode(query);

	  // avoid port if default for schema
	  if (this.port && ('https' === schema && Number(this.port) !== 443 || 'http' === schema && Number(this.port) !== 80)) {
	    port = ':' + this.port;
	  }

	  // prepend ? to query
	  if (query.length) {
	    query = '?' + query;
	  }

	  var ipv6 = this.hostname.indexOf(':') !== -1;
	  return schema + '://' + (ipv6 ? '[' + this.hostname + ']' : this.hostname) + port + this.path + query;
	};

/***/ },
/* 8 */
/***/ function(module, exports, __webpack_require__) {

	'use strict';

	/**
	 * Module dependencies.
	 */

	var parser = __webpack_require__(9);
	var Emitter = __webpack_require__(19);

	/**
	 * Module exports.
	 */

	module.exports = Transport;

	/**
	 * Transport abstract constructor.
	 *
	 * @param {Object} options.
	 * @api private
	 */

	function Transport(opts) {
	  this.path = opts.path;
	  this.hostname = opts.hostname;
	  this.port = opts.port;
	  this.secure = opts.secure;
	  this.query = opts.query;
	  this.timestampParam = opts.timestampParam;
	  this.timestampRequests = opts.timestampRequests;
	  this.readyState = '';
	  this.agent = opts.agent || false;
	  this.socket = opts.socket;
	  this.enablesXDR = opts.enablesXDR;

	  // SSL options for Node.js client
	  this.pfx = opts.pfx;
	  this.key = opts.key;
	  this.passphrase = opts.passphrase;
	  this.cert = opts.cert;
	  this.ca = opts.ca;
	  this.ciphers = opts.ciphers;
	  this.rejectUnauthorized = opts.rejectUnauthorized;
	  this.forceNode = opts.forceNode;

	  // other options for Node.js client
	  this.extraHeaders = opts.extraHeaders;
	  this.localAddress = opts.localAddress;
	}

	/**
	 * Mix in `Emitter`.
	 */

	Emitter(Transport.prototype);

	/**
	 * Emits an error.
	 *
	 * @param {String} str
	 * @return {Transport} for chaining
	 * @api public
	 */

	Transport.prototype.onError = function (msg, desc) {
	  var err = new Error(msg);
	  err.type = 'TransportError';
	  err.description = desc;
	  this.emit('error', err);
	  return this;
	};

	/**
	 * Opens the transport.
	 *
	 * @api public
	 */

	Transport.prototype.open = function () {
	  if ('closed' === this.readyState || '' === this.readyState) {
	    this.readyState = 'opening';
	    this.doOpen();
	  }

	  return this;
	};

	/**
	 * Closes the transport.
	 *
	 * @api private
	 */

	Transport.prototype.close = function () {
	  if ('opening' === this.readyState || 'open' === this.readyState) {
	    this.doClose();
	    this.onClose();
	  }

	  return this;
	};

	/**
	 * Sends multiple packets.
	 *
	 * @param {Array} packets
	 * @api private
	 */

	Transport.prototype.send = function (packets) {
	  if ('open' === this.readyState) {
	    this.write(packets);
	  } else {
	    throw new Error('Transport not open');
	  }
	};

	/**
	 * Called upon open
	 *
	 * @api private
	 */

	Transport.prototype.onOpen = function () {
	  this.readyState = 'open';
	  this.writable = true;
	  this.emit('open');
	};

	/**
	 * Called with data.
	 *
	 * @param {String} data
	 * @api private
	 */

	Transport.prototype.onData = function (data) {
	  var packet = parser.decodePacket(data, this.socket.binaryType);
	  this.onPacket(packet);
	};

	/**
	 * Called with a decoded packet.
	 */

	Transport.prototype.onPacket = function (packet) {
	  this.emit('packet', packet);
	};

	/**
	 * Called upon close.
	 *
	 * @api private
	 */

	Transport.prototype.onClose = function () {
	  this.readyState = 'closed';
	  this.emit('close');
	};

/***/ },
/* 9 */
/***/ function(module, exports, __webpack_require__) {

	/* WEBPACK VAR INJECTION */(function(global) {/**
	 * Module dependencies.
	 */

	var keys = __webpack_require__(10);
	var hasBinary = __webpack_require__(11);
	var sliceBuffer = __webpack_require__(13);
	var after = __webpack_require__(14);
	var utf8 = __webpack_require__(15);

	var base64encoder;
	if (global && global.ArrayBuffer) {
	  base64encoder = __webpack_require__(17);
	}

	/**
	 * Check if we are running an android browser. That requires us to use
	 * ArrayBuffer with polling transports...
	 *
	 * http://ghinda.net/jpeg-blob-ajax-android/
	 */

	var isAndroid = typeof navigator !== 'undefined' && /Android/i.test(navigator.userAgent);

	/**
	 * Check if we are running in PhantomJS.
	 * Uploading a Blob with PhantomJS does not work correctly, as reported here:
	 * https://github.com/ariya/phantomjs/issues/11395
	 * @type boolean
	 */
	var isPhantomJS = typeof navigator !== 'undefined' && /PhantomJS/i.test(navigator.userAgent);

	/**
	 * When true, avoids using Blobs to encode payloads.
	 * @type boolean
	 */
	var dontSendBlobs = isAndroid || isPhantomJS;

	/**
	 * Current protocol version.
	 */

	exports.protocol = 3;

	/**
	 * Packet types.
	 */

	var packets = exports.packets = {
	    open:     0    // non-ws
	  , close:    1    // non-ws
	  , ping:     2
	  , pong:     3
	  , message:  4
	  , upgrade:  5
	  , noop:     6
	};

	var packetslist = keys(packets);

	/**
	 * Premade error packet.
	 */

	var err = { type: 'error', data: 'parser error' };

	/**
	 * Create a blob api even for blob builder when vendor prefixes exist
	 */

	var Blob = __webpack_require__(18);

	/**
	 * Encodes a packet.
	 *
	 *     <packet type id> [ <data> ]
	 *
	 * Example:
	 *
	 *     5hello world
	 *     3
	 *     4
	 *
	 * Binary is encoded in an identical principle
	 *
	 * @api private
	 */

	exports.encodePacket = function (packet, supportsBinary, utf8encode, callback) {
	  if (typeof supportsBinary === 'function') {
	    callback = supportsBinary;
	    supportsBinary = false;
	  }

	  if (typeof utf8encode === 'function') {
	    callback = utf8encode;
	    utf8encode = null;
	  }

	  var data = (packet.data === undefined)
	    ? undefined
	    : packet.data.buffer || packet.data;

	  if (global.ArrayBuffer && data instanceof ArrayBuffer) {
	    return encodeArrayBuffer(packet, supportsBinary, callback);
	  } else if (Blob && data instanceof global.Blob) {
	    return encodeBlob(packet, supportsBinary, callback);
	  }

	  // might be an object with { base64: true, data: dataAsBase64String }
	  if (data && data.base64) {
	    return encodeBase64Object(packet, callback);
	  }

	  // Sending data as a utf-8 string
	  var encoded = packets[packet.type];

	  // data fragment is optional
	  if (undefined !== packet.data) {
	    encoded += utf8encode ? utf8.encode(String(packet.data), { strict: false }) : String(packet.data);
	  }

	  return callback('' + encoded);

	};

	function encodeBase64Object(packet, callback) {
	  // packet data is an object { base64: true, data: dataAsBase64String }
	  var message = 'b' + exports.packets[packet.type] + packet.data.data;
	  return callback(message);
	}

	/**
	 * Encode packet helpers for binary types
	 */

	function encodeArrayBuffer(packet, supportsBinary, callback) {
	  if (!supportsBinary) {
	    return exports.encodeBase64Packet(packet, callback);
	  }

	  var data = packet.data;
	  var contentArray = new Uint8Array(data);
	  var resultBuffer = new Uint8Array(1 + data.byteLength);

	  resultBuffer[0] = packets[packet.type];
	  for (var i = 0; i < contentArray.length; i++) {
	    resultBuffer[i+1] = contentArray[i];
	  }

	  return callback(resultBuffer.buffer);
	}

	function encodeBlobAsArrayBuffer(packet, supportsBinary, callback) {
	  if (!supportsBinary) {
	    return exports.encodeBase64Packet(packet, callback);
	  }

	  var fr = new FileReader();
	  fr.onload = function() {
	    packet.data = fr.result;
	    exports.encodePacket(packet, supportsBinary, true, callback);
	  };
	  return fr.readAsArrayBuffer(packet.data);
	}

	function encodeBlob(packet, supportsBinary, callback) {
	  if (!supportsBinary) {
	    return exports.encodeBase64Packet(packet, callback);
	  }

	  if (dontSendBlobs) {
	    return encodeBlobAsArrayBuffer(packet, supportsBinary, callback);
	  }

	  var length = new Uint8Array(1);
	  length[0] = packets[packet.type];
	  var blob = new Blob([length.buffer, packet.data]);

	  return callback(blob);
	}

	/**
	 * Encodes a packet with binary data in a base64 string
	 *
	 * @param {Object} packet, has `type` and `data`
	 * @return {String} base64 encoded message
	 */

	exports.encodeBase64Packet = function(packet, callback) {
	  var message = 'b' + exports.packets[packet.type];
	  if (Blob && packet.data instanceof global.Blob) {
	    var fr = new FileReader();
	    fr.onload = function() {
	      var b64 = fr.result.split(',')[1];
	      callback(message + b64);
	    };
	    return fr.readAsDataURL(packet.data);
	  }

	  var b64data;
	  try {
	    b64data = String.fromCharCode.apply(null, new Uint8Array(packet.data));
	  } catch (e) {
	    // iPhone Safari doesn't let you apply with typed arrays
	    var typed = new Uint8Array(packet.data);
	    var basic = new Array(typed.length);
	    for (var i = 0; i < typed.length; i++) {
	      basic[i] = typed[i];
	    }
	    b64data = String.fromCharCode.apply(null, basic);
	  }
	  message += global.btoa(b64data);
	  return callback(message);
	};

	/**
	 * Decodes a packet. Changes format to Blob if requested.
	 *
	 * @return {Object} with `type` and `data` (if any)
	 * @api private
	 */

	exports.decodePacket = function (data, binaryType, utf8decode) {
	  if (data === undefined) {
	    return err;
	  }
	  // String data
	  if (typeof data === 'string') {
	    if (data.charAt(0) === 'b') {
	      return exports.decodeBase64Packet(data.substr(1), binaryType);
	    }

	    if (utf8decode) {
	      data = tryDecode(data);
	      if (data === false) {
	        return err;
	      }
	    }
	    var type = data.charAt(0);

	    if (Number(type) != type || !packetslist[type]) {
	      return err;
	    }

	    if (data.length > 1) {
	      return { type: packetslist[type], data: data.substring(1) };
	    } else {
	      return { type: packetslist[type] };
	    }
	  }

	  var asArray = new Uint8Array(data