(function UMDish(name, context, definition, plugins) {
  context[name] = definition.call(context);
  for (var i = 0; i < plugins.length; i++) {
    plugins[i](context[name])
  }
  if (typeof module !== "undefined" && module.exports) {
    module.exports = context[name];
  } else if (typeof define === "function" && define.amd) {
    define(function reference() { return context[name]; });
  }
})("Primus", this || {}, function wrapper() {
  var define, module, exports
    , Primus = (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(_dereq_,module,exports){
'use strict';

/**
 * Create a function that will cleanup the instance.
 *
 * @param {Array|String} keys Properties on the instance that needs to be cleared.
 * @param {Object} options Additional configuration.
 * @returns {Function} Destroy function
 * @api public
 */
module.exports = function demolish(keys, options) {
  var split = /[, ]+/;

  options = options ||  {};
  keys = keys || [];

  if ('string' === typeof keys) keys = keys.split(split);

  /**
   * Run addition cleanup hooks.
   *
   * @param {String} key Name of the clean up hook to run.
   * @param {Mixed} selfie Reference to the instance we're cleaning up.
   * @api private
   */
  function run(key, selfie) {
    if (!options[key]) return;
    if ('string' === typeof options[key]) options[key] = options[key].split(split);
    if ('function' === typeof options[key]) return options[key].call(selfie);

    for (var i = 0, type, what; i < options[key].length; i++) {
      what = options[key][i];
      type = typeof what;

      if ('function' === type) {
        what.call(selfie);
      } else if ('string' === type && 'function' === typeof selfie[what]) {
        selfie[what]();
      }
    }
  }

  /**
   * Destroy the instance completely and clean up all the existing references.
   *
   * @returns {Boolean}
   * @api public
   */
  return function destroy() {
    var selfie = this
      , i = 0
      , prop;

    if (selfie[keys[0]] === null) return false;
    run('before', selfie);

    for (; i < keys.length; i++) {
      prop = keys[i];

      if (selfie[prop]) {
        if ('function' === typeof selfie[prop].destroy) selfie[prop].destroy();
        selfie[prop] = null;
      }
    }

    if (selfie.emit) selfie.emit('destroy');
    run('after', selfie);

    return true;
  };
};

},{}],2:[function(_dereq_,module,exports){
'use strict';

/**
 * Returns a function that when invoked executes all the listeners of the
 * given event with the given arguments.
 *
 * @returns {Function} The function that emits all the things.
 * @api public
 */
module.exports = function emits() {
  var self = this
    , parser;

  for (var i = 0, l = arguments.length, args = new Array(l); i < l; i++) {
    args[i] = arguments[i];
  }

  //
  // If the last argument is a function, assume that it's a parser.
  //
  if ('function' !== typeof args[args.length - 1]) return function emitter() {
    for (var i = 0, l = arguments.length, arg = new Array(l); i < l; i++) {
      arg[i] = arguments[i];
    }

    return self.emit.apply(self, args.concat(arg));
  };

  parser = args.pop();

  /**
   * The actual function that emits the given event. It returns a boolean
   * indicating if the event was emitted.
   *
   * @returns {Boolean}
   * @api public
   */
  return function emitter() {
    for (var i = 0, l = arguments.length, arg = new Array(l + 1); i < l; i++) {
      arg[i + 1] = arguments[i];
    }

    /**
     * Async completion method for the parser.
     *
     * @param {Error} err Optional error when parsing failed.
     * @param {Mixed} returned Emit instructions.
     * @api private
     */
    arg[0] = function next(err, returned) {
      if (err) return self.emit('error', err);

      arg = returned === undefined
        ? arg.slice(1) : returned === null
          ? [] : returned;

      self.emit.apply(self, args.concat(arg));
    };

    parser.apply(self, arg);
    return true;
  };
};

},{}],3:[function(_dereq_,module,exports){
'use strict';

var has = Object.prototype.hasOwnProperty
  , prefix = '~';

/**
 * Constructor to create a storage for our `EE` objects.
 * An `Events` instance is a plain object whose properties are event names.
 *
 * @constructor
 * @private
 */
function Events() {}

//
// We try to not inherit from `Object.prototype`. In some engines creating an
// instance in this way is faster than calling `Object.create(null)` directly.
// If `Object.create(null)` is not supported we prefix the event names with a
// character to make sure that the built-in object properties are not
// overridden or used as an attack vector.
//
if (Object.create) {
  Events.prototype = Object.create(null);

  //
  // This hack is needed because the `__proto__` property is still inherited in
  // some old browsers like Android 4, iPhone 5.1, Opera 11 and Safari 5.
  //
  if (!new Events().__proto__) prefix = false;
}

/**
 * Representation of a single event listener.
 *
 * @param {Function} fn The listener function.
 * @param {*} context The context to invoke the listener with.
 * @param {Boolean} [once=false] Specify if the listener is a one-time listener.
 * @constructor
 * @private
 */
function EE(fn, context, once) {
  this.fn = fn;
  this.context = context;
  this.once = once || false;
}

/**
 * Add a listener for a given event.
 *
 * @param {EventEmitter} emitter Reference to the `EventEmitter` instance.
 * @param {(String|Symbol)} event The event name.
 * @param {Function} fn The listener function.
 * @param {*} context The context to invoke the listener with.
 * @param {Boolean} once Specify if the listener is a one-time listener.
 * @returns {EventEmitter}
 * @private
 */
function addListener(emitter, event, fn, context, once) {
  if (typeof fn !== 'function') {
    throw new TypeError('The listener must be a function');
  }

  var listener = new EE(fn, context || emitter, once)
    , evt = prefix ? prefix + event : event;

  if (!emitter._events[evt]) emitter._events[evt] = listener, emitter._eventsCount++;
  else if (!emitter._events[evt].fn) emitter._events[evt].push(listener);
  else emitter._events[evt] = [emitter._events[evt], listener];

  return emitter;
}

/**
 * Clear event by name.
 *
 * @param {EventEmitter} emitter Reference to the `EventEmitter` instance.
 * @param {(String|Symbol)} evt The Event name.
 * @private
 */
function clearEvent(emitter, evt) {
  if (--emitter._eventsCount === 0) emitter._events = new Events();
  else delete emitter._events[evt];
}

/**
 * Minimal `EventEmitter` interface that is molded against the Node.js
 * `EventEmitter` interface.
 *
 * @constructor
 * @public
 */
function EventEmitter() {
  this._events = new Events();
  this._eventsCount = 0;
}

/**
 * Return an array listing the events for which the emitter has registered
 * listeners.
 *
 * @returns {Array}
 * @public
 */
EventEmitter.prototype.eventNames = function eventNames() {
  var names = []
    , events
    , name;

  if (this._eventsCount === 0) return names;

  for (name in (events = this._events)) {
    if (has.call(events, name)) names.push(prefix ? name.slice(1) : name);
  }

  if (Object.getOwnPropertySymbols) {
    return names.concat(Object.getOwnPropertySymbols(events));
  }

  return names;
};

/**
 * Return the listeners registered for a given event.
 *
 * @param {(String|Symbol)} event The event name.
 * @returns {Array} The registered listeners.
 * @public
 */
EventEmitter.prototype.listeners = function listeners(event) {
  var evt = prefix ? prefix + event : event
    , handlers = this._events[evt];

  if (!handlers) return [];
  if (handlers.fn) return [handlers.fn];

  for (var i = 0, l = handlers.length, ee = new Array(l); i < l; i++) {
    ee[i] = handlers[i].fn;
  }

  return ee;
};

/**
 * Return the number of listeners listening to a given event.
 *
 * @param {(String|Symbol)} event The event name.
 * @returns {Number} The number of listeners.
 * @public
 */
EventEmitter.prototype.listenerCount = function listenerCount(event) {
  var evt = prefix ? prefix + event : event
    , listeners = this._events[evt];

  if (!listeners) return 0;
  if (listeners.fn) return 1;
  return listeners.length;
};

/**
 * Calls each of the listeners registered for a given event.
 *
 * @param {(String|Symbol)} event The event name.
 * @returns {Boolean} `true` if the event had listeners, else `false`.
 * @public
 */
EventEmitter.prototype.emit = function emit(event, a1, a2, a3, a4, a5) {
  var evt = prefix ? prefix + event : event;

  if (!this._events[evt]) return false;

  var listeners = this._events[evt]
    , len = arguments.length
    , args
    , i;

  if (listeners.fn) {
    if (listeners.once) this.removeListener(event, listeners.fn, undefined, true);

    switch (len) {
      case 1: return listeners.fn.call(listeners.context), true;
      case 2: return listeners.fn.call(listeners.context, a1), true;
      case 3: return listeners.fn.call(listeners.context, a1, a2), true;
      case 4: return listeners.fn.call(listeners.context, a1, a2, a3), true;
      case 5: return listeners.fn.call(listeners.context, a1, a2, a3, a4), true;
      case 6: return listeners.fn.call(listeners.context, a1, a2, a3, a4, a5), true;
    }

    for (i = 1, args = new Array(len -1); i < len; i++) {
      args[i - 1] = arguments[i];
    }

    listeners.fn.apply(listeners.context, args);
  } else {
    var length = listeners.length
      , j;

    for (i = 0; i < length; i++) {
      if (listeners[i].once) this.removeListener(event, listeners[i].fn, undefined, true);

      switch (len) {
        case 1: listeners[i].fn.call(listeners[i].context); break;
        case 2: listeners[i].fn.call(listeners[i].context, a1); break;
        case 3: listeners[i].fn.call(listeners[i].context, a1, a2); break;
        case 4: listeners[i].fn.call(listeners[i].context, a1, a2, a3); break;
        default:
          if (!args) for (j = 1, args = new Array(len -1); j < len; j++) {
            args[j - 1] = arguments[j];
          }

          listeners[i].fn.apply(listeners[i].context, args);
      }
    }
  }

  return true;
};

/**
 * Add a listener for a given event.
 *
 * @param {(String|Symbol)} event The event name.
 * @param {Function} fn The listener function.
 * @param {*} [context=this] The context to invoke the listener with.
 * @returns {EventEmitter} `this`.
 * @public
 */
EventEmitter.prototype.on = function on(event, fn, context) {
  return addListener(this, event, fn, context, false);
};

/**
 * Add a one-time listener for a given event.
 *
 * @param {(String|Symbol)} event The event name.
 * @param {Function} fn The listener function.
 * @param {*} [context=this] The context to invoke the listener with.
 * @returns {EventEmitter} `this`.
 * @public
 */
EventEmitter.prototype.once = function once(event, fn, context) {
  return addListener(this, event, fn, context, true);
};

/**
 * Remove the listeners of a given event.
 *
 * @param {(String|Symbol)} event The event name.
 * @param {Function} fn Only remove the listeners that match this function.
 * @param {*} context Only remove the listeners that have this context.
 * @param {Boolean} once Only remove one-time listeners.
 * @returns {EventEmitter} `this`.
 * @public
 */
EventEmitter.prototype.removeListener = function removeListener(event, fn, context, once) {
  var evt = prefix ? prefix + event : event;

  if (!this._events[evt]) return this;
  if (!fn) {
    clearEvent(this, evt);
    return this;
  }

  var listeners = this._events[evt];

  if (listeners.fn) {
    if (
      listeners.fn === fn &&
      (!once || listeners.once) &&
      (!context || listeners.context === context)
    ) {
      clearEvent(this, evt);
    }
  } else {
    for (var i = 0, events = [], length = listeners.length; i < length; i++) {
      if (
        listeners[i].fn !== fn ||
        (once && !listeners[i].once) ||
        (context && listeners[i].context !== context)
      ) {
        events.push(listeners[i]);
      }
    }

    //
    // Reset the array, or remove it completely if we have no more listeners.
    //
    if (events.length) this._events[evt] = events.length === 1 ? events[0] : events;
    else clearEvent(this, evt);
  }

  return this;
};

/**
 * Remove all listeners, or those of the specified event.
 *
 * @param {(String|Symbol)} [event] The event name.
 * @returns {EventEmitter} `this`.
 * @public
 */
EventEmitter.prototype.removeAllListeners = function removeAllListeners(event) {
  var evt;

  if (event) {
    evt = prefix ? prefix + event : event;
    if (this._events[evt]) clearEvent(this, evt);
  } else {
    this._events = new Events();
    this._eventsCount = 0;
  }

  return this;
};

//
// Alias methods names because people roll like that.
//
EventEmitter.prototype.off = EventEmitter.prototype.removeListener;
EventEmitter.prototype.addListener = EventEmitter.prototype.on;

//
// Expose the prefix.
//
EventEmitter.prefixed = prefix;

//
// Allow `EventEmitter` to be imported as module namespace.
//
EventEmitter.EventEmitter = EventEmitter;

//
// Expose the module.
//
if ('undefined' !== typeof module) {
  module.exports = EventEmitter;
}

},{}],4:[function(_dereq_,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
    }
  }
}

},{}],5:[function(_dereq_,module,exports){
'use strict';

var regex = new RegExp('^((?:\\d+)?\\.?\\d+) *('+ [
  'milliseconds?',
  'msecs?',
  'ms',
  'seconds?',
  'secs?',
  's',
  'minutes?',
  'mins?',
  'm',
  'hours?',
  'hrs?',
  'h',
  'days?',
  'd',
  'weeks?',
  'wks?',
  'w',
  'years?',
  'yrs?',
  'y'
].join('|') +')?$', 'i');

var second = 1000
  , minute = second * 60
  , hour = minute * 60
  , day = hour * 24
  , week = day * 7
  , year = day * 365;

/**
 * Parse a time string and return the number value of it.
 *
 * @param {String} ms Time string.
 * @returns {Number}
 * @api private
 */
module.exports = function millisecond(ms) {
  var type = typeof ms
    , amount
    , match;

  if ('number' === type) return ms;
  else if ('string' !== type || '0' === ms || !ms) return 0;
  else if (+ms) return +ms;

  //
  // We are vulnerable to the regular expression denial of service (ReDoS).
  // In order to mitigate this we don't parse the input string if it is too long.
  // See https://nodesecurity.io/advisories/46.
  //
  if (ms.length > 10000 || !(match = regex.exec(ms))) return 0;

  amount = parseFloat(match[1]);

  switch (match[2].toLowerCase()) {
    case 'years':
    case 'year':
    case 'yrs':
    case 'yr':
    case 'y':
      return amount * year;

    case 'weeks':
    case 'week':
    case 'wks':
    case 'wk':
    case 'w':
      return amount * week;

    case 'days':
    case 'day':
    case 'd':
      return amount * day;

    case 'hours':
    case 'hour':
    case 'hrs':
    case 'hr':
    case 'h':
      return amount * hour;

    case 'minutes':
    case 'minute':
    case 'mins':
    case 'min':
    case 'm':
      return amount * minute;

    case 'seconds':
    case 'second':
    case 'secs':
    case 'sec':
    case 's':
      return amount * second;

    default:
      return amount;
  }
};

},{}],6:[function(_dereq_,module,exports){
'use strict';

/**
 * Wrap callbacks to prevent double execution.
 *
 * @param {Function} fn Function that should only be called once.
 * @returns {Function} A wrapped callback which prevents execution.
 * @api public
 */
module.exports = function one(fn) {
  var called = 0
    , value;

  /**
   * The function that prevents double execution.
   *
   * @api private
   */
  function onetime() {
    if (called) return value;

    called = 1;
    value = fn.apply(this, arguments);
    fn = null;

    return value;
  }

  //
  // To make debugging more easy we want to use the name of the supplied
  // function. So when you look at the functions that are assigned to event
  // listeners you don't see a load of `onetime` functions but actually the
  // names of the functions that this module will call.
  //
  onetime.displayName = fn.displayName || fn.name || onetime.displayName || onetime.name;
  return onetime;
};

},{}],7:[function(_dereq_,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; };

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

var has = Object.prototype.hasOwnProperty
  , undef;

/**
 * Decode a URI encoded string.
 *
 * @param {String} input The URI encoded string.
 * @returns {String|Null} The decoded string.
 * @api private
 */
function decode(input) {
  try {
    return decodeURIComponent(input.replace(/\+/g, ' '));
  } catch (e) {
    return null;
  }
}

/**
 * Attempts to encode a given input.
 *
 * @param {String} input The string that needs to be encoded.
 * @returns {String|Null} The encoded string.
 * @api private
 */
function encode(input) {
  try {
    return encodeURIComponent(input);
  } catch (e) {
    return null;
  }
}

/**
 * Simple query string parser.
 *
 * @param {String} query The query string that needs to be parsed.
 * @returns {Object}
 * @api public
 */
function querystring(query) {
  var parser = /([^=?#&]+)=?([^&]*)/g
    , result = {}
    , part;

  while (part = parser.exec(query)) {
    var key = decode(part[1])
      , value = decode(part[2]);

    //
    // Prevent overriding of existing properties. This ensures that build-in
    // methods like `toString` or __proto__ are not overriden by malicious
    // querystrings.
    //
    // In the case if failed decoding, we want to omit the key/value pairs
    // from the result.
    //
    if (key === null || value === null || key in result) continue;
    result[key] = value;
  }

  return result;
}

/**
 * Transform a query string to an object.
 *
 * @param {Object} obj Object that should be transformed.
 * @param {String} prefix Optional prefix.
 * @returns {String}
 * @api public
 */
function querystringify(obj, prefix) {
  prefix = prefix || '';

  var pairs = []
    , value
    , key;

  //
  // Optionally prefix with a '?' if needed
  //
  if ('string' !== typeof prefix) prefix = '?';

  for (key in obj) {
    if (has.call(obj, key)) {
      value = obj[key];

      //
      // Edge cases where we actually want to encode the value to an empty
      // string instead of the stringified value.
      //
      if (!value && (value === null || value === undef || isNaN(value))) {
        value = '';
      }

      key = encode(key);
      value = encode(value);

      //
      // If we failed to encode the strings, we should bail out as we don't
      // want to add invalid strings to the query.
      //
      if (key === null || value === null) continue;
      pairs.push(key +'='+ value);
    }
  }

  return pairs.length ? prefix + pairs.join('&') : '';
}

//
// Expose the module.
//
exports.stringify = querystringify;
exports.parse = querystring;

},{}],9:[function(_dereq_,module,exports){
'use strict';

var EventEmitter = _dereq_('eventemitter3')
  , millisecond = _dereq_('millisecond')
  , destroy = _dereq_('demolish')
  , Tick = _dereq_('tick-tock')
  , one = _dereq_('one-time');

/**
 * Returns sane defaults about a given value.
 *
 * @param {String} name Name of property we want.
 * @param {Recovery} selfie Recovery instance that got created.
 * @param {Object} opts User supplied options we want to check.
 * @returns {Number} Some default value.
 * @api private
 */
function defaults(name, selfie, opts) {
  return millisecond(
    name in opts ? opts[name] : (name in selfie ? selfie[name] : Recovery[name])
  );
}

/**
 * Attempt to recover your connection with reconnection attempt.
 *
 * @constructor
 * @param {Object} options Configuration
 * @api public
 */
function Recovery(options) {
  var recovery = this;

  if (!(recovery instanceof Recovery)) return new Recovery(options);

  options = options || {};

  recovery.attempt = null;        // Stores the current reconnect attempt.
  recovery._fn = null;            // Stores the callback.

  recovery['reconnect timeout'] = defaults('reconnect timeout', recovery, options);
  recovery.retries = defaults('retries', recovery, options);
  recovery.factor = defaults('factor', recovery, options);
  recovery.max = defaults('max', recovery, options);
  recovery.min = defaults('min', recovery, options);
  recovery.timers = new Tick(recovery);
}

Recovery.prototype = new EventEmitter();
Recovery.prototype.constructor = Recovery;

Recovery['reconnect timeout'] = '30 seconds';  // Maximum time to wait for an answer.
Recovery.max = Infinity;                       // Maximum delay.
Recovery.min = '500 ms';                       // Minimum delay.
Recovery.retries = 10;                         // Maximum amount of retries.
Recovery.factor = 2;                           // Exponential back off factor.

/**
 * Start a new reconnect procedure.
 *
 * @returns {Recovery}
 * @api public
 */
Recovery.prototype.reconnect = function reconnect() {
  var recovery = this;

  return recovery.backoff(function backedoff(err, opts) {
    opts.duration = (+new Date()) - opts.start;

    if (err) return recovery.emit('reconnect failed', err, opts);

    recovery.emit('reconnected', opts);
  }, recovery.attempt);
};

/**
 * Exponential back off algorithm for retry operations. It uses a randomized
 * retry so we don't DDOS our server when it goes down under pressure.
 *
 * @param {Function} fn Callback to be called after the timeout.
 * @param {Object} opts Options for configuring the timeout.
 * @returns {Recovery}
 * @api private
 */
Recovery.prototype.backoff = function backoff(fn, opts) {
  var recovery = this;

  opts = opts || recovery.attempt || {};

  //
  // Bailout when we already have a back off process running. We shouldn't call
  // the callback then.
  //
  if (opts.backoff) return recovery;

  opts['reconnect timeout'] = defaults('reconnect timeout', recovery, opts);
  opts.retries = defaults('retries', recovery, opts);
  opts.factor = defaults('factor', recovery, opts);
  opts.max = defaults('max', recovery, opts);
  opts.min = defaults('min', recovery, opts);

  opts.start = +opts.start || +new Date();
  opts.duration = +opts.duration || 0;
  opts.attempt = +opts.attempt || 0;

  //
  // Bailout if we are about to make too much attempts.
  //
  if (opts.attempt === opts.retries) {
    fn.call(recovery, new Error('Unable to recover'), opts);
    return recovery;
  }

  //
  // Prevent duplicate back off attempts using the same options object and
  // increment our attempt as we're about to have another go at this thing.
  //
  opts.backoff = true;
  opts.attempt++;

  recovery.attempt = opts;

  //
  // Calculate the timeout, but make it randomly so we don't retry connections
  // at the same interval and defeat the purpose. This exponential back off is
  // based on the work of:
  //
  // http://dthain.blogspot.nl/2009/02/exponential-backoff-in-distributed.html
  //
  opts.scheduled = opts.attempt !== 1
    ? Math.min(Math.round(
        (Math.random() + 1) * opts.min * Math.pow(opts.factor, opts.attempt - 1)
      ), opts.max)
    : opts.min;

  recovery.timers.setTimeout('reconnect', function delay() {
    opts.duration = (+new Date()) - opts.start;
    opts.backoff = false;
    recovery.timers.clear('reconnect, timeout');

    //
    // Create a `one` function which can only be called once. So we can use the
    // same function for different types of invocations to create a much better
    // and usable API.
    //
    var connect = recovery._fn = one(function connect(err) {
      recovery.reset();

      if (err) return recovery.backoff(fn, opts);

      fn.call(recovery, undefined, opts);
    });

    recovery.emit('reconnect', opts, connect);
    recovery.timers.setTimeout('timeout', function timeout() {
      var err = new Error('Failed to reconnect in a timely manner');
      opts.duration = (+new Date()) - opts.start;

      recovery.emit('reconnect timeout', err, opts);
      connect(err);
    }, opts['reconnect timeout']);
  }, opts.scheduled);

  //
  // Emit a `reconnecting` event with current reconnect options. This allows
  // them to update the UI and provide their users with feedback.
  //
  recovery.emit('reconnect scheduled', opts);

  return recovery;
};

/**
 * Check if the reconnection process is currently reconnecting.
 *
 * @returns {Boolean}
 * @api public
 */
Recovery.prototype.reconnecting = function reconnecting() {
  return !!this.attempt;
};

/**
 * Tell our reconnection procedure that we're passed.
 *
 * @param {Error} err Reconnection failed.
 * @returns {Recovery}
 * @api public
 */
Recovery.prototype.reconnected = function reconnected(err) {
  if (this._fn) this._fn(err);
  return this;
};

/**
 * Reset the reconnection attempt so it can be re-used again.
 *
 * @returns {Recovery}
 * @api public
 */
Recovery.prototype.reset = function reset() {
  this._fn = this.attempt = null;
  this.timers.clear('reconnect, timeout');

  return this;
};

/**
 * Clean up the instance.
 *
 * @type {Function}
 * @returns {Boolean}
 * @api public
 */
Recovery.prototype.destroy = destroy('timers attempt _fn');

//
// Expose the module.
//
module.exports = Recovery;

},{"demolish":1,"eventemitter3":10,"millisecond":5,"one-time":6,"tick-tock":12}],10:[function(_dereq_,module,exports){
'use strict';

//
// We store our EE objects in a plain object whose properties are event names.
// If `Object.create(null)` is not supported we prefix the event names with a
// `~` to make sure that the built-in object properties are not overridden or
// used as an attack vector.
// We also assume that `Object.create(null)` is available when the event name
// is an ES6 Symbol.
//
var prefix = typeof Object.create !== 'function' ? '~' : false;

/**
 * Representation of a single EventEmitter function.
 *
 * @param {Function} fn Event handler to be called.
 * @param {Mixed} context Context for function execution.
 * @param {Boolean} once Only emit once
 * @api private
 */
function EE(fn, context, once) {
  this.fn = fn;
  this.context = context;
  this.once = once || false;
}

/**
 * Minimal EventEmitter interface that is molded against the Node.js
 * EventEmitter interface.
 *
 * @constructor
 * @api public
 */
function EventEmitter() { /* Nothing to set */ }

/**
 * Holds the assigned EventEmitters by name.
 *
 * @type {Object}
 * @private
 */
EventEmitter.prototype._events = undefined;

/**
 * Return a list of assigned event listeners.
 *
 * @param {String} event The events that should be listed.
 * @param {Boolean} exists We only need to know if there are listeners.
 * @returns {Array|Boolean}
 * @api public
 */
EventEmitter.prototype.listeners = function listeners(event, exists) {
  var evt = prefix ? prefix + event : event
    , available = this._events && this._events[evt];

  if (exists) return !!available;
  if (!available) return [];
  if (available.fn) return [available.fn];

  for (var i = 0, l = available.length, ee = new Array(l); i < l; i++) {
    ee[i] = available[i].fn;
  }

  return ee;
};

/**
 * Emit an event to all registered event listeners.
 *
 * @param {String} event The name of the event.
 * @returns {Boolean} Indication if we've emitted an event.
 * @api public
 */
EventEmitter.prototype.emit = function emit(event, a1, a2, a3, a4, a5) {
  var evt = prefix ? prefix + event : event;

  if (!this._events || !this._events[evt]) return false;

  var listeners = this._events[evt]
    , len = arguments.length
    , args
    , i;

  if ('function' === typeof listeners.fn) {
    if (listeners.once) this.removeListener(event, listeners.fn, undefined, true);

    switch (len) {
      case 1: return listeners.fn.call(listeners.context), true;
      case 2: return listeners.fn.call(listeners.context, a1), true;
      case 3: return listeners.fn.call(listeners.context, a1, a2), true;
      case 4: return listeners.fn.call(listeners.context, a1, a2, a3), true;
      case 5: return listeners.fn.call(listeners.context, a1, a2, a3, a4), true;
      case 6: return listeners.fn.call(listeners.context, a1, a2, a3, a4, a5), true;
    }

    for (i = 1, args = new Array(len -1); i < len; i++) {
      args[i - 1] = arguments[i];
    }

    listeners.fn.apply(listeners.context, args);
  } else {
    var length = listeners.length
      , j;

    for (i = 0; i < length; i++) {
      if (listeners[i].once) this.removeListener(event, listeners[i].fn, undefined, true);

      switch (len) {
        case 1: listeners[i].fn.call(listeners[i].context); break;
        case 2: listeners[i].fn.call(listeners[i].context, a1); break;
        case 3: listeners[i].fn.call(listeners[i].context, a1, a2); break;
        default:
          if (!args) for (j = 1, args = new Array(len -1); j < len; j++) {
            args[j - 1] = arguments[j];
          }

          listeners[i].fn.apply(listeners[i].context, args);
      }
    }
  }

  return true;
};

/**
 * Register a new EventListener for the given event.
 *
 * @param {String} event Name of the event.
 * @param {Functon} fn Callback function.
 * @param {Mixed} context The context of the function.
 * @api public
 */
EventEmitter.prototype.on = function on(event, fn, context) {
  var listener = new EE(fn, context || this)
    , evt = prefix ? prefix + event : event;

  if (!this._events) this._events = prefix ? {} : Object.create(null);
  if (!this._events[evt]) this._events[evt] = listener;
  else {
    if (!this._events[evt].fn) this._events[evt].push(listener);
    else this._events[evt] = [
      this._events[evt], listener
    ];
  }

  return this;
};

/**
 * Add an EventListener that's only called once.
 *
 * @param {String} event Name of the event.
 * @param {Function} fn Callback function.
 * @param {Mixed} context The context of the function.
 * @api public
 */
EventEmitter.prototype.once = function once(event, fn, context) {
  var listener = new EE(fn, context || this, true)
    , evt = prefix ? prefix + event : event;

  if (!this._events) this._events = prefix ? {} : Object.create(null);
  if (!this._events[evt]) this._events[evt] = listener;
  else {
    if (!this._events[evt].fn) this._events[evt].push(listener);
    else this._events[evt] = [
      this._events[evt], listener
    ];
  }

  return this;
};

/**
 * Remove event listeners.
 *
 * @param {String} event The event we want to remove.
 * @param {Function} fn The listener that we need to find.
 * @param {Mixed} context Only remove listeners matching this context.
 * @param {Boolean} once Only remove once listeners.
 * @api public
 */
EventEmitter.prototype.removeListener = function removeListener(event, fn, context, once) {
  var evt = prefix ? prefix + event : event;

  if (!this._events || !this._events[evt]) return this;

  var listeners = this._events[evt]
    , events = [];

  if (fn) {
    if (listeners.fn) {
      if (
           listeners.fn !== fn
        || (once && !listeners.once)
        || (context && listeners.context !== context)
      ) {
        events.push(listeners);
      }
    } else {
      for (var i = 0, length = listeners.length; i < length; i++) {
        if (
             listeners[i].fn !== fn
          || (once && !listeners[i].once)
          || (context && listeners[i].context !== context)
        ) {
          events.push(listeners[i]);
        }
      }
    }
  }

  //
  // Reset the array, or remove it completely if we have no more listeners.
  //
  if (events.length) {
    this._events[evt] = events.length === 1 ? events[0] : events;
  } else {
    delete this._events[evt];
  }

  return this;
};

/**
 * Remove all listeners or only the listeners for the specified event.
 *
 * @param {String} event The event want to remove all listeners for.
 * @api public
 */
EventEmitter.prototype.removeAllListeners = function removeAllListeners(event) {
  if (!this._events) return this;

  if (event) delete this._events[prefix ? prefix + event : event];
  else this._events = prefix ? {} : Object.create(null);

  return this;
};

//
// Alias methods names because people roll like that.
//
EventEmitter.prototype.off = EventEmitter.prototype.removeListener;
EventEmitter.prototype.addListener = EventEmitter.prototype.on;

//
// This function doesn't apply anymore.
//
EventEmitter.prototype.setMaxListeners = function setMaxListeners() {
  return this;
};

//
// Expose the prefix.
//
EventEmitter.prefixed = prefix;

//
// Expose the module.
//
if ('undefined' !== typeof module) {
  module.exports = EventEmitter;
}

},{}],11:[function(_dereq_,module,exports){
'use strict';

/**
 * Check if we're required to add a port number.
 *
 * @see https://url.spec.whatwg.org/#default-port
 * @param {Number|String} port Port number we need to check
 * @param {String} protocol Protocol we need to check against.
 * @returns {Boolean} Is it a default port for the given protocol
 * @api private
 */
module.exports = function required(port, protocol) {
  protocol = protocol.split(':')[0];
  port = +port;

  if (!port) return false;

  switch (protocol) {
    case 'http':
    case 'ws':
    return port !== 80;

    case 'https':
    case 'wss':
    return port !== 443;

    case 'ftp':
    return port !== 21;

    case 'gopher':
    return port !== 70;

    case 'file':
    return false;
  }

  return port !== 0;
};

},{}],12:[function(_dereq_,module,exports){
(function (setImmediate,clearImmediate){(function (){
'use strict';

var has = Object.prototype.hasOwnProperty
  , ms = _dereq_('millisecond');

/**
 * Timer instance.
 *
 * @constructor
 * @param {Object} timer New timer instance.
 * @param {Function} clear Clears the timer instance.
 * @param {Function} duration Duration of the timer.
 * @param {Function} fn The functions that need to be executed.
 * @api private
 */
function Timer(timer, clear, duration, fn) {
  this.start = +(new Date());
  this.duration = duration;
  this.clear = clear;
  this.timer = timer;
  this.fns = [fn];
}

/**
 * Calculate the time left for a given timer.
 *
 * @returns {Number} Time in milliseconds.
 * @api public
 */
Timer.prototype.remaining = function remaining() {
  return this.duration - this.taken();
};

/**
 * Calculate the amount of time it has taken since we've set the timer.
 *
 * @returns {Number}
 * @api public
 */
Timer.prototype.taken = function taken() {
  return +(new Date()) - this.start;
};

/**
 * Custom wrappers for the various of clear{whatever} functions. We cannot
 * invoke them directly as this will cause thrown errors in Google Chrome with
 * an Illegal Invocation Error
 *
 * @see #2
 * @type {Function}
 * @api private
 */
function unsetTimeout(id) { clearTimeout(id); }
function unsetInterval(id) { clearInterval(id); }
function unsetImmediate(id) { clearImmediate(id); }

/**
 * Simple timer management.
 *
 * @constructor
 * @param {Mixed} context Context of the callbacks that we execute.
 * @api public
 */
function Tick(context) {
  if (!(this instanceof Tick)) return new Tick(context);

  this.timers = {};
  this.context = context || this;
}

/**
 * Return a function which will just iterate over all assigned callbacks and
 * optionally clear the timers from memory if needed.
 *
 * @param {String} name Name of the timer we need to execute.
 * @param {Boolean} clear Also clear from memory.
 * @returns {Function}
 * @api private
 */
Tick.prototype.tock = function ticktock(name, clear) {
  var tock = this;

  return function tickedtock() {
    if (!(name in tock.timers)) return;

    var timer = tock.timers[name]
      , fns = timer.fns.slice()
      , l = fns.length
      , i = 0;

    if (clear) tock.clear(name);
    else tock.start = +new Date();

    for (; i < l; i++) {
      fns[i].call(tock.context);
    }
  };
};

/**
 * Add a new timeout.
 *
 * @param {String} name Name of the timer.
 * @param {Function} fn Completion callback.
 * @param {Mixed} time Duration of the timer.
 * @returns {Tick}
 * @api public
 */
Tick.prototype.setTimeout = function timeout(name, fn, time) {
  var tick = this
    , tock;

  if (tick.timers[name]) {
    tick.timers[name].fns.push(fn);
    return tick;
  }

  tock = ms(time);
  tick.timers[name] = new Timer(
    setTimeout(tick.tock(name, true), ms(time)),
    unsetTimeout,
    tock,
    fn
  );

  return tick;
};

/**
 * Add a new interval.
 *
 * @param {String} name Name of the timer.
 * @param {Function} fn Completion callback.
 * @param {Mixed} time Interval of the timer.
 * @returns {Tick}
 * @api public
 */
Tick.prototype.setInterval = function interval(name, fn, time) {
  var tick = this
    , tock;

  if (tick.timers[name]) {
    tick.timers[name].fns.push(fn);
    return tick;
  }

  tock = ms(time);
  tick.timers[name] = new Timer(
    setInterval(tick.tock(name), ms(time)),
    unsetInterval,
    tock,
    fn
  );

  return tick;
};

/**
 * Add a new setImmediate.
 *
 * @param {String} name Name of the timer.
 * @param {Function} fn Completion callback.
 * @returns {Tick}
 * @api public
 */
Tick.prototype.setImmediate = function immediate(name, fn) {
  var tick = this;

  if ('function' !== typeof setImmediate) return tick.setTimeout(name, fn, 0);

  if (tick.timers[name]) {
    tick.timers[name].fns.push(fn);
    return tick;
  }

  tick.timers[name] = new Timer(
    setImmediate(tick.tock(name, true)),
    unsetImmediate,
    0,
    fn
  );

  return tick;
};

/**
 * Check if we have a timer set.
 *
 * @param {String} name
 * @returns {Boolean}
 * @api public
 */
Tick.prototype.active = function active(name) {
  return name in this.timers;
};

/**
 * Properly clean up all timeout references. If no arguments are supplied we
 * will attempt to clear every single timer that is present.
 *
 * @param {Arguments} ..args.. The names of the timeouts we need to clear
 * @returns {Tick}
 * @api public
 */
Tick.prototype.clear = function clear() {
  var args = arguments.length ? arguments : []
    , tick = this
    , timer, i, l;

  if (args.length === 1 && 'string' === typeof args[0]) {
    args = args[0].split(/[, ]+/);
  }

  if (!args.length) {
    for (timer in tick.timers) {
      if (has.call(tick.timers, timer)) args.push(timer);
    }
  }

  for (i = 0, l = args.length; i < l; i++) {
    timer = tick.timers[args[i]];

    if (!timer) continue;
    timer.clear(timer.timer);

    timer.fns = timer.timer = timer.clear = null;
    delete tick.timers[args[i]];
  }

  return tick;
};

/**
 * Adjust a timeout or interval to a new duration.
 *
 * @returns {Tick}
 * @api public
 */
Tick.prototype.adjust = function adjust(name, time) {
  var interval
    , tick = this
    , tock = ms(time)
    , timer = tick.timers[name];

  if (!timer) return tick;

  interval = timer.clear === unsetInterval;
  timer.clear(timer.timer);
  timer.start = +(new Date());
  timer.duration = tock;
  timer.timer = (interval ? setInterval : setTimeout)(tick.tock(name, !interval), tock);

  return tick;
};

/**
 * We will no longer use this module, prepare your self for global cleanups.
 *
 * @returns {Boolean}
 * @api public
 */
Tick.prototype.end = Tick.prototype.destroy = function end() {
  if (!this.context) return false;

  this.clear();
  this.context = this.timers = null;

  return true;
};

//
// Expose the timer factory.
//
Tick.Timer = Timer;
module.exports = Tick;

}).call(this)}).call(this,_dereq_("timers").setImmediate,_dereq_("timers").clearImmediate)
},{"millisecond":5,"timers":13}],13:[function(_dereq_,module,exports){
(function (setImmediate,clearImmediate){(function (){
var nextTick = _dereq_('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,_dereq_("timers").setImmediate,_dereq_("timers").clearImmediate)
},{"process/browser.js":7,"timers":13}],14:[function(_dereq_,module,exports){
(function (global){(function (){
'use strict';

var required = _dereq_('requires-port')
  , qs = _dereq_('querystringify')
  , controlOrWhitespace = /^[\x00-\x20\u00a0\u1680\u2000-\u200a\u2028\u2029\u202f\u205f\u3000\ufeff]+/
  , CRHTLF = /[\n\r\t]/g
  , slashes = /^[A-Za-z][A-Za-z0-9+-.]*:\/\//
  , port = /:\d+$/
  , protocolre = /^([a-z][a-z0-9.+-]*:)?(\/\/)?([\\/]+)?([\S\s]*)/i
  , windowsDriveLetter = /^[a-zA-Z]:/;

/**
 * Remove control characters and whitespace from the beginning of a string.
 *
 * @param {Object|String} str String to trim.
 * @returns {String} A new string representing `str` stripped of control
 *     characters and whitespace from its beginning.
 * @public
 */
function trimLeft(str) {
  return (str ? str : '').toString().replace(controlOrWhitespace, '');
}

/**
 * These are the parse rules for the URL parser, it informs the parser
 * about:
 *
 * 0. The char it Needs to parse, if it's a string it should be done using
 *    indexOf, RegExp using exec and NaN means set as current value.
 * 1. The property we should set when parsing this value.
 * 2. Indication if it's backwards or forward parsing, when set as number it's
 *    the value of extra chars that should be split off.
 * 3. Inherit from location if non existing in the parser.
 * 4. `toLowerCase` the resulting value.
 */
var rules = [
  ['#', 'hash'],                        // Extract from the back.
  ['?', 'query'],                       // Extract from the back.
  function sanitize(address, url) {     // Sanitize what is left of the address
    return isSpecial(url.protocol) ? address.replace(/\\/g, '/') : address;
  },
  ['/', 'pathname'],                    // Extract from the back.
  ['@', 'auth', 1],                     // Extract from the front.
  [NaN, 'host', undefined, 1, 1],       // Set left over value.
  [/:(\d*)$/, 'port', undefined, 1],    // RegExp the back.
  [NaN, 'hostname', undefined, 1, 1]    // Set left over.
];

/**
 * These properties should not be copied or inherited from. This is only needed
 * for all non blob URL's as a blob URL does not include a hash, only the
 * origin.
 *
 * @type {Object}
 * @private
 */
var ignore = { hash: 1, query: 1 };

/**
 * The location object differs when your code is loaded through a normal page,
 * Worker or through a worker using a blob. And with the blobble begins the
 * trouble as the location object will contain the URL of the blob, not the
 * location of the page where our code is loaded in. The actual origin is
 * encoded in the `pathname` so we can thankfully generate a good "default"
 * location from it so we can generate proper relative URL's again.
 *
 * @param {Object|String} loc Optional default location object.
 * @returns {Object} lolcation object.
 * @public
 */
function lolcation(loc) {
  var globalVar;

  if (typeof window !== 'undefined') globalVar = window;
  else if (typeof global !== 'undefined') globalVar = global;
  else if (typeof self !== 'undefined') globalVar = self;
  else globalVar = {};

  var location = globalVar.location || {};
  loc = loc || location;

  var finaldestination = {}
    , type = typeof loc
    , key;

  if ('blob:' === loc.protocol) {
    finaldestination = new Url(unescape(loc.pathname), {});
  } else if ('string' === type) {
    finaldestination = new Url(loc, {});
    for (key in ignore) delete finaldestination[key];
  } else if ('object' === type) {
    for (key in loc) {
      if (key in ignore) continue;
      finaldestination[key] = loc[key];
    }

    if (finaldestination.slashes === undefined) {
      finaldestination.slashes = slashes.test(loc.href);
    }
  }

  return finaldestination;
}

/**
 * Check whether a protocol scheme is special.
 *
 * @param {String} The protocol scheme of the URL
 * @return {Boolean} `true` if the protocol scheme is special, else `false`
 * @private
 */
function isSpecial(scheme) {
  return (
    scheme === 'file:' ||
    scheme === 'ftp:' ||
    scheme === 'http:' ||
    scheme === 'https:' ||
    scheme === 'ws:' ||
    scheme === 'wss:'
  );
}

/**
 * @typedef ProtocolExtract
 * @type Object
 * @property {String} protocol Protocol matched in the URL, in lowercase.
 * @property {Boolean} slashes `true` if protocol is followed by "//", else `false`.
 * @property {String} rest Rest of the URL that is not part of the protocol.
 */

/**
 * Extract protocol information from a URL with/without double slash ("//").
 *
 * @param {String} address URL we want to extract from.
 * @param {Object} location
 * @return {ProtocolExtract} Extracted information.
 * @private
 */
function extractProtocol(address, location) {
  address = trimLeft(address);
  address = address.replace(CRHTLF, '');
  location = location || {};

  var match = protocolre.exec(address);
  var protocol = match[1] ? match[1].toLowerCase() : '';
  var forwardSlashes = !!match[2];
  var otherSlashes = !!match[3];
  var slashesCount = 0;
  var rest;

  if (forwardSlashes) {
    if (otherSlashes) {
      rest = match[2] + match[3] + match[4];
      slashesCount = match[2].length + match[3].length;
    } else {
      rest = match[2] + match[4];
      slashesCount = match[2].length;
    }
  } else {
    if (otherSlashes) {
      rest = match[3] + match[4];
      slashesCount = match[3].length;
    } else {
      rest = match[4]
    }
  }

  if (protocol === 'file:') {
    if (slashesCount >= 2) {
      rest = rest.slice(2);
    }
  } else if (isSpecial(protocol)) {
    rest = match[4];
  } else if (protocol) {
    if (forwardSlashes) {
      rest = rest.slice(2);
    }
  } else if (slashesCount >= 2 && isSpecial(location.protocol)) {
    rest = match[4];
  }

  return {
    protocol: protocol,
    slashes: forwardSlashes || isSpecial(protocol),
    slashesCount: slashesCount,
    rest: rest
  };
}

/**
 * Resolve a relative URL pathname against a base URL pathname.
 *
 * @param {String} relative Pathname of the relative URL.
 * @param {String} base Pathname of the base URL.
 * @return {String} Resolved pathname.
 * @private
 */
function resolve(relative, base) {
  if (relative === '') return base;

  var path = (base || '/').split('/').slice(0, -1).concat(relative.split('/'))
    , i = path.length
    , last = path[i - 1]
    , unshift = false
    , up = 0;

  while (i--) {
    if (path[i] === '.') {
      path.splice(i, 1);
    } else if (path[i] === '..') {
      path.splice(i, 1);
      up++;
    } else if (up) {
      if (i === 0) unshift = true;
      path.splice(i, 1);
      up--;
    }
  }

  if (unshift) path.unshift('');
  if (last === '.' || last === '..') path.push('');

  return path.join('/');
}

/**
 * The actual URL instance. Instead of returning an object we've opted-in to
 * create an actual constructor as it's much more memory efficient and
 * faster and it pleases my OCD.
 *
 * It is worth noting that we should not use `URL` as class name to prevent
 * clashes with the global URL instance that got introduced in browsers.
 *
 * @constructor
 * @param {String} address URL we want to parse.
 * @param {Object|String} [location] Location defaults for relative paths.
 * @param {Boolean|Function} [parser] Parser for the query string.
 * @private
 */
function Url(address, location, parser) {
  address = trimLeft(address);
  address = address.replace(CRHTLF, '');

  if (!(this instanceof Url)) {
    return new Url(address, location, parser);
  }

  var relative, extracted, parse, instruction, index, key
    , instructions = rules.slice()
    , type = typeof location
    , url = this
    , i = 0;

  //
  // The following if statements allows this module two have compatibility with
  // 2 different API:
  //
  // 1. Node.js's `url.parse` api which accepts a URL, boolean as arguments
  //    where the boolean indicates that the query string should also be parsed.
  //
  // 2. The `URL` interface of the browser which accepts a URL, object as
  //    arguments. The supplied object will be used as default values / fall-back
  //    for relative paths.
  //
  if ('object' !== type && 'string' !== type) {
    parser = location;
    location = null;
  }

  if (parser && 'function' !== typeof parser) parser = qs.parse;

  location = lolcation(location);

  //
  // Extract protocol information before running the instructions.
  //
  extracted = extractProtocol(address || '', location);
  relative = !extracted.protocol && !extracted.slashes;
  url.slashes = extracted.slashes || relative && location.slashes;
  url.protocol = extracted.protocol || location.protocol || '';
  address = extracted.rest;

  //
  // When the authority component is absent the URL starts with a path
  // component.
  //
  if (
    extracted.protocol === 'file:' && (
      extracted.slashesCount !== 2 || windowsDriveLetter.test(address)) ||
    (!extracted.slashes &&
      (extracted.protocol ||
        extracted.slashesCount < 2 ||
        !isSpecial(url.protocol)))
  ) {
    instructions[3] = [/(.*)/, 'pathname'];
  }

  for (; i < instructions.length; i++) {
    instruction = instructions[i];

    if (typeof instruction === 'function') {
      address = instruction(address, url);
      continue;
    }

    parse = instruction[0];
    key = instruction[1];

    if (parse !== parse) {
      url[key] = address;
    } else if ('string' === typeof parse) {
      index = parse === '@'
        ? address.lastIndexOf(parse)
        : address.indexOf(parse);

      if (~index) {
        if ('number' === typeof instruction[2]) {
          url[key] = address.slice(0, index);
          address = address.slice(index + instruction[2]);
        } else {
          url[key] = address.slice(index);
          address = address.slice(0, index);
        }
      }
    } else if ((index = parse.exec(address))) {
      url[key] = index[1];
      address = address.slice(0, index.index);
    }

    url[key] = url[key] || (
      relative && instruction[3] ? location[key] || '' : ''
    );

    //
    // Hostname, host and protocol should be lowercased so they can be used to
    // create a proper `origin`.
    //
    if (instruction[4]) url[key] = url[key].toLowerCase();
  }

  //
  // Also parse the supplied query string in to an object. If we're supplied
  // with a custom parser as function use that instead of the default build-in
  // parser.
  //
  if (parser) url.query = parser(url.query);

  //
  // If the URL is relative, resolve the pathname against the base URL.
  //
  if (
      relative
    && location.slashes
    && url.pathname.charAt(0) !== '/'
    && (url.pathname !== '' || location.pathname !== '')
  ) {
    url.pathname = resolve(url.pathname, location.pathname);
  }

  //
  // Default to a / for pathname if none exists. This normalizes the URL
  // to always have a /
  //
  if (url.pathname.charAt(0) !== '/' && isSpecial(url.protocol)) {
    url.pathname = '/' + url.pathname;
  }

  //
  // We should not add port numbers if they are already the default port number
  // for a given protocol. As the host also contains the port number we're going
  // override it with the hostname which contains no port number.
  //
  if (!required(url.port, url.protocol)) {
    url.host = url.hostname;
    url.port = '';
  }

  //
  // Parse down the `auth` for the username and password.
  //
  url.username = url.password = '';

  if (url.auth) {
    index = url.auth.indexOf(':');

    if (~index) {
      url.username = url.auth.slice(0, index);
      url.username = encodeURIComponent(decodeURIComponent(url.username));

      url.password = url.auth.slice(index + 1);
      url.password = encodeURIComponent(decodeURIComponent(url.password))
    } else {
      url.username = encodeURIComponent(decodeURIComponent(url.auth));
    }

    url.auth = url.password ? url.username +':'+ url.password : url.username;
  }

  url.origin = url.protocol !== 'file:' && isSpecial(url.protocol) && url.host
    ? url.protocol +'//'+ url.host
    : 'null';

  //
  // The href is just the compiled result.
  //
  url.href = url.toString();
}

/**
 * This is convenience method for changing properties in the URL instance to
 * insure that they all propagate correctly.
 *
 * @param {String} part          Property we need to adjust.
 * @param {Mixed} value          The newly assigned value.
 * @param {Boolean|Function} fn  When setting the query, it will be the function
 *                               used to parse the query.
 *                               When setting the protocol, double slash will be
 *                               removed from the final url if it is true.
 * @returns {URL} URL instance for chaining.
 * @public
 */
function set(part, value, fn) {
  var url = this;

  switch (part) {
    case 'query':
      if ('string' === typeof value && value.length) {
        value = (fn || qs.parse)(value);
      }

      url[part] = value;
      break;

    case 'port':
      url[part] = value;

      if (!required(value, url.protocol)) {
        url.host = url.hostname;
        url[part] = '';
      } else if (value) {
        url.host = url.hostname +':'+ value;
      }

      break;

    case 'hostname':
      url[part] = value;

      if (url.port) value += ':'+ url.port;
      url.host = value;
      break;

    case 'host':
      url[part] = value;

      if (port.test(value)) {
        value = value.split(':');
        url.port = value.pop();
        url.hostname = value.join(':');
      } else {
        url.hostname = value;
        url.port = '';
      }

      break;

    case 'protocol':
      url.protocol = value.toLowerCase();
      url.slashes = !fn;
      break;

    case 'pathname':
    case 'hash':
      if (value) {
        var char = part === 'pathname' ? '/' : '#';
        url[part] = value.charAt(0) !== char ? char + value : value;
      } else {
        url[part] = value;
      }
      break;

    case 'username':
    case 'password':
      url[part] = encodeURIComponent(value);
      break;

    case 'auth':
      var index = value.indexOf(':');

      if (~index) {
        url.username = value.slice(0, index);
        url.username = encodeURIComponent(decodeURIComponent(url.username));

        url.password = value.slice(index + 1);
        url.password = encodeURIComponent(decodeURIComponent(url.password));
      } else {
        url.username = encodeURIComponent(decodeURIComponent(value));
      }
  }

  for (var i = 0; i < rules.length; i++) {
    var ins = rules[i];

    if (ins[4]) url[ins[1]] = url[ins[1]].toLowerCase();
  }

  url.auth = url.password ? url.username +':'+ url.password : url.username;

  url.origin = url.protocol !== 'file:' && isSpecial(url.protocol) && url.host
    ? url.protocol +'//'+ url.host
    : 'null';

  url.href = url.toString();

  return url;
}

/**
 * Transform the properties back in to a valid and full URL string.
 *
 * @param {Function} stringify Optional query stringify function.
 * @returns {String} Compiled version of the URL.
 * @public
 */
function toString(stringify) {
  if (!stringify || 'function' !== typeof stringify) stringify = qs.stringify;

  var query
    , url = this
    , host = url.host
    , protocol = url.protocol;

  if (protocol && protocol.charAt(protocol.length - 1) !== ':') protocol += ':';

  var result =
    protocol +
    ((url.protocol && url.slashes) || isSpecial(url.protocol) ? '//' : '');

  if (url.username) {
    result += url.username;
    if (url.password) result += ':'+ url.password;
    result += '@';
  } else if (url.password) {
    result += ':'+ url.password;
    result += '@';
  } else if (
    url.protocol !== 'file:' &&
    isSpecial(url.protocol) &&
    !host &&
    url.pathname !== '/'
  ) {
    //
    // Add back the empty userinfo, otherwise the original invalid URL
    // might be transformed into a valid one with `url.pathname` as host.
    //
    result += '@';
  }

  //
  // Trailing colon is removed from `url.host` when it is parsed. If it still
  // ends with a colon, then add back the trailing colon that was removed. This
  // prevents an invalid URL from being transformed into a valid one.
  //
  if (host[host.length - 1] === ':' || (port.test(url.hostname) && !url.port)) {
    host += ':';
  }

  result += host + url.pathname;

  query = 'object' === typeof url.query ? stringify(url.query) : url.query;
  if (query) result += '?' !== query.charAt(0) ? '?'+ query : query;

  if (url.hash) result += url.hash;

  return result;
}

Url.prototype = { set: set, toString: toString };

//
// Expose the URL parser and some additional properties that might be useful for
// others or testing.
//
Url.extractProtocol = extractProtocol;
Url.location = lolcation;
Url.trimLeft = trimLeft;
Url.qs = qs;

module.exports = Url;

}).call(this)}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{"querystringify":8,"requires-port":11}],15:[function(_dereq_,module,exports){
'use strict';

var alphabet = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-_'.split('')
  , length = 64
  , map = {}
  , seed = 0
  , i = 0
  , prev;

/**
 * Return a string representing the specified number.
 *
 * @param {Number} num The number to convert.
 * @returns {String} The string representation of the number.
 * @api public
 */
function encode(num) {
  var encoded = '';

  do {
    encoded = alphabet[num % length] + encoded;
    num = Math.floor(num / length);
  } while (num > 0);

  return encoded;
}

/**
 * Return the integer value specified by the given string.
 *
 * @param {String} str The string to convert.
 * @returns {Number} The integer value represented by the string.
 * @api public
 */
function decode(str) {
  var decoded = 0;

  for (i = 0; i < str.length; i++) {
    decoded = decoded * length + map[str.charAt(i)];
  }

  return decoded;
}

/**
 * Yeast: A tiny growing id generator.
 *
 * @returns {String} A unique id.
 * @api public
 */
function yeast() {
  var now = encode(+new Date());

  if (now !== prev) return seed = 0, prev = now;
  return now +'.'+ encode(seed++);
}

//
// Map each character to its index.
//
for (; i < length; i++) map[alphabet[i]] = i;

//
// Expose the `yeast`, `encode` and `decode` functions.
//
yeast.encode = encode;
yeast.decode = decode;
module.exports = yeast;

},{}],16:[function(_dereq_,module,exports){
/*globals require, define */
'use strict';

var EventEmitter = _dereq_('eventemitter3')
  , TickTock = _dereq_('tick-tock')
  , Recovery = _dereq_('recovery')
  , qs = _dereq_('querystringify')
  , inherits = _dereq_('inherits')
  , destroy = _dereq_('demolish')
  , yeast = _dereq_('yeast')
  , u2028 = /\u2028/g
  , u2029 = /\u2029/g;

/**
 * Context assertion, ensure that some of our public Primus methods are called
 * with the correct context to ensure that
 *
 * @param {Primus} self The context of the function.
 * @param {String} method The method name.
 * @api private
 */
function context(self, method) {
  if (self instanceof Primus) return;

  var failure = new Error('Primus#'+ method + '\'s context should called with a Primus instance');

  if ('function' !== typeof self.listeners || !self.listeners('error').length) {
    throw failure;
  }

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

//
// Sets the default connection URL, it uses the default origin of the browser
// when supported but degrades for older browsers. In Node.js, we cannot guess
// where the user wants to connect to, so we just default to localhost.
//
var defaultUrl;

try {
  if (location.origin) {
    defaultUrl = location.origin;
  } else {
    defaultUrl = location.protocol +'//'+ location.host;
  }
} catch (e) {
  defaultUrl = 'http://127.0.0.1';
}

/**
 * Primus is a real-time library agnostic framework for establishing real-time
 * connections with servers.
 *
 * Options:
 * - reconnect, configuration for the reconnect process.
 * - manual, don't automatically call `.open` to start the connection.
 * - websockets, force the use of WebSockets, even when you should avoid them.
 * - timeout, connect timeout, server didn't respond in a timely manner.
 * - pingTimeout, The maximum amount of time to wait for the server to send a ping.
 * - network, Use network events as leading method for network connection drops.
 * - strategy, Reconnection strategies.
 * - transport, Transport options.
 * - url, uri, The URL to use connect with the server.
 *
 * @constructor
 * @param {String} url The URL of your server.
 * @param {Object} options The configuration.
 * @api public
 */
function Primus(url, options) {
  if (!(this instanceof Primus)) return new Primus(url, options);

  Primus.Stream.call(this);

  if ('function' !== typeof this.client) {
    return this.critical(new Error(
      'The client library has not been compiled correctly, see '+
      'https://github.com/primus/primus#client-library for more details'
    ));
  }

  if ('object' === typeof url) {
    options = url;
    url = options.url || options.uri || defaultUrl;
  } else {
    options = options || {};
  }

  if ('ping' in options || 'pong' in options) {
    return this.critical(new Error(
      'The `ping` and `pong` options have been removed'
    ));
  }

  var primus = this;

  // The maximum number of messages that can be placed in queue.
  options.queueSize = 'queueSize' in options ? options.queueSize : Infinity;

  // Connection timeout duration.
  options.timeout = 'timeout' in options ? options.timeout : 10e3;

  // Stores the back off configuration.
  options.reconnect = 'reconnect' in options ? options.reconnect : {};

  // Heartbeat ping interval.
  options.pingTimeout = 'pingTimeout' in options ? options.pingTimeout : 45000;

  // Reconnect strategies.
  options.strategy = 'strategy' in options ? options.strategy : [];

  // Custom transport options.
  options.transport = 'transport' in options ? options.transport : {};

  primus.buffer = [];                           // Stores premature send data.
  primus.writable = true;                       // Silly stream compatibility.
  primus.readable = true;                       // Silly stream compatibility.
  primus.url = primus.parse(url || defaultUrl); // Parse the URL to a readable format.
  primus.readyState = Primus.CLOSED;            // The readyState of the connection.
  primus.options = options;                     // Reference to the supplied options.
  primus.timers = new TickTock(this);           // Contains all our timers.
  primus.socket = null;                         // Reference to the internal connection.
  primus.disconnect = false;                    // Did we receive a disconnect packet?
  primus.transport = options.transport;         // Transport options.
  primus.transformers = {                       // Message transformers.
    outgoing: [],
    incoming: []
  };

  //
  // Create our reconnection instance.
  //
  primus.recovery = new Recovery(options.reconnect);

  //
  // Parse the reconnection strategy. It can have the following strategies:
  //
  // - timeout: Reconnect when we have a network timeout.
  // - disconnect: Reconnect when we have an unexpected disconnect.
  // - online: Reconnect when we're back online.
  //
  if ('string' === typeof options.strategy) {
    options.strategy = options.strategy.split(/\s?,\s?/g);
  }

  if (false === options.strategy) {
    //
    // Strategies are disabled, but we still need an empty array to join it in
    // to nothing.
    //
    options.strategy = [];
  } else if (!options.strategy.length) {
    options.strategy.push('disconnect', 'online');

    //
    // Timeout based reconnection should only be enabled conditionally. When
    // authorization is enabled it could trigger.
    //
    if (!this.authorization) options.strategy.push('timeout');
  }

  options.strategy = options.strategy.join(',').toLowerCase();

  //
  // Force the use of WebSockets, even when we've detected some potential
  // broken WebSocket implementation.
  //
  if ('websockets' in options) {
    primus.AVOID_WEBSOCKETS = !options.websockets;
  }

  //
  // Force or disable the use of NETWORK events as leading client side
  // disconnection detection.
  //
  if ('network' in options) {
    primus.NETWORK_EVENTS = options.network;
  }

  //
  // Check if the user wants to manually initialise a connection. If they don't,
  // we want to do it after a really small timeout so we give the users enough
  // time to listen for `error` events etc.
  //
  if (!options.manual) primus.timers.setTimeout('open', function open() {
    primus.timers.clear('open');
    primus.open();
  }, 0);

  primus.initialise(options);
}

/**
 * Simple require wrapper to make browserify, node and require.js play nice.
 *
 * @param {String} name The module to require.
 * @returns {Object|Undefined} The module that we required.
 * @api private
 */
Primus.requires = Primus.require = function requires(name) {
  if ('function' !== typeof _dereq_) return undefined;

  return !('function' === typeof define && define.amd)
    ? _dereq_(name)
    : undefined;
};

//
// It's possible that we're running in Node.js or in a Node.js compatible
// environment. In this cases we try to inherit from the Stream base class.
//
try {
  Primus.Stream = Primus.requires('stream');
} catch (e) { }

if (!Primus.Stream) Primus.Stream = EventEmitter;

inherits(Primus, Primus.Stream);

/**
 * Primus readyStates, used internally to set the correct ready state.
 *
 * @type {Number}
 * @private
 */
Primus.OPENING = 1;   // We're opening the connection.
Primus.CLOSED  = 2;   // No active connection.
Primus.OPEN    = 3;   // The connection is open.

/**
 * Are we working with a potentially broken WebSockets implementation? This
 * boolean can be used by transformers to remove `WebSockets` from their
 * supported transports.
 *
 * @type {Boolean}
 * @private
 */
Primus.prototype.AVOID_WEBSOCKETS = false;

/**
 * Some browsers support registering emitting `online` and `offline` events when
 * the connection has been dropped on the client. We're going to detect it in
 * a simple `try {} catch (e) {}` statement so we don't have to do complicated
 * feature detection.
 *
 * @type {Boolean}
 * @private
 */
Primus.prototype.NETWORK_EVENTS = false;
Primus.prototype.online = true;

try {
  if (
       Primus.prototype.NETWORK_EVENTS = 'onLine' in navigator
    && (window.addEventListener || document.body.attachEvent)
  ) {
    if (!navigator.onLine) {
      Primus.prototype.online = false;
    }
  }
} catch (e) { }

/**
 * The Ark contains all our plugins definitions. It's namespaced by
 * name => plugin.
 *
 * @type {Object}
 * @private
 */
Primus.prototype.ark = {};

/**
 * Simple emit wrapper that returns a function that emits an event once it's
 * called. This makes it easier for transports to emit specific events.
 *
 * @returns {Function} A function that will emit the event when called.
 * @api public
 */
Primus.prototype.emits = _dereq_('emits');

/**
 * Return the given plugin.
 *
 * @param {String} name The name of the plugin.
 * @returns {Object|undefined} The plugin or undefined.
 * @api public
 */
Primus.prototype.plugin = function plugin(name) {
  context(this, 'plugin');

  if (name) return this.ark[name];

  var plugins = {};

  for (name in this.ark) {
    plugins[name] = this.ark[name];
  }

  return plugins;
};

/**
 * Checks if the given event is an emitted event by Primus.
 *
 * @param {String} evt The event name.
 * @returns {Boolean} Indication of the event is reserved for internal use.
 * @api public
 */
Primus.prototype.reserved = function reserved(evt) {
  return (/^(incoming|outgoing)::/).test(evt)
  || evt in this.reserved.events;
};

/**
 * The actual events that are used by the client.
 *
 * @type {Object}
 * @public
 */
Primus.prototype.reserved.events = {
  'reconnect scheduled': 1,
  'reconnect timeout': 1,
  'readyStateChange': 1,
  'reconnect failed': 1,
  'reconnected': 1,
  'reconnect': 1,
  'offline': 1,
  'timeout': 1,
  'destroy': 1,
  'online': 1,
  'error': 1,
  'close': 1,
  'open': 1,
  'data': 1,
  'end': 1
};

/**
 * Initialise the Primus and setup all parsers and internal listeners.
 *
 * @param {Object} options The original options object.
 * @returns {Primus}
 * @api private
 */
Primus.prototype.initialise = function initialise(options) {
  var primus = this;

  primus.recovery
  .on('reconnected', primus.emits('reconnected'))
  .on('reconnect failed', primus.emits('reconnect failed', function failed(next) {
    primus.emit('end');
    next();
  }))
  .on('reconnect timeout', primus.emits('reconnect timeout'))
  .on('reconnect scheduled', primus.emits('reconnect scheduled'))
  .on('reconnect', primus.emits('reconnect', function reconnect(next) {
    primus.emit('outgoing::reconnect');
    next();
  }));

  primus.on('outgoing::open', function opening() {
    var readyState = primus.readyState;

    primus.readyState = Primus.OPENING;
    if (readyState !== primus.readyState) {
      primus.emit('readyStateChange', 'opening');
    }
  });

  primus.on('incoming::open', function opened() {
    var readyState = primus.readyState;

    if (primus.recovery.reconnecting()) {
      primus.recovery.reconnected();
    }

    //
    // The connection has been opened so we should set our state to
    // (writ|read)able so our stream compatibility works as intended.
    //
    primus.writable = true;
    primus.readable = true;

    //
    // Make sure we are flagged as `online` as we've successfully opened the
    // connection.
    //
    if (!primus.online) {
      primus.online = true;
      primus.emit('online');
    }

    primus.readyState = Primus.OPEN;
    if (readyState !== primus.readyState) {
      primus.emit('readyStateChange', 'open');
    }

    primus.heartbeat();

    if (primus.buffer.length) {
      var data = primus.buffer.slice()
        , length = data.length
        , i = 0;

      primus.buffer.length = 0;

      for (; i < length; i++) {
        primus._write(data[i]);
      }
    }

    primus.emit('open');
  });

  primus.on('incoming::ping', function ping(time) {
    primus.online = true;
    primus.heartbeat();
    primus.emit('outgoing::pong', time);
    primus._write('primus::pong::'+ time);
  });

  primus.on('incoming::error', function error(e) {
    var connect = primus.timers.active('connect')
      , err = e;

    //
    // When the error is not an Error instance we try to normalize it.
    //
    if ('string' === typeof e) {
      err = new Error(e);
    } else if (!(e instanceof Error) && 'object' === typeof e) {
      //
      // BrowserChannel and SockJS returns an object which contains some
      // details of the error. In order to have a proper error we "copy" the
      // details in an Error instance.
      //
      err = new Error(e.message || e.reason);
      for (var key in e) {
        if (Object.prototype.hasOwnProperty.call(e, key))
          err[key] = e[key];
      }
    }
    //
    // We're still doing a reconnect attempt, it could be that we failed to
    // connect because the server was down. Failing connect attempts should
    // always emit an `error` event instead of a `open` event.
    //
    //
    if (primus.recovery.reconnecting()) return primus.recovery.reconnected(err);
    if (primus.listeners('error').length) primus.emit('error', err);

    //
    // We received an error while connecting, this most likely the result of an
    // unauthorized access to the server.
    //
    if (connect) {
      if (~primus.options.strategy.indexOf('timeout')) {
        primus.recovery.reconnect();
      } else {
        primus.end();
      }
    }
  });

  primus.on('incoming::data', function message(raw) {
    primus.decoder(raw, function decoding(err, data) {
      //
      // Do a "safe" emit('error') when we fail to parse a message. We don't
      // want to throw here as listening to errors should be optional.
      //
      if (err) return primus.listeners('error').length && primus.emit('error', err);

      //
      // Handle all "primus::" prefixed protocol messages.
      //
      if (primus.protocol(data)) return;
      primus.transforms(primus, primus, 'incoming', data, raw);
    });
  });

  primus.on('incoming::end', function end() {
    var readyState = primus.readyState;

    //
    // This `end` started with the receiving of a primus::server::close packet
    // which indicated that the user/developer on the server closed the
    // connection and it was not a result of a network disruption. So we should
    // kill the connection without doing a reconnect.
    //
    if (primus.disconnect) {
      primus.disconnect = false;

      return primus.end();
    }

    //
    // Always set the readyState to closed, and if we're still connecting, close
    // the connection so we're sure that everything after this if statement block
    // is only executed because our readyState is set to `open`.
    //
    primus.readyState = Primus.CLOSED;
    if (readyState !== primus.readyState) {
      primus.emit('readyStateChange', 'end');
    }

    if (primus.timers.active('connect')) primus.end();
    if (readyState !== Primus.OPEN) {
      return primus.recovery.reconnecting()
        ? primus.recovery.reconnect()
        : false;
    }

    this.writable = false;
    this.readable = false;

    //
    // Clear all timers in case we're not going to reconnect.
    //
    this.timers.clear();

    //
    // Fire the `close` event as an indication of connection disruption.
    // This is also fired by `primus#end` so it is emitted in all cases.
    //
    primus.emit('close');

    //
    // The disconnect was unintentional, probably because the server has
    // shutdown, so if the reconnection is enabled start a reconnect procedure.
    //
    if (~primus.options.strategy.indexOf('disconnect')) {
      return primus.recovery.reconnect();
    }

    primus.emit('outgoing::end');
    primus.emit('end');
  });

  //
  // Setup the real-time client.
  //
  primus.client();

  //
  // Process the potential plugins.
  //
  for (var plugin in primus.ark) {
    primus.ark[plugin].call(primus, primus, options);
  }

  //
  // NOTE: The following code is only required if we're supporting network
  // events as it requires access to browser globals.
  //
  if (!primus.NETWORK_EVENTS) return primus;

  /**
   * Handler for offline notifications.
   *
   * @api private
   */
  primus.offlineHandler = function offline() {
    if (!primus.online) return; // Already or still offline, bailout.

    primus.online = false;
    primus.emit('offline');
    primus.end();

    //
    // It is certainly possible that we're in a reconnection loop and that the
    // user goes offline. In this case we want to kill the existing attempt so
    // when the user goes online, it will attempt to reconnect freshly again.
    //
    primus.recovery.reset();
  };

  /**
   * Handler for online notifications.
   *
   * @api private
   */
  primus.onlineHandler = function online() {
    if (primus.online) return; // Already or still online, bailout.

    primus.online = true;
    primus.emit('online');

    if (~primus.options.strategy.indexOf('online')) {
      primus.recovery.reconnect();
    }
  };

  if (window.addEventListener) {
    window.addEventListener('offline', primus.offlineHandler, false);
    window.addEventListener('online', primus.onlineHandler, false);
  } else if (document.body.attachEvent){
    document.body.attachEvent('onoffline', primus.offlineHandler);
    document.body.attachEvent('ononline', primus.onlineHandler);
  }

  return primus;
};

/**
 * Really dead simple protocol parser. We simply assume that every message that
 * is prefixed with `primus::` could be used as some sort of protocol definition
 * for Primus.
 *
 * @param {String} msg The data.
 * @returns {Boolean} Is a protocol message.
 * @api private
 */
Primus.prototype.protocol = function protocol(msg) {
  if (
       'string' !== typeof msg
    || msg.indexOf('primus::') !== 0
  ) return false;

  var last = msg.indexOf(':', 8)
    , value = msg.slice(last + 2);

  switch (msg.slice(8,  last)) {
    case 'ping':
      this.emit('incoming::ping', +value);
      break;

    case 'server':
      //
      // The server is closing the connection, forcefully disconnect so we don't
      // reconnect again.
      //
      if ('close' === value) {
        this.disconnect = true;
      }
      break;

    case 'id':
      this.emit('incoming::id', value);
      break;

    //
    // Unknown protocol, somebody is probably sending `primus::` prefixed
    // messages.
    //
    default:
      return false;
  }

  return true;
};

/**
 * Execute the set of message transformers from Primus on the incoming or
 * outgoing message.
 * This function and it's content should be in sync with Spark#transforms in
 * spark.js.
 *
 * @param {Primus} primus Reference to the Primus instance with message transformers.
 * @param {Spark|Primus} connection Connection that receives or sends data.
 * @param {String} type The type of message, 'incoming' or 'outgoing'.
 * @param {Mixed} data The data to send or that has been received.
 * @param {String} raw The raw encoded data.
 * @returns {Primus}
 * @api public
 */
Primus.prototype.transforms = function transforms(primus, connection, type, data, raw) {
  var packet = { data: data }
    , fns = primus.transformers[type];

  //
  // Iterate in series over the message transformers so we can allow optional
  // asynchronous execution of message transformers which could for example
  // retrieve additional data from the server, do extra decoding or even
  // message validation.
  //
  (function transform(index, done) {
    var transformer = fns[index++];

    if (!transformer) return done();

    if (1 === transformer.length) {
      if (false === transformer.call(connection, packet)) {
        //
        // When false is returned by an incoming transformer it means that's
        // being handled by the transformer and we should not emit the `data`
        // event.
        //
        return;
      }

      return transform(index, done);
    }

    transformer.call(connection, packet, function finished(err, arg) {
      if (err) return connection.emit('error', err);
      if (false === arg) return;

      transform(index, done);
    });
  }(0, function done() {
    //
    // We always emit 2 arguments for the data event, the first argument is the
    // parsed data and the second argument is the raw string that we received.
    // This allows you, for example, to do some validation on the parsed data
    // and then save the raw string in your database without the stringify
    // overhead.
    //
    if ('incoming' === type) return connection.emit('data', packet.data, raw);

    connection._write(packet.data);
  }));

  return this;
};

/**
 * Retrieve the current id from the server.
 *
 * @param {Function} fn Callback function.
 * @returns {Primus}
 * @api public
 */
Primus.prototype.id = function id(fn) {
  if (this.socket && this.socket.id) return fn(this.socket.id);

  this._write('primus::id::');
  return this.once('incoming::id', fn);
};

/**
 * Establish a connection with the server. When this function is called we
 * assume that we don't have any open connections. If you do call it when you
 * have a connection open, it could cause duplicate connections.
 *
 * @returns {Primus}
 * @api public
 */
Primus.prototype.open = function open() {
  context(this, 'open');

  //
  // Only start a `connection timeout` procedure if we're not reconnecting as
  // that shouldn't count as an initial connection. This should be started
  // before the connection is opened to capture failing connections and kill the
  // timeout.
  //
  if (!this.recovery.reconnecting() && this.options.timeout) this.timeout();

  this.emit('outgoing::open');
  return this;
};

/**
 * Send a new message.
 *
 * @param {Mixed} data The data that needs to be written.
 * @returns {Boolean} Always returns true as we don't support back pressure.
 * @api public
 */
Primus.prototype.write = function write(data) {
  context(this, 'write');
  this.transforms(this, this, 'outgoing', data);

  return true;
};

/**
 * The actual message writer.
 *
 * @param {Mixed} data The message that needs to be written.
 * @returns {Boolean} Successful write to the underlaying transport.
 * @api private
 */
Primus.prototype._write = function write(data) {
  var primus = this;

  //
  // The connection is closed, normally this would already be done in the
  // `spark.write` method, but as `_write` is used internally, we should also
  // add the same check here to prevent potential crashes by writing to a dead
  // socket.
  //
  if (Primus.OPEN !== primus.readyState) {
    //
    // If the buffer is at capacity, remove the first item.
    //
    if (this.buffer.length === this.options.queueSize) {
      this.buffer.splice(0, 1);
    }

    this.buffer.push(data);
    return false;
  }

  primus.encoder(data, function encoded(err, packet) {
    //
    // Do a "safe" emit('error') when we fail to parse a message. We don't
    // want to throw here as listening to errors should be optional.
    //
    if (err) return primus.listeners('error').length && primus.emit('error', err);

    //
    // Hack 1: \u2028 and \u2029 are allowed inside a JSON string, but JavaScript
    // defines them as newline separators. Unescaped control characters are not
    // allowed inside JSON strings, so this causes an error at parse time. We
    // work around this issue by escaping these characters. This can cause
    // errors with JSONP requests or if the string is just evaluated.
    //
    if ('string' === typeof packet) {
      if (~packet.indexOf('\u2028')) packet = packet.replace(u2028, '\\u2028');
      if (~packet.indexOf('\u2029')) packet = packet.replace(u2029, '\\u2029');
    }

    primus.emit('outgoing::data', packet);
  });

  return true;
};

/**
 * Set a timer that, upon expiration, closes the client.
 *
 * @returns {Primus}
 * @api private
 */
Primus.prototype.heartbeat = function heartbeat() {
  if (!this.options.pingTimeout) return this;

  this.timers.clear('heartbeat');
  this.timers.setTimeout('heartbeat', function expired() {
    //
    // The network events already captured the offline event.
    //
    if (!this.online) return;

    this.online = false;
    this.emit('offline');
    this.emit('incoming::end');
  }, this.options.pingTimeout);

  return this;
};

/**
 * Start a connection timeout.
 *
 * @returns {Primus}
 * @api private
 */
Primus.prototype.timeout = function timeout() {
  var primus = this;

  /**
   * Remove all references to the timeout listener as we've received an event
   * that can be used to determine state.
   *
   * @api private
   */
  function remove() {
    primus.removeListener('error', remove)
          .removeListener('open', remove)
          .removeListener('end', remove)
          .timers.clear('connect');
  }

  primus.timers.setTimeout('connect', function expired() {
    remove(); // Clean up old references.

    if (primus.readyState === Primus.OPEN || primus.recovery.reconnecting()) {
      return;
    }

    primus.emit('timeout');

    //
    // We failed to connect to the server.
    //
    if (~primus.options.strategy.indexOf('timeout')) {
      primus.recovery.reconnect();
    } else {
      primus.end();
    }
  }, primus.options.timeout);

  return primus.on('error', remove)
    .on('open', remove)
    .on('end', remove);
};

/**
 * Close the connection completely.
 *
 * @param {Mixed} data last packet of data.
 * @returns {Primus}
 * @api public
 */
Primus.prototype.end = function end(data) {
  context(this, 'end');

  if (
      this.readyState === Primus.CLOSED
    && !this.timers.active('connect')
    && !this.timers.active('open')
  ) {
    //
    // If we are reconnecting stop the reconnection procedure.
    //
    if (this.recovery.reconnecting()) {
      this.recovery.reset();
      this.emit('end');
    }

    return this;
  }

  if (data !== undefined) this.write(data);

  this.writable = false;
  this.readable = false;

  var readyState = this.readyState;
  this.readyState = Primus.CLOSED;

  if (readyState !== this.readyState) {
    this.emit('readyStateChange', 'end');
  }

  this.timers.clear();
  this.emit('outgoing::end');
  this.emit('close');
  this.emit('end');

  return this;
};

/**
 * Completely demolish the Primus instance and forcefully nuke all references.
 *
 * @returns {Boolean}
 * @api public
 */
Primus.prototype.destroy = destroy('url timers options recovery socket transport transformers', {
  before: 'end',
  after: ['removeAllListeners', function detach() {
    if (!this.NETWORK_EVENTS) return;

    if (window.addEventListener) {
      window.removeEventListener('offline', this.offlineHandler);
      window.removeEventListener('online', this.onlineHandler);
    } else if (document.body.attachEvent){
      document.body.detachEvent('onoffline', this.offlineHandler);
      document.body.detachEvent('ononline', this.onlineHandler);
    }
  }]
});

/**
 * Create a shallow clone of a given object.
 *
 * @param {Object} obj The object that needs to be cloned.
 * @returns {Object} Copy.
 * @api private
 */
Primus.prototype.clone = function clone(obj) {
  return this.merge({}, obj);
};

/**
 * Merge different objects in to one target object.
 *
 * @param {Object} target The object where everything should be merged in.
 * @returns {Object} Original target with all merged objects.
 * @api private
 */
Primus.prototype.merge = function merge(target) {
  for (var i = 1, key, obj; i < arguments.length; i++) {
    obj = arguments[i];

    for (key in obj) {
      if (Object.prototype.hasOwnProperty.call(obj, key))
        target[key] = obj[key];
    }
  }

  return target;
};

/**
 * Parse the connection string.
 *
 * @type {Function}
 * @param {String} url Connection URL.
 * @returns {Object} Parsed connection.
 * @api private
 */
Primus.prototype.parse = _dereq_('url-parse');

/**
 * Parse a query string.
 *
 * @param {String} query The query string that needs to be parsed.
 * @returns {Object} Parsed query string.
 * @api private
 */
Primus.prototype.querystring = qs.parse;
/**
 * Transform a query string object back into string equiv.
 *
 * @param {Object} obj The query string object.
 * @returns {String}
 * @api private
 */
Primus.prototype.querystringify = qs.stringify;

/**
 * Generates a connection URI.
 *
 * @param {String} protocol The protocol that should used to crate the URI.
 * @returns {String|options} The URL.
 * @api private
 */
Primus.prototype.uri = function uri(options) {
  var url = this.url
    , server = []
    , qsa = false;

  //
  // Query strings are only allowed when we've received clearance for it.
  //
  if (options.query) qsa = true;

  options = options || {};
  options.protocol = 'protocol' in options
    ? options.protocol
    : 'http:';
  options.query = url.query && qsa
    ? url.query.slice(1)
    : false;
  options.secure = 'secure' in options
    ? options.secure
    : url.protocol === 'https:' || url.protocol === 'wss:';
  options.auth = 'auth' in options
    ? options.auth
    : url.auth;
  options.pathname = 'pathname' in options
    ? options.pathname
    : this.pathname;
  options.port = 'port' in options
    ? +options.port
    : +url.port || (options.secure ? 443 : 80);

  //
  // We need to make sure that we create a unique connection URL every time to
  // prevent back forward cache from becoming an issue. We're doing this by
  // forcing an cache busting query string in to the URL.
  //
  var querystring = this.querystring(options.query || '');
  querystring._primuscb = yeast();
  options.query = this.querystringify(querystring);

  //
  // Allow transformation of the options before we construct a full URL from it.
  //
  this.emit('outgoing::url', options);

  //
  // Automatically suffix the protocol so we can supply `ws:` and `http:` and
  // it gets transformed correctly.
  //
  server.push(options.secure ? options.protocol.replace(':', 's:') : options.protocol, '');

  server.push(options.auth ? options.auth +'@'+ url.host : url.host);

  //
  // Pathnames are optional as some Transformers would just use the pathname
  // directly.
  //
  if (options.pathname) server.push(options.pathname.slice(1));

  //
  // Optionally add a search query.
  //
  if (qsa) server[server.length - 1] += '?'+ options.query;
  else delete options.query;

  if (options.object) return options;
  return server.join('/');
};

/**
 * Register a new message transformer. This allows you to easily manipulate incoming
 * and outgoing data which is particularity handy for plugins that want to send
 * meta data together with the messages.
 *
 * @param {String} type Incoming or outgoing
 * @param {Function} fn A new message transformer.
 * @returns {Primus}
 * @api public
 */
Primus.prototype.transform = function transform(type, fn) {
  context(this, 'transform');

  if (!(type in this.transformers)) {
    return this.critical(new Error('Invalid transformer type'));
  }

  this.transformers[type].push(fn);
  return this;
};

/**
 * A critical error has occurred, if we have an `error` listener, emit it there.
 * If not, throw it, so we get a stack trace + proper error message.
 *
 * @param {Error} err The critical error.
 * @returns {Primus}
 * @api private
 */
Primus.prototype.critical = function critical(err) {
  if (this.emit('error', err)) return this;

  throw err;
};

/**
 * Syntax sugar, adopt a Socket.IO like API.
 *
 * @param {String} url The URL we want to connect to.
 * @param {Object} options Connection options.
 * @returns {Primus}
 * @api public
 */
Primus.connect = function connect(url, options) {
  return new Primus(url, options);
};

//
// Expose the EventEmitter so it can be re-used by wrapping libraries we're also
// exposing the Stream interface.
//
Primus.EventEmitter = EventEmitter;

//
// These libraries are automatically inserted at the server-side using the
// Primus#library method.
//
Primus.prototype.client = function client() {
  var onmessage = this.emits('incoming::data')
    , onerror = this.emits('incoming::error')
    , onopen = this.emits('incoming::open')
    , onclose = this.emits('incoming::end')
    , primus = this
    , socket;

  //
  // Select an available Engine.IO factory.
  //
  var factory = (function factory() {
    if ('undefined' !== typeof eio) return eio;

    try {
      var Socket = Primus.requires('engine.io-client').Socket;

      return function eio(options) {
        return new Socket(options);
      }
    } catch (e) {}

    return undefined;
  })();

  if (!factory) return primus.critical(new Error(
    'Missing required `engine.io-client` module. ' +
    'Please run `npm install --save engine.io-client`'
  ));

  //
  // Connect to the given URL.
  //
  primus.on('outgoing::open', function opening() {
    primus.emit('outgoing::end');

    primus.socket = socket = factory(primus.merge(primus.transport,
      primus.url,
      primus.uri({ protocol: 'http:', query: true, object: true }), {
      //
      // Never remember upgrades as switching from a WIFI to a 3G connection
      // could still get your connection blocked as 3G connections are usually
      // behind a reverse proxy so ISP's can optimize mobile traffic by
      // caching requests.
      //
      rememberUpgrade: false,

      //
      // Binary support in Engine.IO breaks a shit things. Turn it off for now.
      //
      forceBase64: true,

      //
      // Force timestamps on every single connection. Engine.IO only does this
      // for polling by default, but WebSockets require an explicit `true`
      // boolean.
      //
      timestampRequests: true,
      path: this.pathname,
      transports: !primus.AVOID_WEBSOCKETS
        ? ['polling', 'websocket']
        : ['polling']
    }));

    //
    // Setup the Event handlers.
    //
    socket.on('message', onmessage);
    socket.on('error', onerror);
    socket.on('close', onclose);
    socket.on('open', onopen);
  });

  //
  // We need to write a new message to the socket.
  //
  primus.on('outgoing::data', function write(message) {
    if (socket) socket.send(message);
  });

  //
  // Attempt to reconnect the socket.
  //
  primus.on('outgoing::reconnect', function reconnect() {
    primus.emit('outgoing::open');
  });

  //
  // We need to close the socket.
  //
  primus.on('outgoing::end', function close() {
    if (!socket) return;

    socket.removeListener('message', onmessage);
    socket.removeListener('error', onerror);
    socket.removeListener('close', onclose);
    socket.removeListener('open', onopen);
    socket.close();
    socket = null;
  });
};
Primus.prototype.authorization = false;
Primus.prototype.pathname = "/sugar";
Primus.prototype.encoder = function encoder(data, fn) {
  var err;

  try { data = JSON.stringify(data); }
  catch (e) { err = e; }

  fn(err, data);
};
Primus.prototype.decoder = function decoder(data, fn) {
  var err;

  if ('string' !== typeof data) return fn(err, data);

  try { data = JSON.parse(data); }
  catch (e) { err = e; }

  fn(err, data);
};
Primus.prototype.version = "8.0.9";

//
// Expose the library.
//
module.exports = Primus;

},{"demolish":1,"emits":2,"eventemitter3":3,"inherits":4,"querystringify":8,"recovery":9,"tick-tock":12,"url-parse":14,"yeast":15}]},{},[16])(16)
;
  return Primus;
},
[
function (Primus) {
(function (f) {
  var g;

  if (typeof window !== 'undefined') {
    g = window;
  } else if (typeof self !== 'undefined') {
    g = self;
  }

  g.eio = f();
})(function () {
var eio = (function () {
  'use strict';

  function _typeof(obj) {
    "@babel/helpers - typeof";

    return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (obj) {
      return typeof obj;
    } : function (obj) {
      return obj && "function" == typeof Symbol && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj;
    }, _typeof(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, _toPropertyKey(descriptor.key), descriptor);
    }
  }
  function _createClass(Constructor, protoProps, staticProps) {
    if (protoProps) _defineProperties(Constructor.prototype, protoProps);
    if (staticProps) _defineProperties(Constructor, staticProps);
    Object.defineProperty(Constructor, "prototype", {
      writable: false
    });
    return Constructor;
  }
  function _extends() {
    _extends = Object.assign ? Object.assign.bind() : function (target) {
      for (var i = 1; i < arguments.length; i++) {
        var source = arguments[i];
        for (var key in source) {
          if (Object.prototype.hasOwnProperty.call(source, key)) {
            target[key] = source[key];
          }
        }
      }
      return target;
    };
    return _extends.apply(this, arguments);
  }
  function _inherits(subClass, superClass) {
    if (typeof superClass !== "function" && superClass !== null) {
      throw new TypeError("Super expression must either be null or a function");
    }
    subClass.prototype = Object.create(superClass && superClass.prototype, {
      constructor: {
        value: subClass,
        writable: true,
        configurable: true
      }
    });
    Object.defineProperty(subClass, "prototype", {
      writable: false
    });
    if (superClass) _setPrototypeOf(subClass, superClass);
  }
  function _getPrototypeOf(o) {
    _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf.bind() : function _getPrototypeOf(o) {
      return o.__proto__ || Object.getPrototypeOf(o);
    };
    return _getPrototypeOf(o);
  }
  function _setPrototypeOf(o, p) {
    _setPrototypeOf = Object.setPrototypeOf ? Object.setPrototypeOf.bind() : function _setPrototypeOf(o, p) {
      o.__proto__ = p;
      return o;
    };
    return _setPrototypeOf(o, p);
  }
  function _isNativeReflectConstruct() {
    if (typeof Reflect === "undefined" || !Reflect.construct) return false;
    if (Reflect.construct.sham) return false;
    if (typeof Proxy === "function") return true;
    try {
      Boolean.prototype.valueOf.call(Reflect.construct(Boolean, [], function () {}));
      return true;
    } catch (e) {
      return false;
    }
  }
  function _construct(Parent, args, Class) {
    if (_isNativeReflectConstruct()) {
      _construct = Reflect.construct.bind();
    } else {
      _construct = function _construct(Parent, args, Class) {
        var a = [null];
        a.push.apply(a, args);
        var Constructor = Function.bind.apply(Parent, a);
        var instance = new Constructor();
        if (Class) _setPrototypeOf(instance, Class.prototype);
        return instance;
      };
    }
    return _construct.apply(null, arguments);
  }
  function _isNativeFunction(fn) {
    return Function.toString.call(fn).indexOf("[native code]") !== -1;
  }
  function _wrapNativeSuper(Class) {
    var _cache = typeof Map === "function" ? new Map() : undefined;
    _wrapNativeSuper = function _wrapNativeSuper(Class) {
      if (Class === null || !_isNativeFunction(Class)) return Class;
      if (typeof Class !== "function") {
        throw new TypeError("Super expression must either be null or a function");
      }
      if (typeof _cache !== "undefined") {
        if (_cache.has(Class)) return _cache.get(Class);
        _cache.set(Class, Wrapper);
      }
      function Wrapper() {
        return _construct(Class, arguments, _getPrototypeOf(this).constructor);
      }
      Wrapper.prototype = Object.create(Class.prototype, {
        constructor: {
          value: Wrapper,
          enumerable: false,
          writable: true,
          configurable: true
        }
      });
      return _setPrototypeOf(Wrapper, Class);
    };
    return _wrapNativeSuper(Class);
  }
  function _assertThisInitialized(self) {
    if (self === void 0) {
      throw new ReferenceError("this hasn't been initialised - super() hasn't been called");
    }
    return self;
  }
  function _possibleConstructorReturn(self, call) {
    if (call && (typeof call === "object" || typeof call === "function")) {
      return call;
    } else if (call !== void 0) {
      throw new TypeError("Derived constructors may only return object or undefined");
    }
    return _assertThisInitialized(self);
  }
  function _createSuper(Derived) {
    var hasNativeReflectConstruct = _isNativeReflectConstruct();
    return function _createSuperInternal() {
      var Super = _getPrototypeOf(Derived),
        result;
      if (hasNativeReflectConstruct) {
        var NewTarget = _getPrototypeOf(this).constructor;
        result = Reflect.construct(Super, arguments, NewTarget);
      } else {
        result = Super.apply(this, arguments);
      }
      return _possibleConstructorReturn(this, result);
    };
  }
  function _superPropBase(object, property) {
    while (!Object.prototype.hasOwnProperty.call(object, property)) {
      object = _getPrototypeOf(object);
      if (object === null) break;
    }
    return object;
  }
  function _get() {
    if (typeof Reflect !== "undefined" && Reflect.get) {
      _get = Reflect.get.bind();
    } else {
      _get = function _get(target, property, receiver) {
        var base = _superPropBase(target, property);
        if (!base) return;
        var desc = Object.getOwnPropertyDescriptor(base, property);
        if (desc.get) {
          return desc.get.call(arguments.length < 3 ? target : receiver);
        }
        return desc.value;
      };
    }
    return _get.apply(this, arguments);
  }
  function _toPrimitive(input, hint) {
    if (typeof input !== "object" || input === null) return input;
    var prim = input[Symbol.toPrimitive];
    if (prim !== undefined) {
      var res = prim.call(input, hint || "default");
      if (typeof res !== "object") return res;
      throw new TypeError("@@toPrimitive must return a primitive value.");
    }
    return (hint === "string" ? String : Number)(input);
  }
  function _toPropertyKey(arg) {
    var key = _toPrimitive(arg, "string");
    return typeof key === "symbol" ? key : String(key);
  }

  var PACKET_TYPES = Object.create(null); // no Map = no polyfill
  PACKET_TYPES["open"] = "0";
  PACKET_TYPES["close"] = "1";
  PACKET_TYPES["ping"] = "2";
  PACKET_TYPES["pong"] = "3";
  PACKET_TYPES["message"] = "4";
  PACKET_TYPES["upgrade"] = "5";
  PACKET_TYPES["noop"] = "6";
  var PACKET_TYPES_REVERSE = Object.create(null);
  Object.keys(PACKET_TYPES).forEach(function (key) {
    PACKET_TYPES_REVERSE[PACKET_TYPES[key]] = key;
  });
  var ERROR_PACKET = {
    type: "error",
    data: "parser error"
  };

  var withNativeBlob = typeof Blob === "function" || typeof Blob !== "undefined" && Object.prototype.toString.call(Blob) === "[object BlobConstructor]";
  var withNativeArrayBuffer$1 = typeof ArrayBuffer === "function";
  // ArrayBuffer.isView method is not defined in IE10
  var isView = function isView(obj) {
    return typeof ArrayBuffer.isView === "function" ? ArrayBuffer.isView(obj) : obj && obj.buffer instanceof ArrayBuffer;
  };
  var encodePacket = function encodePacket(_ref, supportsBinary, callback) {
    var type = _ref.type,
      data = _ref.data;
    if (withNativeBlob && data instanceof Blob) {
      if (supportsBinary) {
        return callback(data);
      } else {
        return encodeBlobAsBase64(data, callback);
      }
    } else if (withNativeArrayBuffer$1 && (data instanceof ArrayBuffer || isView(data))) {
      if (supportsBinary) {
        return callback(data);
      } else {
        return encodeBlobAsBase64(new Blob([data]), callback);
      }
    }
    // plain string
    return callback(PACKET_TYPES[type] + (data || ""));
  };
  var encodeBlobAsBase64 = function encodeBlobAsBase64(data, callback) {
    var fileReader = new FileReader();
    fileReader.onload = function () {
      var content = fileReader.result.split(",")[1];
      callback("b" + (content || ""));
    };
    return fileReader.readAsDataURL(data);
  };
  function toArray(data) {
    if (data instanceof Uint8Array) {
      return data;
    } else if (data instanceof ArrayBuffer) {
      return new Uint8Array(data);
    } else {
      return new Uint8Array(data.buffer, data.byteOffset, data.byteLength);
    }
  }
  var TEXT_ENCODER;
  function encodePacketToBinary(packet, callback) {
    if (withNativeBlob && packet.data instanceof Blob) {
      return packet.data.arrayBuffer().then(toArray).then(callback);
    } else if (withNativeArrayBuffer$1 && (packet.data instanceof ArrayBuffer || isView(packet.data))) {
      return callback(toArray(packet.data));
    }
    encodePacket(packet, false, function (encoded) {
      if (!TEXT_ENCODER) {
        TEXT_ENCODER = new TextEncoder();
      }
      callback(TEXT_ENCODER.encode(encoded));
    });
  }

  // imported from https://github.com/socketio/base64-arraybuffer
  var chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
  // Use a lookup table to find the index.
  var lookup = typeof Uint8Array === 'undefined' ? [] : new Uint8Array(256);
  for (var i$1 = 0; i$1 < chars.length; i$1++) {
    lookup[chars.charCodeAt(i$1)] = i$1;
  }
  var decode$1 = function decode(base64) {
    var bufferLength = base64.length * 0.75,
      len = base64.length,
      i,
      p = 0,
      encoded1,
      encoded2,
      encoded3,
      encoded4;
    if (base64[base64.length - 1] === '=') {
      bufferLength--;
      if (base64[base64.length - 2] === '=') {
        bufferLength--;
      }
    }
    var arraybuffer = new ArrayBuffer(bufferLength),
      bytes = new Uint8Array(arraybuffer);
    for (i = 0; i < len; i += 4) {
      encoded1 = lookup[base64.charCodeAt(i)];
      encoded2 = lookup[base64.charCodeAt(i + 1)];
      encoded3 = lookup[base64.charCodeAt(i + 2)];
      encoded4 = lookup[base64.charCodeAt(i + 3)];
      bytes[p++] = encoded1 << 2 | encoded2 >> 4;
      bytes[p++] = (encoded2 & 15) << 4 | encoded3 >> 2;
      bytes[p++] = (encoded3 & 3) << 6 | encoded4 & 63;
    }
    return arraybuffer;
  };

  var withNativeArrayBuffer = typeof ArrayBuffer === "function";
  var decodePacket = function decodePacket(encodedPacket, binaryType) {
    if (typeof encodedPacket !== "string") {
      return {
        type: "message",
        data: mapBinary(encodedPacket, binaryType)
      };
    }
    var type = encodedPacket.charAt(0);
    if (type === "b") {
      return {
        type: "message",
        data: decodeBase64Packet(encodedPacket.substring(1), binaryType)
      };
    }
    var packetType = PACKET_TYPES_REVERSE[type];
    if (!packetType) {
      return ERROR_PACKET;
    }
    return encodedPacket.length > 1 ? {
      type: PACKET_TYPES_REVERSE[type],
      data: encodedPacket.substring(1)
    } : {
      type: PACKET_TYPES_REVERSE[type]
    };
  };
  var decodeBase64Packet = function decodeBase64Packet(data, binaryType) {
    if (withNativeArrayBuffer) {
      var decoded = decode$1(data);
      return mapBinary(decoded, binaryType);
    } else {
      return {
        base64: true,
        data: data
      }; // fallback for old browsers
    }
  };

  var mapBinary = function mapBinary(data, binaryType) {
    switch (binaryType) {
      case "blob":
        if (data instanceof Blob) {
          // from WebSocket + binaryType "blob"
          return data;
        } else {
          // from HTTP long-polling or WebTransport
          return new Blob([data]);
        }
      case "arraybuffer":
      default:
        if (data instanceof ArrayBuffer) {
          // from HTTP long-polling (base64) or WebSocket + binaryType "arraybuffer"
          return data;
        } else {
          // from WebTransport (Uint8Array)
          return data.buffer;
        }
    }
  };

  var SEPARATOR = String.fromCharCode(30); // see https://en.wikipedia.org/wiki/Delimiter#ASCII_delimited_text
  var encodePayload = function encodePayload(packets, callback) {
    // some packets may be added to the array while encoding, so the initial length must be saved
    var length = packets.length;
    var encodedPackets = new Array(length);
    var count = 0;
    packets.forEach(function (packet, i) {
      // force base64 encoding for binary packets
      encodePacket(packet, false, function (encodedPacket) {
        encodedPackets[i] = encodedPacket;
        if (++count === length) {
          callback(encodedPackets.join(SEPARATOR));
        }
      });
    });
  };
  var decodePayload = function decodePayload(encodedPayload, binaryType) {
    var encodedPackets = encodedPayload.split(SEPARATOR);
    var packets = [];
    for (var i = 0; i < encodedPackets.length; i++) {
      var decodedPacket = decodePacket(encodedPackets[i], binaryType);
      packets.push(decodedPacket);
      if (decodedPacket.type === "error") {
        break;
      }
    }
    return packets;
  };
  var TEXT_DECODER;
  function decodePacketFromBinary(data, isBinary, binaryType) {
    if (!TEXT_DECODER) {
      // lazily created for compatibility with old browser platforms
      TEXT_DECODER = new TextDecoder();
    }
    // 48 === "0".charCodeAt(0) (OPEN packet type)
    // 54 === "6".charCodeAt(0) (NOOP packet type)
    var isPlainBinary = isBinary || data[0] < 48 || data[0] > 54;
    return decodePacket(isPlainBinary ? data : TEXT_DECODER.decode(data), binaryType);
  }
  var protocol = 4;

  /**
   * Initialize a new `Emitter`.
   *
   * @api public
   */

  function Emitter(obj) {
    if (obj) return mixin(obj);
  }

  /**
   * Mixin the emitter properties.
   *
   * @param {Object} obj
   * @return {Object}
   * @api private
   */

  function mixin(obj) {
    for (var key in Emitter.prototype) {
      obj[key] = Emitter.prototype[key];
    }
    return obj;
  }

  /**
   * Listen on the given `event` with `fn`.
   *
   * @param {String} event
   * @param {Function} fn
   * @return {Emitter}
   * @api public
   */

  Emitter.prototype.on = Emitter.prototype.addEventListener = function (event, fn) {
    this._callbacks = this._callbacks || {};
    (this._callbacks['$' + event] = this._callbacks['$' + event] || []).push(fn);
    return this;
  };

  /**
   * Adds an `event` listener that will be invoked a single
   * time then automatically removed.
   *
   * @param {String} event
   * @param {Function} fn
   * @return {Emitter}
   * @api public
   */

  Emitter.prototype.once = function (event, fn) {
    function on() {
      this.off(event, on);
      fn.apply(this, arguments);
    }
    on.fn = fn;
    this.on(event, on);
    return this;
  };

  /**
   * Remove the given callback for `event` or all
   * registered callbacks.
   *
   * @param {String} event
   * @param {Function} fn
   * @return {Emitter}
   * @api public
   */

  Emitter.prototype.off = Emitter.prototype.removeListener = Emitter.prototype.removeAllListeners = Emitter.prototype.removeEventListener = function (event, fn) {
    this._callbacks = this._callbacks || {};

    // all
    if (0 == arguments.length) {
      this._callbacks = {};
      return this;
    }

    // specific event
    var callbacks = this._callbacks['$' + event];
    if (!callbacks) return this;

    // remove all handlers
    if (1 == arguments.length) {
      delete this._callbacks['$' + event];
      return this;
    }

    // remove specific handler
    var cb;
    for (var i = 0; i < callbacks.length; i++) {
      cb = callbacks[i];
      if (cb === fn || cb.fn === fn) {
        callbacks.splice(i, 1);
        break;
      }
    }

    // Remove event specific arrays for event types that no
    // one is subscribed for to avoid memory leak.
    if (callbacks.length === 0) {
      delete this._callbacks['$' + event];
    }
    return this;
  };

  /**
   * Emit `event` with the given args.
   *
   * @param {String} event
   * @param {Mixed} ...
   * @return {Emitter}
   */

  Emitter.prototype.emit = function (event) {
    this._callbacks = this._callbacks || {};
    var args = new Array(arguments.length - 1),
      callbacks = this._callbacks['$' + event];
    for (var i = 1; i < arguments.length; i++) {
      args[i - 1] = arguments[i];
    }
    if (callbacks) {
      callbacks = callbacks.slice(0);
      for (var i = 0, len = callbacks.length; i < len; ++i) {
        callbacks[i].apply(this, args);
      }
    }
    return this;
  };

  // alias used for reserved events (protected method)
  Emitter.prototype.emitReserved = Emitter.prototype.emit;

  /**
   * Return array of callbacks for `event`.
   *
   * @param {String} event
   * @return {Array}
   * @api public
   */

  Emitter.prototype.listeners = function (event) {
    this._callbacks = this._callbacks || {};
    return this._callbacks['$' + event] || [];
  };

  /**
   * Check if this emitter has `event` handlers.
   *
   * @param {String} event
   * @return {Boolean}
   * @api public
   */

  Emitter.prototype.hasListeners = function (event) {
    return !!this.listeners(event).length;
  };

  var globalThisShim = function () {
    if (typeof self !== "undefined") {
      return self;
    } else if (typeof window !== "undefined") {
      return window;
    } else {
      return Function("return this")();
    }
  }();

  function pick(obj) {
    for (var _len = arguments.length, attr = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
      attr[_key - 1] = arguments[_key];
    }
    return attr.reduce(function (acc, k) {
      if (obj.hasOwnProperty(k)) {
        acc[k] = obj[k];
      }
      return acc;
    }, {});
  }
  // Keep a reference to the real timeout functions so they can be used when overridden
  var NATIVE_SET_TIMEOUT = globalThisShim.setTimeout;
  var NATIVE_CLEAR_TIMEOUT = globalThisShim.clearTimeout;
  function installTimerFunctions(obj, opts) {
    if (opts.useNativeTimers) {
      obj.setTimeoutFn = NATIVE_SET_TIMEOUT.bind(globalThisShim);
      obj.clearTimeoutFn = NATIVE_CLEAR_TIMEOUT.bind(globalThisShim);
    } else {
      obj.setTimeoutFn = globalThisShim.setTimeout.bind(globalThisShim);
      obj.clearTimeoutFn = globalThisShim.clearTimeout.bind(globalThisShim);
    }
  }
  // base64 encoded buffers are about 33% bigger (https://en.wikipedia.org/wiki/Base64)
  var BASE64_OVERHEAD = 1.33;
  // we could also have used `new Blob([obj]).size`, but it isn't supported in IE9
  function byteLength(obj) {
    if (typeof obj === "string") {
      return utf8Length(obj);
    }
    // arraybuffer or blob
    return Math.ceil((obj.byteLength || obj.size) * BASE64_OVERHEAD);
  }
  function utf8Length(str) {
    var c = 0,
      length = 0;
    for (var i = 0, l = str.length; i < l; i++) {
      c = str.charCodeAt(i);
      if (c < 0x80) {
        length += 1;
      } else if (c < 0x800) {
        length += 2;
      } else if (c < 0xd800 || c >= 0xe000) {
        length += 3;
      } else {
        i++;
        length += 4;
      }
    }
    return length;
  }

  // imported from https://github.com/galkn/querystring
  /**
   * Compiles a querystring
   * Returns string representation of the object
   *
   * @param {Object}
   * @api private
   */
  function encode$1(obj) {
    var str = '';
    for (var i in obj) {
      if (obj.hasOwnProperty(i)) {
        if (str.length) str += '&';
        str += encodeURIComponent(i) + '=' + encodeURIComponent(obj[i]);
      }
    }
    return str;
  }
  /**
   * Parses a simple querystring into an object
   *
   * @param {String} qs
   * @api private
   */
  function decode(qs) {
    var qry = {};
    var pairs = qs.split('&');
    for (var i = 0, l = pairs.length; i < l; i++) {
      var pair = pairs[i].split('=');
      qry[decodeURIComponent(pair[0])] = decodeURIComponent(pair[1]);
    }
    return qry;
  }

  var TransportError = /*#__PURE__*/function (_Error) {
    _inherits(TransportError, _Error);
    var _super = _createSuper(TransportError);
    function TransportError(reason, description, context) {
      var _this;
      _classCallCheck(this, TransportError);
      _this = _super.call(this, reason);
      _this.description = description;
      _this.context = context;
      _this.type = "TransportError";
      return _this;
    }
    return _createClass(TransportError);
  }( /*#__PURE__*/_wrapNativeSuper(Error));
  var Transport = /*#__PURE__*/function (_Emitter) {
    _inherits(Transport, _Emitter);
    var _super2 = _createSuper(Transport);
    /**
     * Transport abstract constructor.
     *
     * @param {Object} opts - options
     * @protected
     */
    function Transport(opts) {
      var _this2;
      _classCallCheck(this, Transport);
      _this2 = _super2.call(this);
      _this2.writable = false;
      installTimerFunctions(_assertThisInitialized(_this2), opts);
      _this2.opts = opts;
      _this2.query = opts.query;
      _this2.socket = opts.socket;
      return _this2;
    }
    /**
     * Emits an error.
     *
     * @param {String} reason
     * @param description
     * @param context - the error context
     * @return {Transport} for chaining
     * @protected
     */
    _createClass(Transport, [{
      key: "onError",
      value: function onError(reason, description, context) {
        _get(_getPrototypeOf(Transport.prototype), "emitReserved", this).call(this, "error", new TransportError(reason, description, context));
        return this;
      }
      /**
       * Opens the transport.
       */
    }, {
      key: "open",
      value: function open() {
        this.readyState = "opening";
        this.doOpen();
        return this;
      }
      /**
       * Closes the transport.
       */
    }, {
      key: "close",
      value: function close() {
        if (this.readyState === "opening" || this.readyState === "open") {
          this.doClose();
          this.onClose();
        }
        return this;
      }
      /**
       * Sends multiple packets.
       *
       * @param {Array} packets
       */
    }, {
      key: "send",
      value: function send(packets) {
        if (this.readyState === "open") {
          this.write(packets);
        }
      }
      /**
       * Called upon open
       *
       * @protected
       */
    }, {
      key: "onOpen",
      value: function onOpen() {
        this.readyState = "open";
        this.writable = true;
        _get(_getPrototypeOf(Transport.prototype), "emitReserved", this).call(this, "open");
      }
      /**
       * Called with data.
       *
       * @param {String} data
       * @protected
       */
    }, {
      key: "onData",
      value: function onData(data) {
        var packet = decodePacket(data, this.socket.binaryType);
        this.onPacket(packet);
      }
      /**
       * Called with a decoded packet.
       *
       * @protected
       */
    }, {
      key: "onPacket",
      value: function onPacket(packet) {
        _get(_getPrototypeOf(Transport.prototype), "emitReserved", this).call(this, "packet", packet);
      }
      /**
       * Called upon close.
       *
       * @protected
       */
    }, {
      key: "onClose",
      value: function onClose(details) {
        this.readyState = "closed";
        _get(_getPrototypeOf(Transport.prototype), "emitReserved", this).call(this, "close", details);
      }
      /**
       * Pauses the transport, in order not to lose packets during an upgrade.
       *
       * @param onPause
       */
    }, {
      key: "pause",
      value: function pause(onPause) {}
    }, {
      key: "createUri",
      value: function createUri(schema) {
        var query = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
        return schema + "://" + this._hostname() + this._port() + this.opts.path + this._query(query);
      }
    }, {
      key: "_hostname",
      value: function _hostname() {
        var hostname = this.opts.hostname;
        return hostname.indexOf(":") === -1 ? hostname : "[" + hostname + "]";
      }
    }, {
      key: "_port",
      value: function _port() {
        if (this.opts.port && (this.opts.secure && Number(this.opts.port !== 443) || !this.opts.secure && Number(this.opts.port) !== 80)) {
          return ":" + this.opts.port;
        } else {
          return "";
        }
      }
    }, {
      key: "_query",
      value: function _query(query) {
        var encodedQuery = encode$1(query);
        return encodedQuery.length ? "?" + encodedQuery : "";
      }
    }]);
    return Transport;
  }(Emitter);

  // imported from https://github.com/unshiftio/yeast

  var alphabet = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-_'.split(''),
    length = 64,
    map = {};
  var seed = 0,
    i = 0,
    prev;
  /**
   * Return a string representing the specified number.
   *
   * @param {Number} num The number to convert.
   * @returns {String} The string representation of the number.
   * @api public
   */
  function encode(num) {
    var encoded = '';
    do {
      encoded = alphabet[num % length] + encoded;
      num = Math.floor(num / length);
    } while (num > 0);
    return encoded;
  }
  /**
   * Yeast: A tiny growing id generator.
   *
   * @returns {String} A unique id.
   * @api public
   */
  function yeast() {
    var now = encode(+new Date());
    if (now !== prev) return seed = 0, prev = now;
    return now + '.' + encode(seed++);
  }
  //
  // Map each character to its index.
  //
  for (; i < length; i++) map[alphabet[i]] = i;

  // imported from https://github.com/component/has-cors
  var value = false;
  try {
    value = typeof XMLHttpRequest !== 'undefined' && 'withCredentials' in new XMLHttpRequest();
  } catch (err) {
    // if XMLHttp support is disabled in IE then it will throw
    // when trying to create
  }
  var hasCORS = value;

  // browser shim for xmlhttprequest module
  function XHR(opts) {
    var xdomain = opts.xdomain;
    // XMLHttpRequest can be disabled on IE
    try {
      if ("undefined" !== typeof XMLHttpRequest && (!xdomain || hasCORS)) {
        return new XMLHttpRequest();
      }
    } catch (e) {}
    if (!xdomain) {
      try {
        return new globalThisShim[["Active"].concat("Object").join("X")]("Microsoft.XMLHTTP");
      } catch (e) {}
    }
  }
  function createCookieJar() {}

  function empty() {}
  var hasXHR2 = function () {
    var xhr = new XHR({
      xdomain: false
    });
    return null != xhr.responseType;
  }();
  var Polling = /*#__PURE__*/function (_Transport) {
    _inherits(Polling, _Transport);
    var _super = _createSuper(Polling);
    /**
     * XHR Polling constructor.
     *
     * @param {Object} opts
     * @package
     */
    function Polling(opts) {
      var _this;
      _classCallCheck(this, Polling);
      _this = _super.call(this, opts);
      _this.polling = false;
      if (typeof location !== "undefined") {
        var isSSL = "https:" === location.protocol;
        var port = location.port;
        // some user agents have empty `location.port`
        if (!port) {
          port = isSSL ? "443" : "80";
        }
        _this.xd = typeof location !== "undefined" && opts.hostname !== location.hostname || port !== opts.port;
      }
      /**
       * XHR supports binary
       */
      var forceBase64 = opts && opts.forceBase64;
      _this.supportsBinary = hasXHR2 && !forceBase64;
      if (_this.opts.withCredentials) {
        _this.cookieJar = createCookieJar();
      }
      return _this;
    }
    _createClass(Polling, [{
      key: "name",
      get: function get() {
        return "polling";
      }
      /**
       * Opens the socket (triggers polling). We write a PING message to determine
       * when the transport is open.
       *
       * @protected
       */
    }, {
      key: "doOpen",
      value: function doOpen() {
        this.poll();
      }
      /**
       * Pauses polling.
       *
       * @param {Function} onPause - callback upon buffers are flushed and transport is paused
       * @package
       */
    }, {
      key: "pause",
      value: function pause(onPause) {
        var _this2 = this;
        this.readyState = "pausing";
        var pause = function pause() {
          _this2.readyState = "paused";
          onPause();
        };
        if (this.polling || !this.writable) {
          var total = 0;
          if (this.polling) {
            total++;
            this.once("pollComplete", function () {
              --total || pause();
            });
          }
          if (!this.writable) {
            total++;
            this.once("drain", function () {
              --total || pause();
            });
          }
        } else {
          pause();
        }
      }
      /**
       * Starts polling cycle.
       *
       * @private
       */
    }, {
      key: "poll",
      value: function poll() {
        this.polling = true;
        this.doPoll();
        this.emitReserved("poll");
      }
      /**
       * Overloads onData to detect payloads.
       *
       * @protected
       */
    }, {
      key: "onData",
      value: function onData(data) {
        var _this3 = this;
        var callback = function callback(packet) {
          // if its the first message we consider the transport open
          if ("opening" === _this3.readyState && packet.type === "open") {
            _this3.onOpen();
          }
          // if its a close packet, we close the ongoing requests
          if ("close" === packet.type) {
            _this3.onClose({
              description: "transport closed by the server"
            });
            return false;
          }
          // otherwise bypass onData and handle the message
          _this3.onPacket(packet);
        };
        // decode payload
        decodePayload(data, this.socket.binaryType).forEach(callback);
        // if an event did not trigger closing
        if ("closed" !== this.readyState) {
          // if we got data we're not polling
          this.polling = false;
          this.emitReserved("pollComplete");
          if ("open" === this.readyState) {
            this.poll();
          }
        }
      }
      /**
       * For polling, send a close packet.
       *
       * @protected
       */
    }, {
      key: "doClose",
      value: function doClose() {
        var _this4 = this;
        var close = function close() {
          _this4.write([{
            type: "close"
          }]);
        };
        if ("open" === this.readyState) {
          close();
        } else {
          // in case we're trying to close while
          // handshaking is in progress (GH-164)
          this.once("open", close);
        }
      }
      /**
       * Writes a packets payload.
       *
       * @param {Array} packets - data packets
       * @protected
       */
    }, {
      key: "write",
      value: function write(packets) {
        var _this5 = this;
        this.writable = false;
        encodePayload(packets, function (data) {
          _this5.doWrite(data, function () {
            _this5.writable = true;
            _this5.emitReserved("drain");
          });
        });
      }
      /**
       * Generates uri for connection.
       *
       * @private
       */
    }, {
      key: "uri",
      value: function uri() {
        var schema = this.opts.secure ? "https" : "http";
        var query = this.query || {};
        // cache busting is forced
        if (false !== this.opts.timestampRequests) {
          query[this.opts.timestampParam] = yeast();
        }
        if (!this.supportsBinary && !query.sid) {
          query.b64 = 1;
        }
        return this.createUri(schema, query);
      }
      /**
       * Creates a request.
       *
       * @param {String} method
       * @private
       */
    }, {
      key: "request",
      value: function request() {
        var opts = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
        _extends(opts, {
          xd: this.xd,
          cookieJar: this.cookieJar
        }, this.opts);
        return new Request(this.uri(), opts);
      }
      /**
       * Sends data.
       *
       * @param {String} data to send.
       * @param {Function} called upon flush.
       * @private
       */
    }, {
      key: "doWrite",
      value: function doWrite(data, fn) {
        var _this6 = this;
        var req = this.request({
          method: "POST",
          data: data
        });
        req.on("success", fn);
        req.on("error", function (xhrStatus, context) {
          _this6.onError("xhr post error", xhrStatus, context);
        });
      }
      /**
       * Starts a poll cycle.
       *
       * @private
       */
    }, {
      key: "doPoll",
      value: function doPoll() {
        var _this7 = this;
        var req = this.request();
        req.on("data", this.onData.bind(this));
        req.on("error", function (xhrStatus, context) {
          _this7.onError("xhr poll error", xhrStatus, context);
        });
        this.pollXhr = req;
      }
    }]);
    return Polling;
  }(Transport);
  var Request = /*#__PURE__*/function (_Emitter) {
    _inherits(Request, _Emitter);
    var _super2 = _createSuper(Request);
    /**
     * Request constructor
     *
     * @param {Object} options
     * @package
     */
    function Request(uri, opts) {
      var _this8;
      _classCallCheck(this, Request);
      _this8 = _super2.call(this);
      installTimerFunctions(_assertThisInitialized(_this8), opts);
      _this8.opts = opts;
      _this8.method = opts.method || "GET";
      _this8.uri = uri;
      _this8.data = undefined !== opts.data ? opts.data : null;
      _this8.create();
      return _this8;
    }
    /**
     * Creates the XHR object and sends the request.
     *
     * @private
     */
    _createClass(Request, [{
      key: "create",
      value: function create() {
        var _this9 = this;
        var _a;
        var opts = pick(this.opts, "agent", "pfx", "key", "passphrase", "cert", "ca", "ciphers", "rejectUnauthorized", "autoUnref");
        opts.xdomain = !!this.opts.xd;
        var xhr = this.xhr = new XHR(opts);
        try {
          xhr.open(this.method, this.uri, true);
          try {
            if (this.opts.extraHeaders) {
              xhr.setDisableHeaderCheck && xhr.setDisableHeaderCheck(true);
              for (var i in this.opts.extraHeaders) {
                if (this.opts.extraHeaders.hasOwnProperty(i)) {
                  xhr.setRequestHeader(i, this.opts.extraHeaders[i]);
                }
              }
            }
          } catch (e) {}
          if ("POST" === this.method) {
            try {
              xhr.setRequestHeader("Content-type", "text/plain;charset=UTF-8");
            } catch (e) {}
          }
          try {
            xhr.setRequestHeader("Accept", "*/*");
          } catch (e) {}
          (_a = this.opts.cookieJar) === null || _a === void 0 ? void 0 : _a.addCookies(xhr);
          // ie6 check
          if ("withCredentials" in xhr) {
            xhr.withCredentials = this.opts.withCredentials;
          }
          if (this.opts.requestTimeout) {
            xhr.timeout = this.opts.requestTimeout;
          }
          xhr.onreadystatechange = function () {
            var _a;
            if (xhr.readyState === 3) {
              (_a = _this9.opts.cookieJar) === null || _a === void 0 ? void 0 : _a.parseCookies(xhr);
            }
            if (4 !== xhr.readyState) return;
            if (200 === xhr.status || 1223 === xhr.status) {
              _this9.onLoad();
            } else {
              // make sure the `error` event handler that's user-set
              // does not throw in the same tick and gets caught here
              _this9.setTimeoutFn(function () {
                _this9.onError(typeof xhr.status === "number" ? xhr.status : 0);
              }, 0);
            }
          };
          xhr.send(this.data);
        } catch (e) {
          // Need to defer since .create() is called directly from the constructor
          // and thus the 'error' event can only be only bound *after* this exception
          // occurs.  Therefore, also, we cannot throw here at all.
          this.setTimeoutFn(function () {
            _this9.onError(e);
          }, 0);
          return;
        }
        if (typeof document !== "undefined") {
          this.index = Request.requestsCount++;
          Request.requests[this.index] = this;
        }
      }
      /**
       * Called upon error.
       *
       * @private
       */
    }, {
      key: "onError",
      value: function onError(err) {
        this.emitReserved("error", err, this.xhr);
        this.cleanup(true);
      }
      /**
       * Cleans up house.
       *
       * @private
       */
    }, {
      key: "cleanup",
      value: function cleanup(fromError) {
        if ("undefined" === typeof this.xhr || null === this.xhr) {
          return;
        }
        this.xhr.onreadystatechange = empty;
        if (fromError) {
          try {
            this.xhr.abort();
          } catch (e) {}
        }
        if (typeof document !== "undefined") {
          delete Request.requests[this.index];
        }
        this.xhr = null;
      }
      /**
       * Called upon load.
       *
       * @private
       */
    }, {
      key: "onLoad",
      value: function onLoad() {
        var data = this.xhr.responseText;
        if (data !== null) {
          this.emitReserved("data", data);
          this.emitReserved("success");
          this.cleanup();
        }
      }
      /**
       * Aborts the request.
       *
       * @package
       */
    }, {
      key: "abort",
      value: function abort() {
        this.cleanup();
      }
    }]);
    return Request;
  }(Emitter);
  Request.requestsCount = 0;
  Request.requests = {};
  /**
   * 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.
   */
  if (typeof document !== "undefined") {
    // @ts-ignore
    if (typeof attachEvent === "function") {
      // @ts-ignore
      attachEvent("onunload", unloadHandler);
    } else if (typeof addEventListener === "function") {
      var terminationEvent = "onpagehide" in globalThisShim ? "pagehide" : "unload";
      addEventListener(terminationEvent, unloadHandler, false);
    }
  }
  function unloadHandler() {
    for (var i in Request.requests) {
      if (Request.requests.hasOwnProperty(i)) {
        Request.requests[i].abort();
      }
    }
  }

  var nextTick = function () {
    var isPromiseAvailable = typeof Promise === "function" && typeof Promise.resolve === "function";
    if (isPromiseAvailable) {
      return function (cb) {
        return Promise.resolve().then(cb);
      };
    } else {
      return function (cb, setTimeoutFn) {
        return setTimeoutFn(cb, 0);
      };
    }
  }();
  var WebSocket = globalThisShim.WebSocket || globalThisShim.MozWebSocket;
  var usingBrowserWebSocket = true;
  var defaultBinaryType = "arraybuffer";

  // detect ReactNative environment
  var isReactNative = typeof navigator !== "undefined" && typeof navigator.product === "string" && navigator.product.toLowerCase() === "reactnative";
  var WS = /*#__PURE__*/function (_Transport) {
    _inherits(WS, _Transport);
    var _super = _createSuper(WS);
    /**
     * WebSocket transport constructor.
     *
     * @param {Object} opts - connection options
     * @protected
     */
    function WS(opts) {
      var _this;
      _classCallCheck(this, WS);
      _this = _super.call(this, opts);
      _this.supportsBinary = !opts.forceBase64;
      return _this;
    }
    _createClass(WS, [{
      key: "name",
      get: function get() {
        return "websocket";
      }
    }, {
      key: "doOpen",
      value: function doOpen() {
        if (!this.check()) {
          // let probe timeout
          return;
        }
        var uri = this.uri();
        var protocols = this.opts.protocols;
        // React Native only supports the 'headers' option, and will print a warning if anything else is passed
        var opts = isReactNative ? {} : pick(this.opts, "agent", "perMessageDeflate", "pfx", "key", "passphrase", "cert", "ca", "ciphers", "rejectUnauthorized", "localAddress", "protocolVersion", "origin", "maxPayload", "family", "checkServerIdentity");
        if (this.opts.extraHeaders) {
          opts.headers = this.opts.extraHeaders;
        }
        try {
          this.ws = usingBrowserWebSocket && !isReactNative ? protocols ? new WebSocket(uri, protocols) : new WebSocket(uri) : new WebSocket(uri, protocols, opts);
        } catch (err) {
          return this.emitReserved("error", err);
        }
        this.ws.binaryType = this.socket.binaryType || defaultBinaryType;
        this.addEventListeners();
      }
      /**
       * Adds event listeners to the socket
       *
       * @private
       */
    }, {
      key: "addEventListeners",
      value: function addEventListeners() {
        var _this2 = this;
        this.ws.onopen = function () {
          if (_this2.opts.autoUnref) {
            _this2.ws._socket.unref();
          }
          _this2.onOpen();
        };
        this.ws.onclose = function (closeEvent) {
          return _this2.onClose({
            description: "websocket connection closed",
            context: closeEvent
          });
        };
        this.ws.onmessage = function (ev) {
          return _this2.onData(ev.data);
        };
        this.ws.onerror = function (e) {
          return _this2.onError("websocket error", e);
        };
      }
    }, {
      key: "write",
      value: function write(packets) {
        var _this3 = this;
        this.writable = false;
        // encodePacket efficient as it uses WS framing
        // no need for encodePayload
        var _loop = function _loop() {
          var packet = packets[i];
          var lastPacket = i === packets.length - 1;
          encodePacket(packet, _this3.supportsBinary, function (data) {
            // always create a new object (GH-437)
            var opts = {};
            // Sometimes the websocket has already been closed but the browser didn't
            // have a chance of informing us about it yet, in that case send will
            // throw an error
            try {
              if (usingBrowserWebSocket) {
                // TypeError is thrown when passing the second argument on Safari
                _this3.ws.send(data);
              }
            } catch (e) {}
            if (lastPacket) {
              // fake drain
              // defer to next tick to allow Socket to clear writeBuffer
              nextTick(function () {
                _this3.writable = true;
                _this3.emitReserved("drain");
              }, _this3.setTimeoutFn);
            }
          });
        };
        for (var i = 0; i < packets.length; i++) {
          _loop();
        }
      }
    }, {
      key: "doClose",
      value: function doClose() {
        if (typeof this.ws !== "undefined") {
          this.ws.close();
          this.ws = null;
        }
      }
      /**
       * Generates uri for connection.
       *
       * @private
       */
    }, {
      key: "uri",
      value: function uri() {
        var schema = this.opts.secure ? "wss" : "ws";
        var query = this.query || {};
        // append timestamp to URI
        if (this.opts.timestampRequests) {
          query[this.opts.timestampParam] = yeast();
        }
        // communicate binary support capabilities
        if (!this.supportsBinary) {
          query.b64 = 1;
        }
        return this.createUri(schema, query);
      }
      /**
       * Feature detection for WebSocket.
       *
       * @return {Boolean} whether this transport is available.
       * @private
       */
    }, {
      key: "check",
      value: function check() {
        return !!WebSocket;
      }
    }]);
    return WS;
  }(Transport);

  function shouldIncludeBinaryHeader(packet, encoded) {
    // 48 === "0".charCodeAt(0) (OPEN packet type)
    // 54 === "6".charCodeAt(0) (NOOP packet type)
    return packet.type === "message" && typeof packet.data !== "string" && encoded[0] >= 48 && encoded[0] <= 54;
  }
  var WT = /*#__PURE__*/function (_Transport) {
    _inherits(WT, _Transport);
    var _super = _createSuper(WT);
    function WT() {
      _classCallCheck(this, WT);
      return _super.apply(this, arguments);
    }
    _createClass(WT, [{
      key: "name",
      get: function get() {
        return "webtransport";
      }
    }, {
      key: "doOpen",
      value: function doOpen() {
        var _this = this;
        // @ts-ignore
        if (typeof WebTransport !== "function") {
          return;
        }
        // @ts-ignore
        this.transport = new WebTransport(this.createUri("https"), this.opts.transportOptions[this.name]);
        this.transport.closed.then(function () {
          _this.onClose();
        })["catch"](function (err) {
          _this.onError("webtransport error", err);
        });
        // note: we could have used async/await, but that would require some additional polyfills
        this.transport.ready.then(function () {
          _this.transport.createBidirectionalStream().then(function (stream) {
            var reader = stream.readable.getReader();
            _this.writer = stream.writable.getWriter();
            var binaryFlag;
            var read = function read() {
              reader.read().then(function (_ref) {
                var done = _ref.done,
                  value = _ref.value;
                if (done) {
                  return;
                }
                if (!binaryFlag && value.byteLength === 1 && value[0] === 54) {
                  binaryFlag = true;
                } else {
                  // TODO expose binarytype
                  _this.onPacket(decodePacketFromBinary(value, binaryFlag, "arraybuffer"));
                  binaryFlag = false;
                }
                read();
              })["catch"](function (err) {});
            };
            read();
            var handshake = _this.query.sid ? "0{\"sid\":\"".concat(_this.query.sid, "\"}") : "0";
            _this.writer.write(new TextEncoder().encode(handshake)).then(function () {
              return _this.onOpen();
            });
          });
        });
      }
    }, {
      key: "write",
      value: function write(packets) {
        var _this2 = this;
        this.writable = false;
        var _loop = function _loop() {
          var packet = packets[i];
          var lastPacket = i === packets.length - 1;
          encodePacketToBinary(packet, function (data) {
            if (shouldIncludeBinaryHeader(packet, data)) {
              _this2.writer.write(Uint8Array.of(54));
            }
            _this2.writer.write(data).then(function () {
              if (lastPacket) {
                nextTick(function () {
                  _this2.writable = true;
                  _this2.emitReserved("drain");
                }, _this2.setTimeoutFn);
              }
            });
          });
        };
        for (var i = 0; i < packets.length; i++) {
          _loop();
        }
      }
    }, {
      key: "doClose",
      value: function doClose() {
        var _a;
        (_a = this.transport) === null || _a === void 0 ? void 0 : _a.close();
      }
    }]);
    return WT;
  }(Transport);

  var transports = {
    websocket: WS,
    webtransport: WT,
    polling: Polling
  };

  // imported from https://github.com/galkn/parseuri
  /**
   * Parses a URI
   *
   * Note: we could also have used the built-in URL object, but it isn't supported on all platforms.
   *
   * See:
   * - https://developer.mozilla.org/en-US/docs/Web/API/URL
   * - https://caniuse.com/url
   * - https://www.rfc-editor.org/rfc/rfc3986#appendix-B
   *
   * History of the parse() method:
   * - first commit: https://github.com/socketio/socket.io-client/commit/4ee1d5d94b3906a9c052b459f1a818b15f38f91c
   * - export into its own module: https://github.com/socketio/engine.io-client/commit/de2c561e4564efeb78f1bdb1ba39ef81b2822cb3
   * - reimport: https://github.com/socketio/engine.io-client/commit/df32277c3f6d622eec5ed09f493cae3f3391d242
   *
   * @author Steven Levithan <stevenlevithan.com> (MIT license)
   * @api private
   */
  var re = /^(?:(?![^:@\/?#]+:[^:@\/]*@)(http|https|ws|wss):\/\/)?((?:(([^:@\/?#]*)(?::([^:@\/?#]*))?)?@)?((?:[a-f0-9]{0,4}:){2,7}[a-f0-9]{0,4}|[^:\/?#]*)(?::(\d*))?)(((\/(?:[^?#](?![^?#\/]*\.[^?#\/.]+(?:[?#]|$)))*\/?)?([^?#\/]*))(?:\?([^#]*))?(?:#(.*))?)/;
  var parts = ['source', 'protocol', 'authority', 'userInfo', 'user', 'password', 'host', 'port', 'relative', 'path', 'directory', 'file', 'query', 'anchor'];
  function parse(str) {
    var src = str,
      b = str.indexOf('['),
      e = str.indexOf(']');
    if (b != -1 && e != -1) {
      str = str.substring(0, b) + str.substring(b, e).replace(/:/g, ';') + str.substring(e, str.length);
    }
    var m = re.exec(str || ''),
      uri = {},
      i = 14;
    while (i--) {
      uri[parts[i]] = m[i] || '';
    }
    if (b != -1 && e != -1) {
      uri.source = src;
      uri.host = uri.host.substring(1, uri.host.length - 1).replace(/;/g, ':');
      uri.authority = uri.authority.replace('[', '').replace(']', '').replace(/;/g, ':');
      uri.ipv6uri = true;
    }
    uri.pathNames = pathNames(uri, uri['path']);
    uri.queryKey = queryKey(uri, uri['query']);
    return uri;
  }
  function pathNames(obj, path) {
    var regx = /\/{2,9}/g,
      names = path.replace(regx, "/").split("/");
    if (path.slice(0, 1) == '/' || path.length === 0) {
      names.splice(0, 1);
    }
    if (path.slice(-1) == '/') {
      names.splice(names.length - 1, 1);
    }
    return names;
  }
  function queryKey(uri, query) {
    var data = {};
    query.replace(/(?:^|&)([^&=]*)=?([^&]*)/g, function ($0, $1, $2) {
      if ($1) {
        data[$1] = $2;
      }
    });
    return data;
  }

  var Socket = /*#__PURE__*/function (_Emitter) {
    _inherits(Socket, _Emitter);
    var _super = _createSuper(Socket);
    /**
     * Socket constructor.
     *
     * @param {String|Object} uri - uri or options
     * @param {Object} opts - options
     */
    function Socket(uri) {
      var _this;
      var opts = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
      _classCallCheck(this, Socket);
      _this = _super.call(this);
      _this.writeBuffer = [];
      if (uri && "object" === _typeof(uri)) {
        opts = uri;
        uri = null;
      }
      if (uri) {
        uri = parse(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 = parse(opts.host).host;
      }
      installTimerFunctions(_assertThisInitialized(_this), opts);
      _this.secure = null != opts.secure ? opts.secure : typeof location !== "undefined" && "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.hostname = opts.hostname || (typeof location !== "undefined" ? location.hostname : "localhost");
      _this.port = opts.port || (typeof location !== "undefined" && location.port ? location.port : _this.secure ? "443" : "80");
      _this.transports = opts.transports || ["polling", "websocket", "webtransport"];
      _this.writeBuffer = [];
      _this.prevBufferLen = 0;
      _this.opts = _extends({
        path: "/engine.io",
        agent: false,
        withCredentials: false,
        upgrade: true,
        timestampParam: "t",
        rememberUpgrade: false,
        addTrailingSlash: true,
        rejectUnauthorized: true,
        perMessageDeflate: {
          threshold: 1024
        },
        transportOptions: {},
        closeOnBeforeunload: false
      }, opts);
      _this.opts.path = _this.opts.path.replace(/\/$/, "") + (_this.opts.addTrailingSlash ? "/" : "");
      if (typeof _this.opts.query === "string") {
        _this.opts.query = decode(_this.opts.query);
      }
      // set on handshake
      _this.id = null;
      _this.upgrades = null;
      _this.pingInterval = null;
      _this.pingTimeout = null;
      // set on heartbeat
      _this.pingTimeoutTimer = null;
      if (typeof addEventListener === "function") {
        if (_this.opts.closeOnBeforeunload) {
          // Firefox closes the connection when the "beforeunload" event is emitted but not Chrome. This event listener
          // ensures every browser behaves the same (no "disconnect" event at the Socket.IO level when the page is
          // closed/reloaded)
          _this.beforeunloadEventListener = function () {
            if (_this.transport) {
              // silently close the transport
              _this.transport.removeAllListeners();
              _this.transport.close();
            }
          };
          addEventListener("beforeunload", _this.beforeunloadEventListener, false);
        }
        if (_this.hostname !== "localhost") {
          _this.offlineEventListener = function () {
            _this.onClose("transport close", {
              description: "network connection lost"
            });
          };
          addEventListener("offline", _this.offlineEventListener, false);
        }
      }
      _this.open();
      return _this;
    }
    /**
     * Creates transport of the given type.
     *
     * @param {String} name - transport name
     * @return {Transport}
     * @private
     */
    _createClass(Socket, [{
      key: "createTransport",
      value: function createTransport(name) {
        var query = _extends({}, this.opts.query);
        // append engine.io protocol identifier
        query.EIO = protocol;
        // transport name
        query.transport = name;
        // session id if we already have one
        if (this.id) query.sid = this.id;
        var opts = _extends({}, this.opts, {
          query: query,
          socket: this,
          hostname: this.hostname,
          secure: this.secure,
          port: this.port
        }, this.opts.transportOptions[name]);
        return new transports[name](opts);
      }
      /**
       * Initializes transport to use and starts probe.
       *
       * @private
       */
    }, {
      key: "open",
      value: function open() {
        var _this2 = this;
        var transport;
        if (this.opts.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
          this.setTimeoutFn(function () {
            _this2.emitReserved("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).
       *
       * @private
       */
    }, {
      key: "setTransport",
      value: function setTransport(transport) {
        var _this3 = this;
        if (this.transport) {
          this.transport.removeAllListeners();
        }
        // set up transport
        this.transport = transport;
        // set up transport listeners
        transport.on("drain", this.onDrain.bind(this)).on("packet", this.onPacket.bind(this)).on("error", this.onError.bind(this)).on("close", function (reason) {
          return _this3.onClose("transport close", reason);
        });
      }
      /**
       * Probes a transport.
       *
       * @param {String} name - transport name
       * @private
       */
    }, {
      key: "probe",
      value: function probe(name) {
        var _this4 = this;
        var transport = this.createTransport(name);
        var failed = false;
        Socket.priorWebsocketSuccess = false;
        var onTransportOpen = function onTransportOpen() {
          if (failed) return;
          transport.send([{
            type: "ping",
            data: "probe"
          }]);
          transport.once("packet", function (msg) {
            if (failed) return;
            if ("pong" === msg.type && "probe" === msg.data) {
              _this4.upgrading = true;
              _this4.emitReserved("upgrading", transport);
              if (!transport) return;
              Socket.priorWebsocketSuccess = "websocket" === transport.name;
              _this4.transport.pause(function () {
                if (failed) return;
                if ("closed" === _this4.readyState) return;
                cleanup();
                _this4.setTransport(transport);
                transport.send([{
                  type: "upgrade"
                }]);
                _this4.emitReserved("upgrade", transport);
                transport = null;
                _this4.upgrading = false;
                _this4.flush();
              });
            } else {
              var err = new Error("probe error");
              // @ts-ignore
              err.transport = transport.name;
              _this4.emitReserved("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
        var onerror = function onerror(err) {
          var error = new Error("probe error: " + err);
          // @ts-ignore
          error.transport = transport.name;
          freezeTransport();
          _this4.emitReserved("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) {
            freezeTransport();
          }
        }
        // Remove all listeners on the transport and on self
        var cleanup = function cleanup() {
          transport.removeListener("open", onTransportOpen);
          transport.removeListener("error", onerror);
          transport.removeListener("close", onTransportClose);
          _this4.off("close", onclose);
          _this4.off("upgrading", onupgrade);
        };
        transport.once("open", onTransportOpen);
        transport.once("error", onerror);
        transport.once("close", onTransportClose);
        this.once("close", onclose);
        this.once("upgrading", onupgrade);
        if (this.upgrades.indexOf("webtransport") !== -1 && name !== "webtransport") {
          // favor WebTransport
          this.setTimeoutFn(function () {
            if (!failed) {
              transport.open();
            }
          }, 200);
        } else {
          transport.open();
        }
      }
      /**
       * Called when connection is deemed open.
       *
       * @private
       */
    }, {
      key: "onOpen",
      value: function onOpen() {
        this.readyState = "open";
        Socket.priorWebsocketSuccess = "websocket" === this.transport.name;
        this.emitReserved("open");
        this.flush();
        // we check for `readyState` in case an `open`
        // listener already closed the socket
        if ("open" === this.readyState && this.opts.upgrade) {
          var i = 0;
          var l = this.upgrades.length;
          for (; i < l; i++) {
            this.probe(this.upgrades[i]);
          }
        }
      }
      /**
       * Handles a packet.
       *
       * @private
       */
    }, {
      key: "onPacket",
      value: function onPacket(packet) {
        if ("opening" === this.readyState || "open" === this.readyState || "closing" === this.readyState) {
          this.emitReserved("packet", packet);
          // Socket is live - any packet counts
          this.emitReserved("heartbeat");
          switch (packet.type) {
            case "open":
              this.onHandshake(JSON.parse(packet.data));
              break;
            case "ping":
              this.resetPingTimeout();
              this.sendPacket("pong");
              this.emitReserved("ping");
              this.emitReserved("pong");
              break;
            case "error":
              var err = new Error("server error");
              // @ts-ignore
              err.code = packet.data;
              this.onError(err);
              break;
            case "message":
              this.emitReserved("data", packet.data);
              this.emitReserved("message", packet.data);
              break;
          }
        }
      }
      /**
       * Called upon handshake completion.
       *
       * @param {Object} data - handshake obj
       * @private
       */
    }, {
      key: "onHandshake",
      value: function onHandshake(data) {
        this.emitReserved("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.maxPayload = data.maxPayload;
        this.onOpen();
        // In case open handler closes socket
        if ("closed" === this.readyState) return;
        this.resetPingTimeout();
      }
      /**
       * Sets and resets ping timeout timer based on server pings.
       *
       * @private
       */
    }, {
      key: "resetPingTimeout",
      value: function resetPingTimeout() {
        var _this5 = this;
        this.clearTimeoutFn(this.pingTimeoutTimer);
        this.pingTimeoutTimer = this.setTimeoutFn(function () {
          _this5.onClose("ping timeout");
        }, this.pingInterval + this.pingTimeout);
        if (this.opts.autoUnref) {
          this.pingTimeoutTimer.unref();
        }
      }
      /**
       * Called on `drain` event
       *
       * @private
       */
    }, {
      key: "onDrain",
      value: function onDrain() {
        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.emitReserved("drain");
        } else {
          this.flush();
        }
      }
      /**
       * Flush write buffers.
       *
       * @private
       */
    }, {
      key: "flush",
      value: function flush() {
        if ("closed" !== this.readyState && this.transport.writable && !this.upgrading && this.writeBuffer.length) {
          var packets = this.getWritablePackets();
          this.transport.send(packets);
          // keep track of current length of writeBuffer
          // splice writeBuffer and callbackBuffer on `drain`
          this.prevBufferLen = packets.length;
          this.emitReserved("flush");
        }
      }
      /**
       * Ensure the encoded size of the writeBuffer is below the maxPayload value sent by the server (only for HTTP
       * long-polling)
       *
       * @private
       */
    }, {
      key: "getWritablePackets",
      value: function getWritablePackets() {
        var shouldCheckPayloadSize = this.maxPayload && this.transport.name === "polling" && this.writeBuffer.length > 1;
        if (!shouldCheckPayloadSize) {
          return this.writeBuffer;
        }
        var payloadSize = 1; // first packet type
        for (var i = 0; i < this.writeBuffer.length; i++) {
          var data = this.writeBuffer[i].data;
          if (data) {
            payloadSize += byteLength(data);
          }
          if (i > 0 && payloadSize > this.maxPayload) {
            return this.writeBuffer.slice(0, i);
          }
          payloadSize += 2; // separator + packet type
        }

        return this.writeBuffer;
      }
      /**
       * Sends a message.
       *
       * @param {String} msg - message.
       * @param {Object} options.
       * @param {Function} callback function.
       * @return {Socket} for chaining.
       */
    }, {
      key: "write",
      value: function write(msg, options, fn) {
        this.sendPacket("message", msg, options, fn);
        return this;
      }
    }, {
      key: "send",
      value: function send(msg, options, fn) {
        this.sendPacket("message", msg, options, fn);
        return this;
      }
      /**
       * Sends a packet.
       *
       * @param {String} type: packet type.
       * @param {String} data.
       * @param {Object} options.
       * @param {Function} fn - callback function.
       * @private
       */
    }, {
      key: "sendPacket",
      value: function sendPacket(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.emitReserved("packetCreate", packet);
        this.writeBuffer.push(packet);
        if (fn) this.once("flush", fn);
        this.flush();
      }
      /**
       * Closes the connection.
       */
    }, {
      key: "close",
      value: function close() {
        var _this6 = this;
        var close = function close() {
          _this6.onClose("forced close");
          _this6.transport.close();
        };
        var cleanupAndClose = function cleanupAndClose() {
          _this6.off("upgrade", cleanupAndClose);
          _this6.off("upgradeError", cleanupAndClose);
          close();
        };
        var waitForUpgrade = function waitForUpgrade() {
          // wait for upgrade to finish since we can't send packets while pausing a transport
          _this6.once("upgrade", cleanupAndClose);
          _this6.once("upgradeError", cleanupAndClose);
        };
        if ("opening" === this.readyState || "open" === this.readyState) {
          this.readyState = "closing";
          if (this.writeBuffer.length) {
            this.once("drain", function () {
              if (_this6.upgrading) {
                waitForUpgrade();
              } else {
                close();
              }
            });
          } else if (this.upgrading) {
            waitForUpgrade();
          } else {
            close();
          }
        }
        return this;
      }
      /**
       * Called upon transport error
       *
       * @private
       */
    }, {
      key: "onError",
      value: function onError(err) {
        Socket.priorWebsocketSuccess = false;
        this.emitReserved("error", err);
        this.onClose("transport error", err);
      }
      /**
       * Called upon transport close.
       *
       * @private
       */
    }, {
      key: "onClose",
      value: function onClose(reason, description) {
        if ("opening" === this.readyState || "open" === this.readyState || "closing" === this.readyState) {
          // clear timers
          this.clearTimeoutFn(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();
          if (typeof removeEventListener === "function") {
            removeEventListener("beforeunload", this.beforeunloadEventListener, false);
            removeEventListener("offline", this.offlineEventListener, false);
          }
          // set ready state
          this.readyState = "closed";
          // clear session id
          this.id = null;
          // emit close event
          this.emitReserved("close", reason, description);
          // clean buffers after, so users can still
          // grab the buffers on `close` event
          this.writeBuffer = [];
          this.prevBufferLen = 0;
        }
      }
      /**
       * Filters upgrades, returning only those matching client transports.
       *
       * @param {Array} upgrades - server upgrades
       * @private
       */
    }, {
      key: "filterUpgrades",
      value: function filterUpgrades(upgrades) {
        var filteredUpgrades = [];
        var i = 0;
        var j = upgrades.length;
        for (; i < j; i++) {
          if (~this.transports.indexOf(upgrades[i])) filteredUpgrades.push(upgrades[i]);
        }
        return filteredUpgrades;
      }
    }]);
    return Socket;
  }(Emitter);
  Socket.protocol = protocol;

  var browserEntrypoint = (function (uri, opts) {
    return new Socket(uri, opts);
  });

  return browserEntrypoint;

})();
return eio;
});

}
]);