flask-websocket

项目结构

web-socketio

socketio.js github下载地址

1	https://github.com/socketio/socket.io/blob/main/client-dist/socket.io.js

index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="/static/js/socketio_v4.5.1.js"></script>
</head>
<body>
</body>
<script>
    var websocket_url = 'http://' + document.domain + ':' + location.port + '/testnamespace';
    //没错是用http开头的url了，因为这个库会自动解析并帮我们创建websocket对象的
    //最后的namespace是websocket中的命名空间，后面再讲
    var socket = io.connect(websocket_url);

    //发送消息
    socket.emit('request_for_response',{'param':'value'});

    //监听回复的消息
    socket.on('response',function(data){
        if (data.code == '200'){
            alert(data.msg);
        }
        else{
            alert('ERROR:' + data.msg);
        }
    });
</script>
</html>

flask-socketio

pip 下载

1	pip install flask-socketio

app.py

from flask import Flask, render_template
from flask_socketio import SocketIO, emit
import time

app = Flask(__name__)

socketio = SocketIO()
socketio.init_app(app)


# 对app进行一些路由设置
@app.route("/")
def index():
    return render_template("index.html")


# 对socketio进行一些监听设置
@socketio.on('request_for_response', namespace='/testnamespace')
def give_response(data):
    value = data.get('param')
    print(value)

    # 进行一些对value的处理或者其他操作,在此期间可以随时会调用emit方法向前台发送消息
    emit('response', {'code': '200', 'msg': 'start to process...'})

    time.sleep(5)
    emit('response', {'code': '200', 'msg': 'processed'})


if __name__ == '__main__':
    socketio.run(app, debug=True, host='0.0.0.0', port=5000)
    # 这里就不再用app.run而用socketio.run了。socketio.run的参数和app.run也都差不多

socketio_v4.5.1.js

/*!
 * Socket.IO v4.5.1
 * (c) 2014-2022 Guillermo Rauch
 * Released under the MIT License.
 */
(function (global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
  typeof define === 'function' && define.amd ? define(factory) :
  (global = typeof globalThis !== 'undefined' ? globalThis : global || self, global.io = factory());
})(this, (function () { 'use strict';

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

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

    return _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, descriptor.key, descriptor);
    }
  }

  function _createClass(Constructor, protoProps, staticProps) {
    if (protoProps) _defineProperties(Constructor.prototype, protoProps);
    if (staticProps) _defineProperties(Constructor, staticProps);
    return Constructor;
  }

  function _extends() {
    _extends = Object.assign || 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
      }
    });
    if (superClass) _setPrototypeOf(subClass, superClass);
  }

  function _getPrototypeOf(o) {
    _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) {
      return o.__proto__ || Object.getPrototypeOf(o);
    };
    return _getPrototypeOf(o);
  }

  function _setPrototypeOf(o, p) {
    _setPrototypeOf = Object.setPrototypeOf || 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;
    } 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(target, property, receiver) {
    if (typeof Reflect !== "undefined" && Reflect.get) {
      _get = Reflect.get;
    } 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(receiver);
        }

        return desc.value;
      };
    }

    return _get(target, property, receiver || target);
  }

  function _unsupportedIterableToArray(o, minLen) {
    if (!o) return;
    if (typeof o === "string") return _arrayLikeToArray(o, minLen);
    var n = Object.prototype.toString.call(o).slice(8, -1);
    if (n === "Object" && o.constructor) n = o.constructor.name;
    if (n === "Map" || n === "Set") return Array.from(o);
    if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen);
  }

  function _arrayLikeToArray(arr, len) {
    if (len == null || len > arr.length) len = arr.length;

    for (var i = 0, arr2 = new Array(len); i < len; i++) arr2[i] = arr[i];

    return arr2;
  }

  function _createForOfIteratorHelper(o, allowArrayLike) {
    var it = typeof Symbol !== "undefined" && o[Symbol.iterator] || o["@@iterator"];

    if (!it) {
      if (Array.isArray(o) || (it = _unsupportedIterableToArray(o)) || allowArrayLike && o && typeof o.length === "number") {
        if (it) o = it;
        var i = 0;

        var F = function () {};

        return {
          s: F,
          n: function () {
            if (i >= o.length) return {
              done: true
            };
            return {
              done: false,
              value: o[i++]
            };
          },
          e: function (e) {
            throw e;
          },
          f: F
        };
      }

      throw new TypeError("Invalid attempt to iterate non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.");
    }

    var normalCompletion = true,
        didErr = false,
        err;
    return {
      s: function () {
        it = it.call(o);
      },
      n: function () {
        var step = it.next();
        normalCompletion = step.done;
        return step;
      },
      e: function (e) {
        didErr = true;
        err = e;
      },
      f: function () {
        try {
          if (!normalCompletion && it.return != null) it.return();
        } finally {
          if (didErr) throw err;
        }
      }
    };
  }

  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$1 = typeof Blob === "function" || typeof Blob !== "undefined" && Object.prototype.toString.call(Blob) === "[object BlobConstructor]";
  var withNativeArrayBuffer$2 = typeof ArrayBuffer === "function"; // ArrayBuffer.isView method is not defined in IE10

  var isView$1 = 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$1 && data instanceof Blob) {
      if (supportsBinary) {
        return callback(data);
      } else {
        return encodeBlobAsBase64(data, callback);
      }
    } else if (withNativeArrayBuffer$2 && (data instanceof ArrayBuffer || isView$1(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);
  };

  /*
   * base64-arraybuffer 1.0.1 <https://github.com/niklasvh/base64-arraybuffer>
   * Copyright (c) 2022 Niklas von Hertzen <https://hertzen.com>
   * Released under MIT License
   */
  var chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'; // Use a lookup table to find the index.

  var lookup$1 = typeof Uint8Array === 'undefined' ? [] : new Uint8Array(256);

  for (var i$1 = 0; i$1 < chars.length; i$1++) {
    lookup$1[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$1[base64.charCodeAt(i)];
      encoded2 = lookup$1[base64.charCodeAt(i + 1)];
      encoded3 = lookup$1[base64.charCodeAt(i + 2)];
      encoded4 = lookup$1[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$1 = 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$1) {
      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":
        return data instanceof ArrayBuffer ? new Blob([data]) : data;

      case "arraybuffer":
      default:
        return data;
      // assuming the data is already an ArrayBuffer
    }
  };

  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 protocol$1 = 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 globalThis = (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 = setTimeout;
  var NATIVE_CLEAR_TIMEOUT = clearTimeout;
  function installTimerFunctions(obj, opts) {
    if (opts.useNativeTimers) {
      obj.setTimeoutFn = NATIVE_SET_TIMEOUT.bind(globalThis);
      obj.clearTimeoutFn = NATIVE_CLEAR_TIMEOUT.bind(globalThis);
    } else {
      obj.setTimeoutFn = setTimeout.bind(globalThis);
      obj.clearTimeoutFn = clearTimeout.bind(globalThis);
    }
  } // 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;
  }

  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 TransportError;
  }( /*#__PURE__*/_wrapNativeSuper(Error));

  var Transport = /*#__PURE__*/function (_Emitter) {
    _inherits(Transport, _Emitter);

    var _super2 = _createSuper(Transport);

    /**
     * Transport abstract constructor.
     *
     * @param {Object} options.
     * @api private
     */
    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.readyState = "";
      _this2.socket = opts.socket;
      return _this2;
    }
    /**
     * Emits an error.
     *
     * @param {String} reason
     * @param description
     * @param context - the error context
     * @return {Transport} for chaining
     * @api 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.
       *
       * @api public
       */

    }, {
      key: "open",
      value: function open() {
        if ("closed" === this.readyState || "" === this.readyState) {
          this.readyState = "opening";
          this.doOpen();
        }

        return this;
      }
      /**
       * Closes the transport.
       *
       * @api public
       */

    }, {
      key: "close",
      value: function close() {
        if ("opening" === this.readyState || "open" === this.readyState) {
          this.doClose();
          this.onClose();
        }

        return this;
      }
      /**
       * Sends multiple packets.
       *
       * @param {Array} packets
       * @api public
       */

    }, {
      key: "send",
      value: function send(packets) {
        if ("open" === this.readyState) {
          this.write(packets);
        }
      }
      /**
       * Called upon open
       *
       * @api 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
       * @api protected
       */

    }, {
      key: "onData",
      value: function onData(data) {
        var packet = decodePacket(data, this.socket.binaryType);
        this.onPacket(packet);
      }
      /**
       * Called with a decoded packet.
       *
       * @api protected
       */

    }, {
      key: "onPacket",
      value: function onPacket(packet) {
        _get(_getPrototypeOf(Transport.prototype), "emitReserved", this).call(this, "packet", packet);
      }
      /**
       * Called upon close.
       *
       * @api protected
       */

    }, {
      key: "onClose",
      value: function onClose(details) {
        this.readyState = "closed";

        _get(_getPrototypeOf(Transport.prototype), "emitReserved", this).call(this, "close", details);
      }
    }]);

    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$1(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$1(+new Date());
    if (now !== prev) return seed = 0, prev = now;
    return now + '.' + encode$1(seed++);
  } //
  // Map each character to its index.
  //

  for (; i < length; i++) {
    map[alphabet[i]] = i;
  }

  // imported from https://github.com/galkn/querystring

  /**
   * Compiles a querystring
   * Returns string representation of the object
   *
   * @param {Object}
   * @api private
   */
  function encode(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;
  }

  // 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 XMLHttpRequest$1 (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 globalThis[["Active"].concat("Object").join("X")]("Microsoft.XMLHTTP");
      } catch (e) {}
    }
  }

  function empty() {}

  var hasXHR2 = function () {
    var xhr = new XMLHttpRequest$1({
      xdomain: false
    });
    return null != xhr.responseType;
  }();

  var Polling = /*#__PURE__*/function (_Transport) {
    _inherits(Polling, _Transport);

    var _super = _createSuper(Polling);

    /**
     * XHR Polling constructor.
     *
     * @param {Object} opts
     * @api public
     */
    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;
        _this.xs = opts.secure !== isSSL;
      }
      /**
       * XHR supports binary
       */


      var forceBase64 = opts && opts.forceBase64;
      _this.supportsBinary = hasXHR2 && !forceBase64;
      return _this;
    }
    /**
     * Transport name.
     */


    _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.
       *
       * @api private
       */

    }, {
      key: "doOpen",
      value: function doOpen() {
        this.poll();
      }
      /**
       * Pauses polling.
       *
       * @param {Function} callback upon buffers are flushed and transport is paused
       * @api private
       */

    }, {
      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.
       *
       * @api public
       */

    }, {
      key: "poll",
      value: function poll() {
        this.polling = true;
        this.doPoll();
        this.emitReserved("poll");
      }
      /**
       * Overloads onData to detect payloads.
       *
       * @api private
       */

    }, {
      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.
       *
       * @api private
       */

    }, {
      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} data packets
       * @param {Function} drain callback
       * @api private
       */

    }, {
      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.
       *
       * @api private
       */

    }, {
      key: "uri",
      value: function uri() {
        var query = this.query || {};
        var schema = this.opts.secure ? "https" : "http";
        var port = ""; // cache busting is forced

        if (false !== this.opts.timestampRequests) {
          query[this.opts.timestampParam] = yeast();
        }

        if (!this.supportsBinary && !query.sid) {
          query.b64 = 1;
        } // avoid port if default for schema


        if (this.opts.port && ("https" === schema && Number(this.opts.port) !== 443 || "http" === schema && Number(this.opts.port) !== 80)) {
          port = ":" + this.opts.port;
        }

        var encodedQuery = encode(query);
        var ipv6 = this.opts.hostname.indexOf(":") !== -1;
        return schema + "://" + (ipv6 ? "[" + this.opts.hostname + "]" : this.opts.hostname) + port + this.opts.path + (encodedQuery.length ? "?" + encodedQuery : "");
      }
      /**
       * Creates a request.
       *
       * @param {String} method
       * @api private
       */

    }, {
      key: "request",
      value: function request() {
        var opts = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};

        _extends(opts, {
          xd: this.xd,
          xs: this.xs
        }, this.opts);

        return new Request(this.uri(), opts);
      }
      /**
       * Sends data.
       *
       * @param {String} data to send.
       * @param {Function} called upon flush.
       * @api 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.
       *
       * @api 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
     * @api public
     */
    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.async = false !== opts.async;
      _this8.data = undefined !== opts.data ? opts.data : null;

      _this8.create();

      return _this8;
    }
    /**
     * Creates the XHR object and sends the request.
     *
     * @api private
     */


    _createClass(Request, [{
      key: "create",
      value: function create() {
        var _this9 = this;

        var opts = pick(this.opts, "agent", "pfx", "key", "passphrase", "cert", "ca", "ciphers", "rejectUnauthorized", "autoUnref");
        opts.xdomain = !!this.opts.xd;
        opts.xscheme = !!this.opts.xs;
        var xhr = this.xhr = new XMLHttpRequest$1(opts);

        try {
          xhr.open(this.method, this.uri, this.async);

          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) {} // ie6 check


          if ("withCredentials" in xhr) {
            xhr.withCredentials = this.opts.withCredentials;
          }

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

          xhr.onreadystatechange = function () {
            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.
       *
       * @api private
       */

    }, {
      key: "onError",
      value: function onError(err) {
        this.emitReserved("error", err, this.xhr);
        this.cleanup(true);
      }
      /**
       * Cleans up house.
       *
       * @api 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.
       *
       * @api 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.
       *
       * @api public
       */

    }, {
      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 globalThis ? "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 = globalThis.WebSocket || globalThis.MozWebSocket;
  var usingBrowserWebSocket = true;
  var defaultBinaryType = "arraybuffer";

  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.
     *
     * @api {Object} connection options
     * @api public
     */
    function WS(opts) {
      var _this;

      _classCallCheck(this, WS);

      _this = _super.call(this, opts);
      _this.supportsBinary = !opts.forceBase64;
      return _this;
    }
    /**
     * Transport name.
     *
     * @api public
     */


    _createClass(WS, [{
      key: "name",
      get: function get() {
        return "websocket";
      }
      /**
       * Opens socket.
       *
       * @api private
       */

    }, {
      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
       *
       * @api 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);
        };
      }
      /**
       * Writes data to socket.
       *
       * @param {Array} array of packets.
       * @api private
       */

    }, {
      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(i) {
          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 = {};
            // 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(i);
        }
      }
      /**
       * Closes socket.
       *
       * @api private
       */

    }, {
      key: "doClose",
      value: function doClose() {
        if (typeof this.ws !== "undefined") {
          this.ws.close();
          this.ws = null;
        }
      }
      /**
       * Generates uri for connection.
       *
       * @api private
       */

    }, {
      key: "uri",
      value: function uri() {
        var query = this.query || {};
        var schema = this.opts.secure ? "wss" : "ws";
        var port = ""; // avoid port if default for schema

        if (this.opts.port && ("wss" === schema && Number(this.opts.port) !== 443 || "ws" === schema && Number(this.opts.port) !== 80)) {
          port = ":" + this.opts.port;
        } // append timestamp to URI


        if (this.opts.timestampRequests) {
          query[this.opts.timestampParam] = yeast();
        } // communicate binary support capabilities


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

        var encodedQuery = encode(query);
        var ipv6 = this.opts.hostname.indexOf(":") !== -1;
        return schema + "://" + (ipv6 ? "[" + this.opts.hostname + "]" : this.opts.hostname) + port + this.opts.path + (encodedQuery.length ? "?" + encodedQuery : "");
      }
      /**
       * Feature detection for WebSocket.
       *
       * @return {Boolean} whether this transport is available.
       * @api public
       */

    }, {
      key: "check",
      value: function check() {
        return !!WebSocket && !("__initialize" in WebSocket && this.name === WS.prototype.name);
      }
    }]);

    return WS;
  }(Transport);

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

  // imported from https://github.com/galkn/parseuri

  /**
   * Parses an URI
   *
   * @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.substr(0, 1) == '/' || path.length === 0) {
      names.splice(0, 1);
    }

    if (path.substr(path.length - 1, 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$1 = /*#__PURE__*/function (_Emitter) {
    _inherits(Socket, _Emitter);

    var _super = _createSuper(Socket);

    /**
     * Socket constructor.
     *
     * @param {String|Object} uri or options
     * @param {Object} opts - options
     * @api public
     */
    function Socket(uri) {
      var _this;

      var opts = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};

      _classCallCheck(this, Socket);

      _this = _super.call(this);

      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"];
      _this.readyState = "";
      _this.writeBuffer = [];
      _this.prevBufferLen = 0;
      _this.opts = _extends({
        path: "/engine.io",
        agent: false,
        withCredentials: false,
        upgrade: true,
        timestampParam: "t",
        rememberUpgrade: false,
        rejectUnauthorized: true,
        perMessageDeflate: {
          threshold: 1024
        },
        transportOptions: {},
        closeOnBeforeunload: true
      }, opts);
      _this.opts.path = _this.opts.path.replace(/\/$/, "") + "/";

      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)
          addEventListener("beforeunload", function () {
            if (_this.transport) {
              // silently close the transport
              _this.transport.removeAllListeners();

              _this.transport.close();
            }
          }, 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} transport name
     * @return {Transport}
     * @api private
     */


    _createClass(Socket, [{
      key: "createTransport",
      value: function createTransport(name) {
        var query = _extends({}, this.opts.query); // append engine.io protocol identifier


        query.EIO = protocol$1; // transport name

        query.transport = name; // session id if we already have one

        if (this.id) query.sid = this.id;

        var opts = _extends({}, this.opts.transportOptions[name], this.opts, {
          query: query,
          socket: this,
          hostname: this.hostname,
          secure: this.secure,
          port: this.port
        });

        return new transports[name](opts);
      }
      /**
       * Initializes transport to use and starts probe.
       *
       * @api 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).
       *
       * @api 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} transport name
       * @api 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);
        transport.open();
      }
      /**
       * Called when connection is deemed open.
       *
       * @api 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 && this.transport.pause) {
          var i = 0;
          var l = this.upgrades.length;

          for (; i < l; i++) {
            this.probe(this.upgrades[i]);
          }
        }
      }
      /**
       * Handles a packet.
       *
       * @api 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
       * @api 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.
       *
       * @api 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
       *
       * @api 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.
       *
       * @api 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} message.
       * @param {Function} callback function.
       * @param {Object} options.
       * @return {Socket} for chaining.
       * @api public
       */

    }, {
      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} packet type.
       * @param {String} data.
       * @param {Object} options.
       * @param {Function} callback function.
       * @api 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.
       *
       * @api public
       */

    }, {
      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
       *
       * @api private
       */

    }, {
      key: "onError",
      value: function onError(err) {
        Socket.priorWebsocketSuccess = false;
        this.emitReserved("error", err);
        this.onClose("transport error", err);
      }
      /**
       * Called upon transport close.
       *
       * @api 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("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} server upgrades
       * @api 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$1.protocol = protocol$1;

  /**
   * URL parser.
   *
   * @param uri - url
   * @param path - the request path of the connection
   * @param loc - An object meant to mimic window.location.
   *        Defaults to window.location.
   * @public
   */

  function url(uri) {
    var path = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : "";
    var loc = arguments.length > 2 ? arguments[2] : undefined;
    var obj = uri; // default to window.location

    loc = loc || typeof location !== "undefined" && location;
    if (null == uri) uri = loc.protocol + "//" + loc.host; // relative path support

    if (typeof uri === "string") {
      if ("/" === uri.charAt(0)) {
        if ("/" === uri.charAt(1)) {
          uri = loc.protocol + uri;
        } else {
          uri = loc.host + uri;
        }
      }

      if (!/^(https?|wss?):\/\//.test(uri)) {
        if ("undefined" !== typeof loc) {
          uri = loc.protocol + "//" + uri;
        } else {
          uri = "https://" + uri;
        }
      } // parse


      obj = parse(uri);
    } // make sure we treat `localhost:80` and `localhost` equally


    if (!obj.port) {
      if (/^(http|ws)$/.test(obj.protocol)) {
        obj.port = "80";
      } else if (/^(http|ws)s$/.test(obj.protocol)) {
        obj.port = "443";
      }
    }

    obj.path = obj.path || "/";
    var ipv6 = obj.host.indexOf(":") !== -1;
    var host = ipv6 ? "[" + obj.host + "]" : obj.host; // define unique id

    obj.id = obj.protocol + "://" + host + ":" + obj.port + path; // define href

    obj.href = obj.protocol + "://" + host + (loc && loc.port === obj.port ? "" : ":" + obj.port);
    return obj;
  }

  var withNativeArrayBuffer = typeof ArrayBuffer === "function";

  var isView = function isView(obj) {
    return typeof ArrayBuffer.isView === "function" ? ArrayBuffer.isView(obj) : obj.buffer instanceof ArrayBuffer;
  };

  var toString = Object.prototype.toString;
  var withNativeBlob = typeof Blob === "function" || typeof Blob !== "undefined" && toString.call(Blob) === "[object BlobConstructor]";
  var withNativeFile = typeof File === "function" || typeof File !== "undefined" && toString.call(File) === "[object FileConstructor]";
  /**
   * Returns true if obj is a Buffer, an ArrayBuffer, a Blob or a File.
   *
   * @private
   */

  function isBinary(obj) {
    return withNativeArrayBuffer && (obj instanceof ArrayBuffer || isView(obj)) || withNativeBlob && obj instanceof Blob || withNativeFile && obj instanceof File;
  }
  function hasBinary(obj, toJSON) {
    if (!obj || _typeof(obj) !== "object") {
      return false;
    }

    if (Array.isArray(obj)) {
      for (var i = 0, l = obj.length; i < l; i++) {
        if (hasBinary(obj[i])) {
          return true;
        }
      }

      return false;
    }

    if (isBinary(obj)) {
      return true;
    }

    if (obj.toJSON && typeof obj.toJSON === "function" && arguments.length === 1) {
      return hasBinary(obj.toJSON(), true);
    }

    for (var key in obj) {
      if (Object.prototype.hasOwnProperty.call(obj, key) && hasBinary(obj[key])) {
        return true;
      }
    }

    return false;
  }

  /**
   * Replaces every Buffer | ArrayBuffer | Blob | File in packet with a numbered placeholder.
   *
   * @param {Object} packet - socket.io event packet
   * @return {Object} with deconstructed packet and list of buffers
   * @public
   */

  function deconstructPacket(packet) {
    var buffers = [];
    var packetData = packet.data;
    var pack = packet;
    pack.data = _deconstructPacket(packetData, buffers);
    pack.attachments = buffers.length; // number of binary 'attachments'

    return {
      packet: pack,
      buffers: buffers
    };
  }

  function _deconstructPacket(data, buffers) {
    if (!data) return data;

    if (isBinary(data)) {
      var placeholder = {
        _placeholder: true,
        num: buffers.length
      };
      buffers.push(data);
      return placeholder;
    } else if (Array.isArray(data)) {
      var newData = new Array(data.length);

      for (var i = 0; i < data.length; i++) {
        newData[i] = _deconstructPacket(data[i], buffers);
      }

      return newData;
    } else if (_typeof(data) === "object" && !(data instanceof Date)) {
      var _newData = {};

      for (var key in data) {
        if (Object.prototype.hasOwnProperty.call(data, key)) {
          _newData[key] = _deconstructPacket(data[key], buffers);
        }
      }

      return _newData;
    }

    return data;
  }
  /**
   * Reconstructs a binary packet from its placeholder packet and buffers
   *
   * @param {Object} packet - event packet with placeholders
   * @param {Array} buffers - binary buffers to put in placeholder positions
   * @return {Object} reconstructed packet
   * @public
   */


  function reconstructPacket(packet, buffers) {
    packet.data = _reconstructPacket(packet.data, buffers);
    packet.attachments = undefined; // no longer useful

    return packet;
  }

  function _reconstructPacket(data, buffers) {
    if (!data) return data;

    if (data && data._placeholder) {
      return buffers[data.num]; // appropriate buffer (should be natural order anyway)
    } else if (Array.isArray(data)) {
      for (var i = 0; i < data.length; i++) {
        data[i] = _reconstructPacket(data[i], buffers);
      }
    } else if (_typeof(data) === "object") {
      for (var key in data) {
        if (Object.prototype.hasOwnProperty.call(data, key)) {
          data[key] = _reconstructPacket(data[key], buffers);
        }
      }
    }

    return data;
  }

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

  var protocol = 5;
  var PacketType;

  (function (PacketType) {
    PacketType[PacketType["CONNECT"] = 0] = "CONNECT";
    PacketType[PacketType["DISCONNECT"] = 1] = "DISCONNECT";
    PacketType[PacketType["EVENT"] = 2] = "EVENT";
    PacketType[PacketType["ACK"] = 3] = "ACK";
    PacketType[PacketType["CONNECT_ERROR"] = 4] = "CONNECT_ERROR";
    PacketType[PacketType["BINARY_EVENT"] = 5] = "BINARY_EVENT";
    PacketType[PacketType["BINARY_ACK"] = 6] = "BINARY_ACK";
  })(PacketType || (PacketType = {}));
  /**
   * A socket.io Encoder instance
   */


  var Encoder = /*#__PURE__*/function () {
    /**
     * Encoder constructor
     *
     * @param {function} replacer - custom replacer to pass down to JSON.parse
     */
    function Encoder(replacer) {
      _classCallCheck(this, Encoder);

      this.replacer = replacer;
    }
    /**
     * Encode a packet as a single string if non-binary, or as a
     * buffer sequence, depending on packet type.
     *
     * @param {Object} obj - packet object
     */


    _createClass(Encoder, [{
      key: "encode",
      value: function encode(obj) {
        if (obj.type === PacketType.EVENT || obj.type === PacketType.ACK) {
          if (hasBinary(obj)) {
            obj.type = obj.type === PacketType.EVENT ? PacketType.BINARY_EVENT : PacketType.BINARY_ACK;
            return this.encodeAsBinary(obj);
          }
        }

        return [this.encodeAsString(obj)];
      }
      /**
       * Encode packet as string.
       */

    }, {
      key: "encodeAsString",
      value: function encodeAsString(obj) {
        // first is type
        var str = "" + obj.type; // attachments if we have them

        if (obj.type === PacketType.BINARY_EVENT || obj.type === PacketType.BINARY_ACK) {
          str += obj.attachments + "-";
        } // if we have a namespace other than `/`
        // we append it followed by a comma `,`


        if (obj.nsp && "/" !== obj.nsp) {
          str += obj.nsp + ",";
        } // immediately followed by the id


        if (null != obj.id) {
          str += obj.id;
        } // json data


        if (null != obj.data) {
          str += JSON.stringify(obj.data, this.replacer);
        }

        return str;
      }
      /**
       * Encode packet as 'buffer sequence' by removing blobs, and
       * deconstructing packet into object with placeholders and
       * a list of buffers.
       */

    }, {
      key: "encodeAsBinary",
      value: function encodeAsBinary(obj) {
        var deconstruction = deconstructPacket(obj);
        var pack = this.encodeAsString(deconstruction.packet);
        var buffers = deconstruction.buffers;
        buffers.unshift(pack); // add packet info to beginning of data list

        return buffers; // write all the buffers
      }
    }]);

    return Encoder;
  }();
  /**
   * A socket.io Decoder instance
   *
   * @return {Object} decoder
   */

  var Decoder = /*#__PURE__*/function (_Emitter) {
    _inherits(Decoder, _Emitter);

    var _super = _createSuper(Decoder);

    /**
     * Decoder constructor
     *
     * @param {function} reviver - custom reviver to pass down to JSON.stringify
     */
    function Decoder(reviver) {
      var _this;

      _classCallCheck(this, Decoder);

      _this = _super.call(this);
      _this.reviver = reviver;
      return _this;
    }
    /**
     * Decodes an encoded packet string into packet JSON.
     *
     * @param {String} obj - encoded packet
     */


    _createClass(Decoder, [{
      key: "add",
      value: function add(obj) {
        var packet;

        if (typeof obj === "string") {
          packet = this.decodeString(obj);

          if (packet.type === PacketType.BINARY_EVENT || packet.type === PacketType.BINARY_ACK) {
            // binary packet's json
            this.reconstructor = new BinaryReconstructor(packet); // no attachments, labeled binary but no binary data to follow

            if (packet.attachments === 0) {
              _get(_getPrototypeOf(Decoder.prototype), "emitReserved", this).call(this, "decoded", packet);
            }
          } else {
            // non-binary full packet
            _get(_getPrototypeOf(Decoder.prototype), "emitReserved", this).call(this, "decoded", packet);
          }
        } else if (isBinary(obj) || obj.base64) {
          // raw binary data
          if (!this.reconstructor) {
            throw new Error("got binary data when not reconstructing a packet");
          } else {
            packet = this.reconstructor.takeBinaryData(obj);

            if (packet) {
              // received final buffer
              this.reconstructor = null;

              _get(_getPrototypeOf(Decoder.prototype), "emitReserved", this).call(this, "decoded", packet);
            }
          }
        } else {
          throw new Error("Unknown type: " + obj);
        }
      }
      /**
       * Decode a packet String (JSON data)
       *
       * @param {String} str
       * @return {Object} packet
       */

    }, {
      key: "decodeString",
      value: function decodeString(str) {
        var i = 0; // look up type

        var p = {
          type: Number(str.charAt(0))
        };

        if (PacketType[p.type] === undefined) {
          throw new Error("unknown packet type " + p.type);
        } // look up attachments if type binary


        if (p.type === PacketType.BINARY_EVENT || p.type === PacketType.BINARY_ACK) {
          var start = i + 1;

          while (str.charAt(++i) !== "-" && i != str.length) {}

          var buf = str.substring(start, i);

          if (buf != Number(buf) || str.charAt(i) !== "-") {
            throw new Error("Illegal attachments");
          }

          p.attachments = Number(buf);
        } // look up namespace (if any)


        if ("/" === str.charAt(i + 1)) {
          var _start = i + 1;

          while (++i) {
            var c = str.charAt(i);
            if ("," === c) break;
            if (i === str.length) break;
          }

          p.nsp = str.substring(_start, i);
        } else {
          p.nsp = "/";
        } // look up id


        var next = str.charAt(i + 1);

        if ("" !== next && Number(next) == next) {
          var _start2 = i + 1;

          while (++i) {
            var _c = str.charAt(i);

            if (null == _c || Number(_c) != _c) {
              --i;
              break;
            }

            if (i === str.length) break;
          }

          p.id = Number(str.substring(_start2, i + 1));
        } // look up json data


        if (str.charAt(++i)) {
          var payload = this.tryParse(str.substr(i));

          if (Decoder.isPayloadValid(p.type, payload)) {
            p.data = payload;
          } else {
            throw new Error("invalid payload");
          }
        }

        return p;
      }
    }, {
      key: "tryParse",
      value: function tryParse(str) {
        try {
          return JSON.parse(str, this.reviver);
        } catch (e) {
          return false;
        }
      }
    }, {
      key: "destroy",
      value:
      /**
       * Deallocates a parser's resources
       */
      function destroy() {
        if (this.reconstructor) {
          this.reconstructor.finishedReconstruction();
        }
      }
    }], [{
      key: "isPayloadValid",
      value: function isPayloadValid(type, payload) {
        switch (type) {
          case PacketType.CONNECT:
            return _typeof(payload) === "object";

          case PacketType.DISCONNECT:
            return payload === undefined;

          case PacketType.CONNECT_ERROR:
            return typeof payload === "string" || _typeof(payload) === "object";

          case PacketType.EVENT:
          case PacketType.BINARY_EVENT:
            return Array.isArray(payload) && payload.length > 0;

          case PacketType.ACK:
          case PacketType.BINARY_ACK:
            return Array.isArray(payload);
        }
      }
    }]);

    return Decoder;
  }(Emitter);
  /**
   * A manager of a binary event's 'buffer sequence'. Should
   * be constructed whenever a packet of type BINARY_EVENT is
   * decoded.
   *
   * @param {Object} packet
   * @return {BinaryReconstructor} initialized reconstructor
   */

  var BinaryReconstructor = /*#__PURE__*/function () {
    function BinaryReconstructor(packet) {
      _classCallCheck(this, BinaryReconstructor);

      this.packet = packet;
      this.buffers = [];
      this.reconPack = packet;
    }
    /**
     * Method to be called when binary data received from connection
     * after a BINARY_EVENT packet.
     *
     * @param {Buffer | ArrayBuffer} binData - the raw binary data received
     * @return {null | Object} returns null if more binary data is expected or
     *   a reconstructed packet object if all buffers have been received.
     */


    _createClass(BinaryReconstructor, [{
      key: "takeBinaryData",
      value: function takeBinaryData(binData) {
        this.buffers.push(binData);

        if (this.buffers.length === this.reconPack.attachments) {
          // done with buffer list
          var packet = reconstructPacket(this.reconPack, this.buffers);
          this.finishedReconstruction();
          return packet;
        }

        return null;
      }
      /**
       * Cleans up binary packet reconstruction variables.
       */

    }, {
      key: "finishedReconstruction",
      value: function finishedReconstruction() {
        this.reconPack = null;
        this.buffers = [];
      }
    }]);

    return BinaryReconstructor;
  }();

  var parser = /*#__PURE__*/Object.freeze({
    __proto__: null,
    protocol: protocol,
    get PacketType () { return PacketType; },
    Encoder: Encoder,
    Decoder: Decoder
  });

  function on(obj, ev, fn) {
    obj.on(ev, fn);
    return function subDestroy() {
      obj.off(ev, fn);
    };
  }

  /**
   * Internal events.
   * These events can't be emitted by the user.
   */

  var RESERVED_EVENTS = Object.freeze({
    connect: 1,
    connect_error: 1,
    disconnect: 1,
    disconnecting: 1,
    // EventEmitter reserved events: https://nodejs.org/api/events.html#events_event_newlistener
    newListener: 1,
    removeListener: 1
  });
  var Socket = /*#__PURE__*/function (_Emitter) {
    _inherits(Socket, _Emitter);

    var _super = _createSuper(Socket);

    /**
     * `Socket` constructor.
     *
     * @public
     */
    function Socket(io, nsp, opts) {
      var _this;

      _classCallCheck(this, Socket);

      _this = _super.call(this);
      _this.connected = false;
      _this.receiveBuffer = [];
      _this.sendBuffer = [];
      _this.ids = 0;
      _this.acks = {};
      _this.flags = {};
      _this.io = io;
      _this.nsp = nsp;

      if (opts && opts.auth) {
        _this.auth = opts.auth;
      }

      if (_this.io._autoConnect) _this.open();
      return _this;
    }
    /**
     * Whether the socket is currently disconnected
     */


    _createClass(Socket, [{
      key: "disconnected",
      get: function get() {
        return !this.connected;
      }
      /**
       * Subscribe to open, close and packet events
       *
       * @private
       */

    }, {
      key: "subEvents",
      value: function subEvents() {
        if (this.subs) return;
        var io = this.io;
        this.subs = [on(io, "open", this.onopen.bind(this)), on(io, "packet", this.onpacket.bind(this)), on(io, "error", this.onerror.bind(this)), on(io, "close", this.onclose.bind(this))];
      }
      /**
       * Whether the Socket will try to reconnect when its Manager connects or reconnects
       */

    }, {
      key: "active",
      get: function get() {
        return !!this.subs;
      }
      /**
       * "Opens" the socket.
       *
       * @public
       */

    }, {
      key: "connect",
      value: function connect() {
        if (this.connected) return this;
        this.subEvents();
        if (!this.io["_reconnecting"]) this.io.open(); // ensure open

        if ("open" === this.io._readyState) this.onopen();
        return this;
      }
      /**
       * Alias for connect()
       */

    }, {
      key: "open",
      value: function open() {
        return this.connect();
      }
      /**
       * Sends a `message` event.
       *
       * @return self
       * @public
       */

    }, {
      key: "send",
      value: function send() {
        for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {
          args[_key] = arguments[_key];
        }

        args.unshift("message");
        this.emit.apply(this, args);
        return this;
      }
      /**
       * Override `emit`.
       * If the event is in `events`, it's emitted normally.
       *
       * @return self
       * @public
       */

    }, {
      key: "emit",
      value: function emit(ev) {
        if (RESERVED_EVENTS.hasOwnProperty(ev)) {
          throw new Error('"' + ev + '" is a reserved event name');
        }

        for (var _len2 = arguments.length, args = new Array(_len2 > 1 ? _len2 - 1 : 0), _key2 = 1; _key2 < _len2; _key2++) {
          args[_key2 - 1] = arguments[_key2];
        }

        args.unshift(ev);
        var packet = {
          type: PacketType.EVENT,
          data: args
        };
        packet.options = {};
        packet.options.compress = this.flags.compress !== false; // event ack callback

        if ("function" === typeof args[args.length - 1]) {
          var id = this.ids++;
          var ack = args.pop();

          this._registerAckCallback(id, ack);

          packet.id = id;
        }

        var isTransportWritable = this.io.engine && this.io.engine.transport && this.io.engine.transport.writable;
        var discardPacket = this.flags["volatile"] && (!isTransportWritable || !this.connected);

        if (discardPacket) ; else if (this.connected) {
          this.notifyOutgoingListeners(packet);
          this.packet(packet);
        } else {
          this.sendBuffer.push(packet);
        }

        this.flags = {};
        return this;
      }
      /**
       * @private
       */

    }, {
      key: "_registerAckCallback",
      value: function _registerAckCallback(id, ack) {
        var _this2 = this;

        var timeout = this.flags.timeout;

        if (timeout === undefined) {
          this.acks[id] = ack;
          return;
        } // @ts-ignore


        var timer = this.io.setTimeoutFn(function () {
          delete _this2.acks[id];

          for (var i = 0; i < _this2.sendBuffer.length; i++) {
            if (_this2.sendBuffer[i].id === id) {
              _this2.sendBuffer.splice(i, 1);
            }
          }

          ack.call(_this2, new Error("operation has timed out"));
        }, timeout);

        this.acks[id] = function () {
          // @ts-ignore
          _this2.io.clearTimeoutFn(timer);

          for (var _len3 = arguments.length, args = new Array(_len3), _key3 = 0; _key3 < _len3; _key3++) {
            args[_key3] = arguments[_key3];
          }

          ack.apply(_this2, [null].concat(args));
        };
      }
      /**
       * Sends a packet.
       *
       * @param packet
       * @private
       */

    }, {
      key: "packet",
      value: function packet(_packet) {
        _packet.nsp = this.nsp;

        this.io._packet(_packet);
      }
      /**
       * Called upon engine `open`.
       *
       * @private
       */

    }, {
      key: "onopen",
      value: function onopen() {
        var _this3 = this;

        if (typeof this.auth == "function") {
          this.auth(function (data) {
            _this3.packet({
              type: PacketType.CONNECT,
              data: data
            });
          });
        } else {
          this.packet({
            type: PacketType.CONNECT,
            data: this.auth
          });
        }
      }
      /**
       * Called upon engine or manager `error`.
       *
       * @param err
       * @private
       */

    }, {
      key: "onerror",
      value: function onerror(err) {
        if (!this.connected) {
          this.emitReserved("connect_error", err);
        }
      }
      /**
       * Called upon engine `close`.
       *
       * @param reason
       * @param description
       * @private
       */

    }, {
      key: "onclose",
      value: function onclose(reason, description) {
        this.connected = false;
        delete this.id;
        this.emitReserved("disconnect", reason, description);
      }
      /**
       * Called with socket packet.
       *
       * @param packet
       * @private
       */

    }, {
      key: "onpacket",
      value: function onpacket(packet) {
        var sameNamespace = packet.nsp === this.nsp;
        if (!sameNamespace) return;

        switch (packet.type) {
          case PacketType.CONNECT:
            if (packet.data && packet.data.sid) {
              var id = packet.data.sid;
              this.onconnect(id);
            } else {
              this.emitReserved("connect_error", new Error("It seems you are trying to reach a Socket.IO server in v2.x with a v3.x client, but they are not compatible (more information here: https://socket.io/docs/v3/migrating-from-2-x-to-3-0/)"));
            }

            break;

          case PacketType.EVENT:
          case PacketType.BINARY_EVENT:
            this.onevent(packet);
            break;

          case PacketType.ACK:
          case PacketType.BINARY_ACK:
            this.onack(packet);
            break;

          case PacketType.DISCONNECT:
            this.ondisconnect();
            break;

          case PacketType.CONNECT_ERROR:
            this.destroy();
            var err = new Error(packet.data.message); // @ts-ignore

            err.data = packet.data.data;
            this.emitReserved("connect_error", err);
            break;
        }
      }
      /**
       * Called upon a server event.
       *
       * @param packet
       * @private
       */

    }, {
      key: "onevent",
      value: function onevent(packet) {
        var args = packet.data || [];

        if (null != packet.id) {
          args.push(this.ack(packet.id));
        }

        if (this.connected) {
          this.emitEvent(args);
        } else {
          this.receiveBuffer.push(Object.freeze(args));
        }
      }
    }, {
      key: "emitEvent",
      value: function emitEvent(args) {
        if (this._anyListeners && this._anyListeners.length) {
          var listeners = this._anyListeners.slice();

          var _iterator = _createForOfIteratorHelper(listeners),
              _step;

          try {
            for (_iterator.s(); !(_step = _iterator.n()).done;) {
              var listener = _step.value;
              listener.apply(this, args);
            }
          } catch (err) {
            _iterator.e(err);
          } finally {
            _iterator.f();
          }
        }

        _get(_getPrototypeOf(Socket.prototype), "emit", this).apply(this, args);
      }
      /**
       * Produces an ack callback to emit with an event.
       *
       * @private
       */

    }, {
      key: "ack",
      value: function ack(id) {
        var self = this;
        var sent = false;
        return function () {
          // prevent double callbacks
          if (sent) return;
          sent = true;

          for (var _len4 = arguments.length, args = new Array(_len4), _key4 = 0; _key4 < _len4; _key4++) {
            args[_key4] = arguments[_key4];
          }

          self.packet({
            type: PacketType.ACK,
            id: id,
            data: args
          });
        };
      }
      /**
       * Called upon a server acknowlegement.
       *
       * @param packet
       * @private
       */

    }, {
      key: "onack",
      value: function onack(packet) {
        var ack = this.acks[packet.id];

        if ("function" === typeof ack) {
          ack.apply(this, packet.data);
          delete this.acks[packet.id];
        }
      }
      /**
       * Called upon server connect.
       *
       * @private
       */

    }, {
      key: "onconnect",
      value: function onconnect(id) {
        this.id = id;
        this.connected = true;
        this.emitBuffered();
        this.emitReserved("connect");
      }
      /**
       * Emit buffered events (received and emitted).
       *
       * @private
       */

    }, {
      key: "emitBuffered",
      value: function emitBuffered() {
        var _this4 = this;

        this.receiveBuffer.forEach(function (args) {
          return _this4.emitEvent(args);
        });
        this.receiveBuffer = [];
        this.sendBuffer.forEach(function (packet) {
          _this4.notifyOutgoingListeners(packet);

          _this4.packet(packet);
        });
        this.sendBuffer = [];
      }
      /**
       * Called upon server disconnect.
       *
       * @private
       */

    }, {
      key: "ondisconnect",
      value: function ondisconnect() {
        this.destroy();
        this.onclose("io server disconnect");
      }
      /**
       * Called upon forced client/server side disconnections,
       * this method ensures the manager stops tracking us and
       * that reconnections don't get triggered for this.
       *
       * @private
       */

    }, {
      key: "destroy",
      value: function destroy() {
        if (this.subs) {
          // clean subscriptions to avoid reconnections
          this.subs.forEach(function (subDestroy) {
            return subDestroy();
          });
          this.subs = undefined;
        }

        this.io["_destroy"](this);
      }
      /**
       * Disconnects the socket manually.
       *
       * @return self
       * @public
       */

    }, {
      key: "disconnect",
      value: function disconnect() {
        if (this.connected) {
          this.packet({
            type: PacketType.DISCONNECT
          });
        } // remove socket from pool


        this.destroy();

        if (this.connected) {
          // fire events
          this.onclose("io client disconnect");
        }

        return this;
      }
      /**
       * Alias for disconnect()
       *
       * @return self
       * @public
       */

    }, {
      key: "close",
      value: function close() {
        return this.disconnect();
      }
      /**
       * Sets the compress flag.
       *
       * @param compress - if `true`, compresses the sending data
       * @return self
       * @public
       */

    }, {
      key: "compress",
      value: function compress(_compress) {
        this.flags.compress = _compress;
        return this;
      }
      /**
       * Sets a modifier for a subsequent event emission that the event message will be dropped when this socket is not
       * ready to send messages.
       *
       * @returns self
       * @public
       */

    }, {
      key: "volatile",
      get: function get() {
        this.flags["volatile"] = true;
        return this;
      }
      /**
       * Sets a modifier for a subsequent event emission that the callback will be called with an error when the
       * given number of milliseconds have elapsed without an acknowledgement from the server:
       *
       * ```
       * socket.timeout(5000).emit("my-event", (err) => {
       *   if (err) {
       *     // the server did not acknowledge the event in the given delay
       *   }
       * });
       * ```
       *
       * @returns self
       * @public
       */

    }, {
      key: "timeout",
      value: function timeout(_timeout) {
        this.flags.timeout = _timeout;
        return this;
      }
      /**
       * Adds a listener that will be fired when any event is emitted. The event name is passed as the first argument to the
       * callback.
       *
       * @param listener
       * @public
       */

    }, {
      key: "onAny",
      value: function onAny(listener) {
        this._anyListeners = this._anyListeners || [];

        this._anyListeners.push(listener);

        return this;
      }
      /**
       * Adds a listener that will be fired when any event is emitted. The event name is passed as the first argument to the
       * callback. The listener is added to the beginning of the listeners array.
       *
       * @param listener
       * @public
       */

    }, {
      key: "prependAny",
      value: function prependAny(listener) {
        this._anyListeners = this._anyListeners || [];

        this._anyListeners.unshift(listener);

        return this;
      }
      /**
       * Removes the listener that will be fired when any event is emitted.
       *
       * @param listener
       * @public
       */

    }, {
      key: "offAny",
      value: function offAny(listener) {
        if (!this._anyListeners) {
          return this;
        }

        if (listener) {
          var listeners = this._anyListeners;

          for (var i = 0; i < listeners.length; i++) {
            if (listener === listeners[i]) {
              listeners.splice(i, 1);
              return this;
            }
          }
        } else {
          this._anyListeners = [];
        }

        return this;
      }
      /**
       * Returns an array of listeners that are listening for any event that is specified. This array can be manipulated,
       * e.g. to remove listeners.
       *
       * @public
       */

    }, {
      key: "listenersAny",
      value: function listenersAny() {
        return this._anyListeners || [];
      }
      /**
       * Adds a listener that will be fired when any event is emitted. The event name is passed as the first argument to the
       * callback.
       *
       * @param listener
       *
       * <pre><code>
       *
       * socket.onAnyOutgoing((event, ...args) => {
       *   console.log(event);
       * });
       *
       * </pre></code>
       *
       * @public
       */

    }, {
      key: "onAnyOutgoing",
      value: function onAnyOutgoing(listener) {
        this._anyOutgoingListeners = this._anyOutgoingListeners || [];

        this._anyOutgoingListeners.push(listener);

        return this;
      }
      /**
       * Adds a listener that will be fired when any event is emitted. The event name is passed as the first argument to the
       * callback. The listener is added to the beginning of the listeners array.
       *
       * @param listener
       *
       * <pre><code>
       *
       * socket.prependAnyOutgoing((event, ...args) => {
       *   console.log(event);
       * });
       *
       * </pre></code>
       *
       * @public
       */

    }, {
      key: "prependAnyOutgoing",
      value: function prependAnyOutgoing(listener) {
        this._anyOutgoingListeners = this._anyOutgoingListeners || [];

        this._anyOutgoingListeners.unshift(listener);

        return this;
      }
      /**
       * Removes the listener that will be fired when any event is emitted.
       *
       * @param listener
       *
       * <pre><code>
       *
       * const handler = (event, ...args) => {
       *   console.log(event);
       * }
       *
       * socket.onAnyOutgoing(handler);
       *
       * // then later
       * socket.offAnyOutgoing(handler);
       *
       * </pre></code>
       *
       * @public
       */

    }, {
      key: "offAnyOutgoing",
      value: function offAnyOutgoing(listener) {
        if (!this._anyOutgoingListeners) {
          return this;
        }

        if (listener) {
          var listeners = this._anyOutgoingListeners;

          for (var i = 0; i < listeners.length; i++) {
            if (listener === listeners[i]) {
              listeners.splice(i, 1);
              return this;
            }
          }
        } else {
          this._anyOutgoingListeners = [];
        }

        return this;
      }
      /**
       * Returns an array of listeners that are listening for any event that is specified. This array can be manipulated,
       * e.g. to remove listeners.
       *
       * @public
       */

    }, {
      key: "listenersAnyOutgoing",
      value: function listenersAnyOutgoing() {
        return this._anyOutgoingListeners || [];
      }
      /**
       * Notify the listeners for each packet sent
       *
       * @param packet
       *
       * @private
       */

    }, {
      key: "notifyOutgoingListeners",
      value: function notifyOutgoingListeners(packet) {
        if (this._anyOutgoingListeners && this._anyOutgoingListeners.length) {
          var listeners = this._anyOutgoingListeners.slice();

          var _iterator2 = _createForOfIteratorHelper(listeners),
              _step2;

          try {
            for (_iterator2.s(); !(_step2 = _iterator2.n()).done;) {
              var listener = _step2.value;
              listener.apply(this, packet.data);
            }
          } catch (err) {
            _iterator2.e(err);
          } finally {
            _iterator2.f();
          }
        }
      }
    }]);

    return Socket;
  }(Emitter);

  /**
   * Initialize backoff timer with `opts`.
   *
   * - `min` initial timeout in milliseconds [100]
   * - `max` max timeout [10000]
   * - `jitter` [0]
   * - `factor` [2]
   *
   * @param {Object} opts
   * @api public
   */
  function Backoff(opts) {
    opts = opts || {};
    this.ms = opts.min || 100;
    this.max = opts.max || 10000;
    this.factor = opts.factor || 2;
    this.jitter = opts.jitter > 0 && opts.jitter <= 1 ? opts.jitter : 0;
    this.attempts = 0;
  }
  /**
   * Return the backoff duration.
   *
   * @return {Number}
   * @api public
   */

  Backoff.prototype.duration = function () {
    var ms = this.ms * Math.pow(this.factor, this.attempts++);

    if (this.jitter) {
      var rand = Math.random();
      var deviation = Math.floor(rand * this.jitter * ms);
      ms = (Math.floor(rand * 10) & 1) == 0 ? ms - deviation : ms + deviation;
    }

    return Math.min(ms, this.max) | 0;
  };
  /**
   * Reset the number of attempts.
   *
   * @api public
   */


  Backoff.prototype.reset = function () {
    this.attempts = 0;
  };
  /**
   * Set the minimum duration
   *
   * @api public
   */


  Backoff.prototype.setMin = function (min) {
    this.ms = min;
  };
  /**
   * Set the maximum duration
   *
   * @api public
   */


  Backoff.prototype.setMax = function (max) {
    this.max = max;
  };
  /**
   * Set the jitter
   *
   * @api public
   */


  Backoff.prototype.setJitter = function (jitter) {
    this.jitter = jitter;
  };

  var Manager = /*#__PURE__*/function (_Emitter) {
    _inherits(Manager, _Emitter);

    var _super = _createSuper(Manager);

    function Manager(uri, opts) {
      var _this;

      _classCallCheck(this, Manager);

      var _a;

      _this = _super.call(this);
      _this.nsps = {};
      _this.subs = [];

      if (uri && "object" === _typeof(uri)) {
        opts = uri;
        uri = undefined;
      }

      opts = opts || {};
      opts.path = opts.path || "/socket.io";
      _this.opts = opts;
      installTimerFunctions(_assertThisInitialized(_this), opts);

      _this.reconnection(opts.reconnection !== false);

      _this.reconnectionAttempts(opts.reconnectionAttempts || Infinity);

      _this.reconnectionDelay(opts.reconnectionDelay || 1000);

      _this.reconnectionDelayMax(opts.reconnectionDelayMax || 5000);

      _this.randomizationFactor((_a = opts.randomizationFactor) !== null && _a !== void 0 ? _a : 0.5);

      _this.backoff = new Backoff({
        min: _this.reconnectionDelay(),
        max: _this.reconnectionDelayMax(),
        jitter: _this.randomizationFactor()
      });

      _this.timeout(null == opts.timeout ? 20000 : opts.timeout);

      _this._readyState = "closed";
      _this.uri = uri;

      var _parser = opts.parser || parser;

      _this.encoder = new _parser.Encoder();
      _this.decoder = new _parser.Decoder();
      _this._autoConnect = opts.autoConnect !== false;
      if (_this._autoConnect) _this.open();
      return _this;
    }

    _createClass(Manager, [{
      key: "reconnection",
      value: function reconnection(v) {
        if (!arguments.length) return this._reconnection;
        this._reconnection = !!v;
        return this;
      }
    }, {
      key: "reconnectionAttempts",
      value: function reconnectionAttempts(v) {
        if (v === undefined) return this._reconnectionAttempts;
        this._reconnectionAttempts = v;
        return this;
      }
    }, {
      key: "reconnectionDelay",
      value: function reconnectionDelay(v) {
        var _a;

        if (v === undefined) return this._reconnectionDelay;
        this._reconnectionDelay = v;
        (_a = this.backoff) === null || _a === void 0 ? void 0 : _a.setMin(v);
        return this;
      }
    }, {
      key: "randomizationFactor",
      value: function randomizationFactor(v) {
        var _a;

        if (v === undefined) return this._randomizationFactor;
        this._randomizationFactor = v;
        (_a = this.backoff) === null || _a === void 0 ? void 0 : _a.setJitter(v);
        return this;
      }
    }, {
      key: "reconnectionDelayMax",
      value: function reconnectionDelayMax(v) {
        var _a;

        if (v === undefined) return this._reconnectionDelayMax;
        this._reconnectionDelayMax = v;
        (_a = this.backoff) === null || _a === void 0 ? void 0 : _a.setMax(v);
        return this;
      }
    }, {
      key: "timeout",
      value: function timeout(v) {
        if (!arguments.length) return this._timeout;
        this._timeout = v;
        return this;
      }
      /**
       * Starts trying to reconnect if reconnection is enabled and we have not
       * started reconnecting yet
       *
       * @private
       */

    }, {
      key: "maybeReconnectOnOpen",
      value: function maybeReconnectOnOpen() {
        // Only try to reconnect if it's the first time we're connecting
        if (!this._reconnecting && this._reconnection && this.backoff.attempts === 0) {
          // keeps reconnection from firing twice for the same reconnection loop
          this.reconnect();
        }
      }
      /**
       * Sets the current transport `socket`.
       *
       * @param {Function} fn - optional, callback
       * @return self
       * @public
       */

    }, {
      key: "open",
      value: function open(fn) {
        var _this2 = this;

        if (~this._readyState.indexOf("open")) return this;
        this.engine = new Socket$1(this.uri, this.opts);
        var socket = this.engine;
        var self = this;
        this._readyState = "opening";
        this.skipReconnect = false; // emit `open`

        var openSubDestroy = on(socket, "open", function () {
          self.onopen();
          fn && fn();
        }); // emit `error`

        var errorSub = on(socket, "error", function (err) {
          self.cleanup();
          self._readyState = "closed";

          _this2.emitReserved("error", err);

          if (fn) {
            fn(err);
          } else {
            // Only do this if there is no fn to handle the error
            self.maybeReconnectOnOpen();
          }
        });

        if (false !== this._timeout) {
          var timeout = this._timeout;

          if (timeout === 0) {
            openSubDestroy(); // prevents a race condition with the 'open' event
          } // set timer


          var timer = this.setTimeoutFn(function () {
            openSubDestroy();
            socket.close(); // @ts-ignore

            socket.emit("error", new Error("timeout"));
          }, timeout);

          if (this.opts.autoUnref) {
            timer.unref();
          }

          this.subs.push(function subDestroy() {
            clearTimeout(timer);
          });
        }

        this.subs.push(openSubDestroy);
        this.subs.push(errorSub);
        return this;
      }
      /**
       * Alias for open()
       *
       * @return self
       * @public
       */

    }, {
      key: "connect",
      value: function connect(fn) {
        return this.open(fn);
      }
      /**
       * Called upon transport open.
       *
       * @private
       */

    }, {
      key: "onopen",
      value: function onopen() {
        // clear old subs
        this.cleanup(); // mark as open

        this._readyState = "open";
        this.emitReserved("open"); // add new subs

        var socket = this.engine;
        this.subs.push(on(socket, "ping", this.onping.bind(this)), on(socket, "data", this.ondata.bind(this)), on(socket, "error", this.onerror.bind(this)), on(socket, "close", this.onclose.bind(this)), on(this.decoder, "decoded", this.ondecoded.bind(this)));
      }
      /**
       * Called upon a ping.
       *
       * @private
       */

    }, {
      key: "onping",
      value: function onping() {
        this.emitReserved("ping");
      }
      /**
       * Called with data.
       *
       * @private
       */

    }, {
      key: "ondata",
      value: function ondata(data) {
        this.decoder.add(data);
      }
      /**
       * Called when parser fully decodes a packet.
       *
       * @private
       */

    }, {
      key: "ondecoded",
      value: function ondecoded(packet) {
        this.emitReserved("packet", packet);
      }
      /**
       * Called upon socket error.
       *
       * @private
       */

    }, {
      key: "onerror",
      value: function onerror(err) {
        this.emitReserved("error", err);
      }
      /**
       * Creates a new socket for the given `nsp`.
       *
       * @return {Socket}
       * @public
       */

    }, {
      key: "socket",
      value: function socket(nsp, opts) {
        var socket = this.nsps[nsp];

        if (!socket) {
          socket = new Socket(this, nsp, opts);
          this.nsps[nsp] = socket;
        }

        return socket;
      }
      /**
       * Called upon a socket close.
       *
       * @param socket
       * @private
       */

    }, {
      key: "_destroy",
      value: function _destroy(socket) {
        var nsps = Object.keys(this.nsps);

        for (var _i = 0, _nsps = nsps; _i < _nsps.length; _i++) {
          var nsp = _nsps[_i];
          var _socket = this.nsps[nsp];

          if (_socket.active) {
            return;
          }
        }

        this._close();
      }
      /**
       * Writes a packet.
       *
       * @param packet
       * @private
       */

    }, {
      key: "_packet",
      value: function _packet(packet) {
        var encodedPackets = this.encoder.encode(packet);

        for (var i = 0; i < encodedPackets.length; i++) {
          this.engine.write(encodedPackets[i], packet.options);
        }
      }
      /**
       * Clean up transport subscriptions and packet buffer.
       *
       * @private
       */

    }, {
      key: "cleanup",
      value: function cleanup() {
        this.subs.forEach(function (subDestroy) {
          return subDestroy();
        });
        this.subs.length = 0;
        this.decoder.destroy();
      }
      /**
       * Close the current socket.
       *
       * @private
       */

    }, {
      key: "_close",
      value: function _close() {
        this.skipReconnect = true;
        this._reconnecting = false;
        this.onclose("forced close");
        if (this.engine) this.engine.close();
      }
      /**
       * Alias for close()
       *
       * @private
       */

    }, {
      key: "disconnect",
      value: function disconnect() {
        return this._close();
      }
      /**
       * Called upon engine close.
       *
       * @private
       */

    }, {
      key: "onclose",
      value: function onclose(reason, description) {
        this.cleanup();
        this.backoff.reset();
        this._readyState = "closed";
        this.emitReserved("close", reason, description);

        if (this._reconnection && !this.skipReconnect) {
          this.reconnect();
        }
      }
      /**
       * Attempt a reconnection.
       *
       * @private
       */

    }, {
      key: "reconnect",
      value: function reconnect() {
        var _this3 = this;

        if (this._reconnecting || this.skipReconnect) return this;
        var self = this;

        if (this.backoff.attempts >= this._reconnectionAttempts) {
          this.backoff.reset();
          this.emitReserved("reconnect_failed");
          this._reconnecting = false;
        } else {
          var delay = this.backoff.duration();
          this._reconnecting = true;
          var timer = this.setTimeoutFn(function () {
            if (self.skipReconnect) return;

            _this3.emitReserved("reconnect_attempt", self.backoff.attempts); // check again for the case socket closed in above events


            if (self.skipReconnect) return;
            self.open(function (err) {
              if (err) {
                self._reconnecting = false;
                self.reconnect();

                _this3.emitReserved("reconnect_error", err);
              } else {
                self.onreconnect();
              }
            });
          }, delay);

          if (this.opts.autoUnref) {
            timer.unref();
          }

          this.subs.push(function subDestroy() {
            clearTimeout(timer);
          });
        }
      }
      /**
       * Called upon successful reconnect.
       *
       * @private
       */

    }, {
      key: "onreconnect",
      value: function onreconnect() {
        var attempt = this.backoff.attempts;
        this._reconnecting = false;
        this.backoff.reset();
        this.emitReserved("reconnect", attempt);
      }
    }]);

    return Manager;
  }(Emitter);

  /**
   * Managers cache.
   */

  var cache = {};

  function lookup(uri, opts) {
    if (_typeof(uri) === "object") {
      opts = uri;
      uri = undefined;
    }

    opts = opts || {};
    var parsed = url(uri, opts.path || "/socket.io");
    var source = parsed.source;
    var id = parsed.id;
    var path = parsed.path;
    var sameNamespace = cache[id] && path in cache[id]["nsps"];
    var newConnection = opts.forceNew || opts["force new connection"] || false === opts.multiplex || sameNamespace;
    var io;

    if (newConnection) {
      io = new Manager(source, opts);
    } else {
      if (!cache[id]) {
        cache[id] = new Manager(source, opts);
      }

      io = cache[id];
    }

    if (parsed.query && !opts.query) {
      opts.query = parsed.queryKey;
    }

    return io.socket(parsed.path, opts);
  } // so that "lookup" can be used both as a function (e.g. `io(...)`) and as a
  // namespace (e.g. `io.connect(...)`), for backward compatibility


  _extends(lookup, {
    Manager: Manager,
    Socket: Socket,
    io: lookup,
    connect: lookup
  });

  return lookup;

}));
//# sourceMappingURL=socket.io.js.map

socket.io.js.map

{"version":3,"file":"socket.io.js","sources":["../node_modules/engine.io-client/node_modules/engine.io-parser/build/esm/commons.js","../node_modules/engine.io-client/node_modules/engine.io-parser/build/esm/encodePacket.browser.js","../node_modules/@socket.io/base64-arraybuffer/dist/base64-arraybuffer.es5.js","../node_modules/engine.io-client/node_modules/engine.io-parser/build/esm/decodePacket.browser.js","../node_modules/engine.io-client/node_modules/engine.io-parser/build/esm/index.js","../node_modules/@socket.io/component-emitter/index.mjs","../node_modules/engine.io-client/build/esm/globalThis.browser.js","../node_modules/engine.io-client/build/esm/util.js","../node_modules/engine.io-client/build/esm/transport.js","../node_modules/engine.io-client/build/esm/contrib/yeast.js","../node_modules/engine.io-client/build/esm/contrib/parseqs.js","../node_modules/engine.io-client/build/esm/contrib/has-cors.js","../node_modules/engine.io-client/build/esm/transports/xmlhttprequest.browser.js","../node_modules/engine.io-client/build/esm/transports/polling.js","../node_modules/engine.io-client/build/esm/transports/websocket-constructor.browser.js","../node_modules/engine.io-client/build/esm/transports/websocket.js","../node_modules/engine.io-client/build/esm/transports/index.js","../node_modules/engine.io-client/build/esm/contrib/parseuri.js","../node_modules/engine.io-client/build/esm/socket.js","../build/esm/url.js","../node_modules/socket.io-parser/build/esm/is-binary.js","../node_modules/socket.io-parser/build/esm/binary.js","../node_modules/socket.io-parser/build/esm/index.js","../build/esm/on.js","../build/esm/socket.js","../build/esm/contrib/backo2.js","../build/esm/manager.js","../build/esm/index.js"],"sourcesContent":["const PACKET_TYPES = Object.create(null); // no Map = no polyfill\nPACKET_TYPES[\"open\"] = \"0\";\nPACKET_TYPES[\"close\"] = \"1\";\nPACKET_TYPES[\"ping\"] = \"2\";\nPACKET_TYPES[\"pong\"] = \"3\";\nPACKET_TYPES[\"message\"] = \"4\";\nPACKET_TYPES[\"upgrade\"] = \"5\";\nPACKET_TYPES[\"noop\"] = \"6\";\nconst PACKET_TYPES_REVERSE = Object.create(null);\nObject.keys(PACKET_TYPES).forEach(key => {\n    PACKET_TYPES_REVERSE[PACKET_TYPES[key]] = key;\n});\nconst ERROR_PACKET = { type: \"error\", data: \"parser error\" };\nexport { PACKET_TYPES, PACKET_TYPES_REVERSE, ERROR_PACKET };\n","import { PACKET_TYPES } from \"./commons.js\";\nconst withNativeBlob = typeof Blob === \"function\" ||\n    (typeof Blob !== \"undefined\" &&\n        Object.prototype.toString.call(Blob) === \"[object BlobConstructor]\");\nconst withNativeArrayBuffer = typeof ArrayBuffer === \"function\";\n// ArrayBuffer.isView method is not defined in IE10\nconst isView = obj => {\n    return typeof ArrayBuffer.isView === \"function\"\n        ? ArrayBuffer.isView(obj)\n        : obj && obj.buffer instanceof ArrayBuffer;\n};\nconst encodePacket = ({ type, data }, supportsBinary, callback) => {\n    if (withNativeBlob && data instanceof Blob) {\n        if (supportsBinary) {\n            return callback(data);\n        }\n        else {\n            return encodeBlobAsBase64(data, callback);\n        }\n    }\n    else if (withNativeArrayBuffer &&\n        (data instanceof ArrayBuffer || isView(data))) {\n        if (supportsBinary) {\n            return callback(data);\n        }\n        else {\n            return encodeBlobAsBase64(new Blob([data]), callback);\n        }\n    }\n    // plain string\n    return callback(PACKET_TYPES[type] + (data || \"\"));\n};\nconst encodeBlobAsBase64 = (data, callback) => {\n    const fileReader = new FileReader();\n    fileReader.onload = function () {\n        const content = fileReader.result.split(\",\")[1];\n        callback(\"b\" + content);\n    };\n    return fileReader.readAsDataURL(data);\n};\nexport default encodePacket;\n","/*\n * base64-arraybuffer 1.0.1 <https://github.com/niklasvh/base64-arraybuffer>\n * Copyright (c) 2022 Niklas von Hertzen <https://hertzen.com>\n * Released under MIT License\n */\nvar chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';\n// Use a lookup table to find the index.\nvar lookup = typeof Uint8Array === 'undefined' ? [] : new Uint8Array(256);\nfor (var i = 0; i < chars.length; i++) {\n    lookup[chars.charCodeAt(i)] = i;\n}\nvar encode = function (arraybuffer) {\n    var bytes = new Uint8Array(arraybuffer), i, len = bytes.length, base64 = '';\n    for (i = 0; i < len; i += 3) {\n        base64 += chars[bytes[i] >> 2];\n        base64 += chars[((bytes[i] & 3) << 4) | (bytes[i + 1] >> 4)];\n        base64 += chars[((bytes[i + 1] & 15) << 2) | (bytes[i + 2] >> 6)];\n        base64 += chars[bytes[i + 2] & 63];\n    }\n    if (len % 3 === 2) {\n        base64 = base64.substring(0, base64.length - 1) + '=';\n    }\n    else if (len % 3 === 1) {\n        base64 = base64.substring(0, base64.length - 2) + '==';\n    }\n    return base64;\n};\nvar decode = function (base64) {\n    var bufferLength = base64.length * 0.75, len = base64.length, i, p = 0, encoded1, encoded2, encoded3, encoded4;\n    if (base64[base64.length - 1] === '=') {\n        bufferLength--;\n        if (base64[base64.length - 2] === '=') {\n            bufferLength--;\n        }\n    }\n    var arraybuffer = new ArrayBuffer(bufferLength), bytes = new Uint8Array(arraybuffer);\n    for (i = 0; i < len; i += 4) {\n        encoded1 = lookup[base64.charCodeAt(i)];\n        encoded2 = lookup[base64.charCodeAt(i + 1)];\n        encoded3 = lookup[base64.charCodeAt(i + 2)];\n        encoded4 = lookup[base64.charCodeAt(i + 3)];\n        bytes[p++] = (encoded1 << 2) | (encoded2 >> 4);\n        bytes[p++] = ((encoded2 & 15) << 4) | (encoded3 >> 2);\n        bytes[p++] = ((encoded3 & 3) << 6) | (encoded4 & 63);\n    }\n    return arraybuffer;\n};\n\nexport { decode, encode };\n//# sourceMappingURL=base64-arraybuffer.es5.js.map\n","import { ERROR_PACKET, PACKET_TYPES_REVERSE } from \"./commons.js\";\nimport { decode } from \"@socket.io/base64-arraybuffer\";\nconst withNativeArrayBuffer = typeof ArrayBuffer === \"function\";\nconst decodePacket = (encodedPacket, binaryType) => {\n    if (typeof encodedPacket !== \"string\") {\n        return {\n            type: \"message\",\n            data: mapBinary(encodedPacket, binaryType)\n        };\n    }\n    const type = encodedPacket.charAt(0);\n    if (type === \"b\") {\n        return {\n            type: \"message\",\n            data: decodeBase64Packet(encodedPacket.substring(1), binaryType)\n        };\n    }\n    const packetType = PACKET_TYPES_REVERSE[type];\n    if (!packetType) {\n        return ERROR_PACKET;\n    }\n    return encodedPacket.length > 1\n        ? {\n            type: PACKET_TYPES_REVERSE[type],\n            data: encodedPacket.substring(1)\n        }\n        : {\n            type: PACKET_TYPES_REVERSE[type]\n        };\n};\nconst decodeBase64Packet = (data, binaryType) => {\n    if (withNativeArrayBuffer) {\n        const decoded = decode(data);\n        return mapBinary(decoded, binaryType);\n    }\n    else {\n        return { base64: true, data }; // fallback for old browsers\n    }\n};\nconst mapBinary = (data, binaryType) => {\n    switch (binaryType) {\n        case \"blob\":\n            return data instanceof ArrayBuffer ? new Blob([data]) : data;\n        case \"arraybuffer\":\n        default:\n            return data; // assuming the data is already an ArrayBuffer\n    }\n};\nexport default decodePacket;\n","import encodePacket from \"./encodePacket.js\";\nimport decodePacket from \"./decodePacket.js\";\nconst SEPARATOR = String.fromCharCode(30); // see https://en.wikipedia.org/wiki/Delimiter#ASCII_delimited_text\nconst encodePayload = (packets, callback) => {\n    // some packets may be added to the array while encoding, so the initial length must be saved\n    const length = packets.length;\n    const encodedPackets = new Array(length);\n    let count = 0;\n    packets.forEach((packet, i) => {\n        // force base64 encoding for binary packets\n        encodePacket(packet, false, encodedPacket => {\n            encodedPackets[i] = encodedPacket;\n            if (++count === length) {\n                callback(encodedPackets.join(SEPARATOR));\n            }\n        });\n    });\n};\nconst decodePayload = (encodedPayload, binaryType) => {\n    const encodedPackets = encodedPayload.split(SEPARATOR);\n    const packets = [];\n    for (let i = 0; i < encodedPackets.length; i++) {\n        const decodedPacket = decodePacket(encodedPackets[i], binaryType);\n        packets.push(decodedPacket);\n        if (decodedPacket.type === \"error\") {\n            break;\n        }\n    }\n    return packets;\n};\nexport const protocol = 4;\nexport { encodePacket, encodePayload, decodePacket, decodePayload };\n","/**\n * Initialize a new `Emitter`.\n *\n * @api public\n */\n\nexport function Emitter(obj) {\n  if (obj) return mixin(obj);\n}\n\n/**\n * Mixin the emitter properties.\n *\n * @param {Object} obj\n * @return {Object}\n * @api private\n */\n\nfunction mixin(obj) {\n  for (var key in Emitter.prototype) {\n    obj[key] = Emitter.prototype[key];\n  }\n  return obj;\n}\n\n/**\n * Listen on the given `event` with `fn`.\n *\n * @param {String} event\n * @param {Function} fn\n * @return {Emitter}\n * @api public\n */\n\nEmitter.prototype.on =\nEmitter.prototype.addEventListener = function(event, fn){\n  this._callbacks = this._callbacks || {};\n  (this._callbacks['$' + event] = this._callbacks['$' + event] || [])\n    .push(fn);\n  return this;\n};\n\n/**\n * Adds an `event` listener that will be invoked a single\n * time then automatically removed.\n *\n * @param {String} event\n * @param {Function} fn\n * @return {Emitter}\n * @api public\n */\n\nEmitter.prototype.once = function(event, fn){\n  function on() {\n    this.off(event, on);\n    fn.apply(this, arguments);\n  }\n\n  on.fn = fn;\n  this.on(event, on);\n  return this;\n};\n\n/**\n * Remove the given callback for `event` or all\n * registered callbacks.\n *\n * @param {String} event\n * @param {Function} fn\n * @return {Emitter}\n * @api public\n */\n\nEmitter.prototype.off =\nEmitter.prototype.removeListener =\nEmitter.prototype.removeAllListeners =\nEmitter.prototype.removeEventListener = function(event, fn){\n  this._callbacks = this._callbacks || {};\n\n  // all\n  if (0 == arguments.length) {\n    this._callbacks = {};\n    return this;\n  }\n\n  // specific event\n  var callbacks = this._callbacks['$' + event];\n  if (!callbacks) return this;\n\n  // remove all handlers\n  if (1 == arguments.length) {\n    delete this._callbacks['$' + event];\n    return this;\n  }\n\n  // remove specific handler\n  var cb;\n  for (var i = 0; i < callbacks.length; i++) {\n    cb = callbacks[i];\n    if (cb === fn || cb.fn === fn) {\n      callbacks.splice(i, 1);\n      break;\n    }\n  }\n\n  // Remove event specific arrays for event types that no\n  // one is subscribed for to avoid memory leak.\n  if (callbacks.length === 0) {\n    delete this._callbacks['$' + event];\n  }\n\n  return this;\n};\n\n/**\n * Emit `event` with the given args.\n *\n * @param {String} event\n * @param {Mixed} ...\n * @return {Emitter}\n */\n\nEmitter.prototype.emit = function(event){\n  this._callbacks = this._callbacks || {};\n\n  var args = new Array(arguments.length - 1)\n    , callbacks = this._callbacks['$' + event];\n\n  for (var i = 1; i < arguments.length; i++) {\n    args[i - 1] = arguments[i];\n  }\n\n  if (callbacks) {\n    callbacks = callbacks.slice(0);\n    for (var i = 0, len = callbacks.length; i < len; ++i) {\n      callbacks[i].apply(this, args);\n    }\n  }\n\n  return this;\n};\n\n// alias used for reserved events (protected method)\nEmitter.prototype.emitReserved = Emitter.prototype.emit;\n\n/**\n * Return array of callbacks for `event`.\n *\n * @param {String} event\n * @return {Array}\n * @api public\n */\n\nEmitter.prototype.listeners = function(event){\n  this._callbacks = this._callbacks || {};\n  return this._callbacks['$' + event] || [];\n};\n\n/**\n * Check if this emitter has `event` handlers.\n *\n * @param {String} event\n * @return {Boolean}\n * @api public\n */\n\nEmitter.prototype.hasListeners = function(event){\n  return !! this.listeners(event).length;\n};\n","export default (() => {\n    if (typeof self !== \"undefined\") {\n        return self;\n    }\n    else if (typeof window !== \"undefined\") {\n        return window;\n    }\n    else {\n        return Function(\"return this\")();\n    }\n})();\n","import globalThis from \"./globalThis.js\";\nexport function pick(obj, ...attr) {\n    return attr.reduce((acc, k) => {\n        if (obj.hasOwnProperty(k)) {\n            acc[k] = obj[k];\n        }\n        return acc;\n    }, {});\n}\n// Keep a reference to the real timeout functions so they can be used when overridden\nconst NATIVE_SET_TIMEOUT = setTimeout;\nconst NATIVE_CLEAR_TIMEOUT = clearTimeout;\nexport function installTimerFunctions(obj, opts) {\n    if (opts.useNativeTimers) {\n        obj.setTimeoutFn = NATIVE_SET_TIMEOUT.bind(globalThis);\n        obj.clearTimeoutFn = NATIVE_CLEAR_TIMEOUT.bind(globalThis);\n    }\n    else {\n        obj.setTimeoutFn = setTimeout.bind(globalThis);\n        obj.clearTimeoutFn = clearTimeout.bind(globalThis);\n    }\n}\n// base64 encoded buffers are about 33% bigger (https://en.wikipedia.org/wiki/Base64)\nconst BASE64_OVERHEAD = 1.33;\n// we could also have used `new Blob([obj]).size`, but it isn't supported in IE9\nexport function byteLength(obj) {\n    if (typeof obj === \"string\") {\n        return utf8Length(obj);\n    }\n    // arraybuffer or blob\n    return Math.ceil((obj.byteLength || obj.size) * BASE64_OVERHEAD);\n}\nfunction utf8Length(str) {\n    let c = 0, length = 0;\n    for (let i = 0, l = str.length; i < l; i++) {\n        c = str.charCodeAt(i);\n        if (c < 0x80) {\n            length += 1;\n        }\n        else if (c < 0x800) {\n            length += 2;\n        }\n        else if (c < 0xd800 || c >= 0xe000) {\n            length += 3;\n        }\n        else {\n            i++;\n            length += 4;\n        }\n    }\n    return length;\n}\n","import { decodePacket } from \"engine.io-parser\";\nimport { Emitter } from \"@socket.io/component-emitter\";\nimport { installTimerFunctions } from \"./util.js\";\nclass TransportError extends Error {\n    constructor(reason, description, context) {\n        super(reason);\n        this.description = description;\n        this.context = context;\n        this.type = \"TransportError\";\n    }\n}\nexport class Transport extends Emitter {\n    /**\n     * Transport abstract constructor.\n     *\n     * @param {Object} options.\n     * @api private\n     */\n    constructor(opts) {\n        super();\n        this.writable = false;\n        installTimerFunctions(this, opts);\n        this.opts = opts;\n        this.query = opts.query;\n        this.readyState = \"\";\n        this.socket = opts.socket;\n    }\n    /**\n     * Emits an error.\n     *\n     * @param {String} reason\n     * @param description\n     * @param context - the error context\n     * @return {Transport} for chaining\n     * @api protected\n     */\n    onError(reason, description, context) {\n        super.emitReserved(\"error\", new TransportError(reason, description, context));\n        return this;\n    }\n    /**\n     * Opens the transport.\n     *\n     * @api public\n     */\n    open() {\n        if (\"closed\" === this.readyState || \"\" === this.readyState) {\n            this.readyState = \"opening\";\n            this.doOpen();\n        }\n        return this;\n    }\n    /**\n     * Closes the transport.\n     *\n     * @api public\n     */\n    close() {\n        if (\"opening\" === this.readyState || \"open\" === this.readyState) {\n            this.doClose();\n            this.onClose();\n        }\n        return this;\n    }\n    /**\n     * Sends multiple packets.\n     *\n     * @param {Array} packets\n     * @api public\n     */\n    send(packets) {\n        if (\"open\" === this.readyState) {\n            this.write(packets);\n        }\n        else {\n            // this might happen if the transport was silently closed in the beforeunload event handler\n        }\n    }\n    /**\n     * Called upon open\n     *\n     * @api protected\n     */\n    onOpen() {\n        this.readyState = \"open\";\n        this.writable = true;\n        super.emitReserved(\"open\");\n    }\n    /**\n     * Called with data.\n     *\n     * @param {String} data\n     * @api protected\n     */\n    onData(data) {\n        const packet = decodePacket(data, this.socket.binaryType);\n        this.onPacket(packet);\n    }\n    /**\n     * Called with a decoded packet.\n     *\n     * @api protected\n     */\n    onPacket(packet) {\n        super.emitReserved(\"packet\", packet);\n    }\n    /**\n     * Called upon close.\n     *\n     * @api protected\n     */\n    onClose(details) {\n        this.readyState = \"closed\";\n        super.emitReserved(\"close\", details);\n    }\n}\n","// imported from https://github.com/unshiftio/yeast\n'use strict';\nconst alphabet = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-_'.split(''), length = 64, map = {};\nlet seed = 0, i = 0, prev;\n/**\n * Return a string representing the specified number.\n *\n * @param {Number} num The number to convert.\n * @returns {String} The string representation of the number.\n * @api public\n */\nexport function encode(num) {\n    let encoded = '';\n    do {\n        encoded = alphabet[num % length] + encoded;\n        num = Math.floor(num / length);\n    } while (num > 0);\n    return encoded;\n}\n/**\n * Return the integer value specified by the given string.\n *\n * @param {String} str The string to convert.\n * @returns {Number} The integer value represented by the string.\n * @api public\n */\nexport function decode(str) {\n    let decoded = 0;\n    for (i = 0; i < str.length; i++) {\n        decoded = decoded * length + map[str.charAt(i)];\n    }\n    return decoded;\n}\n/**\n * Yeast: A tiny growing id generator.\n *\n * @returns {String} A unique id.\n * @api public\n */\nexport function yeast() {\n    const now = encode(+new Date());\n    if (now !== prev)\n        return seed = 0, prev = now;\n    return now + '.' + encode(seed++);\n}\n//\n// Map each character to its index.\n//\nfor (; i < length; i++)\n    map[alphabet[i]] = i;\n","// imported from https://github.com/galkn/querystring\n/**\n * Compiles a querystring\n * Returns string representation of the object\n *\n * @param {Object}\n * @api private\n */\nexport function encode(obj) {\n    let str = '';\n    for (let i in obj) {\n        if (obj.hasOwnProperty(i)) {\n            if (str.length)\n                str += '&';\n            str += encodeURIComponent(i) + '=' + encodeURIComponent(obj[i]);\n        }\n    }\n    return str;\n}\n/**\n * Parses a simple querystring into an object\n *\n * @param {String} qs\n * @api private\n */\nexport function decode(qs) {\n    let qry = {};\n    let pairs = qs.split('&');\n    for (let i = 0, l = pairs.length; i < l; i++) {\n        let pair = pairs[i].split('=');\n        qry[decodeURIComponent(pair[0])] = decodeURIComponent(pair[1]);\n    }\n    return qry;\n}\n","// imported from https://github.com/component/has-cors\nlet value = false;\ntry {\n    value = typeof XMLHttpRequest !== 'undefined' &&\n        'withCredentials' in new XMLHttpRequest();\n}\ncatch (err) {\n    // if XMLHttp support is disabled in IE then it will throw\n    // when trying to create\n}\nexport const hasCORS = value;\n","// browser shim for xmlhttprequest module\nimport { hasCORS } from \"../contrib/has-cors.js\";\nimport globalThis from \"../globalThis.js\";\nexport default function (opts) {\n    const xdomain = opts.xdomain;\n    // XMLHttpRequest can be disabled on IE\n    try {\n        if (\"undefined\" !== typeof XMLHttpRequest && (!xdomain || hasCORS)) {\n            return new XMLHttpRequest();\n        }\n    }\n    catch (e) { }\n    if (!xdomain) {\n        try {\n            return new globalThis[[\"Active\"].concat(\"Object\").join(\"X\")](\"Microsoft.XMLHTTP\");\n        }\n        catch (e) { }\n    }\n}\n","import { Transport } from \"../transport.js\";\nimport { yeast } from \"../contrib/yeast.js\";\nimport { encode } from \"../contrib/parseqs.js\";\nimport { encodePayload, decodePayload } from \"engine.io-parser\";\nimport XMLHttpRequest from \"./xmlhttprequest.js\";\nimport { Emitter } from \"@socket.io/component-emitter\";\nimport { installTimerFunctions, pick } from \"../util.js\";\nimport globalThis from \"../globalThis.js\";\nfunction empty() { }\nconst hasXHR2 = (function () {\n    const xhr = new XMLHttpRequest({\n        xdomain: false\n    });\n    return null != xhr.responseType;\n})();\nexport class Polling extends Transport {\n    /**\n     * XHR Polling constructor.\n     *\n     * @param {Object} opts\n     * @api public\n     */\n    constructor(opts) {\n        super(opts);\n        this.polling = false;\n        if (typeof location !== \"undefined\") {\n            const isSSL = \"https:\" === location.protocol;\n            let port = location.port;\n            // some user agents have empty `location.port`\n            if (!port) {\n                port = isSSL ? \"443\" : \"80\";\n            }\n            this.xd =\n                (typeof location !== \"undefined\" &&\n                    opts.hostname !== location.hostname) ||\n                    port !== opts.port;\n            this.xs = opts.secure !== isSSL;\n        }\n        /**\n         * XHR supports binary\n         */\n        const forceBase64 = opts && opts.forceBase64;\n        this.supportsBinary = hasXHR2 && !forceBase64;\n    }\n    /**\n     * Transport name.\n     */\n    get name() {\n        return \"polling\";\n    }\n    /**\n     * Opens the socket (triggers polling). We write a PING message to determine\n     * when the transport is open.\n     *\n     * @api private\n     */\n    doOpen() {\n        this.poll();\n    }\n    /**\n     * Pauses polling.\n     *\n     * @param {Function} callback upon buffers are flushed and transport is paused\n     * @api private\n     */\n    pause(onPause) {\n        this.readyState = \"pausing\";\n        const pause = () => {\n            this.readyState = \"paused\";\n            onPause();\n        };\n        if (this.polling || !this.writable) {\n            let total = 0;\n            if (this.polling) {\n                total++;\n                this.once(\"pollComplete\", function () {\n                    --total || pause();\n                });\n            }\n            if (!this.writable) {\n                total++;\n                this.once(\"drain\", function () {\n                    --total || pause();\n                });\n            }\n        }\n        else {\n            pause();\n        }\n    }\n    /**\n     * Starts polling cycle.\n     *\n     * @api public\n     */\n    poll() {\n        this.polling = true;\n        this.doPoll();\n        this.emitReserved(\"poll\");\n    }\n    /**\n     * Overloads onData to detect payloads.\n     *\n     * @api private\n     */\n    onData(data) {\n        const callback = packet => {\n            // if its the first message we consider the transport open\n            if (\"opening\" === this.readyState && packet.type === \"open\") {\n                this.onOpen();\n            }\n            // if its a close packet, we close the ongoing requests\n            if (\"close\" === packet.type) {\n                this.onClose({ description: \"transport closed by the server\" });\n                return false;\n            }\n            // otherwise bypass onData and handle the message\n            this.onPacket(packet);\n        };\n        // decode payload\n        decodePayload(data, this.socket.binaryType).forEach(callback);\n        // if an event did not trigger closing\n        if (\"closed\" !== this.readyState) {\n            // if we got data we're not polling\n            this.polling = false;\n            this.emitReserved(\"pollComplete\");\n            if (\"open\" === this.readyState) {\n                this.poll();\n            }\n            else {\n            }\n        }\n    }\n    /**\n     * For polling, send a close packet.\n     *\n     * @api private\n     */\n    doClose() {\n        const close = () => {\n            this.write([{ type: \"close\" }]);\n        };\n        if (\"open\" === this.readyState) {\n            close();\n        }\n        else {\n            // in case we're trying to close while\n            // handshaking is in progress (GH-164)\n            this.once(\"open\", close);\n        }\n    }\n    /**\n     * Writes a packets payload.\n     *\n     * @param {Array} data packets\n     * @param {Function} drain callback\n     * @api private\n     */\n    write(packets) {\n        this.writable = false;\n        encodePayload(packets, data => {\n            this.doWrite(data, () => {\n                this.writable = true;\n                this.emitReserved(\"drain\");\n            });\n        });\n    }\n    /**\n     * Generates uri for connection.\n     *\n     * @api private\n     */\n    uri() {\n        let query = this.query || {};\n        const schema = this.opts.secure ? \"https\" : \"http\";\n        let port = \"\";\n        // cache busting is forced\n        if (false !== this.opts.timestampRequests) {\n            query[this.opts.timestampParam] = yeast();\n        }\n        if (!this.supportsBinary && !query.sid) {\n            query.b64 = 1;\n        }\n        // avoid port if default for schema\n        if (this.opts.port &&\n            ((\"https\" === schema && Number(this.opts.port) !== 443) ||\n                (\"http\" === schema && Number(this.opts.port) !== 80))) {\n            port = \":\" + this.opts.port;\n        }\n        const encodedQuery = encode(query);\n        const ipv6 = this.opts.hostname.indexOf(\":\") !== -1;\n        return (schema +\n            \"://\" +\n            (ipv6 ? \"[\" + this.opts.hostname + \"]\" : this.opts.hostname) +\n            port +\n            this.opts.path +\n            (encodedQuery.length ? \"?\" + encodedQuery : \"\"));\n    }\n    /**\n     * Creates a request.\n     *\n     * @param {String} method\n     * @api private\n     */\n    request(opts = {}) {\n        Object.assign(opts, { xd: this.xd, xs: this.xs }, this.opts);\n        return new Request(this.uri(), opts);\n    }\n    /**\n     * Sends data.\n     *\n     * @param {String} data to send.\n     * @param {Function} called upon flush.\n     * @api private\n     */\n    doWrite(data, fn) {\n        const req = this.request({\n            method: \"POST\",\n            data: data\n        });\n        req.on(\"success\", fn);\n        req.on(\"error\", (xhrStatus, context) => {\n            this.onError(\"xhr post error\", xhrStatus, context);\n        });\n    }\n    /**\n     * Starts a poll cycle.\n     *\n     * @api private\n     */\n    doPoll() {\n        const req = this.request();\n        req.on(\"data\", this.onData.bind(this));\n        req.on(\"error\", (xhrStatus, context) => {\n            this.onError(\"xhr poll error\", xhrStatus, context);\n        });\n        this.pollXhr = req;\n    }\n}\nexport class Request extends Emitter {\n    /**\n     * Request constructor\n     *\n     * @param {Object} options\n     * @api public\n     */\n    constructor(uri, opts) {\n        super();\n        installTimerFunctions(this, opts);\n        this.opts = opts;\n        this.method = opts.method || \"GET\";\n        this.uri = uri;\n        this.async = false !== opts.async;\n        this.data = undefined !== opts.data ? opts.data : null;\n        this.create();\n    }\n    /**\n     * Creates the XHR object and sends the request.\n     *\n     * @api private\n     */\n    create() {\n        const opts = pick(this.opts, \"agent\", \"pfx\", \"key\", \"passphrase\", \"cert\", \"ca\", \"ciphers\", \"rejectUnauthorized\", \"autoUnref\");\n        opts.xdomain = !!this.opts.xd;\n        opts.xscheme = !!this.opts.xs;\n        const xhr = (this.xhr = new XMLHttpRequest(opts));\n        try {\n            xhr.open(this.method, this.uri, this.async);\n            try {\n                if (this.opts.extraHeaders) {\n                    xhr.setDisableHeaderCheck && xhr.setDisableHeaderCheck(true);\n                    for (let i in this.opts.extraHeaders) {\n                        if (this.opts.extraHeaders.hasOwnProperty(i)) {\n                            xhr.setRequestHeader(i, this.opts.extraHeaders[i]);\n                        }\n                    }\n                }\n            }\n            catch (e) { }\n            if (\"POST\" === this.method) {\n                try {\n                    xhr.setRequestHeader(\"Content-type\", \"text/plain;charset=UTF-8\");\n                }\n                catch (e) { }\n            }\n            try {\n                xhr.setRequestHeader(\"Accept\", \"*/*\");\n            }\n            catch (e) { }\n            // ie6 check\n            if (\"withCredentials\" in xhr) {\n                xhr.withCredentials = this.opts.withCredentials;\n            }\n            if (this.opts.requestTimeout) {\n                xhr.timeout = this.opts.requestTimeout;\n            }\n            xhr.onreadystatechange = () => {\n                if (4 !== xhr.readyState)\n                    return;\n                if (200 === xhr.status || 1223 === xhr.status) {\n                    this.onLoad();\n                }\n                else {\n                    // make sure the `error` event handler that's user-set\n                    // does not throw in the same tick and gets caught here\n                    this.setTimeoutFn(() => {\n                        this.onError(typeof xhr.status === \"number\" ? xhr.status : 0);\n                    }, 0);\n                }\n            };\n            xhr.send(this.data);\n        }\n        catch (e) {\n            // Need to defer since .create() is called directly from the constructor\n            // and thus the 'error' event can only be only bound *after* this exception\n            // occurs.  Therefore, also, we cannot throw here at all.\n            this.setTimeoutFn(() => {\n                this.onError(e);\n            }, 0);\n            return;\n        }\n        if (typeof document !== \"undefined\") {\n            this.index = Request.requestsCount++;\n            Request.requests[this.index] = this;\n        }\n    }\n    /**\n     * Called upon error.\n     *\n     * @api private\n     */\n    onError(err) {\n        this.emitReserved(\"error\", err, this.xhr);\n        this.cleanup(true);\n    }\n    /**\n     * Cleans up house.\n     *\n     * @api private\n     */\n    cleanup(fromError) {\n        if (\"undefined\" === typeof this.xhr || null === this.xhr) {\n            return;\n        }\n        this.xhr.onreadystatechange = empty;\n        if (fromError) {\n            try {\n                this.xhr.abort();\n            }\n            catch (e) { }\n        }\n        if (typeof document !== \"undefined\") {\n            delete Request.requests[this.index];\n        }\n        this.xhr = null;\n    }\n    /**\n     * Called upon load.\n     *\n     * @api private\n     */\n    onLoad() {\n        const data = this.xhr.responseText;\n        if (data !== null) {\n            this.emitReserved(\"data\", data);\n            this.emitReserved(\"success\");\n            this.cleanup();\n        }\n    }\n    /**\n     * Aborts the request.\n     *\n     * @api public\n     */\n    abort() {\n        this.cleanup();\n    }\n}\nRequest.requestsCount = 0;\nRequest.requests = {};\n/**\n * Aborts pending requests when unloading the window. This is needed to prevent\n * memory leaks (e.g. when using IE) and to ensure that no spurious error is\n * emitted.\n */\nif (typeof document !== \"undefined\") {\n    // @ts-ignore\n    if (typeof attachEvent === \"function\") {\n        // @ts-ignore\n        attachEvent(\"onunload\", unloadHandler);\n    }\n    else if (typeof addEventListener === \"function\") {\n        const terminationEvent = \"onpagehide\" in globalThis ? \"pagehide\" : \"unload\";\n        addEventListener(terminationEvent, unloadHandler, false);\n    }\n}\nfunction unloadHandler() {\n    for (let i in Request.requests) {\n        if (Request.requests.hasOwnProperty(i)) {\n            Request.requests[i].abort();\n        }\n    }\n}\n","import globalThis from \"../globalThis.js\";\nexport const nextTick = (() => {\n    const isPromiseAvailable = typeof Promise === \"function\" && typeof Promise.resolve === \"function\";\n    if (isPromiseAvailable) {\n        return cb => Promise.resolve().then(cb);\n    }\n    else {\n        return (cb, setTimeoutFn) => setTimeoutFn(cb, 0);\n    }\n})();\nexport const WebSocket = globalThis.WebSocket || globalThis.MozWebSocket;\nexport const usingBrowserWebSocket = true;\nexport const defaultBinaryType = \"arraybuffer\";\n","import { Transport } from \"../transport.js\";\nimport { encode } from \"../contrib/parseqs.js\";\nimport { yeast } from \"../contrib/yeast.js\";\nimport { pick } from \"../util.js\";\nimport { defaultBinaryType, nextTick, usingBrowserWebSocket, WebSocket } from \"./websocket-constructor.js\";\nimport { encodePacket } from \"engine.io-parser\";\n// detect ReactNative environment\nconst isReactNative = typeof navigator !== \"undefined\" &&\n    typeof navigator.product === \"string\" &&\n    navigator.product.toLowerCase() === \"reactnative\";\nexport class WS extends Transport {\n    /**\n     * WebSocket transport constructor.\n     *\n     * @api {Object} connection options\n     * @api public\n     */\n    constructor(opts) {\n        super(opts);\n        this.supportsBinary = !opts.forceBase64;\n    }\n    /**\n     * Transport name.\n     *\n     * @api public\n     */\n    get name() {\n        return \"websocket\";\n    }\n    /**\n     * Opens socket.\n     *\n     * @api private\n     */\n    doOpen() {\n        if (!this.check()) {\n            // let probe timeout\n            return;\n        }\n        const uri = this.uri();\n        const protocols = this.opts.protocols;\n        // React Native only supports the 'headers' option, and will print a warning if anything else is passed\n        const opts = isReactNative\n            ? {}\n            : pick(this.opts, \"agent\", \"perMessageDeflate\", \"pfx\", \"key\", \"passphrase\", \"cert\", \"ca\", \"ciphers\", \"rejectUnauthorized\", \"localAddress\", \"protocolVersion\", \"origin\", \"maxPayload\", \"family\", \"checkServerIdentity\");\n        if (this.opts.extraHeaders) {\n            opts.headers = this.opts.extraHeaders;\n        }\n        try {\n            this.ws =\n                usingBrowserWebSocket && !isReactNative\n                    ? protocols\n                        ? new WebSocket(uri, protocols)\n                        : new WebSocket(uri)\n                    : new WebSocket(uri, protocols, opts);\n        }\n        catch (err) {\n            return this.emitReserved(\"error\", err);\n        }\n        this.ws.binaryType = this.socket.binaryType || defaultBinaryType;\n        this.addEventListeners();\n    }\n    /**\n     * Adds event listeners to the socket\n     *\n     * @api private\n     */\n    addEventListeners() {\n        this.ws.onopen = () => {\n            if (this.opts.autoUnref) {\n                this.ws._socket.unref();\n            }\n            this.onOpen();\n        };\n        this.ws.onclose = closeEvent => this.onClose({\n            description: \"websocket connection closed\",\n            context: closeEvent\n        });\n        this.ws.onmessage = ev => this.onData(ev.data);\n        this.ws.onerror = e => this.onError(\"websocket error\", e);\n    }\n    /**\n     * Writes data to socket.\n     *\n     * @param {Array} array of packets.\n     * @api private\n     */\n    write(packets) {\n        this.writable = false;\n        // encodePacket efficient as it uses WS framing\n        // no need for encodePayload\n        for (let i = 0; i < packets.length; i++) {\n            const packet = packets[i];\n            const lastPacket = i === packets.length - 1;\n            encodePacket(packet, this.supportsBinary, data => {\n                // always create a new object (GH-437)\n                const opts = {};\n                if (!usingBrowserWebSocket) {\n                    if (packet.options) {\n                        opts.compress = packet.options.compress;\n                    }\n                    if (this.opts.perMessageDeflate) {\n                        const len = \n                        // @ts-ignore\n                        \"string\" === typeof data ? Buffer.byteLength(data) : data.length;\n                        if (len < this.opts.perMessageDeflate.threshold) {\n                            opts.compress = false;\n                        }\n                    }\n                }\n                // Sometimes the websocket has already been closed but the browser didn't\n                // have a chance of informing us about it yet, in that case send will\n                // throw an error\n                try {\n                    if (usingBrowserWebSocket) {\n                        // TypeError is thrown when passing the second argument on Safari\n                        this.ws.send(data);\n                    }\n                    else {\n                        this.ws.send(data, opts);\n                    }\n                }\n                catch (e) {\n                }\n                if (lastPacket) {\n                    // fake drain\n                    // defer to next tick to allow Socket to clear writeBuffer\n                    nextTick(() => {\n                        this.writable = true;\n                        this.emitReserved(\"drain\");\n                    }, this.setTimeoutFn);\n                }\n            });\n        }\n    }\n    /**\n     * Closes socket.\n     *\n     * @api private\n     */\n    doClose() {\n        if (typeof this.ws !== \"undefined\") {\n            this.ws.close();\n            this.ws = null;\n        }\n    }\n    /**\n     * Generates uri for connection.\n     *\n     * @api private\n     */\n    uri() {\n        let query = this.query || {};\n        const schema = this.opts.secure ? \"wss\" : \"ws\";\n        let port = \"\";\n        // avoid port if default for schema\n        if (this.opts.port &&\n            ((\"wss\" === schema && Number(this.opts.port) !== 443) ||\n                (\"ws\" === schema && Number(this.opts.port) !== 80))) {\n            port = \":\" + this.opts.port;\n        }\n        // append timestamp to URI\n        if (this.opts.timestampRequests) {\n            query[this.opts.timestampParam] = yeast();\n        }\n        // communicate binary support capabilities\n        if (!this.supportsBinary) {\n            query.b64 = 1;\n        }\n        const encodedQuery = encode(query);\n        const ipv6 = this.opts.hostname.indexOf(\":\") !== -1;\n        return (schema +\n            \"://\" +\n            (ipv6 ? \"[\" + this.opts.hostname + \"]\" : this.opts.hostname) +\n            port +\n            this.opts.path +\n            (encodedQuery.length ? \"?\" + encodedQuery : \"\"));\n    }\n    /**\n     * Feature detection for WebSocket.\n     *\n     * @return {Boolean} whether this transport is available.\n     * @api public\n     */\n    check() {\n        return (!!WebSocket &&\n            !(\"__initialize\" in WebSocket && this.name === WS.prototype.name));\n    }\n}\n","import { Polling } from \"./polling.js\";\nimport { WS } from \"./websocket.js\";\nexport const transports = {\n    websocket: WS,\n    polling: Polling\n};\n","// imported from https://github.com/galkn/parseuri\n/**\n * Parses an URI\n *\n * @author Steven Levithan <stevenlevithan.com> (MIT license)\n * @api private\n */\nconst re = /^(?:(?![^:@]+:[^:@\\/]*@)(http|https|ws|wss):\\/\\/)?((?:(([^:@]*)(?::([^:@]*))?)?@)?((?:[a-f0-9]{0,4}:){2,7}[a-f0-9]{0,4}|[^:\\/?#]*)(?::(\\d*))?)(((\\/(?:[^?#](?![^?#\\/]*\\.[^?#\\/.]+(?:[?#]|$)))*\\/?)?([^?#\\/]*))(?:\\?([^#]*))?(?:#(.*))?)/;\nconst parts = [\n    'source', 'protocol', 'authority', 'userInfo', 'user', 'password', 'host', 'port', 'relative', 'path', 'directory', 'file', 'query', 'anchor'\n];\nexport function parse(str) {\n    const src = str, b = str.indexOf('['), e = str.indexOf(']');\n    if (b != -1 && e != -1) {\n        str = str.substring(0, b) + str.substring(b, e).replace(/:/g, ';') + str.substring(e, str.length);\n    }\n    let m = re.exec(str || ''), uri = {}, i = 14;\n    while (i--) {\n        uri[parts[i]] = m[i] || '';\n    }\n    if (b != -1 && e != -1) {\n        uri.source = src;\n        uri.host = uri.host.substring(1, uri.host.length - 1).replace(/;/g, ':');\n        uri.authority = uri.authority.replace('[', '').replace(']', '').replace(/;/g, ':');\n        uri.ipv6uri = true;\n    }\n    uri.pathNames = pathNames(uri, uri['path']);\n    uri.queryKey = queryKey(uri, uri['query']);\n    return uri;\n}\nfunction pathNames(obj, path) {\n    const regx = /\\/{2,9}/g, names = path.replace(regx, \"/\").split(\"/\");\n    if (path.substr(0, 1) == '/' || path.length === 0) {\n        names.splice(0, 1);\n    }\n    if (path.substr(path.length - 1, 1) == '/') {\n        names.splice(names.length - 1, 1);\n    }\n    return names;\n}\nfunction queryKey(uri, query) {\n    const data = {};\n    query.replace(/(?:^|&)([^&=]*)=?([^&]*)/g, function ($0, $1, $2) {\n        if ($1) {\n            data[$1] = $2;\n        }\n    });\n    return data;\n}\n","import { transports } from \"./transports/index.js\";\nimport { installTimerFunctions, byteLength } from \"./util.js\";\nimport { decode } from \"./contrib/parseqs.js\";\nimport { parse } from \"./contrib/parseuri.js\";\nimport { Emitter } from \"@socket.io/component-emitter\";\nimport { protocol } from \"engine.io-parser\";\nexport class Socket extends Emitter {\n    /**\n     * Socket constructor.\n     *\n     * @param {String|Object} uri or options\n     * @param {Object} opts - options\n     * @api public\n     */\n    constructor(uri, opts = {}) {\n        super();\n        if (uri && \"object\" === typeof uri) {\n            opts = uri;\n            uri = null;\n        }\n        if (uri) {\n            uri = parse(uri);\n            opts.hostname = uri.host;\n            opts.secure = uri.protocol === \"https\" || uri.protocol === \"wss\";\n            opts.port = uri.port;\n            if (uri.query)\n                opts.query = uri.query;\n        }\n        else if (opts.host) {\n            opts.hostname = parse(opts.host).host;\n        }\n        installTimerFunctions(this, opts);\n        this.secure =\n            null != opts.secure\n                ? opts.secure\n                : typeof location !== \"undefined\" && \"https:\" === location.protocol;\n        if (opts.hostname && !opts.port) {\n            // if no port is specified manually, use the protocol default\n            opts.port = this.secure ? \"443\" : \"80\";\n        }\n        this.hostname =\n            opts.hostname ||\n                (typeof location !== \"undefined\" ? location.hostname : \"localhost\");\n        this.port =\n            opts.port ||\n                (typeof location !== \"undefined\" && location.port\n                    ? location.port\n                    : this.secure\n                        ? \"443\"\n                        : \"80\");\n        this.transports = opts.transports || [\"polling\", \"websocket\"];\n        this.readyState = \"\";\n        this.writeBuffer = [];\n        this.prevBufferLen = 0;\n        this.opts = Object.assign({\n            path: \"/engine.io\",\n            agent: false,\n            withCredentials: false,\n            upgrade: true,\n            timestampParam: \"t\",\n            rememberUpgrade: false,\n            rejectUnauthorized: true,\n            perMessageDeflate: {\n                threshold: 1024\n            },\n            transportOptions: {},\n            closeOnBeforeunload: true\n        }, opts);\n        this.opts.path = this.opts.path.replace(/\\/$/, \"\") + \"/\";\n        if (typeof this.opts.query === \"string\") {\n            this.opts.query = decode(this.opts.query);\n        }\n        // set on handshake\n        this.id = null;\n        this.upgrades = null;\n        this.pingInterval = null;\n        this.pingTimeout = null;\n        // set on heartbeat\n        this.pingTimeoutTimer = null;\n        if (typeof addEventListener === \"function\") {\n            if (this.opts.closeOnBeforeunload) {\n                // Firefox closes the connection when the \"beforeunload\" event is emitted but not Chrome. This event listener\n                // ensures every browser behaves the same (no \"disconnect\" event at the Socket.IO level when the page is\n                // closed/reloaded)\n                addEventListener(\"beforeunload\", () => {\n                    if (this.transport) {\n                        // silently close the transport\n                        this.transport.removeAllListeners();\n                        this.transport.close();\n                    }\n                }, false);\n            }\n            if (this.hostname !== \"localhost\") {\n                this.offlineEventListener = () => {\n                    this.onClose(\"transport close\", {\n                        description: \"network connection lost\"\n                    });\n                };\n                addEventListener(\"offline\", this.offlineEventListener, false);\n            }\n        }\n        this.open();\n    }\n    /**\n     * Creates transport of the given type.\n     *\n     * @param {String} transport name\n     * @return {Transport}\n     * @api private\n     */\n    createTransport(name) {\n        const query = Object.assign({}, this.opts.query);\n        // append engine.io protocol identifier\n        query.EIO = protocol;\n        // transport name\n        query.transport = name;\n        // session id if we already have one\n        if (this.id)\n            query.sid = this.id;\n        const opts = Object.assign({}, this.opts.transportOptions[name], this.opts, {\n            query,\n            socket: this,\n            hostname: this.hostname,\n            secure: this.secure,\n            port: this.port\n        });\n        return new transports[name](opts);\n    }\n    /**\n     * Initializes transport to use and starts probe.\n     *\n     * @api private\n     */\n    open() {\n        let transport;\n        if (this.opts.rememberUpgrade &&\n            Socket.priorWebsocketSuccess &&\n            this.transports.indexOf(\"websocket\") !== -1) {\n            transport = \"websocket\";\n        }\n        else if (0 === this.transports.length) {\n            // Emit error on next tick so it can be listened to\n            this.setTimeoutFn(() => {\n                this.emitReserved(\"error\", \"No transports available\");\n            }, 0);\n            return;\n        }\n        else {\n            transport = this.transports[0];\n        }\n        this.readyState = \"opening\";\n        // Retry with the next transport if the transport is disabled (jsonp: false)\n        try {\n            transport = this.createTransport(transport);\n        }\n        catch (e) {\n            this.transports.shift();\n            this.open();\n            return;\n        }\n        transport.open();\n        this.setTransport(transport);\n    }\n    /**\n     * Sets the current transport. Disables the existing one (if any).\n     *\n     * @api private\n     */\n    setTransport(transport) {\n        if (this.transport) {\n            this.transport.removeAllListeners();\n        }\n        // set up transport\n        this.transport = transport;\n        // set up transport listeners\n        transport\n            .on(\"drain\", this.onDrain.bind(this))\n            .on(\"packet\", this.onPacket.bind(this))\n            .on(\"error\", this.onError.bind(this))\n            .on(\"close\", reason => this.onClose(\"transport close\", reason));\n    }\n    /**\n     * Probes a transport.\n     *\n     * @param {String} transport name\n     * @api private\n     */\n    probe(name) {\n        let transport = this.createTransport(name);\n        let failed = false;\n        Socket.priorWebsocketSuccess = false;\n        const onTransportOpen = () => {\n            if (failed)\n                return;\n            transport.send([{ type: \"ping\", data: \"probe\" }]);\n            transport.once(\"packet\", msg => {\n                if (failed)\n                    return;\n                if (\"pong\" === msg.type && \"probe\" === msg.data) {\n                    this.upgrading = true;\n                    this.emitReserved(\"upgrading\", transport);\n                    if (!transport)\n                        return;\n                    Socket.priorWebsocketSuccess = \"websocket\" === transport.name;\n                    this.transport.pause(() => {\n                        if (failed)\n                            return;\n                        if (\"closed\" === this.readyState)\n                            return;\n                        cleanup();\n                        this.setTransport(transport);\n                        transport.send([{ type: \"upgrade\" }]);\n                        this.emitReserved(\"upgrade\", transport);\n                        transport = null;\n                        this.upgrading = false;\n                        this.flush();\n                    });\n                }\n                else {\n                    const err = new Error(\"probe error\");\n                    // @ts-ignore\n                    err.transport = transport.name;\n                    this.emitReserved(\"upgradeError\", err);\n                }\n            });\n        };\n        function freezeTransport() {\n            if (failed)\n                return;\n            // Any callback called by transport should be ignored since now\n            failed = true;\n            cleanup();\n            transport.close();\n            transport = null;\n        }\n        // Handle any error that happens while probing\n        const onerror = err => {\n            const error = new Error(\"probe error: \" + err);\n            // @ts-ignore\n            error.transport = transport.name;\n            freezeTransport();\n            this.emitReserved(\"upgradeError\", error);\n        };\n        function onTransportClose() {\n            onerror(\"transport closed\");\n        }\n        // When the socket is closed while we're probing\n        function onclose() {\n            onerror(\"socket closed\");\n        }\n        // When the socket is upgraded while we're probing\n        function onupgrade(to) {\n            if (transport && to.name !== transport.name) {\n                freezeTransport();\n            }\n        }\n        // Remove all listeners on the transport and on self\n        const cleanup = () => {\n            transport.removeListener(\"open\", onTransportOpen);\n            transport.removeListener(\"error\", onerror);\n            transport.removeListener(\"close\", onTransportClose);\n            this.off(\"close\", onclose);\n            this.off(\"upgrading\", onupgrade);\n        };\n        transport.once(\"open\", onTransportOpen);\n        transport.once(\"error\", onerror);\n        transport.once(\"close\", onTransportClose);\n        this.once(\"close\", onclose);\n        this.once(\"upgrading\", onupgrade);\n        transport.open();\n    }\n    /**\n     * Called when connection is deemed open.\n     *\n     * @api private\n     */\n    onOpen() {\n        this.readyState = \"open\";\n        Socket.priorWebsocketSuccess = \"websocket\" === this.transport.name;\n        this.emitReserved(\"open\");\n        this.flush();\n        // we check for `readyState` in case an `open`\n        // listener already closed the socket\n        if (\"open\" === this.readyState &&\n            this.opts.upgrade &&\n            this.transport.pause) {\n            let i = 0;\n            const l = this.upgrades.length;\n            for (; i < l; i++) {\n                this.probe(this.upgrades[i]);\n            }\n        }\n    }\n    /**\n     * Handles a packet.\n     *\n     * @api private\n     */\n    onPacket(packet) {\n        if (\"opening\" === this.readyState ||\n            \"open\" === this.readyState ||\n            \"closing\" === this.readyState) {\n            this.emitReserved(\"packet\", packet);\n            // Socket is live - any packet counts\n            this.emitReserved(\"heartbeat\");\n            switch (packet.type) {\n                case \"open\":\n                    this.onHandshake(JSON.parse(packet.data));\n                    break;\n                case \"ping\":\n                    this.resetPingTimeout();\n                    this.sendPacket(\"pong\");\n                    this.emitReserved(\"ping\");\n                    this.emitReserved(\"pong\");\n                    break;\n                case \"error\":\n                    const err = new Error(\"server error\");\n                    // @ts-ignore\n                    err.code = packet.data;\n                    this.onError(err);\n                    break;\n                case \"message\":\n                    this.emitReserved(\"data\", packet.data);\n                    this.emitReserved(\"message\", packet.data);\n                    break;\n            }\n        }\n        else {\n        }\n    }\n    /**\n     * Called upon handshake completion.\n     *\n     * @param {Object} data - handshake obj\n     * @api private\n     */\n    onHandshake(data) {\n        this.emitReserved(\"handshake\", data);\n        this.id = data.sid;\n        this.transport.query.sid = data.sid;\n        this.upgrades = this.filterUpgrades(data.upgrades);\n        this.pingInterval = data.pingInterval;\n        this.pingTimeout = data.pingTimeout;\n        this.maxPayload = data.maxPayload;\n        this.onOpen();\n        // In case open handler closes socket\n        if (\"closed\" === this.readyState)\n            return;\n        this.resetPingTimeout();\n    }\n    /**\n     * Sets and resets ping timeout timer based on server pings.\n     *\n     * @api private\n     */\n    resetPingTimeout() {\n        this.clearTimeoutFn(this.pingTimeoutTimer);\n        this.pingTimeoutTimer = this.setTimeoutFn(() => {\n            this.onClose(\"ping timeout\");\n        }, this.pingInterval + this.pingTimeout);\n        if (this.opts.autoUnref) {\n            this.pingTimeoutTimer.unref();\n        }\n    }\n    /**\n     * Called on `drain` event\n     *\n     * @api private\n     */\n    onDrain() {\n        this.writeBuffer.splice(0, this.prevBufferLen);\n        // setting prevBufferLen = 0 is very important\n        // for example, when upgrading, upgrade packet is sent over,\n        // and a nonzero prevBufferLen could cause problems on `drain`\n        this.prevBufferLen = 0;\n        if (0 === this.writeBuffer.length) {\n            this.emitReserved(\"drain\");\n        }\n        else {\n            this.flush();\n        }\n    }\n    /**\n     * Flush write buffers.\n     *\n     * @api private\n     */\n    flush() {\n        if (\"closed\" !== this.readyState &&\n            this.transport.writable &&\n            !this.upgrading &&\n            this.writeBuffer.length) {\n            const packets = this.getWritablePackets();\n            this.transport.send(packets);\n            // keep track of current length of writeBuffer\n            // splice writeBuffer and callbackBuffer on `drain`\n            this.prevBufferLen = packets.length;\n            this.emitReserved(\"flush\");\n        }\n    }\n    /**\n     * Ensure the encoded size of the writeBuffer is below the maxPayload value sent by the server (only for HTTP\n     * long-polling)\n     *\n     * @private\n     */\n    getWritablePackets() {\n        const shouldCheckPayloadSize = this.maxPayload &&\n            this.transport.name === \"polling\" &&\n            this.writeBuffer.length > 1;\n        if (!shouldCheckPayloadSize) {\n            return this.writeBuffer;\n        }\n        let payloadSize = 1; // first packet type\n        for (let i = 0; i < this.writeBuffer.length; i++) {\n            const data = this.writeBuffer[i].data;\n            if (data) {\n                payloadSize += byteLength(data);\n            }\n            if (i > 0 && payloadSize > this.maxPayload) {\n                return this.writeBuffer.slice(0, i);\n            }\n            payloadSize += 2; // separator + packet type\n        }\n        return this.writeBuffer;\n    }\n    /**\n     * Sends a message.\n     *\n     * @param {String} message.\n     * @param {Function} callback function.\n     * @param {Object} options.\n     * @return {Socket} for chaining.\n     * @api public\n     */\n    write(msg, options, fn) {\n        this.sendPacket(\"message\", msg, options, fn);\n        return this;\n    }\n    send(msg, options, fn) {\n        this.sendPacket(\"message\", msg, options, fn);\n        return this;\n    }\n    /**\n     * Sends a packet.\n     *\n     * @param {String} packet type.\n     * @param {String} data.\n     * @param {Object} options.\n     * @param {Function} callback function.\n     * @api private\n     */\n    sendPacket(type, data, options, fn) {\n        if (\"function\" === typeof data) {\n            fn = data;\n            data = undefined;\n        }\n        if (\"function\" === typeof options) {\n            fn = options;\n            options = null;\n        }\n        if (\"closing\" === this.readyState || \"closed\" === this.readyState) {\n            return;\n        }\n        options = options || {};\n        options.compress = false !== options.compress;\n        const packet = {\n            type: type,\n            data: data,\n            options: options\n        };\n        this.emitReserved(\"packetCreate\", packet);\n        this.writeBuffer.push(packet);\n        if (fn)\n            this.once(\"flush\", fn);\n        this.flush();\n    }\n    /**\n     * Closes the connection.\n     *\n     * @api public\n     */\n    close() {\n        const close = () => {\n            this.onClose(\"forced close\");\n            this.transport.close();\n        };\n        const cleanupAndClose = () => {\n            this.off(\"upgrade\", cleanupAndClose);\n            this.off(\"upgradeError\", cleanupAndClose);\n            close();\n        };\n        const waitForUpgrade = () => {\n            // wait for upgrade to finish since we can't send packets while pausing a transport\n            this.once(\"upgrade\", cleanupAndClose);\n            this.once(\"upgradeError\", cleanupAndClose);\n        };\n        if (\"opening\" === this.readyState || \"open\" === this.readyState) {\n            this.readyState = \"closing\";\n            if (this.writeBuffer.length) {\n                this.once(\"drain\", () => {\n                    if (this.upgrading) {\n                        waitForUpgrade();\n                    }\n                    else {\n                        close();\n                    }\n                });\n            }\n            else if (this.upgrading) {\n                waitForUpgrade();\n            }\n            else {\n                close();\n            }\n        }\n        return this;\n    }\n    /**\n     * Called upon transport error\n     *\n     * @api private\n     */\n    onError(err) {\n        Socket.priorWebsocketSuccess = false;\n        this.emitReserved(\"error\", err);\n        this.onClose(\"transport error\", err);\n    }\n    /**\n     * Called upon transport close.\n     *\n     * @api private\n     */\n    onClose(reason, description) {\n        if (\"opening\" === this.readyState ||\n            \"open\" === this.readyState ||\n            \"closing\" === this.readyState) {\n            // clear timers\n            this.clearTimeoutFn(this.pingTimeoutTimer);\n            // stop event from firing again for transport\n            this.transport.removeAllListeners(\"close\");\n            // ensure transport won't stay open\n            this.transport.close();\n            // ignore further transport communication\n            this.transport.removeAllListeners();\n            if (typeof removeEventListener === \"function\") {\n                removeEventListener(\"offline\", this.offlineEventListener, false);\n            }\n            // set ready state\n            this.readyState = \"closed\";\n            // clear session id\n            this.id = null;\n            // emit close event\n            this.emitReserved(\"close\", reason, description);\n            // clean buffers after, so users can still\n            // grab the buffers on `close` event\n            this.writeBuffer = [];\n            this.prevBufferLen = 0;\n        }\n    }\n    /**\n     * Filters upgrades, returning only those matching client transports.\n     *\n     * @param {Array} server upgrades\n     * @api private\n     *\n     */\n    filterUpgrades(upgrades) {\n        const filteredUpgrades = [];\n        let i = 0;\n        const j = upgrades.length;\n        for (; i < j; i++) {\n            if (~this.transports.indexOf(upgrades[i]))\n                filteredUpgrades.push(upgrades[i]);\n        }\n        return filteredUpgrades;\n    }\n}\nSocket.protocol = protocol;\n","import { parse } from \"engine.io-client\";\n/**\n * URL parser.\n *\n * @param uri - url\n * @param path - the request path of the connection\n * @param loc - An object meant to mimic window.location.\n *        Defaults to window.location.\n * @public\n */\nexport function url(uri, path = \"\", loc) {\n    let obj = uri;\n    // default to window.location\n    loc = loc || (typeof location !== \"undefined\" && location);\n    if (null == uri)\n        uri = loc.protocol + \"//\" + loc.host;\n    // relative path support\n    if (typeof uri === \"string\") {\n        if (\"/\" === uri.charAt(0)) {\n            if (\"/\" === uri.charAt(1)) {\n                uri = loc.protocol + uri;\n            }\n            else {\n                uri = loc.host + uri;\n            }\n        }\n        if (!/^(https?|wss?):\\/\\//.test(uri)) {\n            if (\"undefined\" !== typeof loc) {\n                uri = loc.protocol + \"//\" + uri;\n            }\n            else {\n                uri = \"https://\" + uri;\n            }\n        }\n        // parse\n        obj = parse(uri);\n    }\n    // make sure we treat `localhost:80` and `localhost` equally\n    if (!obj.port) {\n        if (/^(http|ws)$/.test(obj.protocol)) {\n            obj.port = \"80\";\n        }\n        else if (/^(http|ws)s$/.test(obj.protocol)) {\n            obj.port = \"443\";\n        }\n    }\n    obj.path = obj.path || \"/\";\n    const ipv6 = obj.host.indexOf(\":\") !== -1;\n    const host = ipv6 ? \"[\" + obj.host + \"]\" : obj.host;\n    // define unique id\n    obj.id = obj.protocol + \"://\" + host + \":\" + obj.port + path;\n    // define href\n    obj.href =\n        obj.protocol +\n            \"://\" +\n            host +\n            (loc && loc.port === obj.port ? \"\" : \":\" + obj.port);\n    return obj;\n}\n","const withNativeArrayBuffer = typeof ArrayBuffer === \"function\";\nconst isView = (obj) => {\n    return typeof ArrayBuffer.isView === \"function\"\n        ? ArrayBuffer.isView(obj)\n        : obj.buffer instanceof ArrayBuffer;\n};\nconst toString = Object.prototype.toString;\nconst withNativeBlob = typeof Blob === \"function\" ||\n    (typeof Blob !== \"undefined\" &&\n        toString.call(Blob) === \"[object BlobConstructor]\");\nconst withNativeFile = typeof File === \"function\" ||\n    (typeof File !== \"undefined\" &&\n        toString.call(File) === \"[object FileConstructor]\");\n/**\n * Returns true if obj is a Buffer, an ArrayBuffer, a Blob or a File.\n *\n * @private\n */\nexport function isBinary(obj) {\n    return ((withNativeArrayBuffer && (obj instanceof ArrayBuffer || isView(obj))) ||\n        (withNativeBlob && obj instanceof Blob) ||\n        (withNativeFile && obj instanceof File));\n}\nexport function hasBinary(obj, toJSON) {\n    if (!obj || typeof obj !== \"object\") {\n        return false;\n    }\n    if (Array.isArray(obj)) {\n        for (let i = 0, l = obj.length; i < l; i++) {\n            if (hasBinary(obj[i])) {\n                return true;\n            }\n        }\n        return false;\n    }\n    if (isBinary(obj)) {\n        return true;\n    }\n    if (obj.toJSON &&\n        typeof obj.toJSON === \"function\" &&\n        arguments.length === 1) {\n        return hasBinary(obj.toJSON(), true);\n    }\n    for (const key in obj) {\n        if (Object.prototype.hasOwnProperty.call(obj, key) && hasBinary(obj[key])) {\n            return true;\n        }\n    }\n    return false;\n}\n","import { isBinary } from \"./is-binary.js\";\n/**\n * Replaces every Buffer | ArrayBuffer | Blob | File in packet with a numbered placeholder.\n *\n * @param {Object} packet - socket.io event packet\n * @return {Object} with deconstructed packet and list of buffers\n * @public\n */\nexport function deconstructPacket(packet) {\n    const buffers = [];\n    const packetData = packet.data;\n    const pack = packet;\n    pack.data = _deconstructPacket(packetData, buffers);\n    pack.attachments = buffers.length; // number of binary 'attachments'\n    return { packet: pack, buffers: buffers };\n}\nfunction _deconstructPacket(data, buffers) {\n    if (!data)\n        return data;\n    if (isBinary(data)) {\n        const placeholder = { _placeholder: true, num: buffers.length };\n        buffers.push(data);\n        return placeholder;\n    }\n    else if (Array.isArray(data)) {\n        const newData = new Array(data.length);\n        for (let i = 0; i < data.length; i++) {\n            newData[i] = _deconstructPacket(data[i], buffers);\n        }\n        return newData;\n    }\n    else if (typeof data === \"object\" && !(data instanceof Date)) {\n        const newData = {};\n        for (const key in data) {\n            if (Object.prototype.hasOwnProperty.call(data, key)) {\n                newData[key] = _deconstructPacket(data[key], buffers);\n            }\n        }\n        return newData;\n    }\n    return data;\n}\n/**\n * Reconstructs a binary packet from its placeholder packet and buffers\n *\n * @param {Object} packet - event packet with placeholders\n * @param {Array} buffers - binary buffers to put in placeholder positions\n * @return {Object} reconstructed packet\n * @public\n */\nexport function reconstructPacket(packet, buffers) {\n    packet.data = _reconstructPacket(packet.data, buffers);\n    packet.attachments = undefined; // no longer useful\n    return packet;\n}\nfunction _reconstructPacket(data, buffers) {\n    if (!data)\n        return data;\n    if (data && data._placeholder) {\n        return buffers[data.num]; // appropriate buffer (should be natural order anyway)\n    }\n    else if (Array.isArray(data)) {\n        for (let i = 0; i < data.length; i++) {\n            data[i] = _reconstructPacket(data[i], buffers);\n        }\n    }\n    else if (typeof data === \"object\") {\n        for (const key in data) {\n            if (Object.prototype.hasOwnProperty.call(data, key)) {\n                data[key] = _reconstructPacket(data[key], buffers);\n            }\n        }\n    }\n    return data;\n}\n","import { Emitter } from \"@socket.io/component-emitter\";\nimport { deconstructPacket, reconstructPacket } from \"./binary.js\";\nimport { isBinary, hasBinary } from \"./is-binary.js\";\n/**\n * Protocol version.\n *\n * @public\n */\nexport const protocol = 5;\nexport var PacketType;\n(function (PacketType) {\n    PacketType[PacketType[\"CONNECT\"] = 0] = \"CONNECT\";\n    PacketType[PacketType[\"DISCONNECT\"] = 1] = \"DISCONNECT\";\n    PacketType[PacketType[\"EVENT\"] = 2] = \"EVENT\";\n    PacketType[PacketType[\"ACK\"] = 3] = \"ACK\";\n    PacketType[PacketType[\"CONNECT_ERROR\"] = 4] = \"CONNECT_ERROR\";\n    PacketType[PacketType[\"BINARY_EVENT\"] = 5] = \"BINARY_EVENT\";\n    PacketType[PacketType[\"BINARY_ACK\"] = 6] = \"BINARY_ACK\";\n})(PacketType || (PacketType = {}));\n/**\n * A socket.io Encoder instance\n */\nexport class Encoder {\n    /**\n     * Encoder constructor\n     *\n     * @param {function} replacer - custom replacer to pass down to JSON.parse\n     */\n    constructor(replacer) {\n        this.replacer = replacer;\n    }\n    /**\n     * Encode a packet as a single string if non-binary, or as a\n     * buffer sequence, depending on packet type.\n     *\n     * @param {Object} obj - packet object\n     */\n    encode(obj) {\n        if (obj.type === PacketType.EVENT || obj.type === PacketType.ACK) {\n            if (hasBinary(obj)) {\n                obj.type =\n                    obj.type === PacketType.EVENT\n                        ? PacketType.BINARY_EVENT\n                        : PacketType.BINARY_ACK;\n                return this.encodeAsBinary(obj);\n            }\n        }\n        return [this.encodeAsString(obj)];\n    }\n    /**\n     * Encode packet as string.\n     */\n    encodeAsString(obj) {\n        // first is type\n        let str = \"\" + obj.type;\n        // attachments if we have them\n        if (obj.type === PacketType.BINARY_EVENT ||\n            obj.type === PacketType.BINARY_ACK) {\n            str += obj.attachments + \"-\";\n        }\n        // if we have a namespace other than `/`\n        // we append it followed by a comma `,`\n        if (obj.nsp && \"/\" !== obj.nsp) {\n            str += obj.nsp + \",\";\n        }\n        // immediately followed by the id\n        if (null != obj.id) {\n            str += obj.id;\n        }\n        // json data\n        if (null != obj.data) {\n            str += JSON.stringify(obj.data, this.replacer);\n        }\n        return str;\n    }\n    /**\n     * Encode packet as 'buffer sequence' by removing blobs, and\n     * deconstructing packet into object with placeholders and\n     * a list of buffers.\n     */\n    encodeAsBinary(obj) {\n        const deconstruction = deconstructPacket(obj);\n        const pack = this.encodeAsString(deconstruction.packet);\n        const buffers = deconstruction.buffers;\n        buffers.unshift(pack); // add packet info to beginning of data list\n        return buffers; // write all the buffers\n    }\n}\n/**\n * A socket.io Decoder instance\n *\n * @return {Object} decoder\n */\nexport class Decoder extends Emitter {\n    /**\n     * Decoder constructor\n     *\n     * @param {function} reviver - custom reviver to pass down to JSON.stringify\n     */\n    constructor(reviver) {\n        super();\n        this.reviver = reviver;\n    }\n    /**\n     * Decodes an encoded packet string into packet JSON.\n     *\n     * @param {String} obj - encoded packet\n     */\n    add(obj) {\n        let packet;\n        if (typeof obj === \"string\") {\n            packet = this.decodeString(obj);\n            if (packet.type === PacketType.BINARY_EVENT ||\n                packet.type === PacketType.BINARY_ACK) {\n                // binary packet's json\n                this.reconstructor = new BinaryReconstructor(packet);\n                // no attachments, labeled binary but no binary data to follow\n                if (packet.attachments === 0) {\n                    super.emitReserved(\"decoded\", packet);\n                }\n            }\n            else {\n                // non-binary full packet\n                super.emitReserved(\"decoded\", packet);\n            }\n        }\n        else if (isBinary(obj) || obj.base64) {\n            // raw binary data\n            if (!this.reconstructor) {\n                throw new Error(\"got binary data when not reconstructing a packet\");\n            }\n            else {\n                packet = this.reconstructor.takeBinaryData(obj);\n                if (packet) {\n                    // received final buffer\n                    this.reconstructor = null;\n                    super.emitReserved(\"decoded\", packet);\n                }\n            }\n        }\n        else {\n            throw new Error(\"Unknown type: \" + obj);\n        }\n    }\n    /**\n     * Decode a packet String (JSON data)\n     *\n     * @param {String} str\n     * @return {Object} packet\n     */\n    decodeString(str) {\n        let i = 0;\n        // look up type\n        const p = {\n            type: Number(str.charAt(0)),\n        };\n        if (PacketType[p.type] === undefined) {\n            throw new Error(\"unknown packet type \" + p.type);\n        }\n        // look up attachments if type binary\n        if (p.type === PacketType.BINARY_EVENT ||\n            p.type === PacketType.BINARY_ACK) {\n            const start = i + 1;\n            while (str.charAt(++i) !== \"-\" && i != str.length) { }\n            const buf = str.substring(start, i);\n            if (buf != Number(buf) || str.charAt(i) !== \"-\") {\n                throw new Error(\"Illegal attachments\");\n            }\n            p.attachments = Number(buf);\n        }\n        // look up namespace (if any)\n        if (\"/\" === str.charAt(i + 1)) {\n            const start = i + 1;\n            while (++i) {\n                const c = str.charAt(i);\n                if (\",\" === c)\n                    break;\n                if (i === str.length)\n                    break;\n            }\n            p.nsp = str.substring(start, i);\n        }\n        else {\n            p.nsp = \"/\";\n        }\n        // look up id\n        const next = str.charAt(i + 1);\n        if (\"\" !== next && Number(next) == next) {\n            const start = i + 1;\n            while (++i) {\n                const c = str.charAt(i);\n                if (null == c || Number(c) != c) {\n                    --i;\n                    break;\n                }\n                if (i === str.length)\n                    break;\n            }\n            p.id = Number(str.substring(start, i + 1));\n        }\n        // look up json data\n        if (str.charAt(++i)) {\n            const payload = this.tryParse(str.substr(i));\n            if (Decoder.isPayloadValid(p.type, payload)) {\n                p.data = payload;\n            }\n            else {\n                throw new Error(\"invalid payload\");\n            }\n        }\n        return p;\n    }\n    tryParse(str) {\n        try {\n            return JSON.parse(str, this.reviver);\n        }\n        catch (e) {\n            return false;\n        }\n    }\n    static isPayloadValid(type, payload) {\n        switch (type) {\n            case PacketType.CONNECT:\n                return typeof payload === \"object\";\n            case PacketType.DISCONNECT:\n                return payload === undefined;\n            case PacketType.CONNECT_ERROR:\n                return typeof payload === \"string\" || typeof payload === \"object\";\n            case PacketType.EVENT:\n            case PacketType.BINARY_EVENT:\n                return Array.isArray(payload) && payload.length > 0;\n            case PacketType.ACK:\n            case PacketType.BINARY_ACK:\n                return Array.isArray(payload);\n        }\n    }\n    /**\n     * Deallocates a parser's resources\n     */\n    destroy() {\n        if (this.reconstructor) {\n            this.reconstructor.finishedReconstruction();\n        }\n    }\n}\n/**\n * A manager of a binary event's 'buffer sequence'. Should\n * be constructed whenever a packet of type BINARY_EVENT is\n * decoded.\n *\n * @param {Object} packet\n * @return {BinaryReconstructor} initialized reconstructor\n */\nclass BinaryReconstructor {\n    constructor(packet) {\n        this.packet = packet;\n        this.buffers = [];\n        this.reconPack = packet;\n    }\n    /**\n     * Method to be called when binary data received from connection\n     * after a BINARY_EVENT packet.\n     *\n     * @param {Buffer | ArrayBuffer} binData - the raw binary data received\n     * @return {null | Object} returns null if more binary data is expected or\n     *   a reconstructed packet object if all buffers have been received.\n     */\n    takeBinaryData(binData) {\n        this.buffers.push(binData);\n        if (this.buffers.length === this.reconPack.attachments) {\n            // done with buffer list\n            const packet = reconstructPacket(this.reconPack, this.buffers);\n            this.finishedReconstruction();\n            return packet;\n        }\n        return null;\n    }\n    /**\n     * Cleans up binary packet reconstruction variables.\n     */\n    finishedReconstruction() {\n        this.reconPack = null;\n        this.buffers = [];\n    }\n}\n","export function on(obj, ev, fn) {\n    obj.on(ev, fn);\n    return function subDestroy() {\n        obj.off(ev, fn);\n    };\n}\n","import { PacketType } from \"socket.io-parser\";\nimport { on } from \"./on.js\";\nimport { Emitter, } from \"@socket.io/component-emitter\";\n/**\n * Internal events.\n * These events can't be emitted by the user.\n */\nconst RESERVED_EVENTS = Object.freeze({\n    connect: 1,\n    connect_error: 1,\n    disconnect: 1,\n    disconnecting: 1,\n    // EventEmitter reserved events: https://nodejs.org/api/events.html#events_event_newlistener\n    newListener: 1,\n    removeListener: 1,\n});\nexport class Socket extends Emitter {\n    /**\n     * `Socket` constructor.\n     *\n     * @public\n     */\n    constructor(io, nsp, opts) {\n        super();\n        this.connected = false;\n        this.receiveBuffer = [];\n        this.sendBuffer = [];\n        this.ids = 0;\n        this.acks = {};\n        this.flags = {};\n        this.io = io;\n        this.nsp = nsp;\n        if (opts && opts.auth) {\n            this.auth = opts.auth;\n        }\n        if (this.io._autoConnect)\n            this.open();\n    }\n    /**\n     * Whether the socket is currently disconnected\n     */\n    get disconnected() {\n        return !this.connected;\n    }\n    /**\n     * Subscribe to open, close and packet events\n     *\n     * @private\n     */\n    subEvents() {\n        if (this.subs)\n            return;\n        const io = this.io;\n        this.subs = [\n            on(io, \"open\", this.onopen.bind(this)),\n            on(io, \"packet\", this.onpacket.bind(this)),\n            on(io, \"error\", this.onerror.bind(this)),\n            on(io, \"close\", this.onclose.bind(this)),\n        ];\n    }\n    /**\n     * Whether the Socket will try to reconnect when its Manager connects or reconnects\n     */\n    get active() {\n        return !!this.subs;\n    }\n    /**\n     * \"Opens\" the socket.\n     *\n     * @public\n     */\n    connect() {\n        if (this.connected)\n            return this;\n        this.subEvents();\n        if (!this.io[\"_reconnecting\"])\n            this.io.open(); // ensure open\n        if (\"open\" === this.io._readyState)\n            this.onopen();\n        return this;\n    }\n    /**\n     * Alias for connect()\n     */\n    open() {\n        return this.connect();\n    }\n    /**\n     * Sends a `message` event.\n     *\n     * @return self\n     * @public\n     */\n    send(...args) {\n        args.unshift(\"message\");\n        this.emit.apply(this, args);\n        return this;\n    }\n    /**\n     * Override `emit`.\n     * If the event is in `events`, it's emitted normally.\n     *\n     * @return self\n     * @public\n     */\n    emit(ev, ...args) {\n        if (RESERVED_EVENTS.hasOwnProperty(ev)) {\n            throw new Error('\"' + ev + '\" is a reserved event name');\n        }\n        args.unshift(ev);\n        const packet = {\n            type: PacketType.EVENT,\n            data: args,\n        };\n        packet.options = {};\n        packet.options.compress = this.flags.compress !== false;\n        // event ack callback\n        if (\"function\" === typeof args[args.length - 1]) {\n            const id = this.ids++;\n            const ack = args.pop();\n            this._registerAckCallback(id, ack);\n            packet.id = id;\n        }\n        const isTransportWritable = this.io.engine &&\n            this.io.engine.transport &&\n            this.io.engine.transport.writable;\n        const discardPacket = this.flags.volatile && (!isTransportWritable || !this.connected);\n        if (discardPacket) {\n        }\n        else if (this.connected) {\n            this.notifyOutgoingListeners(packet);\n            this.packet(packet);\n        }\n        else {\n            this.sendBuffer.push(packet);\n        }\n        this.flags = {};\n        return this;\n    }\n    /**\n     * @private\n     */\n    _registerAckCallback(id, ack) {\n        const timeout = this.flags.timeout;\n        if (timeout === undefined) {\n            this.acks[id] = ack;\n            return;\n        }\n        // @ts-ignore\n        const timer = this.io.setTimeoutFn(() => {\n            delete this.acks[id];\n            for (let i = 0; i < this.sendBuffer.length; i++) {\n                if (this.sendBuffer[i].id === id) {\n                    this.sendBuffer.splice(i, 1);\n                }\n            }\n            ack.call(this, new Error(\"operation has timed out\"));\n        }, timeout);\n        this.acks[id] = (...args) => {\n            // @ts-ignore\n            this.io.clearTimeoutFn(timer);\n            ack.apply(this, [null, ...args]);\n        };\n    }\n    /**\n     * Sends a packet.\n     *\n     * @param packet\n     * @private\n     */\n    packet(packet) {\n        packet.nsp = this.nsp;\n        this.io._packet(packet);\n    }\n    /**\n     * Called upon engine `open`.\n     *\n     * @private\n     */\n    onopen() {\n        if (typeof this.auth == \"function\") {\n            this.auth((data) => {\n                this.packet({ type: PacketType.CONNECT, data });\n            });\n        }\n        else {\n            this.packet({ type: PacketType.CONNECT, data: this.auth });\n        }\n    }\n    /**\n     * Called upon engine or manager `error`.\n     *\n     * @param err\n     * @private\n     */\n    onerror(err) {\n        if (!this.connected) {\n            this.emitReserved(\"connect_error\", err);\n        }\n    }\n    /**\n     * Called upon engine `close`.\n     *\n     * @param reason\n     * @param description\n     * @private\n     */\n    onclose(reason, description) {\n        this.connected = false;\n        delete this.id;\n        this.emitReserved(\"disconnect\", reason, description);\n    }\n    /**\n     * Called with socket packet.\n     *\n     * @param packet\n     * @private\n     */\n    onpacket(packet) {\n        const sameNamespace = packet.nsp === this.nsp;\n        if (!sameNamespace)\n            return;\n        switch (packet.type) {\n            case PacketType.CONNECT:\n                if (packet.data && packet.data.sid) {\n                    const id = packet.data.sid;\n                    this.onconnect(id);\n                }\n                else {\n                    this.emitReserved(\"connect_error\", new Error(\"It seems you are trying to reach a Socket.IO server in v2.x with a v3.x client, but they are not compatible (more information here: https://socket.io/docs/v3/migrating-from-2-x-to-3-0/)\"));\n                }\n                break;\n            case PacketType.EVENT:\n            case PacketType.BINARY_EVENT:\n                this.onevent(packet);\n                break;\n            case PacketType.ACK:\n            case PacketType.BINARY_ACK:\n                this.onack(packet);\n                break;\n            case PacketType.DISCONNECT:\n                this.ondisconnect();\n                break;\n            case PacketType.CONNECT_ERROR:\n                this.destroy();\n                const err = new Error(packet.data.message);\n                // @ts-ignore\n                err.data = packet.data.data;\n                this.emitReserved(\"connect_error\", err);\n                break;\n        }\n    }\n    /**\n     * Called upon a server event.\n     *\n     * @param packet\n     * @private\n     */\n    onevent(packet) {\n        const args = packet.data || [];\n        if (null != packet.id) {\n            args.push(this.ack(packet.id));\n        }\n        if (this.connected) {\n            this.emitEvent(args);\n        }\n        else {\n            this.receiveBuffer.push(Object.freeze(args));\n        }\n    }\n    emitEvent(args) {\n        if (this._anyListeners && this._anyListeners.length) {\n            const listeners = this._anyListeners.slice();\n            for (const listener of listeners) {\n                listener.apply(this, args);\n            }\n        }\n        super.emit.apply(this, args);\n    }\n    /**\n     * Produces an ack callback to emit with an event.\n     *\n     * @private\n     */\n    ack(id) {\n        const self = this;\n        let sent = false;\n        return function (...args) {\n            // prevent double callbacks\n            if (sent)\n                return;\n            sent = true;\n            self.packet({\n                type: PacketType.ACK,\n                id: id,\n                data: args,\n            });\n        };\n    }\n    /**\n     * Called upon a server acknowlegement.\n     *\n     * @param packet\n     * @private\n     */\n    onack(packet) {\n        const ack = this.acks[packet.id];\n        if (\"function\" === typeof ack) {\n            ack.apply(this, packet.data);\n            delete this.acks[packet.id];\n        }\n        else {\n        }\n    }\n    /**\n     * Called upon server connect.\n     *\n     * @private\n     */\n    onconnect(id) {\n        this.id = id;\n        this.connected = true;\n        this.emitBuffered();\n        this.emitReserved(\"connect\");\n    }\n    /**\n     * Emit buffered events (received and emitted).\n     *\n     * @private\n     */\n    emitBuffered() {\n        this.receiveBuffer.forEach((args) => this.emitEvent(args));\n        this.receiveBuffer = [];\n        this.sendBuffer.forEach((packet) => {\n            this.notifyOutgoingListeners(packet);\n            this.packet(packet);\n        });\n        this.sendBuffer = [];\n    }\n    /**\n     * Called upon server disconnect.\n     *\n     * @private\n     */\n    ondisconnect() {\n        this.destroy();\n        this.onclose(\"io server disconnect\");\n    }\n    /**\n     * Called upon forced client/server side disconnections,\n     * this method ensures the manager stops tracking us and\n     * that reconnections don't get triggered for this.\n     *\n     * @private\n     */\n    destroy() {\n        if (this.subs) {\n            // clean subscriptions to avoid reconnections\n            this.subs.forEach((subDestroy) => subDestroy());\n            this.subs = undefined;\n        }\n        this.io[\"_destroy\"](this);\n    }\n    /**\n     * Disconnects the socket manually.\n     *\n     * @return self\n     * @public\n     */\n    disconnect() {\n        if (this.connected) {\n            this.packet({ type: PacketType.DISCONNECT });\n        }\n        // remove socket from pool\n        this.destroy();\n        if (this.connected) {\n            // fire events\n            this.onclose(\"io client disconnect\");\n        }\n        return this;\n    }\n    /**\n     * Alias for disconnect()\n     *\n     * @return self\n     * @public\n     */\n    close() {\n        return this.disconnect();\n    }\n    /**\n     * Sets the compress flag.\n     *\n     * @param compress - if `true`, compresses the sending data\n     * @return self\n     * @public\n     */\n    compress(compress) {\n        this.flags.compress = compress;\n        return this;\n    }\n    /**\n     * Sets a modifier for a subsequent event emission that the event message will be dropped when this socket is not\n     * ready to send messages.\n     *\n     * @returns self\n     * @public\n     */\n    get volatile() {\n        this.flags.volatile = true;\n        return this;\n    }\n    /**\n     * Sets a modifier for a subsequent event emission that the callback will be called with an error when the\n     * given number of milliseconds have elapsed without an acknowledgement from the server:\n     *\n     * ```\n     * socket.timeout(5000).emit(\"my-event\", (err) => {\n     *   if (err) {\n     *     // the server did not acknowledge the event in the given delay\n     *   }\n     * });\n     * ```\n     *\n     * @returns self\n     * @public\n     */\n    timeout(timeout) {\n        this.flags.timeout = timeout;\n        return this;\n    }\n    /**\n     * Adds a listener that will be fired when any event is emitted. The event name is passed as the first argument to the\n     * callback.\n     *\n     * @param listener\n     * @public\n     */\n    onAny(listener) {\n        this._anyListeners = this._anyListeners || [];\n        this._anyListeners.push(listener);\n        return this;\n    }\n    /**\n     * Adds a listener that will be fired when any event is emitted. The event name is passed as the first argument to the\n     * callback. The listener is added to the beginning of the listeners array.\n     *\n     * @param listener\n     * @public\n     */\n    prependAny(listener) {\n        this._anyListeners = this._anyListeners || [];\n        this._anyListeners.unshift(listener);\n        return this;\n    }\n    /**\n     * Removes the listener that will be fired when any event is emitted.\n     *\n     * @param listener\n     * @public\n     */\n    offAny(listener) {\n        if (!this._anyListeners) {\n            return this;\n        }\n        if (listener) {\n            const listeners = this._anyListeners;\n            for (let i = 0; i < listeners.length; i++) {\n                if (listener === listeners[i]) {\n                    listeners.splice(i, 1);\n                    return this;\n                }\n            }\n        }\n        else {\n            this._anyListeners = [];\n        }\n        return this;\n    }\n    /**\n     * Returns an array of listeners that are listening for any event that is specified. This array can be manipulated,\n     * e.g. to remove listeners.\n     *\n     * @public\n     */\n    listenersAny() {\n        return this._anyListeners || [];\n    }\n    /**\n     * Adds a listener that will be fired when any event is emitted. The event name is passed as the first argument to the\n     * callback.\n     *\n     * @param listener\n     *\n     * <pre><code>\n     *\n     * socket.onAnyOutgoing((event, ...args) => {\n     *   console.log(event);\n     * });\n     *\n     * </pre></code>\n     *\n     * @public\n     */\n    onAnyOutgoing(listener) {\n        this._anyOutgoingListeners = this._anyOutgoingListeners || [];\n        this._anyOutgoingListeners.push(listener);\n        return this;\n    }\n    /**\n     * Adds a listener that will be fired when any event is emitted. The event name is passed as the first argument to the\n     * callback. The listener is added to the beginning of the listeners array.\n     *\n     * @param listener\n     *\n     * <pre><code>\n     *\n     * socket.prependAnyOutgoing((event, ...args) => {\n     *   console.log(event);\n     * });\n     *\n     * </pre></code>\n     *\n     * @public\n     */\n    prependAnyOutgoing(listener) {\n        this._anyOutgoingListeners = this._anyOutgoingListeners || [];\n        this._anyOutgoingListeners.unshift(listener);\n        return this;\n    }\n    /**\n     * Removes the listener that will be fired when any event is emitted.\n     *\n     * @param listener\n     *\n     * <pre><code>\n     *\n     * const handler = (event, ...args) => {\n     *   console.log(event);\n     * }\n     *\n     * socket.onAnyOutgoing(handler);\n     *\n     * // then later\n     * socket.offAnyOutgoing(handler);\n     *\n     * </pre></code>\n     *\n     * @public\n     */\n    offAnyOutgoing(listener) {\n        if (!this._anyOutgoingListeners) {\n            return this;\n        }\n        if (listener) {\n            const listeners = this._anyOutgoingListeners;\n            for (let i = 0; i < listeners.length; i++) {\n                if (listener === listeners[i]) {\n                    listeners.splice(i, 1);\n                    return this;\n                }\n            }\n        }\n        else {\n            this._anyOutgoingListeners = [];\n        }\n        return this;\n    }\n    /**\n     * Returns an array of listeners that are listening for any event that is specified. This array can be manipulated,\n     * e.g. to remove listeners.\n     *\n     * @public\n     */\n    listenersAnyOutgoing() {\n        return this._anyOutgoingListeners || [];\n    }\n    /**\n     * Notify the listeners for each packet sent\n     *\n     * @param packet\n     *\n     * @private\n     */\n    notifyOutgoingListeners(packet) {\n        if (this._anyOutgoingListeners && this._anyOutgoingListeners.length) {\n            const listeners = this._anyOutgoingListeners.slice();\n            for (const listener of listeners) {\n                listener.apply(this, packet.data);\n            }\n        }\n    }\n}\n","/**\n * Initialize backoff timer with `opts`.\n *\n * - `min` initial timeout in milliseconds [100]\n * - `max` max timeout [10000]\n * - `jitter` [0]\n * - `factor` [2]\n *\n * @param {Object} opts\n * @api public\n */\nexport function Backoff(opts) {\n    opts = opts || {};\n    this.ms = opts.min || 100;\n    this.max = opts.max || 10000;\n    this.factor = opts.factor || 2;\n    this.jitter = opts.jitter > 0 && opts.jitter <= 1 ? opts.jitter : 0;\n    this.attempts = 0;\n}\n/**\n * Return the backoff duration.\n *\n * @return {Number}\n * @api public\n */\nBackoff.prototype.duration = function () {\n    var ms = this.ms * Math.pow(this.factor, this.attempts++);\n    if (this.jitter) {\n        var rand = Math.random();\n        var deviation = Math.floor(rand * this.jitter * ms);\n        ms = (Math.floor(rand * 10) & 1) == 0 ? ms - deviation : ms + deviation;\n    }\n    return Math.min(ms, this.max) | 0;\n};\n/**\n * Reset the number of attempts.\n *\n * @api public\n */\nBackoff.prototype.reset = function () {\n    this.attempts = 0;\n};\n/**\n * Set the minimum duration\n *\n * @api public\n */\nBackoff.prototype.setMin = function (min) {\n    this.ms = min;\n};\n/**\n * Set the maximum duration\n *\n * @api public\n */\nBackoff.prototype.setMax = function (max) {\n    this.max = max;\n};\n/**\n * Set the jitter\n *\n * @api public\n */\nBackoff.prototype.setJitter = function (jitter) {\n    this.jitter = jitter;\n};\n","import { Socket as Engine, installTimerFunctions, } from \"engine.io-client\";\nimport { Socket } from \"./socket.js\";\nimport * as parser from \"socket.io-parser\";\nimport { on } from \"./on.js\";\nimport { Backoff } from \"./contrib/backo2.js\";\nimport { Emitter, } from \"@socket.io/component-emitter\";\nexport class Manager extends Emitter {\n    constructor(uri, opts) {\n        var _a;\n        super();\n        this.nsps = {};\n        this.subs = [];\n        if (uri && \"object\" === typeof uri) {\n            opts = uri;\n            uri = undefined;\n        }\n        opts = opts || {};\n        opts.path = opts.path || \"/socket.io\";\n        this.opts = opts;\n        installTimerFunctions(this, opts);\n        this.reconnection(opts.reconnection !== false);\n        this.reconnectionAttempts(opts.reconnectionAttempts || Infinity);\n        this.reconnectionDelay(opts.reconnectionDelay || 1000);\n        this.reconnectionDelayMax(opts.reconnectionDelayMax || 5000);\n        this.randomizationFactor((_a = opts.randomizationFactor) !== null && _a !== void 0 ? _a : 0.5);\n        this.backoff = new Backoff({\n            min: this.reconnectionDelay(),\n            max: this.reconnectionDelayMax(),\n            jitter: this.randomizationFactor(),\n        });\n        this.timeout(null == opts.timeout ? 20000 : opts.timeout);\n        this._readyState = \"closed\";\n        this.uri = uri;\n        const _parser = opts.parser || parser;\n        this.encoder = new _parser.Encoder();\n        this.decoder = new _parser.Decoder();\n        this._autoConnect = opts.autoConnect !== false;\n        if (this._autoConnect)\n            this.open();\n    }\n    reconnection(v) {\n        if (!arguments.length)\n            return this._reconnection;\n        this._reconnection = !!v;\n        return this;\n    }\n    reconnectionAttempts(v) {\n        if (v === undefined)\n            return this._reconnectionAttempts;\n        this._reconnectionAttempts = v;\n        return this;\n    }\n    reconnectionDelay(v) {\n        var _a;\n        if (v === undefined)\n            return this._reconnectionDelay;\n        this._reconnectionDelay = v;\n        (_a = this.backoff) === null || _a === void 0 ? void 0 : _a.setMin(v);\n        return this;\n    }\n    randomizationFactor(v) {\n        var _a;\n        if (v === undefined)\n            return this._randomizationFactor;\n        this._randomizationFactor = v;\n        (_a = this.backoff) === null || _a === void 0 ? void 0 : _a.setJitter(v);\n        return this;\n    }\n    reconnectionDelayMax(v) {\n        var _a;\n        if (v === undefined)\n            return this._reconnectionDelayMax;\n        this._reconnectionDelayMax = v;\n        (_a = this.backoff) === null || _a === void 0 ? void 0 : _a.setMax(v);\n        return this;\n    }\n    timeout(v) {\n        if (!arguments.length)\n            return this._timeout;\n        this._timeout = v;\n        return this;\n    }\n    /**\n     * Starts trying to reconnect if reconnection is enabled and we have not\n     * started reconnecting yet\n     *\n     * @private\n     */\n    maybeReconnectOnOpen() {\n        // Only try to reconnect if it's the first time we're connecting\n        if (!this._reconnecting &&\n            this._reconnection &&\n            this.backoff.attempts === 0) {\n            // keeps reconnection from firing twice for the same reconnection loop\n            this.reconnect();\n        }\n    }\n    /**\n     * Sets the current transport `socket`.\n     *\n     * @param {Function} fn - optional, callback\n     * @return self\n     * @public\n     */\n    open(fn) {\n        if (~this._readyState.indexOf(\"open\"))\n            return this;\n        this.engine = new Engine(this.uri, this.opts);\n        const socket = this.engine;\n        const self = this;\n        this._readyState = \"opening\";\n        this.skipReconnect = false;\n        // emit `open`\n        const openSubDestroy = on(socket, \"open\", function () {\n            self.onopen();\n            fn && fn();\n        });\n        // emit `error`\n        const errorSub = on(socket, \"error\", (err) => {\n            self.cleanup();\n            self._readyState = \"closed\";\n            this.emitReserved(\"error\", err);\n            if (fn) {\n                fn(err);\n            }\n            else {\n                // Only do this if there is no fn to handle the error\n                self.maybeReconnectOnOpen();\n            }\n        });\n        if (false !== this._timeout) {\n            const timeout = this._timeout;\n            if (timeout === 0) {\n                openSubDestroy(); // prevents a race condition with the 'open' event\n            }\n            // set timer\n            const timer = this.setTimeoutFn(() => {\n                openSubDestroy();\n                socket.close();\n                // @ts-ignore\n                socket.emit(\"error\", new Error(\"timeout\"));\n            }, timeout);\n            if (this.opts.autoUnref) {\n                timer.unref();\n            }\n            this.subs.push(function subDestroy() {\n                clearTimeout(timer);\n            });\n        }\n        this.subs.push(openSubDestroy);\n        this.subs.push(errorSub);\n        return this;\n    }\n    /**\n     * Alias for open()\n     *\n     * @return self\n     * @public\n     */\n    connect(fn) {\n        return this.open(fn);\n    }\n    /**\n     * Called upon transport open.\n     *\n     * @private\n     */\n    onopen() {\n        // clear old subs\n        this.cleanup();\n        // mark as open\n        this._readyState = \"open\";\n        this.emitReserved(\"open\");\n        // add new subs\n        const socket = this.engine;\n        this.subs.push(on(socket, \"ping\", this.onping.bind(this)), on(socket, \"data\", this.ondata.bind(this)), on(socket, \"error\", this.onerror.bind(this)), on(socket, \"close\", this.onclose.bind(this)), on(this.decoder, \"decoded\", this.ondecoded.bind(this)));\n    }\n    /**\n     * Called upon a ping.\n     *\n     * @private\n     */\n    onping() {\n        this.emitReserved(\"ping\");\n    }\n    /**\n     * Called with data.\n     *\n     * @private\n     */\n    ondata(data) {\n        this.decoder.add(data);\n    }\n    /**\n     * Called when parser fully decodes a packet.\n     *\n     * @private\n     */\n    ondecoded(packet) {\n        this.emitReserved(\"packet\", packet);\n    }\n    /**\n     * Called upon socket error.\n     *\n     * @private\n     */\n    onerror(err) {\n        this.emitReserved(\"error\", err);\n    }\n    /**\n     * Creates a new socket for the given `nsp`.\n     *\n     * @return {Socket}\n     * @public\n     */\n    socket(nsp, opts) {\n        let socket = this.nsps[nsp];\n        if (!socket) {\n            socket = new Socket(this, nsp, opts);\n            this.nsps[nsp] = socket;\n        }\n        return socket;\n    }\n    /**\n     * Called upon a socket close.\n     *\n     * @param socket\n     * @private\n     */\n    _destroy(socket) {\n        const nsps = Object.keys(this.nsps);\n        for (const nsp of nsps) {\n            const socket = this.nsps[nsp];\n            if (socket.active) {\n                return;\n            }\n        }\n        this._close();\n    }\n    /**\n     * Writes a packet.\n     *\n     * @param packet\n     * @private\n     */\n    _packet(packet) {\n        const encodedPackets = this.encoder.encode(packet);\n        for (let i = 0; i < encodedPackets.length; i++) {\n            this.engine.write(encodedPackets[i], packet.options);\n        }\n    }\n    /**\n     * Clean up transport subscriptions and packet buffer.\n     *\n     * @private\n     */\n    cleanup() {\n        this.subs.forEach((subDestroy) => subDestroy());\n        this.subs.length = 0;\n        this.decoder.destroy();\n    }\n    /**\n     * Close the current socket.\n     *\n     * @private\n     */\n    _close() {\n        this.skipReconnect = true;\n        this._reconnecting = false;\n        this.onclose(\"forced close\");\n        if (this.engine)\n            this.engine.close();\n    }\n    /**\n     * Alias for close()\n     *\n     * @private\n     */\n    disconnect() {\n        return this._close();\n    }\n    /**\n     * Called upon engine close.\n     *\n     * @private\n     */\n    onclose(reason, description) {\n        this.cleanup();\n        this.backoff.reset();\n        this._readyState = \"closed\";\n        this.emitReserved(\"close\", reason, description);\n        if (this._reconnection && !this.skipReconnect) {\n            this.reconnect();\n        }\n    }\n    /**\n     * Attempt a reconnection.\n     *\n     * @private\n     */\n    reconnect() {\n        if (this._reconnecting || this.skipReconnect)\n            return this;\n        const self = this;\n        if (this.backoff.attempts >= this._reconnectionAttempts) {\n            this.backoff.reset();\n            this.emitReserved(\"reconnect_failed\");\n            this._reconnecting = false;\n        }\n        else {\n            const delay = this.backoff.duration();\n            this._reconnecting = true;\n            const timer = this.setTimeoutFn(() => {\n                if (self.skipReconnect)\n                    return;\n                this.emitReserved(\"reconnect_attempt\", self.backoff.attempts);\n                // check again for the case socket closed in above events\n                if (self.skipReconnect)\n                    return;\n                self.open((err) => {\n                    if (err) {\n                        self._reconnecting = false;\n                        self.reconnect();\n                        this.emitReserved(\"reconnect_error\", err);\n                    }\n                    else {\n                        self.onreconnect();\n                    }\n                });\n            }, delay);\n            if (this.opts.autoUnref) {\n                timer.unref();\n            }\n            this.subs.push(function subDestroy() {\n                clearTimeout(timer);\n            });\n        }\n    }\n    /**\n     * Called upon successful reconnect.\n     *\n     * @private\n     */\n    onreconnect() {\n        const attempt = this.backoff.attempts;\n        this._reconnecting = false;\n        this.backoff.reset();\n        this.emitReserved(\"reconnect\", attempt);\n    }\n}\n","import { url } from \"./url.js\";\nimport { Manager } from \"./manager.js\";\nimport { Socket } from \"./socket.js\";\n/**\n * Managers cache.\n */\nconst cache = {};\nfunction lookup(uri, opts) {\n    if (typeof uri === \"object\") {\n        opts = uri;\n        uri = undefined;\n    }\n    opts = opts || {};\n    const parsed = url(uri, opts.path || \"/socket.io\");\n    const source = parsed.source;\n    const id = parsed.id;\n    const path = parsed.path;\n    const sameNamespace = cache[id] && path in cache[id][\"nsps\"];\n    const newConnection = opts.forceNew ||\n        opts[\"force new connection\"] ||\n        false === opts.multiplex ||\n        sameNamespace;\n    let io;\n    if (newConnection) {\n        io = new Manager(source, opts);\n    }\n    else {\n        if (!cache[id]) {\n            cache[id] = new Manager(source, opts);\n        }\n        io = cache[id];\n    }\n    if (parsed.query && !opts.query) {\n        opts.query = parsed.queryKey;\n    }\n    return io.socket(parsed.path, opts);\n}\n// so that \"lookup\" can be used both as a function (e.g. `io(...)`) and as a\n// namespace (e.g. `io.connect(...)`), for backward compatibility\nObject.assign(lookup, {\n    Manager,\n    Socket,\n    io: lookup,\n    connect: lookup,\n});\n/**\n * Protocol version.\n *\n * @public\n */\nexport { protocol } from \"socket.io-parser\";\n/**\n * Expose constructors for standalone build.\n *\n * @public\n */\nexport { Manager, Socket, lookup as io, lookup as connect, lookup as default, 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