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Object.setPrototypeOf.bind() : function _setPrototypeOf(o, p) {\n      o.__proto__ = p;\n      return o;\n    };\n    return _setPrototypeOf(o, p);\n  }\n\n  function _isNativeReflectConstruct() {\n    if (typeof Reflect === \"undefined\" || !Reflect.construct) return false;\n    if (Reflect.construct.sham) return false;\n    if (typeof Proxy === \"function\") return true;\n\n    try {\n      Boolean.prototype.valueOf.call(Reflect.construct(Boolean, [], function () {}));\n      return true;\n    } catch (e) {\n      return false;\n    }\n  }\n\n  function _assertThisInitialized(self) {\n    if (self === void 0) {\n      throw new ReferenceError(\"this hasn't been initialised - super() hasn't been called\");\n    }\n\n    return self;\n  }\n\n  function _possibleConstructorReturn(self, call) {\n    if (call && (typeof call === \"object\" || typeof call === \"function\")) {\n      return call;\n    } else if (call !== void 0) {\n      throw new TypeError(\"Derived constructors may only return object or undefined\");\n    }\n\n    return _assertThisInitialized(self);\n  }\n\n  function _createSuper(Derived) {\n    var hasNativeReflectConstruct = _isNativeReflectConstruct();\n\n    return function _createSuperInternal() {\n      var Super = _getPrototypeOf(Derived),\n          result;\n\n      if (hasNativeReflectConstruct) {\n        var NewTarget = _getPrototypeOf(this).constructor;\n\n        result = Reflect.construct(Super, arguments, NewTarget);\n      } else {\n        result = Super.apply(this, arguments);\n      }\n\n      return _possibleConstructorReturn(this, result);\n    };\n  }\n\n  function _superPropBase(object, property) {\n    while (!Object.prototype.hasOwnProperty.call(object, property)) {\n      object = _getPrototypeOf(object);\n      if (object === null) break;\n    }\n\n    return object;\n  }\n\n  function _get() {\n    if (typeof Reflect !== \"undefined\" && Reflect.get) {\n      _get = Reflect.get.bind();\n    } else {\n      _get = function _get(target, property, receiver) {\n        var base = _superPropBase(target, property);\n\n        if (!base) return;\n        var desc = Object.getOwnPropertyDescriptor(base, property);\n\n        if (desc.get) {\n          return desc.get.call(arguments.length < 3 ? target : receiver);\n        }\n\n        return desc.value;\n      };\n    }\n\n    return _get.apply(this, arguments);\n  }\n\n  var Emitter = /*#__PURE__*/function () {\n    function Emitter() {\n      _classCallCheck(this, Emitter);\n\n      Object.defineProperty(this, 'listeners', {\n        value: {},\n        writable: true,\n        configurable: true\n      });\n    }\n\n    _createClass(Emitter, [{\n      key: \"addEventListener\",\n      value: function addEventListener(type, callback, options) {\n        if (!(type in this.listeners)) {\n          this.listeners[type] = [];\n        }\n\n        this.listeners[type].push({\n          callback: callback,\n          options: options\n        });\n      }\n    }, {\n      key: \"removeEventListener\",\n      value: function removeEventListener(type, callback) {\n        if (!(type in this.listeners)) {\n          return;\n        }\n\n        var stack = this.listeners[type];\n\n        for (var i = 0, l = stack.length; i < l; i++) {\n          if (stack[i].callback === callback) {\n            stack.splice(i, 1);\n            return;\n          }\n        }\n      }\n    }, {\n      key: \"dispatchEvent\",\n      value: function dispatchEvent(event) {\n        if (!(event.type in this.listeners)) {\n          return;\n        }\n\n        var stack = this.listeners[event.type];\n        var stackToCall = stack.slice();\n\n        for (var i = 0, l = stackToCall.length; i < l; i++) {\n          var listener = stackToCall[i];\n\n          try {\n            listener.callback.call(this, event);\n          } catch (e) {\n            Promise.resolve().then(function () {\n              throw e;\n            });\n          }\n\n          if (listener.options && listener.options.once) {\n            this.removeEventListener(event.type, listener.callback);\n          }\n        }\n\n        return !event.defaultPrevented;\n      }\n    }]);\n\n    return Emitter;\n  }();\n\n  var AbortSignal = /*#__PURE__*/function (_Emitter) {\n    _inherits(AbortSignal, _Emitter);\n\n    var _super = _createSuper(AbortSignal);\n\n    function AbortSignal() {\n      var _this;\n\n      _classCallCheck(this, AbortSignal);\n\n      _this = _super.call(this); // Some versions of babel does not transpile super() correctly for IE <= 10, if the parent\n      // constructor has failed to run, then \"this.listeners\" will still be undefined and then we call\n      // the parent constructor directly instead as a workaround. For general details, see babel bug:\n      // https://github.com/babel/babel/issues/3041\n      // This hack was added as a fix for the issue described here:\n      // https://github.com/Financial-Times/polyfill-library/pull/59#issuecomment-477558042\n\n      if (!_this.listeners) {\n        Emitter.call(_assertThisInitialized(_this));\n      } // Compared to assignment, Object.defineProperty makes properties non-enumerable by default and\n      // we want Object.keys(new AbortController().signal) to be [] for compat with the native impl\n\n\n      Object.defineProperty(_assertThisInitialized(_this), 'aborted', {\n        value: false,\n        writable: true,\n        configurable: true\n      });\n      Object.defineProperty(_assertThisInitialized(_this), 'onabort', {\n        value: null,\n        writable: true,\n        configurable: true\n      });\n      Object.defineProperty(_assertThisInitialized(_this), 'reason', {\n        value: undefined,\n        writable: true,\n        configurable: true\n      });\n      return _this;\n    }\n\n    _createClass(AbortSignal, [{\n      key: \"toString\",\n      value: function toString() {\n        return '[object AbortSignal]';\n      }\n    }, {\n      key: \"dispatchEvent\",\n      value: function dispatchEvent(event) {\n        if (event.type === 'abort') {\n          this.aborted = true;\n\n          if (typeof this.onabort === 'function') {\n            this.onabort.call(this, event);\n          }\n        }\n\n        _get(_getPrototypeOf(AbortSignal.prototype), \"dispatchEvent\", this).call(this, event);\n      }\n    }]);\n\n    return AbortSignal;\n  }(Emitter);\n  var AbortController = /*#__PURE__*/function () {\n    function AbortController() {\n      _classCallCheck(this, AbortController);\n\n      // Compared to assignment, Object.defineProperty makes properties non-enumerable by default and\n      // we want Object.keys(new AbortController()) to be [] for compat with the native impl\n      Object.defineProperty(this, 'signal', {\n        value: new AbortSignal(),\n        writable: true,\n        configurable: true\n      });\n    }\n\n    _createClass(AbortController, [{\n      key: \"abort\",\n      value: function abort(reason) {\n        var event;\n\n        try {\n          event = new Event('abort');\n        } catch (e) {\n          if (typeof document !== 'undefined') {\n            if (!document.createEvent) {\n              // For Internet Explorer 8:\n              event = document.createEventObject();\n              event.type = 'abort';\n            } else {\n              // For Internet Explorer 11:\n              event = document.createEvent('Event');\n              event.initEvent('abort', false, false);\n            }\n          } else {\n            // Fallback where document isn't available:\n            event = {\n              type: 'abort',\n              bubbles: false,\n              cancelable: false\n            };\n          }\n        }\n\n        var signalReason = reason;\n\n        if (signalReason === undefined) {\n          if (typeof document === 'undefined') {\n            signalReason = new Error('This operation was aborted');\n            signalReason.name = 'AbortError';\n          } else {\n            try {\n              signalReason = new DOMException('signal is aborted without reason');\n            } catch (err) {\n              // IE 11 does not support calling the DOMException constructor, use a\n              // regular error object on it instead.\n              signalReason = new Error('This operation was aborted');\n              signalReason.name = 'AbortError';\n            }\n          }\n        }\n\n        this.signal.reason = signalReason;\n        this.signal.dispatchEvent(event);\n      }\n    }, {\n      key: \"toString\",\n      value: function toString() {\n        return '[object AbortController]';\n      }\n    }]);\n\n    return AbortController;\n  }();\n\n  if (typeof Symbol !== 'undefined' && Symbol.toStringTag) {\n    // These are necessary to make sure that we get correct output for:\n    // Object.prototype.toString.call(new AbortController())\n    AbortController.prototype[Symbol.toStringTag] = 'AbortController';\n    AbortSignal.prototype[Symbol.toStringTag] = 'AbortSignal';\n  }\n\n  function polyfillNeeded(self) {\n    if (self.__FORCE_INSTALL_ABORTCONTROLLER_POLYFILL) {\n      console.log('__FORCE_INSTALL_ABORTCONTROLLER_POLYFILL=true is set, will force install polyfill');\n      return true;\n    } // Note that the \"unfetch\" minimal fetch polyfill defines fetch() without\n    // defining window.Request, and this polyfill need to work on top of unfetch\n    // so the below feature detection needs the !self.AbortController part.\n    // The Request.prototype check is also needed because Safari versions 11.1.2\n    // up to and including 12.1.x has a window.AbortController present but still\n    // does NOT correctly implement abortable fetch:\n    // https://bugs.webkit.org/show_bug.cgi?id=174980#c2\n\n\n    return typeof self.Request === 'function' && !self.Request.prototype.hasOwnProperty('signal') || !self.AbortController;\n  }\n\n  (function (self) {\n\n    if (!polyfillNeeded(self)) {\n      return;\n    }\n\n    self.AbortController = AbortController;\n    self.AbortSignal = AbortSignal;\n  })(typeof self !== 'undefined' ? self : 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