abortcontroller-polyfill/dist/abortcontroller-polyfill-only.js

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        configurable: true
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    }, {
      key: "removeEventListener",
      value: function removeEventListener(type, callback) {
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  }();

  var AbortSignal = /*#__PURE__*/function (_Emitter) {
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    var _super = _createSuper(AbortSignal);

    function AbortSignal() {
      var _this;

      _classCallCheck(this, AbortSignal);

      _this = _super.call(this); // Some versions of babel does not transpile super() correctly for IE <= 10, if the parent
      // constructor has failed to run, then "this.listeners" will still be undefined and then we call
      // the parent constructor directly instead as a workaround. For general details, see babel bug:
      // https://github.com/babel/babel/issues/3041
      // This hack was added as a fix for the issue described here:
      // https://github.com/Financial-Times/polyfill-library/pull/59#issuecomment-477558042

      if (!_this.listeners) {
        Emitter.call(_assertThisInitialized(_this));
      } // Compared to assignment, Object.defineProperty makes properties non-enumerable by default and
      // we want Object.keys(new AbortController().signal) to be [] for compat with the native impl


      Object.defineProperty(_assertThisInitialized(_this), 'aborted', {
        value: false,
        writable: true,
        configurable: true
      });
      Object.defineProperty(_assertThisInitialized(_this), 'onabort', {
        value: null,
        writable: true,
        configurable: true
      });
      return _this;
    }

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      key: "toString",
      value: function toString() {
        return '[object AbortSignal]';
      }
    }, {
      key: "dispatchEvent",
      value: function dispatchEvent(event) {
        if (event.type === 'abort') {
          this.aborted = true;

          if (typeof this.onabort === 'function') {
            this.onabort.call(this, event);
          }
        }

        _get(_getPrototypeOf(AbortSignal.prototype), "dispatchEvent", this).call(this, event);
      }
    }]);

    return AbortSignal;
  }(Emitter);
  var AbortController = /*#__PURE__*/function () {
    function AbortController() {
      _classCallCheck(this, AbortController);

      // Compared to assignment, Object.defineProperty makes properties non-enumerable by default and
      // we want Object.keys(new AbortController()) to be [] for compat with the native impl
      Object.defineProperty(this, 'signal', {
        value: new AbortSignal(),
        writable: true,
        configurable: true
      });
    }

    _createClass(AbortController, [{
      key: "abort",
      value: function abort() {
        var event;

        try {
          event = new Event('abort');
        } catch (e) {
          if (typeof document !== 'undefined') {
            if (!document.createEvent) {
              // For Internet Explorer 8:
              event = document.createEventObject();
              event.type = 'abort';
            } else {
              // For Internet Explorer 11:
              event = document.createEvent('Event');
              event.initEvent('abort', false, false);
            }
          } else {
            // Fallback where document isn't available:
            event = {
              type: 'abort',
              bubbles: false,
              cancelable: false
            };
          }
        }

        this.signal.dispatchEvent(event);
      }
    }, {
      key: "toString",
      value: function toString() {
        return '[object AbortController]';
      }
    }]);

    return AbortController;
  }();

  if (typeof Symbol !== 'undefined' && Symbol.toStringTag) {
    // These are necessary to make sure that we get correct output for:
    // Object.prototype.toString.call(new AbortController())
    AbortController.prototype[Symbol.toStringTag] = 'AbortController';
    AbortSignal.prototype[Symbol.toStringTag] = 'AbortSignal';
  }

  function polyfillNeeded(self) {
    if (self.__FORCE_INSTALL_ABORTCONTROLLER_POLYFILL) {
      console.log('__FORCE_INSTALL_ABORTCONTROLLER_POLYFILL=true is set, will force install polyfill');
      return true;
    } // Note that the "unfetch" minimal fetch polyfill defines fetch() without
    // defining window.Request, and this polyfill need to work on top of unfetch
    // so the below feature detection needs the !self.AbortController part.
    // The Request.prototype check is also needed because Safari versions 11.1.2
    // up to and including 12.1.x has a window.AbortController present but still
    // does NOT correctly implement abortable fetch:
    // https://bugs.webkit.org/show_bug.cgi?id=174980#c2


    return typeof self.Request === 'function' && !self.Request.prototype.hasOwnProperty('signal') || !self.AbortController;
  }

  (function (self) {

    if (!polyfillNeeded(self)) {
      return;
    }

    self.AbortController = AbortController;
    self.AbortSignal = AbortSignal;
  })(typeof self !== 'undefined' ? self : global);

})));