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

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

  var classCallCheck = function (instance, Constructor) {
    if (!(instance instanceof Constructor)) {
      throw new TypeError("Cannot call a class as a function");
    }
  };

  var createClass = 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);
      }
    }

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

  var get = function get(object, property, receiver) {
    if (object === null) object = Function.prototype;
    var desc = Object.getOwnPropertyDescriptor(object, property);

    if (desc === undefined) {
      var parent = Object.getPrototypeOf(object);

      if (parent === null) {
        return undefined;
      } else {
        return get(parent, property, receiver);
      }
    } else if ("value" in desc) {
      return desc.value;
    } else {
      var getter = desc.get;

      if (getter === undefined) {
        return undefined;
      }

      return getter.call(receiver);
    }
  };

  var inherits = function (subClass, superClass) {
    if (typeof superClass !== "function" && superClass !== null) {
      throw new TypeError("Super expression must either be null or a function, not " + typeof superClass);
    }

    subClass.prototype = Object.create(superClass && superClass.prototype, {
      constructor: {
        value: subClass,
        enumerable: false,
        writable: true,
        configurable: true
      }
    });
    if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass;
  };

  var possibleConstructorReturn = function (self, call) {
    if (!self) {
      throw new ReferenceError("this hasn't been initialised - super() hasn't been called");
    }

    return call && (typeof call === "object" || typeof call === "function") ? call : self;
  };

  var Emitter = function () {
    function Emitter() {
      classCallCheck(this, Emitter);

      this.listeners = {};
    }

    createClass(Emitter, [{
      key: 'addEventListener',
      value: function addEventListener(type, callback) {
        if (!(type in this.listeners)) {
          this.listeners[type] = [];
        }
        this.listeners[type].push(callback);
      }
    }, {
      key: 'removeEventListener',
      value: function removeEventListener(type, callback) {
        if (!(type in this.listeners)) {
          return;
        }
        var stack = this.listeners[type];
        for (var i = 0, l = stack.length; i < l; i++) {
          if (stack[i] === callback) {
            stack.splice(i, 1);
            return;
          }
        }
      }
    }, {
      key: 'dispatchEvent',
      value: function dispatchEvent(event) {
        var _this = this;

        if (!(event.type in this.listeners)) {
          return;
        }
        var debounce = function debounce(callback) {
          setTimeout(function () {
            return callback.call(_this, event);
          });
        };
        var stack = this.listeners[event.type];
        for (var i = 0, l = stack.length; i < l; i++) {
          debounce(stack[i]);
        }
        return !event.defaultPrevented;
      }
    }]);
    return Emitter;
  }();

  var AbortSignal = function (_Emitter) {
    inherits(AbortSignal, _Emitter);

    function AbortSignal() {
      classCallCheck(this, AbortSignal);

      var _this2 = possibleConstructorReturn(this, (AbortSignal.__proto__ || Object.getPrototypeOf(AbortSignal)).call(this));

      _this2.aborted = false;
      _this2.onabort = null;
      return _this2;
    }

    createClass(AbortSignal, [{
      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(AbortSignal.prototype.__proto__ || Object.getPrototypeOf(AbortSignal.prototype), 'dispatchEvent', this).call(this, event);
      }
    }]);
    return AbortSignal;
  }(Emitter);

  var AbortController = function () {
    function AbortController() {
      classCallCheck(this, AbortController);

      this.signal = new AbortSignal();
    }

    createClass(AbortController, [{
      key: 'abort',
      value: function abort() {
        var event = void 0;
        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);

})));