(function (factory) {
typeof define === 'function' && define.amd ? define(factory) :
factory();
}((function () { 'use strict';
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 _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 _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;
}
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);
}
var Emitter = /*#__PURE__*/function () {
function Emitter() {
_classCallCheck(this, Emitter);
Object.defineProperty(this, 'listeners', {
value: {},
writable: true,
configurable: true
});
}
_createClass(Emitter, [{
key: "addEventListener",
value: function addEventListener(type, callback, options) {
if (!(type in this.listeners)) {
this.listeners[type] = [];
}
this.listeners[type].push({
callback: callback,
options: options
});
}
}, {
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 === callback) {
stack.splice(i, 1);
return;
}
}
}
}, {
key: "dispatchEvent",
value: function dispatchEvent(event) {
if (!(event.type in this.listeners)) {
return;
}
var stack = this.listeners[event.type];
var stackToCall = stack.slice();
for (var i = 0, l = stackToCall.length; i < l; i++) {
var listener = stackToCall[i];
try {
listener.callback.call(this, event);
} catch (e) {
Promise.resolve().then(function () {
throw e;
});
}
if (listener.options && listener.options.once) {
this.removeEventListener(event.type, listener.callback);
}
}
return !event.defaultPrevented;
}
}]);
return Emitter;
}();
var AbortSignal = /*#__PURE__*/function (_Emitter) {
_inherits(AbortSignal, _Emitter);
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;
}
_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(_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;
}
/**
* Note: the "fetch.Request" default value is available for fetch imported from
* the "node-fetch" package and not in browsers. This is OK since browsers
* will be importing umd-polyfill.js from that path "self" is passed the
* decorator so the default value will not be used (because browsers that define
* fetch also has Request). One quirky setup where self.fetch exists but
* self.Request does not is when the "unfetch" minimal fetch polyfill is used
* on top of IE11; for this case the browser will try to use the fetch.Request
* default value which in turn will be undefined but then then "if (Request)"
* will ensure that you get a patched fetch but still no Request (as expected).
* @param {fetch, Request = fetch.Request}
* @returns {fetch: abortableFetch, Request: AbortableRequest}
*/
function abortableFetchDecorator(patchTargets) {
if ('function' === typeof patchTargets) {
patchTargets = {
fetch: patchTargets
};
}
var _patchTargets = patchTargets,
fetch = _patchTargets.fetch,
_patchTargets$Request = _patchTargets.Request,
NativeRequest = _patchTargets$Request === void 0 ? fetch.Request : _patchTargets$Request,
NativeAbortController = _patchTargets.AbortController,
_patchTargets$__FORCE = _patchTargets.__FORCE_INSTALL_ABORTCONTROLLER_POLYFILL,
__FORCE_INSTALL_ABORTCONTROLLER_POLYFILL = _patchTargets$__FORCE === void 0 ? false : _patchTargets$__FORCE;
if (!polyfillNeeded({
fetch: fetch,
Request: NativeRequest,
AbortController: NativeAbortController,
__FORCE_INSTALL_ABORTCONTROLLER_POLYFILL: __FORCE_INSTALL_ABORTCONTROLLER_POLYFILL
})) {
return {
fetch: fetch,
Request: Request
};
}
var Request = NativeRequest; // Note that the "unfetch" minimal fetch polyfill defines fetch() without
// defining window.Request, and this polyfill need to work on top of unfetch
// hence we only patch it if it's available. Also we don't patch it if signal
// is already available on the Request prototype because in this case support
// is present and the patching below can cause a crash since it assigns to
// request.signal which is technically a read-only property. This latter error
// happens when you run the main5.js node-fetch example in the repo
// "abortcontroller-polyfill-examples". The exact error is:
// request.signal = init.signal;
// ^
// TypeError: Cannot set property signal of #<Request> which has only a getter
if (Request && !Request.prototype.hasOwnProperty('signal') || __FORCE_INSTALL_ABORTCONTROLLER_POLYFILL) {
Request = function Request(input, init) {
var signal;
if (init && init.signal) {
signal = init.signal; // Never pass init.signal to the native Request implementation when the polyfill has
// been installed because if we're running on top of a browser with a
// working native AbortController (i.e. the polyfill was installed due to
// __FORCE_INSTALL_ABORTCONTROLLER_POLYFILL being set), then passing our
// fake AbortSignal to the native fetch will trigger:
// TypeError: Failed to construct 'Request': member signal is not of type AbortSignal.
delete init.signal;
}
var request = new NativeRequest(input, init);
if (signal) {
Object.defineProperty(request, 'signal', {
writable: false,
enumerable: false,
configurable: true,
value: signal
});
}
return request;
};
Request.prototype = NativeRequest.prototype;
}
var realFetch = fetch;
var abortableFetch = function abortableFetch(input, init) {
var signal = Request && Request.prototype.isPrototypeOf(input) ? input.signal : init ? init.signal : undefined;
if (signal) {
var abortError;
try {
abortError = new DOMException('Aborted', 'AbortError');
} catch (err) {
// IE 11 does not support calling the DOMException constructor, use a
// regular error object on it instead.
abortError = new Error('Aborted');
abortError.name = 'AbortError';
} // Return early if already aborted, thus avoiding making an HTTP request
if (signal.aborted) {
return Promise.reject(abortError);
} // Turn an event into a promise, reject it once `abort` is dispatched
var cancellation = new Promise(function (_, reject) {
signal.addEventListener('abort', function () {
return reject(abortError);
}, {
once: true
});
});
if (init && init.signal) {
// Never pass .signal to the native implementation when the polyfill has
// been installed because if we're running on top of a browser with a
// working native AbortController (i.e. the polyfill was installed due to
// __FORCE_INSTALL_ABORTCONTROLLER_POLYFILL being set), then passing our
// fake AbortSignal to the native fetch will trigger:
// TypeError: Failed to execute 'fetch' on 'Window': member signal is not of type AbortSignal.
delete init.signal;
} // Return the fastest promise (don't need to wait for request to finish)
return Promise.race([cancellation, realFetch(input, init)]);
}
return realFetch(input, init);
};
return {
fetch: abortableFetch,
Request: Request
};
}
(function (self) {
if (!polyfillNeeded(self)) {
return;
}
if (!self.fetch) {
console.warn('fetch() is not available, cannot install abortcontroller-polyfill');
return;
}
var _abortableFetch = abortableFetchDecorator(self),
fetch = _abortableFetch.fetch,
Request = _abortableFetch.Request;
self.fetch = fetch;
self.Request = Request;
Object.defineProperty(self, 'AbortController', {
writable: true,
enumerable: false,
configurable: true,
value: AbortController
});
Object.defineProperty(self, 'AbortSignal', {
writable: true,
enumerable: false,
configurable: true,
value: AbortSignal
});
})(typeof self !== 'undefined' ? self : global);
})));