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- (function (global, factory) {
- typeof exports === 'object' && typeof module !== 'undefined' ? factory() :
- typeof define === 'function' && define.amd ? define(factory) :
- (factory());
- }(this, (function () { 'use strict';
-
- /**
- * @this {Promise}
- */
- function finallyConstructor(callback) {
- var constructor = this.constructor;
- return this.then(
- function(value) {
- return constructor.resolve(callback()).then(function() {
- return value;
- });
- },
- function(reason) {
- return constructor.resolve(callback()).then(function() {
- return constructor.reject(reason);
- });
- }
- );
- }
-
- // Store setTimeout reference so promise-polyfill will be unaffected by
- // other code modifying setTimeout (like sinon.useFakeTimers())
- var setTimeoutFunc = setTimeout;
-
- function noop() {}
-
- // Polyfill for Function.prototype.bind
- function bind(fn, thisArg) {
- return function() {
- fn.apply(thisArg, arguments);
- };
- }
-
- /**
- * @constructor
- * @param {Function} fn
- */
- function Promise(fn) {
- if (!(this instanceof Promise))
- throw new TypeError('Promises must be constructed via new');
- if (typeof fn !== 'function') throw new TypeError('not a function');
- /** @type {!number} */
- this._state = 0;
- /** @type {!boolean} */
- this._handled = false;
- /** @type {Promise|undefined} */
- this._value = undefined;
- /** @type {!Array<!Function>} */
- this._deferreds = [];
-
- doResolve(fn, this);
- }
-
- function handle(self, deferred) {
- while (self._state === 3) {
- self = self._value;
- }
- if (self._state === 0) {
- self._deferreds.push(deferred);
- return;
- }
- self._handled = true;
- Promise._immediateFn(function() {
- var cb = self._state === 1 ? deferred.onFulfilled : deferred.onRejected;
- if (cb === null) {
- (self._state === 1 ? resolve : reject)(deferred.promise, self._value);
- return;
- }
- var ret;
- try {
- ret = cb(self._value);
- } catch (e) {
- reject(deferred.promise, e);
- return;
- }
- resolve(deferred.promise, ret);
- });
- }
-
- function resolve(self, newValue) {
- try {
- // Promise Resolution Procedure: https://github.com/promises-aplus/promises-spec#the-promise-resolution-procedure
- if (newValue === self)
- throw new TypeError('A promise cannot be resolved with itself.');
- if (
- newValue &&
- (typeof newValue === 'object' || typeof newValue === 'function')
- ) {
- var then = newValue.then;
- if (newValue instanceof Promise) {
- self._state = 3;
- self._value = newValue;
- finale(self);
- return;
- } else if (typeof then === 'function') {
- doResolve(bind(then, newValue), self);
- return;
- }
- }
- self._state = 1;
- self._value = newValue;
- finale(self);
- } catch (e) {
- reject(self, e);
- }
- }
-
- function reject(self, newValue) {
- self._state = 2;
- self._value = newValue;
- finale(self);
- }
-
- function finale(self) {
- if (self._state === 2 && self._deferreds.length === 0) {
- Promise._immediateFn(function() {
- if (!self._handled) {
- Promise._unhandledRejectionFn(self._value);
- }
- });
- }
-
- for (var i = 0, len = self._deferreds.length; i < len; i++) {
- handle(self, self._deferreds[i]);
- }
- self._deferreds = null;
- }
-
- /**
- * @constructor
- */
- function Handler(onFulfilled, onRejected, promise) {
- this.onFulfilled = typeof onFulfilled === 'function' ? onFulfilled : null;
- this.onRejected = typeof onRejected === 'function' ? onRejected : null;
- this.promise = promise;
- }
-
- /**
- * Take a potentially misbehaving resolver function and make sure
- * onFulfilled and onRejected are only called once.
- *
- * Makes no guarantees about asynchrony.
- */
- function doResolve(fn, self) {
- var done = false;
- try {
- fn(
- function(value) {
- if (done) return;
- done = true;
- resolve(self, value);
- },
- function(reason) {
- if (done) return;
- done = true;
- reject(self, reason);
- }
- );
- } catch (ex) {
- if (done) return;
- done = true;
- reject(self, ex);
- }
- }
-
- Promise.prototype['catch'] = function(onRejected) {
- return this.then(null, onRejected);
- };
-
- Promise.prototype.then = function(onFulfilled, onRejected) {
- // @ts-ignore
- var prom = new this.constructor(noop);
-
- handle(this, new Handler(onFulfilled, onRejected, prom));
- return prom;
- };
-
- Promise.prototype['finally'] = finallyConstructor;
-
- Promise.all = function(arr) {
- return new Promise(function(resolve, reject) {
- if (!arr || typeof arr.length === 'undefined')
- throw new TypeError('Promise.all accepts an array');
- var args = Array.prototype.slice.call(arr);
- if (args.length === 0) return resolve([]);
- var remaining = args.length;
-
- function res(i, val) {
- try {
- if (val && (typeof val === 'object' || typeof val === 'function')) {
- var then = val.then;
- if (typeof then === 'function') {
- then.call(
- val,
- function(val) {
- res(i, val);
- },
- reject
- );
- return;
- }
- }
- args[i] = val;
- if (--remaining === 0) {
- resolve(args);
- }
- } catch (ex) {
- reject(ex);
- }
- }
-
- for (var i = 0; i < args.length; i++) {
- res(i, args[i]);
- }
- });
- };
-
- Promise.resolve = function(value) {
- if (value && typeof value === 'object' && value.constructor === Promise) {
- return value;
- }
-
- return new Promise(function(resolve) {
- resolve(value);
- });
- };
-
- Promise.reject = function(value) {
- return new Promise(function(resolve, reject) {
- reject(value);
- });
- };
-
- Promise.race = function(values) {
- return new Promise(function(resolve, reject) {
- for (var i = 0, len = values.length; i < len; i++) {
- values[i].then(resolve, reject);
- }
- });
- };
-
- // Use polyfill for setImmediate for performance gains
- Promise._immediateFn =
- (typeof setImmediate === 'function' &&
- function(fn) {
- setImmediate(fn);
- }) ||
- function(fn) {
- setTimeoutFunc(fn, 0);
- };
-
- Promise._unhandledRejectionFn = function _unhandledRejectionFn(err) {
- if (typeof console !== 'undefined' && console) {
- console.warn('Possible Unhandled Promise Rejection:', err); // eslint-disable-line no-console
- }
- };
-
- /** @suppress {undefinedVars} */
- var globalNS = (function() {
- // the only reliable means to get the global object is
- // `Function('return this')()`
- // However, this causes CSP violations in Chrome apps.
- if (typeof self !== 'undefined') {
- return self;
- }
- if (typeof window !== 'undefined') {
- return window;
- }
- if (typeof global !== 'undefined') {
- return global;
- }
- throw new Error('unable to locate global object');
- })();
-
- if (!('Promise' in globalNS)) {
- globalNS['Promise'] = Promise;
- } else if (!globalNS.Promise.prototype['finally']) {
- globalNS.Promise.prototype['finally'] = finallyConstructor;
- }
-
- })));
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