68 lines
2.3 KiB
TypeScript
68 lines
2.3 KiB
TypeScript
/**
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* @license
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* Copyright Google Inc. All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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/**
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* Promise for async/fakeAsync zoneSpec test
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* can support async operation which not supported by zone.js
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* such as
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* it ('test jsonp in AsyncZone', async() => {
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* new Promise(res => {
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* jsonp(url, (data) => {
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* // success callback
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* res(data);
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* });
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* }).then((jsonpResult) => {
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* // get jsonp result.
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*
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* // user will expect AsyncZoneSpec wait for
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* // then, but because jsonp is not zone aware
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* // AsyncZone will finish before then is called.
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* });
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* });
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*/
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Zone.__load_patch('promisefortest', (global: any, Zone: ZoneType, api: _ZonePrivate) => {
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const symbolState: string = api.symbol('state');
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const UNRESOLVED: null = null;
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const symbolParentUnresolved = api.symbol('parentUnresolved');
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// patch Promise.prototype.then to keep an internal
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// number for tracking unresolved chained promise
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// we will decrease this number when the parent promise
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// being resolved/rejected and chained promise was
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// scheduled as a microTask.
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// so we can know such kind of chained promise still
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// not resolved in AsyncTestZone
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(Promise as any)[api.symbol('patchPromiseForTest')] = function patchPromiseForTest() {
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let oriThen = (Promise as any)[Zone.__symbol__('ZonePromiseThen')];
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if (oriThen) {
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return;
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}
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oriThen = (Promise as any)[Zone.__symbol__('ZonePromiseThen')] = Promise.prototype.then;
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Promise.prototype.then = function() {
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const chained = oriThen.apply(this, arguments);
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if (this[symbolState] === UNRESOLVED) {
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// parent promise is unresolved.
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const asyncTestZoneSpec = Zone.current.get('AsyncTestZoneSpec');
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if (asyncTestZoneSpec) {
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asyncTestZoneSpec.unresolvedChainedPromiseCount++;
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chained[symbolParentUnresolved] = true;
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}
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}
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return chained;
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};
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};
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(Promise as any)[api.symbol('unPatchPromiseForTest')] = function unpatchPromiseForTest() {
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// restore origin then
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const oriThen = (Promise as any)[Zone.__symbol__('ZonePromiseThen')];
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if (oriThen) {
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Promise.prototype.then = oriThen;
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(Promise as any)[Zone.__symbol__('ZonePromiseThen')] = undefined;
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}
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};
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}); |