58 lines
2.0 KiB
TypeScript
58 lines
2.0 KiB
TypeScript
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/**
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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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import {zoneSymbol} from './utils';
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// override Function.prototype.toString to make zone.js patched function
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// look like native function
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Zone.__load_patch('toString', (global: any) => {
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// patch Func.prototype.toString to let them look like native
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const originalFunctionToString = Function.prototype.toString;
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const ORIGINAL_DELEGATE_SYMBOL = zoneSymbol('OriginalDelegate');
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const PROMISE_SYMBOL = zoneSymbol('Promise');
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const ERROR_SYMBOL = zoneSymbol('Error');
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const newFunctionToString = function toString() {
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if (typeof this === 'function') {
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const originalDelegate = this[ORIGINAL_DELEGATE_SYMBOL];
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if (originalDelegate) {
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if (typeof originalDelegate === 'function') {
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return originalFunctionToString.call(originalDelegate);
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} else {
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return Object.prototype.toString.call(originalDelegate);
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}
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}
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if (this === Promise) {
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const nativePromise = global[PROMISE_SYMBOL];
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if (nativePromise) {
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return originalFunctionToString.call(nativePromise);
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}
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}
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if (this === Error) {
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const nativeError = global[ERROR_SYMBOL];
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if (nativeError) {
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return originalFunctionToString.call(nativeError);
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}
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}
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}
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return originalFunctionToString.call(this);
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};
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(newFunctionToString as any)[ORIGINAL_DELEGATE_SYMBOL] = originalFunctionToString;
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Function.prototype.toString = newFunctionToString;
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// patch Object.prototype.toString to let them look like native
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const originalObjectToString = Object.prototype.toString;
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const PROMISE_OBJECT_TO_STRING = '[object Promise]';
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Object.prototype.toString = function() {
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if (this instanceof Promise) {
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return PROMISE_OBJECT_TO_STRING;
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}
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return originalObjectToString.call(this);
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};
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});
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