47bfec4e46
This commit adds generic to `isPromise` function to help with type inference. PR Close #34168
39 lines
1.1 KiB
TypeScript
39 lines
1.1 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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export function stripPrefix(val: string, prefix: string): string {
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return val.startsWith(prefix) ? val.substring(prefix.length) : val;
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}
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export function deepEqual(a: any, b: any): boolean {
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if (a === b) {
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return true;
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} else if (!a || !b) {
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return false;
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} else {
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try {
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if ((a.prototype !== b.prototype) || (Array.isArray(a) && Array.isArray(b))) {
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return false;
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}
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return JSON.stringify(a) === JSON.stringify(b);
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} catch (e) {
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return false;
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}
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}
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}
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export function isAnchor(el: (Node & ParentNode) | Element | null): el is HTMLAnchorElement {
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return (<HTMLAnchorElement>el).href !== undefined;
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}
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export function isPromise<T = any>(obj: any): obj is Promise<T> {
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// allow any Promise/A+ compliant thenable.
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// It's up to the caller to ensure that obj.then conforms to the spec
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return !!obj && typeof obj.then === 'function';
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}
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