47bfec4e46
This commit adds generic to `isPromise` function to help with type inference. PR Close #34168
28 lines
867 B
TypeScript
28 lines
867 B
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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import {Observable} from 'rxjs';
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/**
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* Determine if the argument is shaped like a Promise
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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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/**
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* Determine if the argument is an Observable
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*/
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export function isObservable(obj: any | Observable<any>): obj is Observable<any> {
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// TODO: use isObservable once we update pass rxjs 6.1
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// https://github.com/ReactiveX/rxjs/blob/master/CHANGELOG.md#610-2018-05-03
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return !!obj && typeof obj.subscribe === 'function';
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}
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