@angular/core
Version:
Angular - the core framework
24 lines • 2.64 kB
JavaScript
/**
* @license
* Copyright Google Inc. All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
/**
* Determine if the argument is shaped like a Promise
*/
export function isPromise(obj) {
// allow any Promise/A+ compliant thenable.
// It's up to the caller to ensure that obj.then conforms to the spec
return !!obj && typeof obj.then === 'function';
}
/**
* Determine if the argument is an Observable
*/
export function isObservable(obj) {
// TODO: use isObservable once we update pass rxjs 6.1
// https://github.com/ReactiveX/rxjs/blob/master/CHANGELOG.md#610-2018-05-03
return !!obj && typeof obj.subscribe === 'function';
}
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