source: trip-planner-front/node_modules/@angular/core/esm2015/src/util/lang.js@ 8d391a1

/**
 * @license
 * Copyright Google LLC 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 a Subscribable
 */
export function isSubscribable(obj) {
    return !!obj && typeof obj.subscribe === 'function';
}
/**
 * Determine if the argument is an Observable
 *
 * Strictly this tests that the `obj` is `Subscribable`, since `Observable`
 * types need additional methods, such as `lift()`. But it is adequate for our
 * needs since within the Angular framework code we only ever need to use the
 * `subscribe()` method, and RxJS has mechanisms to wrap `Subscribable` objects
 * into `Observable` as needed.
 */
export const isObservable = isSubscribable;
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