@angular/core
Version:
Angular - the core framework
40 lines • 5.25 kB
JavaScript
/**
* @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
*/
import { assertInInjectionContext, DestroyRef, effect, inject, Injector, untracked, } from '@angular/core';
import { ReplaySubject } from 'rxjs';
/**
* Exposes the value of an Angular `Signal` as an RxJS `Observable`.
*
* The signal's value will be propagated into the `Observable`'s subscribers using an `effect`.
*
* `toObservable` must be called in an injection context unless an injector is provided via options.
*
* @developerPreview
*/
export function toObservable(source, options) {
!options?.injector && assertInInjectionContext(toObservable);
const injector = options?.injector ?? inject(Injector);
const subject = new ReplaySubject(1);
const watcher = effect(() => {
let value;
try {
value = source();
}
catch (err) {
untracked(() => subject.error(err));
return;
}
untracked(() => subject.next(value));
}, { injector, manualCleanup: true });
injector.get(DestroyRef).onDestroy(() => {
watcher.destroy();
subject.complete();
});
return subject.asObservable();
}
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