@angular/core/esm2022/rxjs-interop/src/output_from_observable.mjs

Angular - the core framework

/**
 * @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, inject, ɵRuntimeError, } from '@angular/core';
import { takeUntilDestroyed } from './take_until_destroyed';
/**
 * Implementation of `OutputRef` that emits values from
 * an RxJS observable source.
 *
 * @internal
 */
class OutputFromObservableRef {
    constructor(source) {
        this.source = source;
        this.destroyed = false;
        this.destroyRef = inject(DestroyRef);
        this.destroyRef.onDestroy(() => {
            this.destroyed = true;
        });
    }
    subscribe(callbackFn) {
        if (this.destroyed) {
            throw new ɵRuntimeError(953 /* ɵRuntimeErrorCode.OUTPUT_REF_DESTROYED */, ngDevMode &&
                'Unexpected subscription to destroyed `OutputRef`. ' +
                    'The owning directive/component is destroyed.');
        }
        // Stop yielding more values when the directive/component is already destroyed.
        const subscription = this.source.pipe(takeUntilDestroyed(this.destroyRef)).subscribe({
            next: (value) => callbackFn(value),
        });
        return {
            unsubscribe: () => subscription.unsubscribe(),
        };
    }
}
/**
 * Declares an Angular output that is using an RxJS observable as a source
 * for events dispatched to parent subscribers.
 *
 * The behavior for an observable as source is defined as followed:
 *    1. New values are forwarded to the Angular output (next notifications).
 *    2. Errors notifications are not handled by Angular. You need to handle these manually.
 *       For example by using `catchError`.
 *    3. Completion notifications stop the output from emitting new values.
 *
 * @usageNotes
 * Initialize an output in your directive by declaring a
 * class field and initializing it with the `outputFromObservable()` function.
 *
 * ```ts
 * @Directive({..})
 * export class MyDir {
 *   nameChange$ = <some-observable>;
 *   nameChange = outputFromObservable(this.nameChange$);
 * }
 * ```
 *
 * @developerPreview
 */
export function outputFromObservable(observable, opts) {
    ngDevMode && assertInInjectionContext(outputFromObservable);
    return new OutputFromObservableRef(observable);
}
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Fzc2VydEluSW5qZWN0aW9uQ29udGV4dChvdXRwdXRGcm9tT2JzZXJ2YWJsZSk7XG4gIHJldHVybiBuZXcgT3V0cHV0RnJvbU9ic2VydmFibGVSZWY8VD4ob2JzZXJ2YWJsZSk7XG59XG4iXX0=