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package.esm2022.src.pipes.async_pipe.mjs Maven / Gradle / Ivy

/**
 * @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.dev/license
 */
import { ChangeDetectorRef, Pipe, untracked, ɵisPromise, ɵisSubscribable, } from '@angular/core';
import { invalidPipeArgumentError } from './invalid_pipe_argument_error';
import * as i0 from "@angular/core";
class SubscribableStrategy {
    createSubscription(async, updateLatestValue) {
        // Subscription can be side-effectful, and we don't want any signal reads which happen in the
        // side effect of the subscription to be tracked by a component's template when that
        // subscription is triggered via the async pipe. So we wrap the subscription in `untracked` to
        // decouple from the current reactive context.
        //
        // `untracked` also prevents signal _writes_ which happen in the subscription side effect from
        // being treated as signal writes during the template evaluation (which throws errors).
        return untracked(() => async.subscribe({
            next: updateLatestValue,
            error: (e) => {
                throw e;
            },
        }));
    }
    dispose(subscription) {
        // See the comment in `createSubscription` above on the use of `untracked`.
        untracked(() => subscription.unsubscribe());
    }
}
class PromiseStrategy {
    createSubscription(async, updateLatestValue) {
        return async.then(updateLatestValue, (e) => {
            throw e;
        });
    }
    dispose(subscription) { }
}
const _promiseStrategy = new PromiseStrategy();
const _subscribableStrategy = new SubscribableStrategy();
/**
 * @ngModule CommonModule
 * @description
 *
 * Unwraps a value from an asynchronous primitive.
 *
 * The `async` pipe subscribes to an `Observable` or `Promise` and returns the latest value it has
 * emitted. When a new value is emitted, the `async` pipe marks the component to be checked for
 * changes. When the component gets destroyed, the `async` pipe unsubscribes automatically to avoid
 * potential memory leaks. When the reference of the expression changes, the `async` pipe
 * automatically unsubscribes from the old `Observable` or `Promise` and subscribes to the new one.
 *
 * @usageNotes
 *
 * ### Examples
 *
 * This example binds a `Promise` to the view. Clicking the `Resolve` button resolves the
 * promise.
 *
 * {@example common/pipes/ts/async_pipe.ts region='AsyncPipePromise'}
 *
 * It's also possible to use `async` with Observables. The example below binds the `time` Observable
 * to the view. The Observable continuously updates the view with the current time.
 *
 * {@example common/pipes/ts/async_pipe.ts region='AsyncPipeObservable'}
 *
 * @publicApi
 */
export class AsyncPipe {
    constructor(ref) {
        this._latestValue = null;
        this.markForCheckOnValueUpdate = true;
        this._subscription = null;
        this._obj = null;
        this._strategy = null;
        // Assign `ref` into `this._ref` manually instead of declaring `_ref` in the constructor
        // parameter list, as the type of `this._ref` includes `null` unlike the type of `ref`.
        this._ref = ref;
    }
    ngOnDestroy() {
        if (this._subscription) {
            this._dispose();
        }
        // Clear the `ChangeDetectorRef` and its association with the view data, to mitigate
        // potential memory leaks in Observables that could otherwise cause the view data to
        // be retained.
        // https://github.com/angular/angular/issues/17624
        this._ref = null;
    }
    transform(obj) {
        if (!this._obj) {
            if (obj) {
                try {
                    // Only call `markForCheck` if the value is updated asynchronously.
                    // Synchronous updates _during_ subscription should not wastefully mark for check -
                    // this value is already going to be returned from the transform function.
                    this.markForCheckOnValueUpdate = false;
                    this._subscribe(obj);
                }
                finally {
                    this.markForCheckOnValueUpdate = true;
                }
            }
            return this._latestValue;
        }
        if (obj !== this._obj) {
            this._dispose();
            return this.transform(obj);
        }
        return this._latestValue;
    }
    _subscribe(obj) {
        this._obj = obj;
        this._strategy = this._selectStrategy(obj);
        this._subscription = this._strategy.createSubscription(obj, (value) => this._updateLatestValue(obj, value));
    }
    _selectStrategy(obj) {
        if (ɵisPromise(obj)) {
            return _promiseStrategy;
        }
        if (ɵisSubscribable(obj)) {
            return _subscribableStrategy;
        }
        throw invalidPipeArgumentError(AsyncPipe, obj);
    }
    _dispose() {
        // Note: `dispose` is only called if a subscription has been initialized before, indicating
        // that `this._strategy` is also available.
        this._strategy.dispose(this._subscription);
        this._latestValue = null;
        this._subscription = null;
        this._obj = null;
    }
    _updateLatestValue(async, value) {
        if (async === this._obj) {
            this._latestValue = value;
            if (this.markForCheckOnValueUpdate) {
                this._ref?.markForCheck();
            }
        }
    }
    static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "18.2.6", ngImport: i0, type: AsyncPipe, deps: [{ token: i0.ChangeDetectorRef }], target: i0.ɵɵFactoryTarget.Pipe }); }
    static { this.ɵpipe = i0.ɵɵngDeclarePipe({ minVersion: "14.0.0", version: "18.2.6", ngImport: i0, type: AsyncPipe, isStandalone: true, name: "async", pure: false }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "18.2.6", ngImport: i0, type: AsyncPipe, decorators: [{
            type: Pipe,
            args: [{
                    name: 'async',
                    pure: false,
                    standalone: true,
                }]
        }], ctorParameters: () => [{ type: i0.ChangeDetectorRef }] });
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So we wrap the subscription in `untracked` to\n    // decouple from the current reactive context.\n    //\n    // `untracked` also prevents signal _writes_ which happen in the subscription side effect from\n    // being treated as signal writes during the template evaluation (which throws errors).\n    return untracked(() =>\n      async.subscribe({\n        next: updateLatestValue,\n        error: (e: any) => {\n          throw e;\n        },\n      }),\n    );\n  }\n\n  dispose(subscription: Unsubscribable): void {\n    // See the comment in `createSubscription` above on the use of `untracked`.\n    untracked(() => subscription.unsubscribe());\n  }\n}\n\nclass PromiseStrategy implements SubscriptionStrategy {\n  createSubscription(async: Promise<any>, updateLatestValue: (v: any) => any): Promise<any> {\n    return async.then(updateLatestValue, (e) => {\n      throw e;\n    });\n  }\n\n  dispose(subscription: Promise<any>): void {}\n}\n\nconst _promiseStrategy = new PromiseStrategy();\nconst _subscribableStrategy = new SubscribableStrategy();\n\n/**\n * @ngModule CommonModule\n * @description\n *\n * Unwraps a value from an asynchronous primitive.\n *\n * The `async` pipe subscribes to an `Observable` or `Promise` and returns the latest value it has\n * emitted. When a new value is emitted, the `async` pipe marks the component to be checked for\n * changes. When the component gets destroyed, the `async` pipe unsubscribes automatically to avoid\n * potential memory leaks. When the reference of the expression changes, the `async` pipe\n * automatically unsubscribes from the old `Observable` or `Promise` and subscribes to the new one.\n *\n * @usageNotes\n *\n * ### Examples\n *\n * This example binds a `Promise` to the view. Clicking the `Resolve` button resolves the\n * promise.\n *\n * {@example common/pipes/ts/async_pipe.ts region='AsyncPipePromise'}\n *\n * It's also possible to use `async` with Observables. The example below binds the `time` Observable\n * to the view. The Observable continuously updates the view with the current time.\n *\n * {@example common/pipes/ts/async_pipe.ts region='AsyncPipeObservable'}\n *\n * @publicApi\n */\n@Pipe({\n  name: 'async',\n  pure: false,\n  standalone: true,\n})\nexport class AsyncPipe implements OnDestroy, PipeTransform {\n  private _ref: ChangeDetectorRef | null;\n  private _latestValue: any = null;\n  private markForCheckOnValueUpdate = true;\n\n  private _subscription: Unsubscribable | Promise<any> | null = null;\n  private _obj: Subscribable<any> | Promise<any> | EventEmitter<any> | null = null;\n  private _strategy: SubscriptionStrategy | null = null;\n\n  constructor(ref: ChangeDetectorRef) {\n    // Assign `ref` into `this._ref` manually instead of declaring `_ref` in the constructor\n    // parameter list, as the type of `this._ref` includes `null` unlike the type of `ref`.\n    this._ref = ref;\n  }\n\n  ngOnDestroy(): void {\n    if (this._subscription) {\n      this._dispose();\n    }\n    // Clear the `ChangeDetectorRef` and its association with the view data, to mitigate\n    // potential memory leaks in Observables that could otherwise cause the view data to\n    // be retained.\n    // https://github.com/angular/angular/issues/17624\n    this._ref = null;\n  }\n\n  // NOTE(@benlesh): Because Observable has deprecated a few call patterns for `subscribe`,\n  // TypeScript has a hard time matching Observable to Subscribable, for more information\n  // see https://github.com/microsoft/TypeScript/issues/43643\n\n  transform<T>(obj: Observable<T> | Subscribable<T> | Promise<T>): T | null;\n  transform<T>(obj: null | undefined): null;\n  transform<T>(obj: Observable<T> | Subscribable<T> | Promise<T> | null | undefined): T | null;\n  transform<T>(obj: Observable<T> | Subscribable<T> | Promise<T> | null | undefined): T | null {\n    if (!this._obj) {\n      if (obj) {\n        try {\n          // Only call `markForCheck` if the value is updated asynchronously.\n          // Synchronous updates _during_ subscription should not wastefully mark for check -\n          // this value is already going to be returned from the transform function.\n          this.markForCheckOnValueUpdate = false;\n          this._subscribe(obj);\n        } finally {\n          this.markForCheckOnValueUpdate = true;\n        }\n      }\n      return this._latestValue;\n    }\n\n    if (obj !== this._obj) {\n      this._dispose();\n      return this.transform(obj);\n    }\n\n    return this._latestValue;\n  }\n\n  private _subscribe(obj: Subscribable<any> | Promise<any> | EventEmitter<any>): void {\n    this._obj = obj;\n    this._strategy = this._selectStrategy(obj);\n    this._subscription = this._strategy.createSubscription(obj, (value: Object) =>\n      this._updateLatestValue(obj, value),\n    );\n  }\n\n  private _selectStrategy(\n    obj: Subscribable<any> | Promise<any> | EventEmitter<any>,\n  ): SubscriptionStrategy {\n    if (ɵisPromise(obj)) {\n      return _promiseStrategy;\n    }\n\n    if (ɵisSubscribable(obj)) {\n      return _subscribableStrategy;\n    }\n\n    throw invalidPipeArgumentError(AsyncPipe, obj);\n  }\n\n  private _dispose(): void {\n    // Note: `dispose` is only called if a subscription has been initialized before, indicating\n    // that `this._strategy` is also available.\n    this._strategy!.dispose(this._subscription!);\n    this._latestValue = null;\n    this._subscription = null;\n    this._obj = null;\n  }\n\n  private _updateLatestValue(async: any, value: Object): void {\n    if (async === this._obj) {\n      this._latestValue = value;\n      if (this.markForCheckOnValueUpdate) {\n        this._ref?.markForCheck();\n      }\n    }\n  }\n}\n"]}