@angular/core
Version:
Angular - the core framework
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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, assertNotInReactiveContext, computed, DestroyRef, inject, signal, ɵRuntimeError } from '@angular/core';
/**
* Get the current value of an `Observable` as a reactive `Signal`.
*
* `toSignal` returns a `Signal` which provides synchronous reactive access to values produced
* by the given `Observable`, by subscribing to that `Observable`. The returned `Signal` will always
* have the most recent value emitted by the subscription, and will throw an error if the
* `Observable` errors.
*
* With `requireSync` set to `true`, `toSignal` will assert that the `Observable` produces a value
* immediately upon subscription. No `initialValue` is needed in this case, and the returned signal
* does not include an `undefined` type.
*
* By default, the subscription will be automatically cleaned up when the current [injection
* context](/guide/dependency-injection-context) is destroyed. For example, when `toObservable` is
* called during the construction of a component, the subscription will be cleaned up when the
* component is destroyed. If an injection context is not available, an explicit `Injector` can be
* passed instead.
*
* If the subscription should persist until the `Observable` itself completes, the `manualCleanup`
* option can be specified instead, which disables the automatic subscription teardown. No injection
* context is needed in this configuration as well.
*
* @developerPreview
*/
export function toSignal(source, options) {
ngDevMode &&
assertNotInReactiveContext(toSignal, 'Invoking `toSignal` causes new subscriptions every time. ' +
'Consider moving `toSignal` outside of the reactive context and read the signal value where needed.');
const requiresCleanup = !options?.manualCleanup;
requiresCleanup && !options?.injector && assertInInjectionContext(toSignal);
const cleanupRef = requiresCleanup ? options?.injector?.get(DestroyRef) ?? inject(DestroyRef) : null;
// Note: T is the Observable value type, and U is the initial value type. They don't have to be
// the same - the returned signal gives values of type `T`.
let state;
if (options?.requireSync) {
// Initially the signal is in a `NoValue` state.
state = signal({ kind: 0 /* StateKind.NoValue */ });
}
else {
// If an initial value was passed, use it. Otherwise, use `undefined` as the initial value.
state = signal({ kind: 1 /* StateKind.Value */, value: options?.initialValue });
}
// Note: This code cannot run inside a reactive context (see assertion above). If we'd support
// this, we would subscribe to the observable outside of the current reactive context, avoiding
// that side-effect signal reads/writes are attribute to the current consumer. The current
// consumer only needs to be notified when the `state` signal changes through the observable
// subscription. Additional context (related to async pipe):
// https://github.com/angular/angular/pull/50522.
const sub = source.subscribe({
next: value => state.set({ kind: 1 /* StateKind.Value */, value }),
error: error => {
if (options?.rejectErrors) {
// Kick the error back to RxJS. It will be caught and rethrown in a macrotask, which causes
// the error to end up as an uncaught exception.
throw error;
}
state.set({ kind: 2 /* StateKind.Error */, error });
},
// Completion of the Observable is meaningless to the signal. Signals don't have a concept of
// "complete".
});
if (ngDevMode && options?.requireSync && state().kind === 0 /* StateKind.NoValue */) {
throw new ɵRuntimeError(601 /* ɵRuntimeErrorCode.REQUIRE_SYNC_WITHOUT_SYNC_EMIT */, '`toSignal()` called with `requireSync` but `Observable` did not emit synchronously.');
}
// Unsubscribe when the current context is destroyed, if requested.
cleanupRef?.onDestroy(sub.unsubscribe.bind(sub));
// The actual returned signal is a `computed` of the `State` signal, which maps the various states
// to either values or errors.
return computed(() => {
const current = state();
switch (current.kind) {
case 1 /* StateKind.Value */:
return current.value;
case 2 /* StateKind.Error */:
throw current.error;
case 0 /* StateKind.NoValue */:
// This shouldn't really happen because the error is thrown on creation.
// TODO(alxhub): use a RuntimeError when we finalize the error semantics
throw new ɵRuntimeError(601 /* ɵRuntimeErrorCode.REQUIRE_SYNC_WITHOUT_SYNC_EMIT */, '`toSignal()` called with `requireSync` but `Observable` did not emit synchronously.');
}
});
}
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Setting this option removes the need to either deal with `undefined` in the\n   * signal type or provide an `initialValue`, at the cost of a runtime error if this requirement is\n   * not met.\n   */\n  requireSync?: boolean;\n\n  /**\n   * `Injector` which will provide the `DestroyRef` used to clean up the Observable subscription.\n   *\n   * If this is not provided, a `DestroyRef` will be retrieved from the current [injection\n   * context](/guide/dependency-injection-context), unless manual cleanup is requested.\n   */\n  injector?: Injector;\n\n  /**\n   * Whether the subscription should be automatically cleaned up (via `DestroyRef`) when\n   * `toObservable`'s creation context is destroyed.\n   *\n   * If manual cleanup is enabled, then `DestroyRef` is not used, and the subscription will persist\n   * until the `Observable` itself completes.\n   */\n  manualCleanup?: boolean;\n\n  /**\n   * Whether `toSignal` should throw errors from the Observable error channel back to RxJS, where\n   * they'll be processed as uncaught exceptions.\n   *\n   * In practice, this means that the signal returned by `toSignal` will keep returning the last\n   * good value forever, as Observables which error produce no further values. This option emulates\n   * the behavior of the `async` pipe.\n   */\n  rejectErrors?: boolean;\n}\n\n// Base case: no options -> `undefined` in the result type.\nexport function toSignal<T>(source: Observable<T>|Subscribable<T>): Signal<T|undefined>;\n// Options with `undefined` initial value and no `requiredSync` -> `undefined`.\nexport function toSignal<T>(\n    source: Observable<T>|Subscribable<T>,\n    options: ToSignalOptions&{initialValue?: undefined, requireSync?: false}): Signal<T|undefined>;\n// Options with `null` initial value -> `null`.\nexport function toSignal<T>(\n    source: Observable<T>|Subscribable<T>,\n    options: ToSignalOptions&{initialValue?: null, requireSync?: false}): Signal<T|null>;\n// Options with `undefined` initial value and `requiredSync` -> strict result type.\nexport function toSignal<T>(\n    source: Observable<T>|Subscribable<T>,\n    options: ToSignalOptions&{initialValue?: undefined, requireSync: true}): Signal<T>;\n// Options with a more specific initial value type.\nexport function toSignal<T, const U extends T>(\n    source: Observable<T>|Subscribable<T>,\n    options: ToSignalOptions&{initialValue: U, requireSync?: false}): Signal<T|U>;\n\n/**\n * Get the current value of an `Observable` as a reactive `Signal`.\n *\n * `toSignal` returns a `Signal` which provides synchronous reactive access to values produced\n * by the given `Observable`, by subscribing to that `Observable`. The returned `Signal` will always\n * have the most recent value emitted by the subscription, and will throw an error if the\n * `Observable` errors.\n *\n * With `requireSync` set to `true`, `toSignal` will assert that the `Observable` produces a value\n * immediately upon subscription. No `initialValue` is needed in this case, and the returned signal\n * does not include an `undefined` type.\n *\n * By default, the subscription will be automatically cleaned up when the current [injection\n * context](/guide/dependency-injection-context) is destroyed. For example, when `toObservable` is\n * called during the construction of a component, the subscription will be cleaned up when the\n * component is destroyed. If an injection context is not available, an explicit `Injector` can be\n * passed instead.\n *\n * If the subscription should persist until the `Observable` itself completes, the `manualCleanup`\n * option can be specified instead, which disables the automatic subscription teardown. No injection\n * context is needed in this configuration as well.\n *\n * @developerPreview\n */\nexport function toSignal<T, U = undefined>(\n    source: Observable<T>|Subscribable<T>,\n    options?: ToSignalOptions&{initialValue?: U}): Signal<T|U> {\n  ngDevMode &&\n      assertNotInReactiveContext(\n          toSignal,\n          'Invoking `toSignal` causes new subscriptions every time. ' +\n              'Consider moving `toSignal` outside of the reactive context and read the signal value where needed.');\n\n  const requiresCleanup = !options?.manualCleanup;\n  requiresCleanup && !options?.injector && assertInInjectionContext(toSignal);\n  const cleanupRef =\n      requiresCleanup ? options?.injector?.get(DestroyRef) ?? inject(DestroyRef) : null;\n\n  // Note: T is the Observable value type, and U is the initial value type. They don't have to be\n  // the same - the returned signal gives values of type `T`.\n  let state: WritableSignal<State<T|U>>;\n  if (options?.requireSync) {\n    // Initially the signal is in a `NoValue` state.\n    state = signal({kind: StateKind.NoValue});\n  } else {\n    // If an initial value was passed, use it. Otherwise, use `undefined` as the initial value.\n    state = signal<State<T|U>>({kind: StateKind.Value, value: options?.initialValue as U});\n  }\n\n  // Note: This code cannot run inside a reactive context (see assertion above). If we'd support\n  // this, we would subscribe to the observable outside of the current reactive context, avoiding\n  // that side-effect signal reads/writes are attribute to the current consumer. The current\n  // consumer only needs to be notified when the `state` signal changes through the observable\n  // subscription. Additional context (related to async pipe):\n  // https://github.com/angular/angular/pull/50522.\n  const sub = source.subscribe({\n    next: value => state.set({kind: StateKind.Value, value}),\n    error: error => {\n      if (options?.rejectErrors) {\n        // Kick the error back to RxJS. It will be caught and rethrown in a macrotask, which causes\n        // the error to end up as an uncaught exception.\n        throw error;\n      }\n      state.set({kind: StateKind.Error, error});\n    },\n    // Completion of the Observable is meaningless to the signal. Signals don't have a concept of\n    // \"complete\".\n  });\n\n  if (ngDevMode && options?.requireSync && state().kind === StateKind.NoValue) {\n    throw new ɵRuntimeError(\n        ɵRuntimeErrorCode.REQUIRE_SYNC_WITHOUT_SYNC_EMIT,\n        '`toSignal()` called with `requireSync` but `Observable` did not emit synchronously.');\n  }\n\n  // Unsubscribe when the current context is destroyed, if requested.\n  cleanupRef?.onDestroy(sub.unsubscribe.bind(sub));\n\n  // The actual returned signal is a `computed` of the `State` signal, which maps the various states\n  // to either values or errors.\n  return computed(() => {\n    const current = state();\n    switch (current.kind) {\n      case StateKind.Value:\n        return current.value;\n      case StateKind.Error:\n        throw current.error;\n      case StateKind.NoValue:\n        // This shouldn't really happen because the error is thrown on creation.\n        // TODO(alxhub): use a RuntimeError when we finalize the error semantics\n        throw new ɵRuntimeError(\n            ɵRuntimeErrorCode.REQUIRE_SYNC_WITHOUT_SYNC_EMIT,\n            '`toSignal()` called with `requireSync` but `Observable` did not emit synchronously.');\n    }\n  });\n}\n\nconst enum StateKind {\n  NoValue,\n  Value,\n  Error,\n}\n\ninterface NoValueState {\n  kind: StateKind.NoValue;\n}\n\ninterface ValueState<T> {\n  kind: StateKind.Value;\n  value: T;\n}\n\ninterface ErrorState {\n  kind: StateKind.Error;\n  error: unknown;\n}\n\ntype State<T> = NoValueState|ValueState<T>|ErrorState;\n"]}