@angular/core/rxjs-interop

toObservable

function

stablesince v20.0

Exposes the value of an Angular Signal as an RxJS Observable. As it reflects a state, the observable will always emit the latest value upon subscription.

API

function toObservable<T>(
  source: Signal<T>,
  options?: ToObservableOptions | undefined,
): Observable<T>;

@paramsourceSignal<T>

@paramoptionsToObservableOptions | undefined

@returnsObservable<T>

Description

Exposes the value of an Angular Signal as an RxJS Observable. As it reflects a state, the observable will always emit the latest value upon subscription.

The signal's value will be propagated into the Observable's subscribers using an effect. Because the effect runs asynchronously, the observable is not guaranteed to be immediately synchronized when the signal is updated. If the signal is updated multiple times before the effect runs, the observable will only emit the last signal value.

toObservable must be called in an injection context unless an injector is provided via options.