Does Angular automatically unsubscribe FormControl.value subscriptions?

Question

I'm looking at this code snippet that uses untilDestroyed:

      this.control.valueChanges.pipe(untilDestroyed(this)).subscribe(c => {
        this.update.emit(c);
      });
    }

Does Angular automatically unsubscribe the FormControl.valueChanges observable on component destruction, or do we need the operator?

Part of the reason I ask is that my understanding is that Angular unsubscribes Observables used in template expressions automatically, so I thought perhaps it might have a "Magic" way of doing it for FormControl instances as well?

Possible duplicate of [Angular 2 - Does subscribing to FormControl's valueChanges need an unsubscribe?](https://stackoverflow.com/questions/41364078/angular-2-does-subscribing-to-formcontrols-valuechanges-need-an-unsubscribe) — ggradnig, Sep 06 '18 at 08:13

score 1 · Accepted Answer · answered Sep 06 '18 at 05:06

1

You should unsubscribe in ngOnDestroy component callback.

Since stream is never closed, subscription will stay.

answered Sep 06 '18 at 05:06

Antoniossss

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Does Angular automatically unsubscribe FormControl.value subscriptions?

1 Answers1