For the Angular router events Observable, why is there no unsubscribe()?

Issue

In my ngOnInit method I am subscribing to the Router like this:

this.router.events.subscribe(
  event => {
    if (event instanceof NavigationEnd) this.clearMessages();
  }
);

Normally, for Observables outside of the HttpClient package I call unsubscribe in the ngOnDestroy method but when I tried that here I discovered that this.router.events does not have such a method. Am I mistaken or is there something different about this Observable? Why would unsubscribe not be implemented?

Solution

I discovered that this.router.events does not have such a method

You call unsubscribe on subscriptions, not observables. And this.router.events is an observable, not subscription. So the following would work:

const subscription = this.router.events.subscribe(...);   
subscription.unsubscribe();

Answered By - Max Koretskyi