Observer is an interface for a consumer of push-based notifications delivered by an Observable. It has below structure,
interface Observer<T> { closed?: boolean; next: (value: T) => void; error: (err: any) => void; complete: () => void; }
A handler that implements the Observer interface for receiving observable notifications will be passed as a parameter for observable as below,
myObservable.subscribe(myObserver);
Note: If you don't supply a handler for a notification type, the observer ignores notifications of that type.