Sometimes, when composing multiple observables, you might need to create an empty observable. You can do this in RxJS using two different methods. The first one is the empty() method; this method will only fire an onComplete event.
The following code creates an observable that finishes and doesn't propagate any value:
Sometimes you might need an observable that wouldn't emit any value and would never terminate. To create this kind of observable, you can use the never() method: