unsubscribe is not a function on an observable

Here is my Observable

this.mouseMove$ = Observable.fromEvent(document, 'mousemove')


With this implementation, I have no problem subscribing in this way:

this.mouseMove$.subscribe();


However, I cannot seem to unsubscribe in either of the following ways:

this.mouseMove$.unsubscribe();
this.mouseMove$.dispose();


In both cases, I get the following type of error:

TypeError: this.mouseMove$.unsubscribe is not a function ...
​

I'm unsure if this has to do with the mouseMove$ type of any, but setting the type as Observable and Observable<MouseEvent> did not work. What am I not understanding here?

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