typescript, I HATE you!

ME: Trying to extend Subject and override Subject.subscribe(PartialObserver<T>)

ME: export class MySubject<T> extends Subject<T> {
subscribe(obs?:PartialObserver<T>): Subscription {
return super.subscribe(obs);
}
}

ME: compile
TS: Compilation error! No such method to override!

ME: load the app -- ERROR

ME: recompile
TS: Compilation error! No such method to override!

ME: load the app -- works perfectly

:confusedjackie:

Make up your mind! So is that class compileable or not???
If not -- how the fuck does it work then???
If yes -- why the fuck do you yell in my face with all those errors???