import { Observable } from "rxjs/Observable" ; declare function fetch ( url ) ; export function initObservable ( ) { const click$ = Observable . fromEvent ( document , 'click' ) ; const mouse$ = Observable . fromEvent ( document , 'mousemove' ) . filter ( ( move ) => move . clientY >= 200 ) ; const combined$ = Observable . combineLatest ( mouse$ , click$ ) ; }