export class InnerComponentUsingEventsComponent implements OnInit, OnDestroy {

  @Input() parentEventEmmiter: EventEmitter< ((x:number) => number )>;

  constructor() {}

  ngOnInit() {
    this.parentEventEmmiter.subscribe(
      func => {
        console.log(func(1));
      }
    )
  }

  ngOnDestroy(){
    this.parentEventEmmiter.complete();
  }
}