Performance & RxJS suggestions

[reginoprado]

Hi,
This is a very helpful service.
I think the following changes will make it even better in terms of the performance of the app and using more Rxjs operators

Subscribe outside the Angular zone.
Emit the timeout inside the Angular zone (optional, some components maybe does not use OnPush)
Throttling the DOM events every second

stopTimer could be called it stopWatching?

`

      const expired$: Subject<boolean> = new Subject<boolean>();
      const _resetTimerSubj = new BehaviorSubject(1);
      const _stopWatching = new Subject<void>();
      
 constructor(private zone: NgZone) {
  }

  public startWatching(timeOutSeconds): Observable<any> {
     const timeOutMilliSeconds = timeOutSeconds * 1000;
 
  const idleAndTimeout$ = merge(
    this._resetTimerSubj, // for reset timer
    fromEvent(document, 'mousemove'),
    fromEvent(document, 'click'),
    fromEvent(document, 'mousedown'),
    fromEvent(document, 'keypress'),
    fromEvent(document, 'DOMMouseScroll'),
    fromEvent(document, 'mousewheel'),
    fromEvent(document, 'touchmove'),
    fromEvent(document, 'MSPointerMove'),
    fromEvent(window, 'mousemove'),
    fromEvent(window, 'resize')
  ).pipe(
    throttleTime(1000),
    switchMap((x) => timer(timeOutMilliSeconds, timeOutMilliSeconds)),
    takeUntil(this._stopWatching)
  );

  this.zone.runOutsideAngular(() => {
        
         idleAndTimeout$.subscribe({
          next: (x) => {   this.zone.run(() =>this.expired$.next(true) )  },
          error: (err: any) => {  this.zone.run(() => this.expired$.error(err))  },
          complete: () => {  this.zone.run(() => this.expired$.complete() )},
        });

  });
   return  this.expired$.asObservable();
  }

 public resetTimer() {
    this._resetTimerSubj.next(1)
  }
 
 // stopTimer
  public stopWatching() {
   this._stopWatching.next();
  }

`

[reginoprado]

going further I created this rxjs operator. I hope could be helpful

idleTimeout.ts.txt