[AngularJS] startWith does not exist on type Subject

[Paulo Silva]

I got this code below
resetTimer$ = new Subject();

  ngOnInit() {
    this.resetTimer$
      startWith(null)
      .takeUntil(this.destroyed$)
      .switchMap(t => Observable.timer(5000, 5000))
      .subscribe(() => this.next())
  }

I'm using  Angular 10 and i'm getting this error:

> startWith does not exist on type Subject<unknow>


How can i solve this problem? 

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