rxjs.ts

  ngAfterViewInit() {
            // server-side search
        fromEvent(this.input.nativeElement,'keyup')
            .pipe(
                untilDestroyed(this),
                filter(Boolean),
                debounceTime(150),
                distinctUntilChanged(),
                tap(async (event:KeyboardEvent) => {
                  console.log(`The input value is ${this.input.nativeElement.value}`);
                })
            )
            .subscribe();
  }