how to generate javascript event when the html element width change code example

Example 1: how to check if window size of browser s changed javascript

$(window).resize(function() {
  console.log('window was resized');
});

Example 2: div resize event typescript

resizeObservable$: Observable<Event>
resizeSubscription$: Subscription

ngOnInit() {
    this.resizeObservable$ = fromEvent(window, 'resize')
    this.resizeSubscription$ = this.resizeObservable$.subscribe( evt => {
      console.log('event: ', evt)
    })
}