angular resize detection not running code example

Example 1: typescript on window resize

@HostListener('window:resize', ['$event'])
onResize(event) {
  event.target.innerWidth;
}

Example 2: how to run resize event only on client side angular

@HostListener('window:resize', ['$event'])
onResize(event) {
  if(window){
      let a=window.innerWidth;
  }
}