title: Handling element resize event in Angular 2 (non-polling)
body: <p>Could you please suggest a way or point to a directive that fires an event on size updates of a HTML element in Angular 2? </p>
  
  <p>The following approach</p>
  
  <pre><code>@HostListener('window:resize') onResize() 
  </code></pre>
  
  <p>fires only when the browser window or frame resizes, while I need instead to catch a div resizing. </p>
  
  <p>I am looking for a non-polling based solution. 
  Thank you in advance.</p>