title: Similar to window.angular in angular2
body: <p>I am testing an application in browser and I need to check if the website is using <code>jquery</code> or <code>angularJs</code> or <code>angular</code></p>
  
  <p>For <code>jQuery</code> I can check for <code>$</code> function and for <code>angularJs</code> I can check for <code>window.angular</code> function. But is there anything similar for <code>angular 2/4/5</code> to check if its a <code>angular</code> application in browser?</p>