title: Can't put a breakpoint in Angular constructor or OnInit
body: <p>I have an Angular application, and I am trying to set a breakpoint in <kbd>F12</kbd> tools in Chrome or IE. I have simple test case:</p>
  
  <pre><code>export class LoginComponent implements OnInit {
      message: string;
  
      constructor(private router: Router) { 
          console.log("Login Constructor");
      }
  
      ngOnInit() {
          console.log("Login OnInit");
      }
  }
  </code></pre>
  
  <p>I see log output in the console, but setting a breakpoint doesn't work. I think it stopped working a few days ago (not sure if it was an upgrade of some library, or Windows, or both browsers). Don't even know where to start looking. The project is built with webpack, and I am getting to this component via routing:</p>
  
  <pre><code>const appRoutes: Routes = [
  {
      path: '',
      redirectTo: '/login',
      pathMatch: 'full'
  },
  {
      path: '/login',
      component: LoginComponent
  }
  ...
  ]
  </code></pre>
  
  <p>Note, that button click handler breaks as expected.</p>