Angular 2 Analytics via Routing

app.component.ts

  //...
  import {ROUTER_DIRECTIVES, Router, Event, NavigationEnd} from '@angular/router';
  import {environment} from './environment';
  //...
  
  declare var ga : any;
  
  //..
  
  constructor(private router: Router ) {
    if (environment.production) {
      router.events.subscribe(
        (event: Event) => {
          if (event instanceof NavigationEnd) {
            ga('send', 'pageview', event.urlAfterRedirects);
          }
        }
      );
    }
  }
  
  //..