Angular2 Breadcrumb

constructor(
    private router: Router,
    private activatedRoute: ActivatedRoute,
    private titleService: Title
  ) {}

  ngOnInit(): void {
    this.router.events
      .filter(event => event instanceof NavigationEnd)
      .map(() => this.activatedRoute)
      .map(route => {
        while (route.firstChild) {
          route = route.firstChild;
        }
        return route;
      })
      .filter(route => route.outlet === 'primary')
      .mergeMap(route => route.data)
      .subscribe((event) => {
        this.titleService.setTitle(event['title']);
        this.pageInfo = event;
      });
  }