ng-router-state#read-from-events.ts

@Component({
  selector: 'app-root',
  template: `<pre>{{ state$ | async | json }}</pre>`,
})
export class AppComponent implements OnInit {
  private state$: Observable<object>;
  
  constructor(public router: Router) { }
  
  ngOnInit() {
    this.state$ =  this.router.events.pipe(
      filter(e => e instanceof NavigationStart),
      map(() => this.router.getCurrentNavigation().extras.state)
    )
  }
}