Angular 2 router event not firing first time?

As I see all these solutions relay to route.snapshot and try to combine NavigationEnd action with it. But if you try to access the page – it is not fired with the first NavigationEnd by router.events. Also snapshot fires parent route, not a child route. so first you could use child route, but it will be also not fired as first…

this.router.events.pipe(
  filter((event) => event instanceof NavigationEnd),
  map(() => this.aRoute.snapshot),
  map((route) => {
    while (route.firstChild) {
      route = route.firstChild;
    }
    return route;
  })
)

so BEST solution for me with first fire on proper current route is using router.events + router.url with one type NavigationEnd:

 this.router.events
   .pipe(
      filter((event) => event instanceof NavigationEnd),
      startWith(this.router)
   )
   .subscribe((event: NavigationEnd) => {
     // there will be first router.url - and next - router events
 })