Angular Firebase Router Guard with Browser Refresh

auth.guard.ts

import { Injectable } from '@angular/core';
import { CanActivate, ActivatedRouteSnapshot, RouterStateSnapshot, Router } from '@angular/router';
import { Observable } from 'rxjs/Observable';
import { AngularFireAuth } from 'angularfire2/auth';
import 'rxjs/add/operator/do';
import 'rxjs/add/operator/map';
import 'rxjs/add/operator/take';

@Injectable()
export class AuthGuard implements CanActivate {
  constructor(private afAuth: AngularFireAuth, private router: Router) {}


  canActivate(
    next: ActivatedRouteSnapshot,
    state: RouterStateSnapshot): Observable<boolean> {

      return this.afAuth.authState
       .take(1)
       .map(user => !!user)
       .do(loggedIn => {
         if (!loggedIn) {
           console.log("access denied")
           this.router.navigate(['/login']);
         }
     })
   }

}

error TS2339: Property 'take' does not exist on type 'Observable'

error TS2339: Property 'take' does not exist on type 'Observable'

import { take, map, tap } from 'rxjs/operators';

And use this updated code:

  canActivate(): Observable<boolean> {
    return this.afAuth.authState.pipe(
      take(1),
      map(user => !!user),
      tap(loggedIn => {
        if (!loggedIn) {
          console.log('Access Denied');
          this.router.navigate(['/login']);
        }
      })
    );
  }

10x men <3

error TS2339: la propiedad 'toma' no existe en el tipo 'Observable'

importar {tomar, mapa, tocar} de 'rxjs / operadores';

Y usa este código actualizado:

  canActivate(): Observable<boolean> {
    return this.afAuth.authState.pipe(
      take(1),
      map(user => !!user),
      tap(loggedIn => {
        if (!loggedIn) {
          console.log('Access Denied');
          this.router.navigate(['/login']);
        }
      })
    );
  }

It works thank you.