authentication.guard.ts

import { Injectable } from '@angular/core';
import { CanActivate, ActivatedRouteSnapshot, RouterStateSnapshot, UrlTree } from '@angular/router';
import { Observable } from 'rxjs';
import { AuthGuardService } from './auth-guard.service';

@Injectable({
  providedIn: 'root'
})
export class AuthenticationGuard implements CanActivate {
  constructor(private authService: AuthGuardService) { }
  canActivate(
    next: ActivatedRouteSnapshot,
    state: RouterStateSnapshot): Observable<boolean | UrlTree> | Promise<boolean | UrlTree> | boolean | UrlTree {
    return this.authService.getToken();
  }

}