import {Injectable} from '@angular/core'; import {ActivatedRouteSnapshot, Resolve, Router, RouterStateSnapshot} from '@angular/router'; import {User} from '../core/user'; import {Observable} from 'rxjs/internal/Observable'; import {UserService} from './user.service'; @Injectable({ providedIn: 'root' }) export class UserListResolver implements Resolve { constructor(private ser: UserService, private router: Router) { } resolve(route: ActivatedRouteSnapshot, state: RouterStateSnapshot): Observable { return this.ser.list(); } }