import { ActivatedRouteSnapshot, CanActivate, Router, RouterStateSnapshot, UrlTree } from '@angular/router';
import { Observable } from 'rxjs';
import { UserService } from '../services/user.service';
import * as i0 from "@angular/core";
export declare class AuthenticationGuard implements CanActivate {
    private readonly userDatabase;
    private readonly router;
    constructor(userDatabase: UserService, router: Router);
    canActivate(next: ActivatedRouteSnapshot, state: RouterStateSnapshot): Observable<boolean | UrlTree> | Promise<boolean | UrlTree> | boolean | UrlTree;
    static ɵfac: i0.ɵɵFactoryDeclaration<AuthenticationGuard, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<AuthenticationGuard>;
}