import { CanDeactivate, ActivatedRouteSnapshot, RouterStateSnapshot, UrlTree } from '@angular/router';
import { Observable } from 'rxjs';
import { IRouterDeactivatable } from './IRouterDeactivatable';
export declare class CanDeactivateGuard<T extends IRouterDeactivatable> implements CanDeactivate<T> {
    canDeactivate(component: IRouterDeactivatable, currentRoute: ActivatedRouteSnapshot, currentState: RouterStateSnapshot, nextState?: RouterStateSnapshot): Observable<boolean | UrlTree> | Promise<boolean | UrlTree> | boolean | UrlTree;
}