import { CanDeactivate, ActivatedRouteSnapshot, RouterStateSnapshot } from '@angular/router';
import { MainPageComponent } from './main-page.component';
import { Observable } from 'rxjs/Observable';
export declare class MainPageSaveGuard implements CanDeactivate<MainPageComponent> {
    constructor();
    canDeactivate(component: MainPageComponent, currentRoute: ActivatedRouteSnapshot, currentState: RouterStateSnapshot, nextState: RouterStateSnapshot): Observable<boolean> | Promise<boolean> | boolean;
}