import { Observable } from 'rxjs';
import * as i0 from "@angular/core";
export declare class UserActivityService {
    trackActivity(collapseTimeInMs?: number): Observable<Event>;
    static ɵfac: i0.ɵɵFactoryDeclaration<UserActivityService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<UserActivityService>;
}