import { Observable } from 'rxjs';
import { KngxNavbarLayer } from '../interfaces/navbar-layer';
export type LatestPropResult<T extends KngxNavbarLayer, U extends keyof T> = Observable<{
    id: number;
    value: T[U];
} | null>;
export declare function latestProp<T extends KngxNavbarLayer, U extends keyof T>(prop: U): (source: Observable<T[]>) => LatestPropResult<T, U>;