import { IScanFunction } from '../../../../../../observer/pipes/built-in/scan/scan-function.type';
import { IObservable } from '../../../../../type/observable.type';
/**
 * @see scanObserverPipe
 */
export declare function scanObservable<GIn, GOut>(subscribe: IObservable<GIn>, scanFunction: IScanFunction<GIn, GOut>, initialValue: GOut): IObservable<GOut>;