import { Observable } from 'rxjs';
import { RestrictArray } from './type';
export declare type InputFactory<State, Inputs = undefined> = Inputs extends undefined ? (state$: Observable<State>) => Observable<State> : (inputs$: Observable<RestrictArray<Inputs>>, state$: Observable<State>) => Observable<State>;
export declare function useObservable<State>(inputFactory: InputFactory<State>): State | null;
export declare function useObservable<State>(inputFactory: InputFactory<State>, initialState: State): State;
export declare function useObservable<State, Inputs>(inputFactory: InputFactory<State, Inputs>, initialState: State, inputs: RestrictArray<Inputs>): State;