import { DependencyList } from 'react';
import { observerFunction } from './observable';
/**
 * Create a memoized observable with a map implemented and a distinctUntilChanged,
 * the observable will be unsubscribe automatically if component unmount
 * @returns [observableValue, error, isCompleted]
 */
export declare function useMappedObservable<T, W>(observableGenerator: observerFunction<T>, mapperFunction: (data: T) => W, deps: DependencyList, defaultValue?: W | null): [W | null, any, boolean, undefined];