import { Reducer, Dispatch } from 'react';
import { Option, Facet, EqualityCheck } from '../types';
/**
 * Provides a parallel to React's useReducer, but instead returns a facet as the value
 *
 * @param reducer function that will take the previous state and an action to return a new state
 * @param initialState mandatory initial state for the reducer's facet
 * @param equalityCheck optional equality check (has a default checker)
 * @returns
 */
export declare const useFacetReducer: <S, A = string>(reducer: Reducer<Option<S>, A>, initialState: S, equalityCheck?: EqualityCheck<S>) => [Facet<S>, Dispatch<A>];