import { Reducer, Action } from 'redux';
export declare type IndexedState<State> = {
    [K in string]?: State;
};
declare type IndexedReducer<State> = Reducer<IndexedState<State>>;
/**
 * A utility to make a reducer collection-oriented. I.e., the resulting state
 * is indexed by some identifier derived from an `Action`. This utility reduces
 * boilerplate and manages immutable updates to the state.
 *
 * Enhances a reducer by returning a parent state object that is keyed by an
 * index value. Actions are delegated to the provided reducer, using the return
 * value of `getIndexValue(action)` as the index value. If
 * `getIndexValue(action)` returns `undefined`, the reducer will be called with
 * it and all substates.
 */
export declare function indexByActionProperty<State>(reducer: Reducer<State>, getIndexValue: (action: Action) => string | undefined): IndexedReducer<State>;
export {};
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