import type { Action, Reducer } from './actions';
/**
 * Like redux's combineReducers, but allows passing only a partial reducer mapping
 * redux's combineReducers output state must be exactly the mapping passed as parameter,
 * which doesn't allow to only provide a partial set of reducers and passthrough the other state's
 * keys. This function allows that, also preserving state/object reference when reducers don't
 * change state value.
 *
 * @param reducers - A mapping of a subset of state's key to nested reducers functions
 * @param initialState - global initial state, required when initializing first object with partial
 *                      reducers
 * @returns Full reducer for state S and actions A
 */
export declare function partialCombineReducers<S, A extends Action = Action>(reducers: {
    [K in keyof S]?: Reducer<S[K], A>;
}, initialState: S): Reducer<S, A>;