export type DraftFunction<S> = (draft: S) => void;
export type Updater<S> = (arg: S | DraftFunction<S>) => void;
export type ImmerHook<S> = [S, Updater<S>];
export declare function useImmer<S>(): ImmerHook<S | undefined>;
export declare function useImmer<S = any>(initialValue: S | (() => S)): ImmerHook<S>;