import React from "react";
export declare function useAsyncState<S = undefined>(): [
    S | undefined,
    (newState: React.SetStateAction<S | undefined>) => Promise<S | undefined>
];
/**
 * Returns a stateful value, and a async function to update it.
 * @param initialState initial stat
 * @returns Current state and update action
 */
export declare function useAsyncState<S>(initialState: S | (() => S)): [S, (newState: React.SetStateAction<S>) => Promise<S>];