import { Dispatch, SetStateAction } from 'react';
/**
 * Hook to use a state that is persisted in local storage.
 *
 * The initial value is loaded from local storage if the key is defined.
 * If the key is undefined, the local storage is not used, and the initial value is undefined.
 *
 * If the key changes, the value is updated from local storage. If the new key is undefined, the value does not change.
 *
 * Note that the values stored with a previous key are maintained.
 * TODO(SL): add a way to delete them?
 *
 * Contrarily to useState, the initial value is always undefined.
 *
 * @param options
 * @param [string | undefined] options.key The key to use in local storage. If undefined, the value is not persisted.
 *
 * @returns [T | undefined, Dispatch<SetStateAction<T | undefined>>] The value and the setter.
 */
export declare function useLocalStorageState<T>({ key }?: {
    key?: string;
}): [T | undefined, Dispatch<SetStateAction<T | undefined>>];