import { Dispatch } from 'react';
import { SetStateAction } from 'react';

declare type Option_2<T> = T | undefined;

export declare type PersistableValue = string | number | boolean | null | PersistableValue[] | {
    [key: string]: PersistableValue;
};

/* Excluded from this release type: useHistoryFrameId */

/**
 * Returns a stateful value and a function to update it. The value is persisted in app history
 * and restored when (and if) the page will be returned to.
 *
 * @param key Unique identifier of this state within a widget,
 * @param initialValue The initial value to use if a persistent state hasn't been initialized before and
 * hasn't been restored from app history. Or a factory of such values.
 *
 * @remark Only json-serializable values can be used as persistent state.
 * @remark {@code undefined} value is not restored from history.
 *
 * @beta
 */
export declare function usePersistentState<T extends Option_2<PersistableValue>>(key: string, initialValue: T | (() => T)): [T, Dispatch<SetStateAction<T>>];

export { }