import State from "./index";
import { StorageKey } from "../storage";
/**
 * Will persist the 'state' into the configured storage with the key or if no key passed the state key
 */
export declare function persistValue(state: State, key?: StorageKey): Promise<void>;
/**
 * Save current _value into storage if isPersistState
 */
export declare function updateValue(state: State): void;