export declare namespace StorageUtils {
    function getJSONItem<T = any>(key: string, defaultData?: T): T;
    function getItem(key: string): string;
    function setItem(key: string, data: string): void;
    function setJSONItem<T = any>(key: string, data: T): void;
    function removeItem<T = any>(key: string, data: T): void;
}