/**
 * @description StorageService 抽象类，只用来创建子类
 * */
declare abstract class StorageManager {
    storage: Storage;
    protected constructor(storage: 'localStorage' | 'sessionStorage');
    getItem(key: string): any;
    batchGetItem(keys: string[]): "" | Record<string, undefined>;
    setItem(key: string, value: any): void;
    batchSetItem(info: Record<string, unknown>): void;
    removeItem(key: string): void;
    batchRemoveItem(keys: string[]): void;
    clear(): void;
}
declare class LocalService extends StorageManager {
    static instance: LocalService;
    constructor();
    static getInstance(): LocalService;
}
declare class SessionService extends StorageManager {
    static instance: SessionService;
    constructor();
    static getInstance(): SessionService;
}
export declare const LocalStorage: LocalService;
export declare const SessionStorage: SessionService;
export {};