export declare class SessionStorageService {
    constructor();
    /**
    * @param Object {key:value}
    * @return Callback Function
    */
    set(obj: any): Promise<boolean>;
    /**
    * @param Object {key:{object}}
    * @return Callback Function
    */
    setObject(obj: any): Promise<boolean>;
    get(key: string): Promise<string>;
    getObject(key: string): Promise<any>;
}