/** In memory storage.
 * This in memory storage implements the methods of localForage.
 */
export declare class Storage {
    storage: {
        [key: string]: any;
    };
    constructor();
    getItem: <T>(key: string) => Promise<T | null>;
    setItem: <T>(key: string, val: T) => Promise<T>;
    removeItem: (key: string) => Promise<void>;
    clear: () => Promise<void>;
}