import { Storage, StorageElement } from "./interface";
/**
 * The memory storage implementation.
 * @category Utilities
 */
export declare class MemStorage implements Storage {
    private readonly mem;
    get(key: string): Promise<StorageElement>;
    set(key: string, value: StorageElement): Promise<void>;
    delete(key: string): Promise<void>;
    listKeys(): Promise<string[]>;
    listMetadata(): Promise<StorageElement[]>;
}