declare class MemoryDB {
    listHistory: any[];
    /**
     *
     * @param from
     * @returns
     */
    getPrevByNumber(from: string): Promise<any>;
    /**
     *
     * @param ctx
     */
    save(ctx: any): Promise<void>;
}
export { MemoryDB };
//# sourceMappingURL=index.d.ts.map