/**
 * This plugin adds the property response_to_mid to all events
 */
export class ProtocolEnrichmentPlugin {
    /**
     * @param {Request} req
     * @param {Responder} res
     */
    beforeProcessMessage(req: Request, res: Responder): boolean;
    /**
     * @param {Responder} res
     * @returns {void}
     */
    _modifyResponderSend(res: Responder): void;
}