/// <reference types="node" />
import { Middleware } from './middleware';
import { Request, Response } from '../http';
/**
 * Logs requests and responses as JSON.
 *
 * @export
 * @class JSONLogger
 * @extends {Middleware}
 */
export declare class JSONLogger extends Middleware {
    /**
     * Reference to underlying bunyan logger.
     *
     * @private
     * @type {bunyan}
     * @memberof JSONLogger
     */
    private log;
    /**
     * Reference to underlying log level.
     *
     * @private
     * @type {string}
     * @memberof JSONLogger
     */
    private level;
    /**
     * Creates an instance of JSONLogger.
     * @param {string} name
     * @param {string} [level='info']
     * @memberof JSONLogger
     */
    constructor(name: string, level?: string);
    /**
     * Add a NodeJS.WriteStream stream to the list of log targets.
     *
     * @param {NodeJS.WriteStream} stream
     * @memberof JSONLogger
     */
    addStream(stream: NodeJS.WriteStream): void;
    /**
     * Logs selected request values as JSON.
     *
     * @param {Request} req
     * @param {Response} res
     * @memberof JSONLogger
     */
    processRequest: (req: Request, res: Response) => Promise<void>;
    /**
     * Logs selected response values as JSON.
     *
     * @param {Request} req
     * @param {Response} res
     * @returns {Promise<any>}
     * @memberof JSONLogger
     */
    processResponse: (req: Request, res: Response) => Promise<void>;
}