/// <reference types="node" />
import * as express from 'express';
import * as http from 'http';
import * as https from 'https';
declare type InternalService = http.Server | https.Server;
/**
 * @description
 *  Initialize an Henson service that is deployed on `internal-data-network`.
 *  Whether HTTP or HTTPS is applied depends on the parameter `palInternalServiceProtocol`.
 * @param {express.Express} app The `express` application instance
 * @returns {InternalService} The instance of the internal service
 * @throws
 *  - Exception thrown by `@anpingli/common`'s `config.get`.
 *  - Expection thrown by `fs.readFileSync`.
 */
declare function initInternalService(app: express.Express): InternalService;
declare function startInternalServiceWithHostname(app: express.Express, port: number, hostname: string, errorHandler: (error: Error) => void): InternalService;
/**
 * @description
 *  Initialize and start an Henson service that is deployed on `internal-data-network`.
 *  Whether HTTP or HTTPS is applied depends on the parameter `palInternalServiceProtocol`.
 * @param  {express.Express} app The `express` application instance
 * @param  {number} port The port for listening
 * @param  {(error:Error)=>void} errorHandler The callbck to handle 'error' events after listening
 * @returns {InternalService } The instance of the internal service
 * @throws
 *  - Exception thrown by `fs.readFileSync`
 *  - Exception thrown by `express`'s `Application.listen`
 */
declare function startInternalService(app: express.Express, port: number, errorHandler: (error: Error) => void): InternalService;
export { InternalService, initInternalService, startInternalService, startInternalServiceWithHostname, };