我正在使用express并通过npm包"mongodb":"^3.0.10"连接到mongodb。我的app.ts看起来像这样:constapp=express();letserver:http.Server;(async()=>{app.use(bodyParser.json());letdb:Db;try{consthost=config.get("api.dbConfig.host");console.log(host);constdbName=config.get("api.dbConfig.dbName");constport=config.get("api.dbConfig