node.js使用winston + mongoDB

nodeJS: v14.17.0
express-async-errors: "3.1.1",
mongoose: "5.13.7",
winston: "3.3.3",
winston-mongodb: "5.0.7"
config: "3.3.6"

代码:

const winston = require("winston");
const config = require("config");
require("winston-mongodb");
require("express-async-errors");

module.exports = function () {
  db = config.get("db");

  winston.exceptions.handle(
    new winston.transports.Console({ colorize: true, prettyPrint: true }),
    new winston.transports.File({ filename: "logs/uncaughtExceptions.log" })
  );

  process.on("unhandledRejection", (ex) => {
    throw ex;
  });

  winston.add(new winston.transports.File({ filename: "logs/logfile.log" }));

  winston.add(
    new winston.transports.MongoDB({
      db: db,
      options: {
        useUnifiedTopology: true,
      },
    })
  );
};