问Next.js:没有自定义服务器或包装器的中间件

EN

const express = require("express");
const app = express();

// I call the functions in each modules to use the different middlewares
require("./startup/cors")(app);
require("./startup/routes")(app);
require("./startup/db")();

const port = process.env.PORT || config.get("port");
const server = app.listen(port, () =>
  winston.info(`Listening on port ${port}...`)
);

module.exports = server;

const cors = require("cors");

module.exports = function(app) {
  app.use(cors());
};