rsnext/test/integration/non-standard-node-env-warning/server.js

const http = require('http')
const next = require('next')

const dev = process.env.NODE_ENV !== 'production'
const dir = __dirname
const port = process.env.PORT || 3000

const app = next({ dev, dir })
const handleNextRequests = app.getRequestHandler()

app.prepare().then(() => {
  const server = new http.Server(async (req, res) => {
    handleNextRequests(req, res)
  })

  server.listen(port, (err) => {
    if (err) {
      throw err
    }

    console.log(`> Ready on http://localhost:${port}`)
  })
})