text: const express = require('express')
  const next = require('next')
  
  const port = parseInt(process.env.PORT, 10) || 3000
  const dev = process.env.NODE_ENV !== 'production'
  const app = next({ dev })
  const handle = app.getRequestHandler()
  
  app.prepare().then(() => {
    const server = express()
  
    server.get('/service-worker.js', (req, res) => {
      app.serveStatic(req, res, './.next/service-worker.js')
    })
  
    const serviceWorkers = [
      {
        filename: 'service-worker.js',
        path: './.next/service-worker.js',
      },
      {
        filename: 'firebase-messaging-sw.js',
        path: './static/firebase-messaging-sw.js',
      },
    ]
  
    serviceWorkers.forEach(({ filename, path }) => {
      server.get(`/${filename}`, (req, res) => {
        app.serveStatic(req, res, path)
      })
    })
  
    server.get('*', (req, res) => {
      return handle(req, res)
    })
  
    server.listen(port, err => {
      if (err) throw err
      console.log(`> Ready on http://localhost:${port}`)
    })
  })
  