A quick api boilerplate file for express with hot-reloading and typescript support

api.ts

#!/usr/bin/env node

/* The API routes and middlewares */
const server = () => import('express').then(({ default: express }) => {
  const app = express()
  app.get('/hello', (req, res) => {
    res.json({ message: 'Hey there!' })
  })
  return app
})

/* The dev startup script with hot-reload */
const dev = () => import('nodemon').then(({ default: nodemon }) => {
  nodemon({ script: __filename, ext: 'ts' }).on('restart', (files) => console.log('App restarted due to:', files))
})

/* The standard server start script */
const start = () => {
  const port = process.env.PORT || 3000
  server().then(app => app.listen(port, () => console.log(`Server listening at http://localhost:${port}`)))
}

/* A cli for starting the API server */
const cli = () => {
  const args = process.argv.slice(2)
  const command = args.shift()
  if (command === 'dev') dev()
  else start()
}

/* Can be imported as a module, or started as a CLI */
if (require.main === module) cli()