rsnext/packages/next/cli/next-start.ts

#!/usr/bin/env node

import { resolve } from 'path'
import arg from 'next/dist/compiled/arg/index.js'
import startServer from '../server/lib/start-server'
import { cliCommand } from '../bin/next'

const nextStart: cliCommand = argv => {
  const args = arg(
    {
      // Types
      '--help': Boolean,
      '--port': Number,
      '--hostname': String,

      // Aliases
      '-h': '--help',
      '-p': '--port',
      '-H': '--hostname',
    },
    { argv }
  )

  if (args['--help']) {
    // tslint:disable-next-line
    console.log(`
      Description
        Starts the application in production mode.
        The application should be compiled with \`next build\` first.

      Usage
        $ next start <dir> -p <port>

      <dir> is the directory that contains the compiled dist folder
      created by running \`next build\`.
      If no directory is provided, the current directory will be assumed.
      You can set a custom dist folder in config https://github.com/zeit/next.js#custom-configuration

      Options
        --port, -p      A port number on which to start the application
        --hostname, -H  Hostname on which to start the application
        --help, -h      Displays this message
    `)
    process.exit(0)
  }

  const dir = resolve(args._[0] || '.')
  const port = args['--port'] || 3000
  startServer({ dir }, port, args['--hostname'])
    .then(async app => {
      // tslint:disable-next-line
      console.log(
        `> Ready on http://${args['--hostname'] || 'localhost'}:${port}`
      )
      await app.prepare()
    })
    .catch(err => {
      // tslint:disable-next-line
      console.error(err)
      process.exit(1)
    })
}

export { nextStart }