bun.config.js

import path from 'path'
import fs from 'fs'

const config = {
  sourcemap: 'external',
  entrypoints: ['app/javascript/application.ts'],
  outdir: path.join(process.cwd(), 'app/assets/builds'),
}

const build = async (config) => {
  const result = await Bun.build(config)

  if (!result.success) {
    if (process.argv.includes('--watch')) {
      console.error('Build failed')
      for (const message of result.logs) {
        console.error(message)
      }
      return
    } else {
      throw new AggregateError(result.logs, 'Build failed')
    }
  }
};

(async () => {
  await build(config)

  if (process.argv.includes('--watch')) {
    fs.watch(path.join(process.cwd(), 'app/javascript'), { recursive: true }, (eventType, filename) => {
      console.log(`File changed: ${filename}. Rebuilding...`)
      build(config)
    })
  } else {
    process.exit(0)
  }
})()