Convert `exports defaults { someFunction }` to `export function someFunction {}`

convert_exports_default_object.js

#!/usr/bin/env node

// Convert a modules on the pattern
// export default {
//   fnAName: (bla) => {},
//   fnBName: (bla) => {},
// }
// to
// export const fnAName = (bla) =>
// export const fnBName = (bla) =>

// How to:
// convert_exports_default_object.js ./file/to/convert.js

const [ file, arg ] = process.argv.slice(2)
if (!file) throw new Error('no file path passed')
const path = require('node:path')
const filePath = path.resolve(process.cwd(), file)
const { readFileSync, writeFileSync } = require('node:fs')
const dry = arg === '--dry' || arg === '-d'

const text = readFileSync(filePath).toString()

const parse = text => {
  let inExportedObject = false
  const lines = text.split('\n')
  return lines
    .map((line, i) => {
      // console.log('line', i, line, '//' , { inExportedObject })
      if (line.startsWith('export default {')) {
        inExportedObject = true
        return
      }
      if (inExportedObject && line === '}') {
        inExportedObject = false
        return
      }

      if (!inExportedObject) return line


      // Drop end of multi-line function comma
      if (line === '  },') return '}'

      if (line.match(/^\s{2}(\w+):\s+/)) {
        return line
          .replace(/^\s{2}(\w+):\s+/, 'export const $1 = ')
          // Drop end of one-line function comma
          .replace(/,$/, '');
      }

      if (line.match(/^\s{2}(\w+),?$/)) {
        return line.replace(/^\s{2}(\w+),?/, 'export const $1 = $1 // FIX ME');
      }

      // Unindent other lines
      if (line.match(/^\s{2}/)) return line.replace(/^\s{2}/, '');

      return line
    })
    .filter(line => line != null)
    .join('\n');
}

if (text.includes('export default')) {
  if (dry) console.log(parse(text))
  else writeFileSync(filePath, parse(text))
} else {
  console.log(`doesn't contain export default: ${filePath}`)
}