const babel = require('@babel/core')
const { readFileSync, writeFileSync } = require('fs')

const code = readFileSync('src/index.js')
// src/index.js:
// const foo = 'test'
// console.log((foo ?? '') == '')

const babelConfig = {
  plugins: [
    '@babel/plugin-proposal-nullish-coalescing-operator',
  ],
}

// this works as expected
const ast = babel.parseSync(code, babelConfig)

// this removes the parentheses
const { code: transformedCode } = babel.transformFromAstSync(ast, code)

writeFileSync('dist/index.js', transformedCode)
// dist/index.js:
// const foo = 'test';
// console.log(foo ?? '' == '');

const babelRegister = require('@babel/register')
babelRegister(babelConfig)

require('./dist')
// outputs 'test' instead of false