babel.config.js

module.exports = function(api) {
  const defaultConfigFunc = require('shakapacker/package/babel/preset.js')
  const resultConfig = defaultConfigFunc(api)
  var validEnv = ['development', 'test', 'production']
  var currentEnv = api.env()
  var isDevelopmentEnv = api.env('development')
  var isProductionEnv = api.env('production')
  var isTestEnv = api.env('test')

  if (!validEnv.includes(currentEnv)) {
    throw new Error(
      'Please specify a valid `NODE_ENV` or ' +
        '`BABEL_ENV` environment variables. Valid values are "development", ' +
        '"test", and "production". Instead, received: ' +
        JSON.stringify(currentEnv) +
        '.'
    )
  }

  const changesOnDefault = {
    presets: [
      [
        '@babel/preset-react',
        {
          development: isDevelopmentEnv || isTestEnv,
          useBuiltIns: true
        } 
      ]
    ].filter(Boolean),
    plugins: [
      isProductionEnv && ['babel-plugin-transform-react-remove-prop-types', 
        { 
          removeImport: true 
        }
      ],
      process.env.WEBPACK_SERVE && 'react-refresh/babel'
    ].filter(Boolean),
  }

  resultConfig.presets = [...resultConfig.presets, ...changesOnDefault.presets]
  resultConfig.plugins = [...resultConfig.plugins, ...changesOnDefault.plugins ]

  return resultConfig
}