module.exports = function config(api) {
  const validEnv = ['development', 'test', 'production']
  const currentEnv = api.env()
  const isDevelopmentEnv = api.env('development')
  const isProductionEnv = api.env('production')
  const isTestEnv = api.env('test')

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

  return {
    presets: [
      isTestEnv && [
        '@babel/preset-env',
        {
          targets: { node: 'current' },
          modules: 'commonjs'
        }
      ],
      (isProductionEnv || isDevelopmentEnv) && [
        '@babel/preset-env',
        {
          useBuiltIns: 'entry',
          corejs: '3.8',
          modules: false,
          bugfixes: true,
          loose: true,
          exclude: ['transform-typeof-symbol']
        }
      ],
      [
        '@babel/preset-react',
        {
          development: isDevelopmentEnv || isTestEnv,
          useBuiltIns: true
        }
      ]
    ].filter(Boolean),
    plugins: [
      'babel-plugin-macros',
      [
        '@babel/plugin-proposal-class-properties',
        { loose: true }
      ],
      [
        '@babel/plugin-transform-runtime',
        {
          helpers: false,
          regenerator: true,
          corejs: false
        }
      ],
      isProductionEnv && [
        'babel-plugin-transform-react-remove-prop-types',
        { removeImport: true }
      ]
    ].filter(Boolean)
  }
}