babel.config.js

module.exports = function(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) +
        '.'
    )
  }

  return {
    presets: [
      isTestEnv && [
        '@babel/preset-env',
        {
          targets: {
            node: 'current',
          },
          modules: 'commonjs',
        },
        '@babel/preset-react',
      ],
      (isProductionEnv || isDevelopmentEnv) && [
        '@babel/preset-env',
        {
          forceAllTransforms: true,
          useBuiltIns: 'entry',
          corejs: 3,
          modules: false,
          exclude: ['transform-typeof-symbol'],
        },
      ],
      [
        '@babel/preset-react',
        {
          development: isDevelopmentEnv || isTestEnv,
          useBuiltIns: true,
        },
      ],
      ['@babel/preset-typescript', { 'allExtensions': true, 'isTSX': true }],
    ].filter(Boolean),
    plugins: [
      'babel-plugin-macros',
      '@babel/plugin-syntax-dynamic-import',
      isTestEnv && 'babel-plugin-dynamic-import-node',
      '@babel/plugin-transform-destructuring',
      ["@babel/plugin-proposal-decorators", { legacy: true }],
      [
        '@babel/plugin-proposal-object-rest-spread',
        {
          useBuiltIns: true,
        },
      ],
      ["@babel/plugin-proposal-class-properties"],
      [
        '@babel/plugin-transform-runtime',
        {
          helpers: false,
          regenerator: true,
          corejs: false,
        },
      ],
      [
        '@babel/plugin-transform-regenerator',
        {
          async: false,
        },
      ],
      isProductionEnv && [
        'babel-plugin-transform-react-remove-prop-types',
        {
          removeImport: true,
        },
      ],
      // isProductionEnv && [
      //   'babel-plugin-transform-imports',
      //   {
      //     '@material-ui/core': {
      //       'transform': '@material-ui/core/esm/${member}',
      //       'preventFullImport': true
      //     },
      //     '@material-ui/icons': {
      //       'transform': '@material-ui/icons/esm/${member}',
      //       'preventFullImport': true
      //     },
      //     "lodash": {
      //       "transform": "lodash/${member}",
      //       "preventFullImport": true
      //     }
      //   }
      // ]
    ].filter(Boolean),
  }
}