module.exports = { presets: [ [ '@babel/preset-env', { modules: false, loose: true } ], '@babel/preset-react' ], plugins: [ ['@babel/plugin-proposal-class-properties', { loose: true }], '@babel/plugin-proposal-export-default-from', '@babel/plugin-proposal-export-namespace-from', '@babel/plugin-syntax-dynamic-import', 'react-hot-loader/babel' ], env: { test: { plugins: ['@babel/plugin-transform-modules-commonjs'] }, production: { plugins: [ '@babel/plugin-transform-react-inline-elements', '@babel/plugin-transform-react-constant-elements' ] } } };