webpack, webpack-cli, webpack-dev-server
react, react-dom
babel-loader, babel-preset-react-app,
process.env.BABEL_ENV = 'development'; // important here, or it will emit errors
{
test: /\.(js|jsx)$/i,
loader: 'babel-loader',
exclude: /node_modules/,
options: {
presets: [
['babel-preset-react-app']
]
}
}