module.exports = merge(baseWebpackConfig, { 
 module: {
 rules: utils.styleLoaders({ sourceMap: config.dev.cssSourceMap })
 },
 // cheap-module-eval-source-map is faster for development
 devtool: 'source-map',
 plugins: [
 new webpack.DefinePlugin({
  'process.env': config.dev.env
 }),
 // https://github.com/glenjamin/webpack-hot-middleware#installation--usage
 new webpack.HotModuleReplacementPlugin(),
 new webpack.NoEmitOnErrorsPlugin(),
 // https://github.com/ampedandwired/html-webpack-plugin
 new HtmlWebpackPlugin({
  filename: 'index.html',
  template: 'index.html',
  inject: true
 }),
 new FriendlyErrorsPlugin()
 ]
})