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Sample webpack.config.js for creating react production bundles
var webpack = require('webpack');
var CleanWebpackPlugin = require('clean-webpack-plugin');
module.exports = {
// Don't attempt to continue if there are any errors.
bail: true,
// We generate sourcemaps in production. This is slow but gives good results.
// You can exclude the *.map files from the build during deployment.
devtool: 'hidden-source-map',
entry: [
module: {
loaders: [
test: /\.css$/,
exclude: /node_modules/,
loader: 'style-loader!css-loader'
test: /\.(js|jsx)$/,
exclude: /node_modules/,
loader: 'babel-loader',
options: {
compact: true,
plugins: [
// Delete the dist folder
new CleanWebpackPlugin(['dist']),
// Don't emit code if there were any errors
new webpack.NoEmitOnErrorsPlugin(),
// Makes some environment variables available to the JS code, for example:
// if (process.env.NODE_ENV === 'production') { ... }. See `./env.js`.
// It is absolutely essential that NODE_ENV was set to production here.
// Otherwise React will be compiled in the very slow development mode.
new webpack.DefinePlugin({
'process.env': {
'NODE_ENV': JSON.stringify('production')
// Minify the code.
new webpack.optimize.UglifyJsPlugin({
compress: {
warnings: false,
// Disabled because of an issue with Uglify breaking seemingly valid code:
// Pending further investigation:
comparisons: false,
output: {
comments: false,
// Turned on because emoji and regex is not minified properly using default
ascii_only: true,
sourceMap: true,
// skip pre-minified libs
exclude: [/\.min\.js$/gi],
// Moment.js is an extremely popular library that bundles large locale files
// by default due to how Webpack interprets its code. This is a practical
// solution that requires the user to opt into importing specific locales.
new webpack.IgnorePlugin(/^\.\/locale$/, /moment$/),
resolve: {
extensions: ['*', '.js', '.jsx']
output: {
path: __dirname + '/dist',
publicPath: '/',
filename: process.env.npm_package_name + '-bundle.js'
// Some libraries import Node modules but don't use them in the browser.
// Tell Webpack to provide empty mocks for them so importing them works.
node: {
dgram: 'empty',
fs: 'empty',
net: 'empty',
tls: 'empty',
child_process: 'empty',
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