webpack.config.prod.js

var webpack = require('webpack');
var path = require('path');
var ExtractTextPlugin = require('extract-text-webpack-plugin');

var BUILD_DIR = path.resolve(__dirname, 'dist');
var APP_DIR = path.resolve(__dirname, 'src');

module.exports = {
    devtool: 'source-map',
    entry: {
        app: './src/app/index.js'
    },
    output: {
        filename: '[name].min.js',
        path: BUILD_DIR,
        publicPath: ''
    },
    plugins: [
        new webpack.optimize.OccurenceOrderPlugin(),
        new webpack.NoErrorsPlugin(),
        new webpack.DefinePlugin({
            'process.env': {
                'NODE_ENV': JSON.stringify('production')
            }
        }),
        new webpack.optimize.UglifyJsPlugin({
            compressor: {
                warnings: false
            }
        }),
        new ExtractTextPlugin('app.css', {allChunks: true}),
    ],
    module: {
        loaders: [
            {
                test: /\.js$/,
                loaders: ['react-hot', 'babel'],
                exclude: /node_modules/,
                include: APP_DIR
            },
            {
                test: /\.css$/,
                loader: ExtractTextPlugin.extract('style-loader', 'css-loader!cssnext-loader')
            }]

    },
    cssnext: {
        browsers: 'last 2 versions'
    }
};