webpack.prod.config.js

const webpack = require('webpack');
const autoprefixer = require('autoprefixer');
const precss = require('precss');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const ExtractTextPlugin = require('extract-text-webpack-plugin');
const path = require('path');
const BUILD_DIR = path.resolve(__dirname, 'public');
const APP_DIR = path.resolve(__dirname, 'src');
const indexPath = path.join(__dirname, 'src', 'index.html');

module.exports = {
  devtool: 'source-map',
  entry: [
    'babel-polyfill',
    `${APP_DIR}/js/index.js`
  ],
  output: {
    path: BUILD_DIR,
    filename: 'bundle.js',
    publicPath: '/'
  },
  resolve: {
    extensions: ['', '.js', '.jsx', '.css', '.scss'],
    modulesDirectories: ['src', 'node_modules']
  },
  module: {
    loaders: [{
      test: /\.jsx?$/,
      exclude: /(node_modules)|(bower_components)/,
      loader: 'babel'
    }, {
      test: /\.s?css$/,
      loader: ExtractTextPlugin.extract('style', 'css?-autoprefixer!postcss!sass'),
      include: /(src)|(node_modules)/
    }]
  },
  postcss() {
    return [autoprefixer, precss];
  },
  plugins: [
    new HtmlWebpackPlugin({
      inject: true,
      template: indexPath,
      minify: {
        removeComments: true,
        collapseWhitespace: true,
        removeRedundantAttributes: true,
        useShortDoctype: true,
        removeEmptyAttributes: true,
        removeStyleLinkTypeAttributes: true,
        keepClosingSlash: true,
        minifyJS: true,
        minifyCSS: true,
        minifyURLs: true
      }
    }),
    new webpack.DefinePlugin({
      'process.env.NODE_ENV': JSON.stringify('production')
    }),
    new webpack.optimize.OccurrenceOrderPlugin(),
    new webpack.optimize.UglifyJsPlugin({
      compressor: {
        screw_ie8: true,
        warnings: false
      },
      minimize: true,
      compress: {
        screw_ie8: true,
        warnings: false
      },
      mangle: {
        screw_ie8: true
      },
      output: {
        comments: false,
        screw_ie8: true
      }
    }),
    new ExtractTextPlugin('style.css', { allChunks: true })
  ]
};