webpack.config.prod.js

// For info about this file refer to webpack and webpack-hot-middleware documentation
// For info on how we're generating bundles with hashed filenames for cache busting: https://medium.com/@okonetchnikov/long-term-caching-of-static-assets-with-webpack-1ecb139adb95#.w99i89nsz
import webpack from 'webpack';
import path from 'path';
import ExtractTextPlugin from 'extract-text-webpack-plugin';
import WebpackMd5Hash from 'webpack-md5-hash';
import HtmlWebpackPlugin from 'html-webpack-plugin';

const GLOBALS = {
  'process.env.NODE_ENV': JSON.stringify('production'),
  __DEV__: false
};

export default {
  debug: true,
  devtool: 'source-map', // more info:https://webpack.github.io/docs/build-performance.html#sourcemaps and https://webpack.github.io/docs/configuration.html#devtool
  noInfo: true, // set to false to see a list of every file being bundled.
  entry: {
    app: './src/index',
    vendor: ['react', 'redux', 'redux-thunk', 'react-redux', 'react-router', 'react-router-redux', 'react-infinite', 'axios', 'firebase']
  },
  target: 'web', // necessary per https://webpack.github.io/docs/testing.html#compile-and-test
  output: {
    path: `${__dirname}/dist`,
    publicPath: '/',
    filename: '[name].[chunkhash].js'
  },
  plugins: [
    // Hash the files using MD5 so that their names change when the content changes.
    new WebpackMd5Hash(),

    // Optimize the order that items are bundled. This assures the hash is deterministic.
    new webpack.optimize.OccurenceOrderPlugin(),

    // Tells React to build in prod mode. https://facebook.github.io/react/downloads.html
    new webpack.DefinePlugin(GLOBALS),

    // Generate an external css file with a hash in the filename
    new ExtractTextPlugin('[name].[contenthash].css'),

    // Generate HTML file that contains references to generated bundles. See here for how this works: https://github.com/ampedandwired/html-webpack-plugin#basic-usage
    new HtmlWebpackPlugin({
      template: 'src/index.ejs',
      minify: {
        removeComments: true,
        collapseWhitespace: true,
        removeRedundantAttributes: true,
        useShortDoctype: true,
        removeEmptyAttributes: true,
        removeStyleLinkTypeAttributes: true,
        keepClosingSlash: true,
        minifyJS: true,
        minifyCSS: true,
        minifyURLs: true
      },
      inject: true,
      // Note that you can add custom options here if you need to handle other custom logic in index.html
      // To track JavaScript errors via TrackJS, sign up for a free trial at TrackJS.com and enter your token below.
      trackJSToken: ''
    }),

    // Eliminate duplicate packages when generating bundle
    new webpack.optimize.DedupePlugin(),

    new webpack.optimize.CommonsChunkPlugin(/* chunkName= */"vendor", /* filename= */"vendor.bundle.js"),

    // Minify JS
    new webpack.optimize.UglifyJsPlugin({
      compress: {
        warnings: false,
        properties: true,
        sequences: true,
        dead_code: true,
        conditionals: true,
        comparisons: true,
        evaluate: true,
        booleans: true,
        unused: true,
        loops: true,
        hoist_funs: true,
        cascade: true,
        if_return: true,
        join_vars: true,
        drop_debugger: true,
        unsafe: true,
        hoist_vars: true,
        negate_iife: true
      },
      mangle: {
        toplevel: true,
        sort: true,
        eval: true,
        properties: true
      },
      output: {
        space_colon: false,
        comments: function(node, comment) {
          const text = comment.value;
          const type = comment.type;
          if (type == "comment2") {
            // multiline comment
            return /@copyright/i.test(text);
          }
        }
      }
    })
  ],
  module: {
    loaders: [
      {test: /\.js$/, include: path.join(__dirname, 'src'), loaders: ['babel']},
      {test: /\.eot(\?v=\d+.\d+.\d+)?$/, loader: 'file'},
      {test: /\.(woff|woff2)$/, loader: 'file-loader?prefix=font/&limit=5000'},
      {test: /\.ttf(\?v=\d+.\d+.\d+)?$/, loader: 'file-loader?limit=10000&mimetype=application/octet-stream'},
      {test: /\.svg(\?v=\d+.\d+.\d+)?$/, loader: 'file-loader?limit=10000&mimetype=image/svg+xml'},
      {test: /\.(jpe?g|png|gif)$/i, loaders: ['file']},
      {test: /\.ico$/, loader: 'file-loader?name=[name].[ext]'},
      {
        test: /(\.css|\.scss)$/,
        include: path.join(__dirname, 'src'),
        loader: ExtractTextPlugin.extract('css?sourceMap!sass?sourceMap')
      }
    ]
  }
};