webpack.server.config.babel.js

import fs from 'fs'
import webpack from 'webpack'
import path from 'path'
import ExtractTextPlugin from 'extract-text-webpack-plugin'

module.exports = {
  entry: path.resolve(__dirname, 'server.js'),
  output: {
    filename: 'server.bundle.js',
  },
  target: 'node',
  // keep node_module paths out of the bundle
  externals: fs.readdirSync(path.resolve(__dirname, 'node_modules')).concat([
    'react-dom/server', 'react/addons',
  ]).reduce((ext, mod) => {
    ext[mod] = 'commonjs ' + mod
    return ext
  }, {}),
  node: {
    __filename: true,
    __dirname: true,
  },
  module: {
    loaders: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        loader: 'babel-loader',
      },
      {
        test: /\.(scss|css)$/,
        loader: ExtractTextPlugin.extract('style-loader', 'css-loader!sass-loader'),
      },
      {
        test: /\.(otf|png|jpg|jpeg|gif|svg|woff|woff2)(\?v=[0-9]\.[0-9]\.[0-9])?$/,
        loader: 'url-loader?limit=10000',
      },
      {
        test: /\.(eot|ttf|wav|mp3)(\?v=[0-9]\.[0-9]\.[0-9])?$/,
        loader: 'file-loader',
      },
      {
        test: /\.json$/,
        loader: 'json-loader',
      },
    ],
  },
  plugins: [
    new ExtractTextPlugin(('app.css'), { allChunks: true }),
    new webpack.optimize.DedupePlugin(),
    new webpack.optimize.OccurrenceOrderPlugin(),
    new webpack.optimize.UglifyJsPlugin(),
  ],
}