prod.config.js

// Webpack config for creating the production bundle.
require('babel-polyfill');
require('es6-promise').polyfill();

var path = require('path');
var webpack = require('webpack');
var ExtractTextPlugin = require('extract-text-webpack-plugin');
var strip = require('strip-loader');
var VersionFile = require('webpack-version-file-plugin');
var webpackFileTransformPlugin = require('webpack-file-transform-plugin')
var assetsPath = path.join(__dirname, '../dist');
var bourbon = require('node-bourbon').includePaths;



module.exports = {
  devtool: null,
  context: path.resolve(__dirname, '..'),
  entry: {
    'main': './src/js/client.js',
    'vendor': ['falcor', 'react', 'lodash', 'd3', 'ramda', 'immutable']
  },
  output: {
    path: assetsPath,
    filename: '[name]-[hash].js',
    chunkFilename: 'chunk-[name]-[chunkhash].js',
    publicPath: '/dist/'
  },
  module: {
    loaders: [
      { test: /\.js$/, exclude: /node_modules/, loaders: [strip.loader('debug'), 'babel']},
      { test: /\.json$/, loader: 'json-loader' },
      { test: /\.css$/, loader: 'style!css' },
      { test: /\.scss$/, loader: ExtractTextPlugin.extract('style', 'css!autoprefixer?browsers=last 2 version!sass?includePaths[]=' + bourbon) },
      { test: /\.(woff|ttf|eot)$/, loader: 'url-loader?limit=8000' }
        ]
  },
  debug: true,


  progress: true,
  resolve: {
    modulesDirectories: [
      'src/js',
      'node_modules',
      'node_modules/leaflet/dist'
    ],
    extensions: ['', '.json', '.js']
  },
  plugins: [
    // css files from the extract-text-plugin loader
    new ExtractTextPlugin('[name]-[chunkhash].css', { allChunks: true }),
    new webpack.DefinePlugin({
      __CLIENT__: true,
      __SERVER__: false,
      __DEVELOPMENT__: false,
      __DEVTOOLS__: false,
      __TEST__: false
    }),

    // ignore dev config
    new webpack.IgnorePlugin(/\.\/dev/, /\/config$/),

    // set global vars
    new webpack.DefinePlugin({
      'process.env': {
        // Useful to reduce the size of client-side libraries, e.g. react
        NODE_ENV: JSON.stringify('production'),
        SERVER: JSON.stringify(process.env.SERVER)
      }
    }),

    // optimizations
    new webpack.optimize.OccurenceOrderPlugin(),
    new webpack.optimize.UglifyJsPlugin({
      beautify: false,
      comments: false,
      minimize: true,
      sourceMap: false,
      compress: {
          warnings: false,
          dead_code: true,
        }
    }),
    new webpack.optimize.CommonsChunkPlugin('vendor', '[name]-[hash].js'),
    // add version file
    new VersionFile({
      templateString: "build-date: " + new Date(),
    }),
    new webpackFileTransformPlugin({
      path: path.join(__dirname, '../version.txt'),
      outputPath: path.join(__dirname, '../dist/version.txt'),
    }),
  ]
};

tree

.
└── js
    ├── actions
    ├── app
    ├── build
    ├── charts
    ├── client.js
    ├── components
    ├── config.js this file gets resolved
    ├── constants
       files in this directory can get resolved in js/server.js
    ├── falcor
    ├── helpers
    ├── reducers
    ├── redux
    ├── routes
    ├── selector
    ├── server.js
    ├── start-server.js