Really basic Webpack configuration

webpack.config.js

var webpack = require('webpack')
var path = require('path')

var NODE_ENV = process.env.NODE_ENV || 'development'
var conf = {
  entry: {
    'front-end': [path.join(__dirname, '/client/front/front-end.js')],
    'back-end': [path.join(__dirname, '/client/back/back-end.js')]
  },
  output: {
    publicPath: '/public',
    path: path.join(__dirname, '/public/' + NODE_ENV),
    filename: '[name].js'
  },
  module: {
    loaders: [
      { test: /\.(png|woff|woff2|eot|ttf|svg)$/, loader: 'url-loader?limit=100000' },
      {
        test: /\.css$/,
        exclude: /(node_modules|global)/,
        loader: 'style!css-loader?modules&importLoaders=1&localIdentName=[name]__[local]__[hash:base64:5]!postcss-loader'
      },
      {
        test: /\.css$/,
        loader: 'style!css!postcss',
        include: /global/
      }
    ]
  },
  plugins: [
    new webpack.ProvidePlugin({
      fetch: 'imports?this=>global!exports?global.fetch!whatwg-fetch'
    }),
    new webpack.DefinePlugin({
      'process.env': {
        'NODE_ENV': JSON.stringify(NODE_ENV)
      }
    }),
    new webpack.DefinePlugin({
      NODE_ENV: JSON.stringify(NODE_ENV)
    }),
    new webpack.DefinePlugin({
      BASE_URL: JSON.stringify('http://localhost:3000')
    })
  ]
}

if (NODE_ENV === 'production') {
  conf.plugins.push(
    new webpack.optimize.UglifyJsPlugin({
      compress: { warnings: false },
      comments: false
    })
  )
} else if (NODE_ENV === 'development') {
  let onlyServer = 'webpack/hot/only-dev-server'
  let mwClient = 'webpack-hot-middleware/client'

  conf.entry['front-end'].splice(1, 0, onlyServer, mwClient)
  conf.entry['back-end'].splice(1, 0, onlyServer, mwClient)

  conf.plugins.push(new webpack.optimize.OccurrenceOrderPlugin())
  conf.plugins.push(new webpack.HotModuleReplacementPlugin())
  conf.plugins.push(new webpack.NoErrorsPlugin())
  conf.module.loaders.push({ test: /\.(js|jsx)$/, exclude: /(node_modules|server)/, loaders: ['react-hot', 'babel'] })
}

module.exports = conf