webpack-config.js

var webpack = require('webpack');

var isProduction = process.env.NODE_ENV == 'production';

var plugins = [];

if (isProduction) {
  plugins.push(new webpack.optimize.UglifyJsPlugin())
}

module.exports = {
  devtool: !isProduction ? 'inline-source-maps' : 'source-map',

  entry: !isProduction ? [
    'webpack-dev-server/client?http://localhost:3000',
    'webpack/hot/only-dev-server',
    './src/entry.js'
  ] : ['./src/entry.js'],

  output: {
    path: __dirname + '/public/',
    publicPath: '/',
    filename: 'bundle.js'
  },

  plugins: plugins,

  module: {
    loaders: [{
      test: /\.jsx?$/,
      loaders: isProduction ? ['babel'] : ['react-hot', 'babel'],
      exclude: /node_modules/,
    }, {
      test: /\.scss$/,
      loaders: ['style', 'css', 'autoprefixer', 'sass']
    }]
  }
};