webpack.config.prod.js

const path = require('path');
const webpack = require('webpack');

module.exports = {
  entry: path.join(__dirname, 'src', 'App.js'),

  output: {
    path: path.join(__dirname, 'app', 'bundle'),
    filename: 'app.js',
    // https://github.com/webpack/webpack/issues/1114
    libraryTarget: 'commonjs2'
  },

  module: {
    loaders: [
      {
        test: /.js?$/,
        loader: 'babel-loader',
        exclude: /node_modules/,
        query: {
          presets: ['es2015', 'react']
        }
      },
      {
        test: /\.css$/,
        loader: 'style-loader!css-loader'
      },
      {
        test: /\.png$/,
        loader: 'url-loader?limit=100000'
      },
      {
        test: /\.(woff|woff2)(\?v=\d+\.\d+\.\d+)?$/,
        loader: 'url-loader?limit=10000&mimetype=application/font-woff'
      },
      {
        test: /\.ttf(\?v=\d+\.\d+\.\d+)?$/,
        loader: 'url-loader?limit=10000&mimetype=application/octet-stream'
      },
      {
        test: /\.eot(\?v=\d+\.\d+\.\d+)?$/,
        loader: 'file-loader'
      },
      {
        test: /\.svg(\?v=\d+\.\d+\.\d+)?$/,
        loader: 'url-loader?limit=10000&mimetype=image/svg+xml'
      }
    ]
  },

  plugins: [
    new webpack.DefinePlugin({
      'process.env.NODE_ENV': JSON.stringify(process.env.NODE_ENV || 'production')
    }),

    new webpack.optimize.UglifyJsPlugin({
      comments: false
    })
  ]
}