webpack.config.js

const { resolve } = require('path')
const webpack = require('webpack')
const UglifyJsPlugin = require('uglifyjs-webpack-plugin')
const HtmlWebpackPlugin = require('html-webpack-plugin')
const BundleAnalyzerPlugin = require('webpack-bundle-analyzer').BundleAnalyzerPlugin

const isProd = process.env.NODE_ENV === 'production'
const prodUrl = ''

module.exports = {
  entry: isProd
    ? [
      'babel-polyfill',
      'react',
      'react-dom',
      './app/main.js',
    ]
    : [
      'babel-polyfill',
      'react-hot-loader/patch',
      './app/main.js',
    ],

  output: {
    filename: isProd ? 'js/[name].[hash].js' : 'js/bundle.js',
    path: resolve(__dirname, 'dist'),
    publicPath: isProd ? prodUrl : '/',
  },

  devServer: {
    historyApiFallback: true,
    contentBase: resolve(__dirname, 'dist'),
    publicPath: isProd ? prodUrl : '/',
  },

  node: {
    console: true,
    fs: 'empty',
    net: 'empty',
    tls: 'empty',
  },

  devtool: isProd ? 'cheap-module-source-map' : 'cheap-module-eval-source-map',

  module: {
    rules: [
      {
        test: /\.js$/,
        include: [ resolve(__dirname, 'app') ],
        loader: 'babel-loader',
      },
      {
        test: /\.css$/,
        use: ['style-loader', 'css-loader'],
      },
    ],
  },

  resolve: {
    alias: { 'app': resolve(__dirname, 'app') },
    extensions: ['.js'],
  },

  plugins: [
    new HtmlWebpackPlugin({
      filename: resolve(__dirname, 'dist/index.html'),
      template: resolve(__dirname, 'app/index.html'),
    }),
    ...(isProd
      ? [
        new BundleAnalyzerPlugin(),
        new webpack.optimize.ModuleConcatenationPlugin(),
        new UglifyJsPlugin(),
        new webpack.DefinePlugin({
          'process.env.NODE_ENV': JSON.stringify('production'),
        }),
      ]
      : []),
  ],
}