webpack.production.config.js

const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const webpack = require('webpack');
const UglifyJSPlugin = require('uglifyjs-webpack-plugin');

module.exports = {
  entry: './src/index.js',
  output: {
    path: path.join(__dirname, '/dist/'),
    filename: 'index_bundle.js'
  },
  module: {
    rules: [
      {
        test: /\.css$/,
        enforce: 'pre',
        use: [
          'style-loader',
          'css-loader'
        ]
      },
      {
        test: /\.json$/,
        loader: 'json-loader'
      },
      {
        test: /\.js$/,
        loader: 'babel-loader',
        exclude: /node_modules/,
        query: {
          presets: ['es2017', 'react', 'stage-2', 'es2015']
        }
      },
      {
        test: /\.(ico|jpg|jpeg|png|gif|eot|otf|webp|svg|ttf|woff|woff2)(\?.*)?$/,
        use: {
          loader: 'file-loader',
          options: {
            name: 'assets/images/[name].[ext]'
          }
        }
      }
    ]
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: './src/index.html',
      filename: 'index.html',
      inject: 'body',
      minify: {
        removeComments: true,
        collapseWhitespace: true,
        removeRedundantAttributes: true,
        useShortDoctype: true,
        removeEmptyAttributes: true,
        removeStyleLinkTypeAttributes: true,
        keepClosingSlash: true,
        minifyJS: true,
        minifyCSS: true,
        minifyURLs: true
      }
    }),
    new webpack.LoaderOptionsPlugin({
      minimize: false,
      debug: false
    }),
    new UglifyJSPlugin({
      test: /\.js($|\?)/i,
      sourceMap: true,
      uglifyOptions: {
        compress: true
      }
    }),
    new webpack.HotModuleReplacementPlugin(),
    new webpack.NoEmitOnErrorsPlugin(),
    new webpack.DefinePlugin({
      'process.env.NODE_ENV': JSON.stringify('production')
    })]
};