Setup React App - Organizing React Application Part 1

webpack.prod.js

const webpack = require('webpack');
const merge = require('webpack-merge');
const UglifyJSPlugin = require('uglifyjs-webpack-plugin');
const common = require('./webpack.common.js');

module.exports = merge(common, {
  mode: 'production',
  plugins: [
    new webpack.SourceMapDevToolPlugin({
      filename: '[name].js.map',
      exclude: ['bundle.js']
    }),
    new UglifyJSPlugin({
      sourceMap: true
    }),
    new webpack.DefinePlugin({
      'process.env.NODE_ENV': JSON.stringify('production')
    })
  ]
});