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',
  devtool: 'cheap-module-source-map',
  optimization: {
    minimizer: [
      new UglifyJSPlugin({
        cache: true,
        parallel: true,
        sourceMap: true,
        uglifyOptions: {
          compress: {
            dead_code: true,
            drop_console: true,
          },
        },
      }),
    ],
  },
  plugins: [
    new webpack.DefinePlugin({
      'process.env.NODE_ENV': JSON.stringify('production'),
    }),
  ],
});