const merge = require("webpack-merge"); const common = require("./webpack.common.js"); const UglifyJsPlugin = require("uglifyjs-webpack-plugin"); const OptimizeCSSAssetsPlugin = require("optimize-css-assets-webpack-plugin"); module.exports = merge(common, { optimization: { minimizer: [ new UglifyJsPlugin({ cache: true, parallel: true, sourceMap: true }), new OptimizeCSSAssetsPlugin({}) ] }, devtool: "source-map", mode: "production" });