const { merge } = require('webpack-merge'); const webpack = require('webpack'); const baseConfig = require('./webpack.base.config.js'); module.exports = merge(baseConfig, { plugins: [ new webpack.DefinePlugin({ 'process.env': { 'NODE_ENV': JSON.stringify('production') } }), new webpack.optimize.AggressiveMergingPlugin()// Merge chunks ], mode: 'production' });