webpack.config.prod.js

const webpack = require('webpack');
const merge = require('webpack-merge');
const baseConfig = require('./webpack.config.base');

const settings = merge(baseConfig, {
  mode: 'production',
  module: {
    rules: [
    ]
  },
  optimization: {
    mergeDuplicateChunks: true,
    minimize: true,
    splitChunks: {
      chunks: 'async',
      minSize: 30000,
      maxSize: 0,
      minChunks: 1,
      maxAsyncRequests: 5,
      maxInitialRequests: 3,
      automaticNameDelimiter: '~',
      name: true,
      cacheGroups: {
        'vendors': {
          test: /[\\/]node_modules[\\/]/i,
          priority: -10,
          chunks: 'all',
        },
        default: {
          minChunks: 2,
          priority: -20,
          reuseExistingChunk: true
        }
      }
    }
  },
  plugins: [
    new webpack.DefinePlugin({
      'process.env': {
        NODE_ENV: '"production"'
      }
    }),
    new webpack.optimize.AggressiveMergingPlugin(),//Merge chunks
  ],
});

module.exports = settings;