css代码提取后想要压缩 —— 使用css-minimizer-webpack-plugin插件

• 下载 css-minimizer-webpack-plugin 本地软件包

npm install css-minimizer-webpack-plugin --save-dev

• 配置 webpack.config.js 让webpack拥有该功能

const CssMinimizerPlugin = require('css-minimizer-webpack-plugin');

optimization: {
    minimizer: [
      //原本压缩的js优化功能留在原地
      `...`,
      new CssMinimizerPlugin(),
    ],
  },