css-minimizer-webpack-plugin用于压缩min-css-extract-plugin生成的css文件。下面是thy的使用方法（我在webpack.config.js中）：

//min-css-extract-plugin goes in the plugins array
 plugins: [
    new MiniCssExtractPlugin({
      filename:
        mode === "production"
          ? "css/[name].[contenthash].chunk.css"
          : "css/[name].css",
    }),
  ],
 //css-minimizer-webpack-plugin goes in the optimization object in minimizer array
 optimization:{
  minimizer: ["...", new CssMinimizerPlugin()],
 }