refactor: code

Author: cap-Bernardito

README.md

@@ -264,12 +264,29 @@ module.exports = {
       new CssMinimizerPlugin({
         minimizerOptions: [
           {}, // Options for the first function (CssMinimizerPlugin.cssnanoMinify)
-          {}, // Options for the second function (CssMinimizerPlugin.cleanCssMinify)
+          {}, // Options for the second function
           {}, // Options for the third function
         ],
         minify: [
           CssMinimizerPlugin.cssnanoMinify,
-          CssMinimizerPlugin.cleanCssMinify,
+          async (data, inputMap) => {
+            // eslint-disable-next-line global-require
+            const CleanCSS = require('clean-css');
+
+            const [[filename, input]] = Object.entries(data);
+            const minifiedCss = await new CleanCSS({ sourceMap: true }).minify({
+              [filename]: {
+                styles: input,
+                sourceMap: inputMap,
+              },
+            });
+
+            return {
+              code: minifiedCss.styles,
+              map: minifiedCss.sourceMap.toJSON(),
+              warnings: minifiedCss.warnings,
+            };
+          },
           async (data, inputMap, minimizerOptions) => {
             // To do something
             return {