chore umi: enable mfsu

.umirc.js

@@ -66,11 +66,12 @@ export default {
   theme: lessToJs(
     fs.readFileSync(path.join(__dirname, './src/themes/default.less'), 'utf8')
   ),
-  // webpack5: {},
+  webpack5: {},
+  mfsu: {},
   chainWebpack: function (config, { webpack }) {
     config.merge({
       optimization: {
-        minimize: true,
+        minimize: false,
         splitChunks: {
           chunks: 'all',
           minSize: 30000,