diff --git a/test/karma.conf.js b/test/karma.conf.js
index e734b45016839..25c0eb8f68ec0 100644
--- a/test/karma.conf.js
+++ b/test/karma.conf.js
@@ -70,12 +70,7 @@ module.exports = function setKarmaConfig(config) {
           {
             test: /\.(js|ts|tsx)$/,
             loader: 'babel-loader',
-            exclude: function ignore(filePath) {
-              if (filePath.includes('/node_modules/')) {
-                return !filePath.includes('/node_modules/@mui/monorepo');
-              }
-              return false;
-            },
+            exclude: /node_modules\/.*\/node_modules\/(?!@mui\/monorepo)/,
           },
         ],
       },
diff --git a/test/utils/setupBabel.js b/test/utils/setupBabel.js
index 23c823b95e91a..b6b7c493dd008 100644
--- a/test/utils/setupBabel.js
+++ b/test/utils/setupBabel.js
@@ -1,11 +1,4 @@
 require('@babel/register')({
   extensions: ['.js', '.ts', '.tsx'],
-  ignore: [
-    function ignore(filePath) {
-      if (filePath.includes('/node_modules/')) {
-        return !filePath.includes('/node_modules/@mui/monorepo');
-      }
-      return false;
-    },
-  ],
+  ignore: [/node_modules\/.*\/node_modules\/(?!@mui\/monorepo)/],
 });
diff --git a/webpackBaseConfig.js b/webpackBaseConfig.js
index 46fe6c52d8cfc..aea83b8b73c24 100644
--- a/webpackBaseConfig.js
+++ b/webpackBaseConfig.js
@@ -42,12 +42,7 @@ module.exports = {
     rules: [
       {
         test: /\.(js|ts|tsx)$/,
-        exclude: function ignore(filePath) {
-          if (filePath.includes('/node_modules/')) {
-            return !filePath.includes('/node_modules/@mui');
-          }
-          return false;
-        },
+        exclude: /node_modules\/.*\/node_modules\/(?!@mui)/,
         loader: 'babel-loader',
         options: {
           cacheDirectory: true,