diff --git a/.vitepress/utils.ts b/.vitepress/utils.ts
index 961ad414c..3988e4dcc 100644
--- a/.vitepress/utils.ts
+++ b/.vitepress/utils.ts
@@ -1,3 +1,11 @@
 const arr = [{name: 'Alice', age: 30}, {name: 'Bob', age: 25}, {name: 'Charlie', age: 30}];
-const groupedByAge = groupBy(arr, item => item.age);
+
+const groupedByAge = arr.reduce((groups, item) => {
+  if (!groups[item.age]) {
+    groups[item.age] = [];
+  }
+  groups[item.age].push(item);
+  return groups;
+}, {});
+
 // groupedByAge is now equal to {25: [{name: 'Bob', age: 25}], 30: [{name: 'Alice', age: 30}, {name: 'Charlie', age: 30}]}