style: format with new style

.vitepress/utils.ts

@@ -1,9 +1,12 @@
-export function groupBy<T, K extends keyof any>(arr: T[], key: (i: T) => K): Record<K, T[]> {
+export function groupBy<T, K extends keyof any>(
+  arr: T[],
+  key: (i: T) => K
+): Record<K, T[]> {
   return arr.reduce(
     (groups, item) => {
-      (groups[key(item)] ||= []).push(item);
-      return groups;
+      ;(groups[key(item)] ||= []).push(item)
+      return groups
     },
-    {} as Record<K, T[]>,
-  );
+    {} as Record<K, T[]>
+  )
 }