posts setup

.vitepress/utils.ts

@@ -0,0 +1,9 @@
+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;
+    },
+    {} as Record<K, T[]>,
+  );
+}