Index: pages/index/Counter.tsx
===================================================================
--- pages/index/Counter.tsx	(revision 8ee45534cd667e6cced2ed96968c95d8de3b1029)
+++ pages/index/Counter.tsx	(revision 8ee45534cd667e6cced2ed96968c95d8de3b1029)
@@ -0,0 +1,11 @@
+import { useState } from "react";
+
+export function Counter() {
+  const [count, setCount] = useState(0);
+
+  return (
+    <button type="button" onClick={() => setCount((count) => count + 1)}>
+      Counter {count}
+    </button>
+  );
+}