diff --git a/apps/demo/next.config.js b/apps/demo/next.config.js
index bc37defc..66484c24 100644
--- a/apps/demo/next.config.js
+++ b/apps/demo/next.config.js
@@ -1,3 +1,5 @@
+// @ts-check
+
 /** @type {import('next').NextConfig} */
 const nextConfig = {
   reactStrictMode: true,