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2026-06-11 12:46:57 +07:00
parent 1993d88306
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--- a/.agents/skills/vercel-react-best-practices/rules/bundle-defer-third-party.md
+++ b/.agents/skills/vercel-react-best-practices/rules/bundle-defer-third-party.md
@@ -0,0 +1,48 @@
+---
+title: Defer Non-Critical Third-Party Libraries
+impact: MEDIUM
+impactDescription: loads after hydration
+tags: bundle, third-party, analytics, defer
+---
+
+## Defer Non-Critical Third-Party Libraries
+
+Analytics, logging, and error tracking don't block user interaction. Load them after hydration.
+
+**Incorrect (blocks initial bundle):**
+
+```tsx
+import { Analytics } from '@vercel/analytics/react';
+
+export default function RootLayout({ children }) {
+  return (
+    <html>
+      <body>
+        {children}
+        <Analytics />
+      </body>
+    </html>
+  );
+}
+```
+
+**Correct (loads after hydration):**
+
+```tsx
+import dynamic from 'next/dynamic';
+
+const Analytics = dynamic(() => import('@vercel/analytics/react').then((m) => m.Analytics), {
+  ssr: false
+});
+
+export default function RootLayout({ children }) {
+  return (
+    <html>
+      <body>
+        {children}
+        <Analytics />
+      </body>
+    </html>
+  );
+}
+```