description: Next.js 15+/16 App Router rules globs: ["app/", "components/", "lib/**", ".ts", ".tsx"] alwaysApply: true

Next.js rules

• Server Components by default. Use "use client" only when truly needed.
• params, searchParams, cookies(), headers() are Promises — await them.
• Fetch on the server. Keep client components small and stateful only.
• No any. Type props explicitly.
• Tailwind only for styling. Use cn() for conditional classes.
• No getServerSideProps / getStaticProps.