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developing-nextjs
// Next.js 16.x development guide covering App Router, Server Components, Turbopack, React Compiler, proxy.ts, Cache Components, opt-in caching APIs (updateTag/revalidateTag/refresh), strict TypeScript, Tailwind CSS 4.x, Prisma 7.x, Zod 4.x, Vitest 4.x, Playwright, Docker. MUST load when package.json contains 'next' or next.config.* is detected. For React-specific concerns (internals, performance rules, animation, RTL testing), use developing-react. SaaS構築パターン（認証・決済・AI統合）を含む。 For AI integration with Vercel AI SDK and LangChain.js, use integrating-ai-web-apps. For application logging design and structured logging patterns, use implementing-observability. For Tailwind CSS methodology, component design patterns, and customization, use styling-with-tailwind. For Firebase platform details (Auth/Firestore/Rules)→developing-firebase.
