Why Monorepo?

Single source of truth: Shared UI, config, and types.

Faster release cycle: Packages are tested together.

Cost: CI/CD simplifies.

Our Suggested Stack

Next.js 14+ (App Router, RSC, Route Handlers)

Firebase (Auth, Firestore, Storage; Functions if needed)

Turborepo (task caching) + ESLint/Prettier

Production Considerations

Environment variables: .env.local is only read on the server side.

Edge or Node? Select API routes according to necessity.

Determine ISR and caching policy.

Measurement and Improvement

Core Web Vitals targets: LCP < 2.5s, INP < 200ms.

Internal Link Suggestions:

[Cybersecurity checklist] → CSP/HSTS

[Cloud Strategy] → Transition from Firebase to multi-cloud

Next.js Security Checklist: CSP, HSTS, and Secret Key Management