Next.js 16 Migration Guide: Turbopack, Proxy, Cache Components, and Every Breaking Change Explained

The complete, production-tested guide to upgrading from Next.js 15 to Next.js 16. Covers the Turbopack-only bundler, the middleware-to-proxy migration, async request APIs, Cache Components with 'use cache', Partial Prerendering by default, memory optimization in containers, and step-by-step codemods for every breaking change.