
Next.js 16.4 recommends Cache Components for every app. New create-next-app projects have it enabled by default, and it becomes the default in Next.js 17. It adds ensureStatic to guarantee that a route's shell, prefetch or navigation is static.
Turbopack's disk cache is 20 to 25 percent smaller, with lazy server HMR and a shared runtime chunk. The release ships React 19.3 with stable View Transitions and Fragment Refs, and adds a next upgrade --agent command for agent-driven upgrades.
Full details: https://nextjs.org/blog/next-16-4
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