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The 'use client' directive in Next.js is a serialization boundary, not a toggle. Learn how to isolate interactivity to client islands while keeping data fetching on the server to reduce bundle size.
Framer Motion's animation primitives depend on browser APIs, so inside the Next.js App Router they must sit behind a client boundary marked with use client . A small React application can therefore adopt motion.* components piece by piece while unconverted routes keep their existing CSS transitions. The interoperability question is what happens at the seam.
framermotion
nextjs