fix: hydration error on small device (chat-header) #546
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Issue & Resolution Note for Vercel AI Chat Repo
Issue:#535
The chat app encountered a hydration mismatch error due to the use of the useWindowSize hook. This occurred because server-side rendered content couldn’t access the window dimensions, causing a mismatch when the client-side rendered content based on the actual window width.
Resolution:
To fix this, we added a client-side mounting check using an isMounted state tracker:
Initially rendered a simplified header that matched the SSR output.
After the client was mounted, we rendered the full header with width-dependent content.
This ensures consistent rendering between server and client, following React’s SSR best practices.
Fixed Component: components/chat-header.tsx
