Transitioning an application to Next.js App Router provides improved layout caching, server component isolation, and automated package routing.
However, teams migrating from legacy setups often encounter hydration mismatch warnings. These mismatch alerts occur when the server-compiled markup differs from the client-side state (e.g. from local storage themes or window size variables).
To bypass these checks safely, developers should isolate client-specific actions inside useEffect hooks, avoiding raw browser variable evaluations during initial server compilation runs.
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