tanstack-query

Migrating React Query to v5 requires switching to object syntax for hooks, replacing cacheTime with gcTime, using isPending for loading states, and adding explicit initialPageParam for infinite queries to ensure correct cache timing and state handling.

Optimistic updates in TanStack Query use mutation patterns to immediately update the UI cache before server confirmation, then automatically roll back changes if the mutation fails, ensuring reliable React data fetching during network operations.

SSR hydration debugging in TanStack Query requires proper server state prefetching and dehydration on the server side, then rehydrating the query cache on the client to prevent mismatches and ensure reliable React data fetching.

Infinite queries in TanStack Query v5 require an explicit initialPageParam property to define the starting page, replacing the previous implicit default, along with object syntax for the useInfiniteQuery hook configuration.

The throwOnError option in TanStack Query safely integrates query errors with React error boundaries, allowing you to catch and render fallback UI for failed fetches rather than handling errors manually in every component.

TanStack Query v5 supports offline-first network modes that pause mutations and queue them for retry when connectivity returns, allowing React applications to maintain server state synchronization during intermittent network conditions.