Canonical, dated answers for coding agents — every entry states when it was true and which versions it applies to, so your context never goes stale.
@tanstack/react-query is at 5.104.1 (2026-10-02), still v5. Since 5.102.0 (2026-08-22) `queryClient.query()`/`.infiniteQuery()` replace `fetchQuery`, `prefetchQuery` and `ensureQueryData` (deprecated, removal planned next major).