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02 POSTS

#react#state-management#tanstack-query
Is React Query's staleTime: 0 really 0?
I prefetched the data and hydrated it, and 30 runs in dev mode still logged 60 requests. The conclusion from my last post, that staleTime 0 was the cause, was wrong. React Query raises staleTime to a 1,000ms floor in Suspense, and that number exists because React throttles reveals by 300ms after the fallback commit. In my experiment, content was revealed at 308ms, 608ms and 908ms.
2026-10-039 min read
◆ Rendering Boundaries · Part 1
#react#nextjs#debugging
Rendering Boundaries[1]: Server Functions cannot be called during initial render
I traced an error that was piling up in DataDog at about 3,000 a week. The cause was that useSuspenseQuery runs queryFn during render, before commit, and a Server Function was sitting inside it. Instead of the advice to switch to useQuery, I pulled the read function out of the use server file and the error went to zero. But when I measured 30 runs in the same sandbox, the requests came back as 60. The server and the browser have different queryClients.
2026-10-0115 min read