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Why tanstack query deprecated onSuccess callback in v5.
Can someone explain it in simple terms?
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#tanstack_query #react_query
@mattpocockuk I'm afraid it's neither @mattpocockuk .
For { data } = useQuery(...),
the library makers (#Tanstack_Query) correctly types "data" as (TData | undefined), the app developer ought to ensure a default/sentinel value of type TData to offset "undefined"
See: https://t.co/z9nMzXOT4v
@jayphelps It's a common anti-pattern in programming in general (not just React) & i have seen many engineers do it. It's a good guideline of preventive debugging to never propagate null/undefined values through a program.
See solution below (It's called the null object pattern):
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