T
TanStack•4y ago
ambitious-aqua

Is onSuccess recreated on each render?

I have a custom mutation hook like this and I was wondering if there could be any cases where prevHemoglobinValue would be outdated in the onSuccess callback? 
export const useEditHemoglobinEntryMutation = () => {
  const dispatch = useDispatch();
  const queryClient = useQueryClient();

  const prevHemoglobinValue = useSelector(selectors.hemoglobinData.getLastHemoglobinValue);

  return useMutation(
    async (payload: HemoglobinLevel) => {
      await Api.editHemoglobinValue(payload.id, payload);
    },
    {
      onSuccess: async (_, entry) => {
        maybeShowModal(prevHemoglobinValue, entry.value, dispatch);
      },
    },
  );
};
export const useEditHemoglobinEntryMutation = () => {
  const dispatch = useDispatch();
  const queryClient = useQueryClient();

  const prevHemoglobinValue = useSelector(selectors.hemoglobinData.getLastHemoglobinValue);

  return useMutation(
    async (payload: HemoglobinLevel) => {
      await Api.editHemoglobinValue(payload.id, payload);
    },
    {
      onSuccess: async (_, entry) => {
        maybeShowModal(prevHemoglobinValue, entry.value, dispatch);
      },
    },
  );
};
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