Function IsMutating

packages/react-query/src/__tests__/useMutationState.test.tsx:23–29

()

    const key2 = queryKey()

    function IsMutating() {
      const isMutating = useIsMutating()

      isMutatingArray.push(isMutating)

      return null
    }

    function Mutations() {
      const { mutate: mutate1 } = useMutation({