Shouldn't failed mutation return isError equals true?

[vineetdigit]

When the mutation fails, the onError callback gets called as expected. But the value of 'isError' is 'false'. Shouldn't it be true for failed mutations?

   const { mutate, isLoading, isError, error, reset } = useMutation(
    async args => {
      try {
        let response = await axios.post(mutationKey, args);
        return response.data;
      } catch (error) {
        throw error.response.data.error;
      }
    }
  );

  reset();
  mutate(args,
      {
        onSuccess: (data, variables, context) => {..do something..}
        onError: (data, variables, context) => {
          console.log("mutation failed", isError);
        }
      }
    );
  }

Another related question is, at what point isLoading become true? Is it as soon as mutate() is called?

[TkDodo]

you're calling reset() during render. Don't do that.