How do mutations work with react-query?

[Maniktherana]

Is this how mutations would work with react-query or am I missing anything?

type UseMutationOptions<T> = ParamsOption<T> &
  RequestBodyOption<T> & {
    reactQuery?: {
      enabled: boolean;
      onSuccess?: (data: unknown) => void;
      onError?: (error: unknown) => void;
    };
  };

const ADD_DATA = "/add";
export function addMetric({
  params,
  body,
  reactQuery,
}: UseMutationOptions<paths[typeof ADD_DATA]["post"]>) {
  return useMutation({
    ...reactQuery,
    mutationFn: async () => {
      const { data } = await client.POST(ADD_DATA, {
        body,
      });
      return data;
    },
  });
}

edit:
using this shows that { data } is of type of unknown when that shouldn't be the case based off generated types. if I do const data =... it returns something like

FetchResponse<{
    parameters: { ... };
    requestBody: { ... };
    responses: { ... };
}>

would help if the examples could be extended

[Maniktherana]

On further investigation it seems it's client.POST itself that's returning the above mentioned type instead of the one defined in the generated types