react-query code generation useXXXMutation signature

[jbreuil]

When using the react-query plugin to codegen I don't understand why useXXXQuery expose variable has an argument while useXXXMutation encapsulate them in the option object. What is the reasoning behind it?

export const useCreateBookMutation = <
      TError = unknown,
      TContext = unknown,
    >(options?: UseMutationOptions<CreateBookMutation, TError, CreateBookMutationVariables, TContext>) =>
    useMutation<CreateBookMutation, TError, CreateBookMutationVariables, TContext>(
      ['CreateBook'],
      (variables?: CreateBookMutationVariables) => useGraphQLAPI<CreateBookMutation, CreateBookMutationVariables>(CreateBookDocument, variables)(),
      options,
    )

export const useGetBooksForAuthorQuery = <
      TData = GetBooksForAuthorQuery,
      TError = unknown,
    >(
    variables: GetBooksForAuthorQueryVariables,
    options?: UseQueryOptions<GetBooksForAuthorQuery, TError, TData>,
  ) =>
    useQuery<GetBooksForAuthorQuery, TError, TData>(
      ['GetBooksForAuthor', variables],
      useGraphQLAPI<GetBooksForAuthorQuery, GetBooksForAuthorQueryVariables>(GetBooksForAuthorDocument, variables),
      options,
    )