Type of createServerSideHelpers?

export async function createServerSideProps(
  ctx: GetServerSidePropsContext,
  callback: (helpers/**: ???? */) => Record<string, any>
) {
  const helpers = createServerSideHelpers({
    router: appRouter,
    ctx: {
      user: await getServerSession(ctx.req, ctx.res, authOptions),
    },
    transformer: superjson,
  });

  const props = callback(helpers);

  return {
    props,
  };
}