How to properly check the contents of prefetched data?

Question

I have dynamic route with SSG and if coming product slug is not in db I want to return notFound: true after prefetching. How to do it the right way? Right now I'm doing it like this but it looks like hack

`export const getStaticProps: GetStaticProps = async (ctx) = {
  const ssg = await createServerSideHelpers({
    router: appRouter,
    ctx: await createContext(),
    transformer: superjson,
  });

await ssg.public.product.prefetch({
    slug: ctx.params?.slug as string,
  });

const product = ssg.dehydrate().json.queries[0].state.data;

if (!product) {
    return {
      notFound: true,
    };
  }

return {
    props: {
      trpcState: ssg.dehydrate(),
      slug: ctx.params?.slug,
    },
  };
};`

How to properly check the contents of prefetched data?

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