serialize.js

export async function getStaticProps({ params }) {
   const response = await fetch(
      `https://nextjs-blog-afatihyavasi.herokuapp.com/posts?slug=${params.slug}`
   );
   const data = await response.json();
   const content = await serialize(data[0].content);
   return {
      props: {
         data: data[0],
         content,
      },
   };
}