getStaticProps.ts

import { GetStaticProps } from "next";
import loadGreyMatterPost from "../lib/loadGreyMatterPost";
import transformGreyMatterToMDX from "../lib/transformGreyMatterToMDX";

export const getStaticProps: GetStaticProps = async ({ params }) => {
  try {
    const [post] = loadGreyMatterPost(params);
    const mdxSource = transformGreyMatterToMDX(postt);

    return {
      props: {
        source: mdxSource,
        post: {
          creator: post.data.creator,
          date: post.data.date.toString(),
          lang: post.data.lang,
          path: post.data.path,
          title: post.data.title,
        },
      },
    };
  } catch (e) {
    return { notFound: true };
  }
};