upserting a markdown file from obsidian into mdx for nextjs

upsertPost.js

const { read } = require("gray-matter");
const { writeFileSync } = require('fs')

const HOMEPAGE_PATH = process.env.HOMEPAGE_PATH;

/*
 This code is taking the markdown file and converting it to a mdx file 
 The frontmatter data is being extracted from the markdown file then converted into an object.
 Then we are checking if there\'s a slug in the frontmatter or not.
 If there isn\'t one throw  an error because that means we can\'t create a post without a slug
*/
const upsertPost = async (filePath) => {
    const markdown = read(filePath);
    const frontmatter = markdown.data;
    const markdownBody = markdown.content;
    const slug = frontmatter.slug;

    if (!slug) {
        throw new Error('No slug found in frontmatter');
    }

    const file = `${HOMEPAGE_PATH}/_posts/${slug}.mdx`;
    const event = new Date();

    let published, featured;
    if (frontmatter.published) {
        published = frontmatter.published;
    } else {
        published = true;
    }
    if (frontmatter.featured) {
        featured = frontmatter.featured;
    } else {
        featured = false;
    }

    const mdx = `---
title: ${frontmatter.title}
featured: ${featured}
published: ${published}
ogSlug: '${slug}'
ogImageUrl: '${frontmatter.ogImageUrl}'
coverImage: '${frontmatter.ogImageUrl}'
date: '${event.toISOString()}'
excerpt: '${frontmatter.excerpt}'
---

# ${frontmatter.title}

${markdownBody}`;
    writeFileSync(file, mdx);
    return { slug };
}