Import md files in Next.js

Let's assume that you have the following folder structure in Next.js:

├── posts
|   ├── _data.js
|   ├── a.md
|   ├── b.md
|   ├── c.md
├── pages
|   ├── _app.js
|   ├── index.js
|   ├── [post].js

_data.js contains the Markdown's files info:

javascript
var posts = {
    'a':{
        'title': `Title A`,
        'date': [24, 'January', 2022]
    },
    'b':{
        'title': `Title B`,
        'date': [23, 'January', 2022]
    },
    'c':{
        'title': `Title C`,
        'date': [22, 'January', 2022]
    }
}

To display the content of each post depending on the slug ([post]):

javascript
import posts from '../posts/_data'
import fs from 'fs'
import { join } from 'path'

const postsDirectory = join(process.cwd(), 'posts')

const Post = ({ post }) => {

    return post
}

export async function getStaticPaths() {

    const paths = Object.keys(posts).map(key => ({
        params: { post: key}
    }))

    return { paths, fallback: false }

}
  
export async function getStaticProps({ params }) {

    const fullPath = join(postsDirectory, `${params.post}.md`)
    const fileContents = fs.readFileSync(fullPath, 'utf8')
  
    return { props: { post: fileContents } }
}
  
export default Post