contentlayer.config.js

import { defineDocumentType, makeSource } from 'contentlayer/source-files'
import rehypeAutolinkHeadings from 'rehype-autolink-headings'
import rehypePrettyCode from 'rehype-pretty-code'
import rehypeSlug from 'rehype-slug'

export const Post = defineDocumentType(() => ({
  name: 'Post',
  filePathPattern: `**/*.mdx`,
  contentType: 'mdx',
  fields: {
    title: {
      type: 'string',
      required: true,
    },
    description: {
      type: 'string',
      required: true,
    },
    tags: {
      type: 'list',
      of: { type: 'string' },
      required: true,
    },
    date: {
      type: 'date',
      required: true,
    },
  },
  computedFields: {
    slug: {
      type: 'string',
      resolve: (post) => `${post._raw.flattenedPath}`,
    },
  },
}))

export default makeSource({
  contentDirPath: 'posts',
  documentTypes: [Post],
  mdx: {
    rehypePlugins: [
      rehypeSlug,
      [
        rehypeAutolinkHeadings,
        {
          properties: {
            className: ['subheading-anchor'],
            ariaLabel: 'Link to section',
          },
        },
      ],
      [
        rehypePrettyCode,
        {
          theme: 'github-dark',
          keepBackground: false,
          onVisitHighlightedLine(node) {
            node.properties.className.push('line--highlighted')
          },
          onVisitHighlightedChars(node) {
            node.properties.className = ['word--highlighted']
          },
        },
      ],
    ],
  },
})