contentlayer.config.ts

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

const Post = defineDocumentType(() => ({
  name: 'Post',
  filePathPattern: `**/*.mdx`,
  contentType: 'mdx',
  fields: {
    title: {
      type: 'string',
      description: 'The title of the post',
      required: true,
    },
    date: {
      type: 'date',
      description: 'The date of the post',
      required: true,
    },
    description: {
      type: 'string',
      description: 'The description of the post',
      required: true,
    },
  },
  computedFields: {
    url: {
      type: 'string',
      resolve: (doc) => `/posts/${doc._raw.flattenedPath}`,
    },
  },
}))

export default makeSource({
  contentDirPath: 'posts',
  documentTypes: [Post],
  mdx: {
    remarkPlugins: [remarkGfm],
    rehypePlugins: [
      rehypeSlug,
      [
        rehypePrettyCode,
        {
          theme: 'one-dark-pro',
          onVisitLine(node) {
            // Prevent lines from collapsing in `display: grid` mode, and allow empty
            // lines to be copy/pasted
            if (node.children.length === 0) {
              node.children = [{ type: 'text', value: ' ' }]
            }
          },
          onVisitHighlightedLine(node) {
            node.properties.className.push('line--highlighted')
          },
          onVisitHighlightedWord(node) {
            node.properties.className = ['word--highlighted']
          },
        },
      ],
      [
        rehypeAutolinkHeadings,
        {
          properties: {
            className: ['anchor'],
          },
        },
      ],
    ],
  },
})