contentlayer.config.js

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

/** @type {import('contentlayer/source-files').ComputedFields} */
const computedFields = {
  slug: {
    type: "string",
    resolve: (doc) => doc._raw.flattenedPath,
  },
  structuredData: {
    type: "object",
    resolve: (doc) => ({
      "@context": "https://schema.org",
      "@type": "BlogPosting",
      headline: doc.title,
      datePublished: doc.publishedAt,
      dateModified: doc.publishedAt,
      description: doc.summary,
      image: doc.image
        ? `${process.env.NEXT_PUBLIC_URL}${doc.image}`
        : `${process.env.NEXT_PUBLIC_URL}/api/og?title=${doc.title}`,
      url: `${process.env.NEXT_PUBLIC_URL}/blog/${doc._raw.flattenedPath}`,
      author: {
        "@type": "Person",
        name: "Herman White",
      },
    }),
  },
}

export const Blog = defineDocumentType(() => ({
  name: "Blog",
  filePathPattern: `**/*.mdx`,
  contentType: "mdx",
  fields: {
    title: {
      type: "string",
      required: true,
    },
    publishedAt: {
      type: "string",
      required: true,
    },
    summary: {
      type: "string",
      required: true,
    },
    image: {
      type: "string",
    },
  },
  computedFields,
}))

export default makeSource({
  contentDirPath: "content",
  documentTypes: [Blog],
  mdx: {
    remarkPlugins: [remarkGfm],
    rehypePlugins: [
      rehypeSlug,
      [
        rehypePrettyCode,
        {
          theme: "one-dark-pro",
          keepBackground: false,
          onVisitHighlightedLine(node) {
            node.properties.className = node.properties.className === undefined ? [] : node.properties.className
            node.properties.className?.push("data-highlighted-line")
          },
          onVisitHighlightedChars(node) {
            node.properties.className = ["data-highlighted-chars"]
          },
        },
      ],
      [
        rehypeAutolinkHeadings,
        {
          properties: {
            className: ["anchor"],
          },
        },
      ],
    ],
  },
})