contentlayer.config.js

import remarkGfm from "remark-gfm";
import remarkEmbedder from "@remark-embedder/core";
import oembedTransformer from "@remark-embedder/transformer-oembed";
import rehypeSlug from "rehype-slug";
import rehypePrettyCode from "rehype-pretty-code";
import rehypeAutolinkHeadings from "rehype-autolink-headings";
import rehypeExternalLink from "rehype-external-links";
import rehypeShiftHeading from "rehype-shift-heading";
import { rehypeAccessibleEmojis } from "rehype-accessible-emojis";
import { defineDocumentType, makeSource } from "contentlayer/source-files";

export const Blog = defineDocumentType(() => ({
  name: "Blog",
  filePathPattern: `**/*.mdx`,
  contentType: "mdx",
  fields: {
    title: {
      type: "string",
      description: "The title of the blog",
      required: true,
    },
    date: {
      type: "date",
      description: "The date of the blog",
      required: true,
    },
    summary: {
      type: "string",
      description: "The summary of the blog",
      required: true,
    },
  },
  computedFields: {
    url: {
      type: "string",
      resolve: (blog) => `/blog/${blog._raw.flattenedPath}`,
    },
    slug: {
      type: "string",
      resolve: (doc) => doc._raw.flattenedPath,
    },
  },
}));

export default makeSource({
  contentDirPath: "content",
  documentTypes: [Blog],
  mdx: {
    remarkPlugins: [
      remarkGfm,
      [
        remarkEmbedder.default,
        {
          transformers: [
            [
              oembedTransformer.default,
              {
                params: {
                  dnt: true,
                  theme: "dark",
                  omit_script: true,
                },
              },
            ],
          ],
        },
      ],
    ],
    rehypePlugins: [
      rehypeSlug,
      rehypeAccessibleEmojis,
      [
        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"];
          },
        },
      ],
      [
        rehypeShiftHeading,
        {
          shift: 1,
        },
      ],
      [
        rehypeAutolinkHeadings,
        {
          properties: {
            className: ["anchor"],
          },
        },
      ],
      [
        rehypeExternalLink,
        {
          target: "_blank",
        },
      ],
    ],
  },
});