contentlayer.config.ts

import {
  ComputedFields,
  defineDocumentType,
  makeSource,
} from "contentlayer/source-files";
import remarkGfm from "remark-gfm";
import rehypePrettyCode, {
  CharsElement,
  LineElement,
} from "rehype-pretty-code";
import rehypeSlug from "rehype-slug";
import rehypeAutolinkHeadings from "rehype-autolink-headings";
import readingTime from "reading-time";

const computedFields: ComputedFields = {
  slug: {
    type: "string",
    resolve: (doc) => doc._raw.flattenedPath.replace(/^.+?(\/)/, ""),
  },
  readingTime: {
    type: "json",
    resolve: (doc) => {
      return readingTime(doc.body.raw);
    },
  },
};

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",
    },
    draft: {
      type: "boolean",
      default: false,
    },
  },
  computedFields,
}));

export default makeSource({
  contentDirPath: "src/content/",
  documentTypes: [Blog],
  mdx: {
    remarkPlugins: [remarkGfm],
    rehypePlugins: [
      rehypeSlug,
      [
        //@ts-expect-error
        rehypePrettyCode,
        {
          theme: "one-dark-pro",
          keepBackground: false,

          onVisitHighlightedLine(node: LineElement) {
            if (
              node.properties.className &&
              node.properties.className.length > 0
            ) {
              node.properties.className.push("line--highlighted");
            } else {
              node.properties.className = ["line--highlighted"];
            }
          },
          onVisitHighlightedChars(node: CharsElement) {
            node.properties.className = ["word--highlighted"];
          },
        },
      ],
      [
        rehypeAutolinkHeadings,
        {
          properties: {
            className: ["anchor"],
          },
        },
      ],
    ],
  },
});