components/Card.js

@@ -1,5 +1,5 @@
-import Image from 'next/image'
-import Link from '@/components/Link'
+import Image from './Image'
+import Link from './Link'
 
 const Card = ({ title, description, imgSrc, href }) => (
   <div className="p-4 md:w-1/2 md" style={{ maxWidth: '544px' }}>

components/MDXComponents.js

@@ -1,4 +1,6 @@
-import { MDXRemote } from 'next-mdx-remote'
+/* eslint-disable react/display-name */
+import { useMemo } from 'react'
+import { getMDXComponent } from 'mdx-bundler/client'
 import Image from './Image'
 import CustomLink from './Link'
 import Pre from './Pre'
@@ -7,14 +9,14 @@ export const MDXComponents = {
   Image,
   a: CustomLink,
   pre: Pre,
+  wrapper: ({ components, layout, ...rest }) => {
+    const Layout = require(`../layouts/${layout}`).default
+    return <Layout {...rest} />
+  },
 }
 
 export const MDXLayoutRenderer = ({ layout, mdxSource, ...rest }) => {
-  const LayoutComponent = require(`../layouts/${layout}`).default
+  const MDXLayout = useMemo(() => getMDXComponent(mdxSource), [mdxSource])
 
-  return (
-    <LayoutComponent {...rest}>
-      <MDXRemote {...mdxSource} components={MDXComponents} />
-    </LayoutComponent>
-  )
+  return <MDXLayout layout={layout} components={MDXComponents} {...rest} />
 }

css/tailwind.css

@@ -14,6 +14,19 @@
   @apply hidden;
 }
 
+.code-line {
+  @apply pl-4 -mx-4 border-l-4 border-gray-800;
+}
+
+.highlight-line {
+  @apply -mx-4 bg-gray-700 bg-opacity-50 border-l-4 border-primary-500;
+}
+
+.line-number::before {
+  @apply pr-4 -ml-2 text-gray-400;
+  content: attr(line);
+}
+
 html {
   scroll-behavior: smooth;
 }

data/authors/sparrowhawk.md

@@ -1,6 +1,6 @@
 ---
 name: Sparrow Hawk
-avatar: https://upload.wikimedia.org/wikipedia/commons/thumb/e/e8/Accnis_edit.jpg/220px-Accnis_edit.jpg
+avatar: /static/images/sparrowhawk-avatar.jpg
 occupation: Wizard of Earthsea
 company: Earthsea
 twitter: https://twitter.com/sparrowhawk

data/blog/github-markdown-guide.mdx

@@ -140,6 +140,7 @@ function fancyAlert(arg) {
     $.facebox({ div: '#foo' })
   }
 }
+```
 ````
 
 And here's how it looks - nicely colored with styled code titles!

data/blog/guide-to-using-images-in-nextjs.mdx

@@ -50,14 +50,10 @@ _Note_: If you try to save the image, it is in webp format, if your browser supp
 ![ocean](/static/images/ocean.jpeg)
 
 <p>
-  Photo by{' '}
-  <a href="https://unsplash.com/@yucar?utm_source=unsplash&amp;utm_medium=referral&amp;utm_content=creditCopyText">
-    YUCAR FotoGrafik
-  </a>{' '}
-  on{' '}
-  <a href="https://unsplash.com/s/photos/sea?utm_source=unsplash&amp;utm_medium=referral&amp;utm_content=creditCopyText">
-    Unsplash
-  </a>
+  Photo by [YUCAR
+  FotoGrafik](https://unsplash.com/@yucar?utm_source=unsplash&amp;utm_medium=referral&amp;utm_content=creditCopyText)
+  on
+  [Unsplash](https://unsplash.com/s/photos/sea?utm_source=unsplash&amp;utm_medium=referral&amp;utm_content=creditCopyText)
 </p>
 
 # Benefits

data/blog/new-features-in-v1.mdx

@@ -1,6 +1,6 @@
 ---
 title: 'New features in v1'
-date: '2021-06-02'
+date: '2021-06-29'
 tags: ['next-js', 'tailwind', 'guide']
 draft: false
 summary: 'An overview of the new features released in v1 - code block copy, multiple authors, frontmatter layout and more'
@@ -12,15 +12,17 @@ layout: PostSimple
 A post on the new features introduced in v1.0. New features:
 
 - [Theme colors](#theme-colors)
+- [Xdm MDX compiler](#xdm-mdx-compiler)
 - [Layouts](#layouts)
 - [Multiple authors](#multiple-authors)
 - [Copy button for code blocks](#copy-button-for-code-blocks)
+- [Line highlighting and line numbers](#line-highlighting-and-line-numbers)
 
 ## Theme colors
 
 You can easily modify the theme color by changing the primary attribute in the tailwind config file:
 
-```:tailwind.config.js
+```js:tailwind.config.js
 theme: {
     colors: {
       primary: colors.teal,
@@ -37,6 +39,37 @@ Tailwind includes great default color palettes that can be used for theming your
 
 Migrating from v1? You can revert to the previous theme by setting `primary` to `colors.sky` (Tailwind 2.2.2 and above, otherwise `colors.lightBlue`) and changing gray to `colors.coolGray`.
 
+## Xdm MDX compiler
+
+We switch the MDX bundler from [next-mdx-remote](https://github.com/hashicorp/next-mdx-remote) to [mdx-bundler](https://github.com/kentcdodds/mdx-bundler).
+This uses [xdm](https://github.com/wooorm/xdm) under the hood uses the latest micromark 3 and remark, rehype libraries.
+
+**Warning:** If you were using custom remark or rehype libraries, please upgrade to micromark 3 compatible ones. If you are upgrading, please delete `node_modules` and `package-lock.json` to avoid having past dependencies related issues.
+
+[xdm](https://github.com/wooorm/xdm) contains multiple improvements over [@mdx-js/mdx](https://github.com/mdx-js/mdx), the compiler used internally by next-mdx-remote, but there might be some breaking behaviour changes.
+Please check your markdown output to verify.
+
+Some new possibilities include loading components directly in the mdx file using the import syntax and including js code which could be compiled at the build step.
+
+For example, the following jsx snippet can be used directly in an MDX file to render the page title component:
+
+```js
+import PageTitle from './PageTitle.js'
+
+;<PageTitle> Using JSX components in MDX </PageTitle>
+```
+
+import PageTitle from './PageTitle.js'
+
+<PageTitle> Using JSX components in MDX </PageTitle>
+
+The default configuration resolves all components relative to the `components` directory.
+
+**Note**:
+Components which require external image loaders would require additional esbuild configuration.
+Components which are dependent on global application state on lifecycle like the Nextjs `Link` component would also not work with this setup as each mdx file is built indepedently.
+For such cases, it is better to use component substitution.
+
 ## Layouts
 
 You can map mdx blog content to layout components by configuring the frontmatter field. For example, this post is written with the new `PostSimple` layout!
@@ -110,7 +143,7 @@ Information on authors is now split from `siteMetadata.json` and stored in its o
 
 Here's how an author markdown file might looks like:
 
-```:default.md
+```md:default.md
 ---
 name: Tails Azimuth
 avatar: /static/images/avatar.png
@@ -153,3 +186,46 @@ A demo of a multiple author post is shown in the [Introducing Tailwind Nextjs St
 
 Hover over a code block and you will notice a Github inspired copy button! You can modify `./components/Pre.js` to further customise it.
 The component is passed to `MDXComponents` and modifies all `<pre>` blocks.
+
+## Line highlighting and line numbers
+
+Line highlighting and line numbers is now supported out of the box thanks to the new [rehype-prism-plus plugin](https://github.com/timlrx/rehype-prism-plus)
+
+The following javascript code block:
+
+````
+```js {1, 3-4} showLineNumbers
+var num1, num2, sum
+num1 = prompt('Enter first number')
+num2 = prompt('Enter second number')
+sum = parseInt(num1) + parseInt(num2) // "+" means "add"
+alert('Sum = ' + sum) // "+" means combine into a string
+```
+````
+
+will appear as:
+
+```js {1,3-4} showLineNumbers
+var num1, num2, sum
+num1 = prompt('Enter first number')
+num2 = prompt('Enter second number')
+sum = parseInt(num1) + parseInt(num2) // "+" means "add"
+alert('Sum = ' + sum) // "+" means combine into a string
+```
+
+To modify the styles, change the following class selectors in the `tailwind.css` file:
+
+```css
+.code-line {
+  @apply pl-4 -mx-4 border-l-4 border-gray-800;
+}
+
+.highlight-line {
+  @apply -mx-4 bg-gray-700 bg-opacity-50 border-l-4 border-primary-500;
+}
+
+.line-number::before {
+  @apply pr-4 -ml-2 text-gray-400;
+  content: attr(line);
+}
+```

data/blog/pictures-of-canada.mdx

@@ -59,42 +59,26 @@ When MDX v2 is ready, one could potentially interleave markdown in jsx directly!
 ### Photo Credits
 
 <div>
-  Maple photo by{' '}
-  <a href="https://unsplash.com/@i_am_g?utm_source=unsplash&amp;utm_medium=referral&amp;utm_content=creditCopyText">
-    Guillaume Jaillet
-  </a>{' '}
-  on{' '}
-  <a href="https://unsplash.com/s/photos/canada?utm_source=unsplash&amp;utm_medium=referral&amp;utm_content=creditCopyText">
-    Unsplash
-  </a>
+  Maple photo by [Guillaume
+  Jaillet](https://unsplash.com/@i_am_g?utm_source=unsplash&amp;utm_medium=referral&amp;utm_content=creditCopyText)
+  on
+  [Unsplash](https://unsplash.com/s/photos/canada?utm_source=unsplash&amp;utm_medium=referral&amp;utm_content=creditCopyText)
 </div>
 <div>
-  Mountains photo by{' '}
-  <a href="https://unsplash.com/@john_artifexfilms?utm_source=unsplash&amp;utm_medium=referral&amp;utm_content=creditCopyText">
-    John Lee
-  </a>{' '}
-  on{' '}
-  <a href="https://unsplash.com/s/photos/canada?utm_source=unsplash&amp;utm_medium=referral&amp;utm_content=creditCopyText">
-    Unsplash
-  </a>
+  Mountains photo by [John
+  Lee](https://unsplash.com/@john_artifexfilms?utm_source=unsplash&amp;utm_medium=referral&amp;utm_content=creditCopyText)
+  on
+  [Unsplash](https://unsplash.com/s/photos/canada?utm_source=unsplash&amp;utm_medium=referral&amp;utm_content=creditCopyText)
 </div>
 <div>
-  Lake photo by{' '}
-  <a href="https://unsplash.com/@tjholowaychuk?utm_source=unsplash&amp;utm_medium=referral&amp;utm_content=creditCopyText">
-    Tj Holowaychuk
-  </a>{' '}
-  on{' '}
-  <a href="https://unsplash.com/s/photos/canada?utm_source=unsplash&amp;utm_medium=referral&amp;utm_content=creditCopyText">
-    Unsplash
-  </a>
+  Lake photo by [Tj
+  Holowaychuk](https://unsplash.com/@tjholowaychuk?utm_source=unsplash&amp;utm_medium=referral&amp;utm_content=creditCopyText)
+  on
+  [Unsplash](https://unsplash.com/s/photos/canada?utm_source=unsplash&amp;utm_medium=referral&amp;utm_content=creditCopyText)
 </div>
 <div>
-  Toronto photo by{' '}
-  <a href="https://unsplash.com/@matthewhenry?utm_source=unsplash&amp;utm_medium=referral&amp;utm_content=creditCopyText">
-    Matthew Henry
-  </a>{' '}
-  on{' '}
-  <a href="https://unsplash.com/s/photos/canada?utm_source=unsplash&amp;utm_medium=referral&amp;utm_content=creditCopyText">
-    Unsplash
-  </a>
+  Toronto photo by [Matthew
+  Henry](https://unsplash.com/@matthewhenry?utm_source=unsplash&amp;utm_medium=referral&amp;utm_content=creditCopyText)
+  on
+  [Unsplash](https://unsplash.com/s/photos/canada?utm_source=unsplash&amp;utm_medium=referral&amp;utm_content=creditCopyText)
 </div>

layouts/PostLayout.js

@@ -55,7 +55,7 @@ export default function PostLayout({ frontMatter, authorDetails, next, prev, chi
                     <li className="flex items-center space-x-2" key={author.name}>
                       {author.avatar && (
                         <Image
-                          src={siteMetadata.image}
+                          src={author.avatar}
                           width="38px"
                           height="38px"
                           alt="avatar"

lib/img-to-jsx.js

@@ -15,13 +15,14 @@ module.exports = (options) => (tree) => {
         const dimensions = sizeOf(`${process.cwd()}/public${imageNode.url}`)
 
         // Convert original node to next/image
-        imageNode.type = 'jsx'
-        imageNode.value = `<Image
-          alt={\`${imageNode.alt}\`} 
-          src={\`${imageNode.url}\`}
-          width={${dimensions.width}}
-          height={${dimensions.height}}
-      />`
+        ;(imageNode.type = 'mdxJsxFlowElement'),
+          (imageNode.name = 'Image'),
+          (imageNode.attributes = [
+            { type: 'mdxJsxAttribute', name: 'alt', value: imageNode.alt },
+            { type: 'mdxJsxAttribute', name: 'src', value: imageNode.url },
+            { type: 'mdxJsxAttribute', name: 'width', value: dimensions.width },
+            { type: 'mdxJsxAttribute', name: 'height', value: dimensions.height },
+          ])
 
         // Change node type from p to div to avoid nesting error
         node.type = 'div'

lib/mdx.js

@@ -1,10 +1,10 @@
-import { MDXComponents } from '@/components/MDXComponents'
+import { bundleMDX } from 'mdx-bundler'
 import fs from 'fs'
 import matter from 'gray-matter'
-import { serialize } from 'next-mdx-remote/serialize'
 import path from 'path'
 import readingTime from 'reading-time'
 import visit from 'unist-util-visit'
+import codeTitles from './remark-code-title'
 import imgToJsx from './img-to-jsx'
 import getAllFilesRecursively from './utils/files'
 
@@ -48,21 +48,45 @@ export async function getFileBySlug(type, slug) {
     ? fs.readFileSync(mdxPath, 'utf8')
     : fs.readFileSync(mdPath, 'utf8')
 
-  const { data, content } = matter(source)
-  const mdxSource = await serialize(content, {
-    components: MDXComponents,
-    mdxOptions: {
-      remarkPlugins: [
+  // https://github.com/kentcdodds/mdx-bundler#nextjs-esbuild-enoent
+  if (process.platform === 'win32') {
+    process.env.ESBUILD_BINARY_PATH = path.join(
+      process.cwd(),
+      'node_modules',
+      'esbuild',
+      'esbuild.exe'
+    )
+  } else {
+    process.env.ESBUILD_BINARY_PATH = path.join(
+      process.cwd(),
+      'node_modules',
+      'esbuild',
+      'bin',
+      'esbuild'
+    )
+  }
+
+  const { frontmatter, code } = await bundleMDX(source, {
+    // mdx imports can be automatically source from the components directory
+    cwd: path.join(process.cwd(), 'components'),
+    xdmOptions(options) {
+      // this is the recommended way to add custom remark/rehype plugins:
+      // The syntax might look weird, but it protects you in case we add/remove
+      // plugins in the future.
+      options.remarkPlugins = [
+        ...(options.remarkPlugins ?? []),
         require('remark-slug'),
         require('remark-autolink-headings'),
-        require('remark-code-titles'),
+        require('remark-gfm'),
+        codeTitles,
+        [require('remark-footnotes'), { inlineNotes: true }],
         require('remark-math'),
         imgToJsx,
-      ],
-      inlineNotes: true,
-      rehypePlugins: [
+      ]
+      options.rehypePlugins = [
+        ...(options.rehypePlugins ?? []),
         require('rehype-katex'),
-        require('@mapbox/rehype-prism'),
+        [require('rehype-prism-plus'), { ignoreMissing: true }],
         () => {
           return (tree) => {
             visit(tree, 'element', (node, index, parent) => {
@@ -73,17 +97,25 @@ export async function getFileBySlug(type, slug) {
             })
           }
         },
-      ],
+      ]
+      return options
+    },
+    esbuildOptions: (options) => {
+      options.loader = {
+        ...options.loader,
+        '.js': 'jsx',
+      }
+      return options
     },
   })
 
   return {
-    mdxSource,
+    mdxSource: code,
     frontMatter: {
-      readingTime: readingTime(content),
+      readingTime: readingTime(code),
       slug: slug || null,
       fileName: fs.existsSync(mdxPath) ? `${slug}.mdx` : `${slug}.md`,
-      ...data,
+      ...frontmatter,
     },
   }
 }

lib/remark-code-title.js

@@ -0,0 +1,32 @@
+import visit from 'unist-util-visit'
+
+module.exports = function (options) {
+  return (tree) =>
+    visit(tree, 'code', (node, index) => {
+      const nodeLang = node.lang || ''
+      let language = ''
+      let title = ''
+
+      if (nodeLang.includes(':')) {
+        language = nodeLang.slice(0, nodeLang.search(':'))
+        title = nodeLang.slice(nodeLang.search(':') + 1, nodeLang.length)
+      }
+
+      if (!title) {
+        return
+      }
+
+      const className = 'remark-code-title'
+
+      const titleNode = {
+        type: 'mdxJsxFlowElement',
+        name: 'div',
+        attributes: [{ type: 'mdxJsxAttribute', name: 'className', value: className }],
+        children: [{ type: 'text', value: title }],
+        data: { _xdmExplicitJsx: true },
+      }
+
+      tree.children.splice(index, 0, titleNode)
+      node.lang = language
+    })
+}

package.json

@@ -12,25 +12,25 @@
     "prepare": "husky install"
   },
   "dependencies": {
-    "@mapbox/rehype-prism": "^0.6.0",
     "@tailwindcss/forms": "^0.3.2",
     "@tailwindcss/typography": "^0.4.0",
     "autoprefixer": "^10.2.5",
     "gray-matter": "^4.0.2",
     "image-size": "1.0.0",
+    "mdx-bundler": "^4.1.0",
     "next": "11.0.1",
-    "next-mdx-remote": "^3.0.1",
     "next-themes": "^0.0.14",
     "postcss": "^8.3.5",
     "preact": "^10.5.13",
     "react": "17.0.2",
     "react-dom": "17.0.2",
     "reading-time": "1.3.0",
-    "rehype-katex": "^4.0.0",
+    "rehype-katex": "^5.0.0",
+    "rehype-prism-plus": "0.0.1",
     "remark-autolink-headings": "6.0.1",
-    "remark-code-titles": "0.1.2",
     "remark-footnotes": "^3.0.0",
-    "remark-math": "^3.0.1",
+    "remark-gfm": "^1.0.0",
+    "remark-math": "^4.0.0",
     "remark-slug": "6.0.0",
     "tailwindcss": "^2.2.2"
   },

pages/projects.js

@@ -1,6 +1,6 @@
-import Image from 'next/image'
 import siteMetadata from '@/data/siteMetadata'
 import projectsData from '@/data/projectsData'
+import Image from '@/components/Image'
 import Link from '@/components/Link'
 import Card from '@/components/Card'
 import { PageSeo } from '@/components/SEO'