mdxlite

A minimal MDX runtime for constrained environments, e.g. Cloudflare Workers.

@mdx-js/mdx usage during runtime requires use of eval (evaluate and evaluateSync) in order to transform and run mdx, unfortunately not all environments allow for use of eval - like Cloudflare Workers.

mdxlite works similar to @mdx-js/mdx, in that you can take a string of markdown with JSX and transform it, yet does so without using eval or new Function()!

Getting Started:

bun add mdxlite

Usage:

import { transformMarkdown } from 'mdxlite';

async function AsyncMarkdown({ children }): Promise<ReactNode> {
  return await transformMarkdown({
    markdown: children
    // You can also provide custom components here:
    components: {
      Greeting({children}) {
        return <marquee>{children}</marquee>
      }
    },
    // as well as any imports that might occur within the MDX string
    // **ALL** imports within the markdown string __must__ be provided here
    imports: {
      './foo': {
        namedExport: true,
        default: function DefaultExport() {
          return 'something';
        }
      }
    }
  });
}

async function handleRequest() {

  let markdownString = `
# Hello World!

import Foo, {namedExport} from './foo';

<Foo />

export const message = "hi there!"

{namedExport ? message : '🥷'}
`.trim();

  let body = await renderToReadableStream(
    <AsyncMarkdown>{markdownString}</AsyncMarkdown>
  )
  return new Response(
    body,
    {
      headers: {
        'Content-Type': 'text/html'
      }
    }
  );
}

Credits:

This package was heavily inspired by, and uses most of the same code as the react-markdown package, and generally wouldn't be possible without many packages in the unifiedjs ecosystem.

Contributing:

Building:

This library uses swc and TypeScript to build the source code and generate types.

To build the library, run bun run build from the root, or from this workspace!

Code Quality:

Type Checking:

This library uses TypeScript to perform type checks, run bun run type-check from the root or from this workspace!

Linting

This library uses BiomeJS for linting, run bun run lint from the root or from this workspace!

Tests

This library uses Bun for running unit tests, run bun run test from the root or from this workspace!

Publishing:

To publish the library, run bun run pub from the workspace root. This will prompt you to login to npm and publish the package.

Note: In the future, we will automate this process using GitHub Actions. And also add in tooling to manage releases / changelogs!