Remark TS to JS

A remark plugin to transform TypeScript codeblocks into two tabs of codeblock with its JavaScript variant.

Usage

Install dependencies:

npm i fumadocs-docgen oxc-transform

For Next.js, externalize oxc-transform:

next.config.mjs (Next.js)

import { createMDX } from 'fumadocs-mdx/next';

/** @type {import('next').NextConfig} */
const config = {
  reactStrictMode: true,
  serverExternalPackages: ['oxc-transform'],
};

const withMDX = createMDX();

export default withMDX(config);

Add the remark plugin:

source.config.ts

import { remarkTypeScriptToJavaScript } from 'fumadocs-docgen/remark-ts2js';
import { defineConfig } from 'fumadocs-mdx/config';

export default defineConfig({
  mdxOptions: {
    remarkPlugins: [remarkTypeScriptToJavaScript],
  },
});

Finally, make sure to define the required MDX components: Tabs and Tab.

components/mdx.tsx (Fumadocs UI)

import { Tab, Tabs } from 'fumadocs-ui/components/tabs';
import defaultComponents from 'fumadocs-ui/mdx';
import type { MDXComponents } from 'mdx/types';

export function getMDXComponents(components?: MDXComponents) {
  return {
    ...defaultComponents,
    Tab,
    Tabs,
    ...components,
  } satisfies MDXComponents;
}

You can now enable it on TypeScript/TSX codeblocks, like:

```tsx ts2js
import { ReactNode } from 'react';

export default function Layout({ children }: { children: ReactNode }) {
  return <div>{children}</div>;
}
```

import { ReactNode } from 'react';

export default function Layout({ children }: { children: ReactNode }) {
  return <div>{children}</div>;
}

Usage

On this page