astro/packages/integrations/mdx/README.md

# @astrojs/mdx 📝

This **[Astro integration][astro-integration]** enables the usage of [MDX](https://mdxjs.com/) components and allows you to create pages as `.mdx` files.

- <strong>[Why MDX?](#why-mdx)</strong>
- <strong>[Installation](#installation)</strong>
- <strong>[Usage](#usage)</strong>
- <strong>[Configuration](#configuration)</strong>
- <strong>[Examples](#examples)</strong>
- <strong>[Troubleshooting](#troubleshooting)</strong>
- <strong>[Contributing](#contributing)</strong>
- <strong>[Changelog](#changelog)</strong>

## Why MDX?

MDX allows you to [use variables, JSX expressions and components within Markdown content](https://docs.astro.build/en/guides/markdown-content/#mdx-only-features) in Astro. If you have existing content authored in MDX, this integration allows you to bring those files to your Astro project.

## Installation

### Quick Install

The `astro add` command-line tool automates the installation for you. Run one of the following commands in a new terminal window. (If you aren't sure which package manager you're using, run the first command.) Then, follow the prompts, and type "y" in the terminal (meaning "yes") for each one.

```sh
# Using NPM
npx astro add mdx
# Using Yarn
yarn astro add mdx
# Using PNPM
pnpm astro add mdx
```

If you run into any issues, [feel free to report them to us on GitHub](https://github.com/withastro/astro/issues) and try the manual installation steps below.

### Manual Install

First, install the `@astrojs/mdx` package using your package manager. If you're using npm or aren't sure, run this in the terminal:

```sh
npm install @astrojs/mdx
```

Then, apply this integration to your `astro.config.*` file using the `integrations` property:

**`astro.config.mjs`**

```js
import { defineConfig } from 'astro/config';
import mdx from '@astrojs/mdx';

export default defineConfig({
  // ...
  integrations: [mdx()],
});
```

### Editor Integration

[VS Code](https://code.visualstudio.com/) supports Markdown by default. However, for MDX editor support, you may wish to add the following setting in your VSCode config. This ensures authoring MDX files provides a Markdown-like editor experience.

```json title=".vscode/settings.json"
"files.associations": {
    "*.mdx": "markdown"
}
```

## Usage

With the Astro MDX integration, you can [add MDX pages to your project](/en/guides/markdown-content/#markdown-and-mdx-pages) by adding `.mdx` files within your `src/pages/` directory. You can also [import `.mdx` files](https://docs.astro.build/en/guides/markdown-content/#importing-markdown) into `.astro` files. 

Astro's MDX integration adds extra features to standard MDX, including Markdown-style frontmatter. This allows you to use most of Astro's built-in Markdown features like a [special frontmatter `layout` property](https://docs.astro.build/en/guides/markdown-content/#frontmatter-layout) and a [property for marking a page as a draft](https://docs.astro.build/en/guides/markdown-content/#draft-pages).

See how MDX works in Astro with examples in our [Markdown & MDX guide](https://docs.astro.build/en/guides/markdown-content/).

Visit the [MDX docs](https://mdxjs.com/docs/what-is-mdx/) to learn about using standard MDX features.

## Configuration

Once the MDX integration is installed, no configuration is necessary to use `.mdx` files in your Astro project.

You can extend how your MDX is rendered by adding remark, rehype and recma plugins.

- [`extendPlugins`](#extendplugins)
- [`remarkRehype`](#remarkrehype)
- [`remarkPlugins`](#remarkplugins)
- [`rehypePlugins`](#rehypeplugins)
- [`recmaPlugins`](#recmaplugins)

### `extendPlugins`

You can customize how MDX files inherit your project’s existing Markdown configuration using the `extendPlugins` option.

#### `markdown` (default)

Astro's MDX files will inherit all [`markdown` options](https://docs.astro.build/en/reference/configuration-reference/#markdown-options) in your Astro configuration file, which includes the [GitHub-Flavored Markdown](https://github.com/remarkjs/remark-gfm) and [Smartypants](https://github.com/silvenon/remark-smartypants) plugins by default.

Any additional plugins you apply in your MDX config will be applied *after* your configured Markdown plugins.

#### `astroDefaults`

Astro's MDX files will apply only [Astro's default plugins](/en/reference/configuration-reference/#markdownextenddefaultplugins), without inheriting the rest of your Markdown config. 

This example will apply the default [GitHub-Flavored Markdown](https://github.com/remarkjs/remark-gfm) and [Smartypants](https://github.com/silvenon/remark-smartypants) plugins alongside [`remark-toc`](https://github.com/remarkjs/remark-toc) to your MDX files, while ignoring any `markdown.remarkPlugins` configuration:

```js "extendPlugins: 'astroDefaults'"
// astro.config.mjs
import remarkToc from 'remark-toc';

export default {
  markdown: {
    remarkPlugins: [/** ignored */]
  },
  integrations: [mdx({
    remarkPlugins: [remarkToc],
    // Astro defaults applied
    extendPlugins: 'astroDefaults',
  })],
}
```

#### `false`

Astro's MDX files will not inherit any [`markdown` options](https://docs.astro.build/en/reference/configuration-reference/#markdown-options), nor will any Astro Markdown defaults be applied:

```js "extendPlugins: false"
// astro.config.mjs
import remarkToc from 'remark-toc';

export default {
  integrations: [mdx({
    remarkPlugins: [remarkToc],
    // Astro defaults not applied
    extendPlugins: false,
  })],
}
```

### `remarkRehype`

Markdown content is transformed into HTML through remark-rehype which has [a number of options](https://github.com/remarkjs/remark-rehype#options).

You can set remark-rehype options in your config file:

```js
// astro.config.mjs
export default {
  integrations: [mdx({
    remarkRehype: {
      footnoteLabel: 'Catatan kaki',
      footnoteBackLabel: 'Kembali ke konten',
    },
  })],
};
```
This inherits the configuration of [`markdown.remarkRehype`](https://docs.astro.build/en/reference/configuration-reference/#markdownremarkrehype). This behavior can be changed by configuring `extendPlugins`.

### `remarkPlugins`

Browse [awesome-remark](https://github.com/remarkjs/awesome-remark) for a full curated list of [remark plugins](https://github.com/remarkjs/remark/blob/main/doc/plugins.md) to extend your Markdown's capabilities.

This example applies the [`remark-toc`](https://github.com/remarkjs/remark-toc) plugin to `.mdx` files. To customize plugin inheritance from your Markdown config or Astro's defaults, [see the `extendPlugins` option](#extendplugins).

```js
// astro.config.mjs
import remarkToc from 'remark-toc';

export default {
  integrations: [mdx({
    remarkPlugins: [remarkToc],
  })],
}
```

### `rehypePlugins`

 Browse [awesome-rehype](https://github.com/rehypejs/awesome-rehype) for a full curated list of [Rehype plugins](https://github.com/rehypejs/rehype/blob/main/doc/plugins.md) to transform the HTML that your Markdown generates.

We apply our own (non-removable) [`collect-headings`](https://github.com/withastro/astro/blob/main/packages/integrations/mdx/src/rehype-collect-headings.ts) plugin. This applies IDs to all headings (i.e. `h1 -> h6`) in your MDX files to [link to headings via anchor tags](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/a#linking_to_an_element_on_the_same_page).

This example applies the [`rehype-accessible-emojis`](https://www.npmjs.com/package/rehype-accessible-emojis) plugin to `.mdx` files. To customize plugin inheritance from your Markdown config or Astro's defaults, [see the `extendPlugins` option](#extendplugins).

```js
// astro.config.mjs
import rehypeAccessibleEmojis from 'rehype-accessible-emojis';

export default {
  integrations: [mdx({
    rehypePlugins: [rehypeAccessibleEmojis],
  })],
}
```

### `recmaPlugins`

These are plugins that modify the output [estree](https://github.com/estree/estree) directly. This is useful for modifying or injecting JavaScript variables in your MDX files.

We suggest [using AST Explorer](https://astexplorer.net/) to play with estree outputs, and trying [`estree-util-visit`](https://unifiedjs.com/explore/package/estree-util-visit/) for searching across JavaScript nodes.

## Examples

*   The [Astro MDX starter template](https://github.com/withastro/astro/tree/latest/examples/with-mdx) shows how to use MDX files in your Astro project.

## Troubleshooting

For help, check out the `#support` channel on [Discord](https://astro.build/chat). Our friendly Support Squad members are here to help!

You can also check our [Astro Integration Documentation][astro-integration] for more on integrations.

## Contributing

This package is maintained by Astro's Core team. You're welcome to submit an issue or PR!

## Changelog

See [CHANGELOG.md](https://github.com/withastro/astro/tree/main/packages/integrations/mdx/CHANGELOG.md) for a history of changes to this integration.

[astro-integration]: /en/guides/integrations-guide/

[astro-ui-frameworks]: /en/core-concepts/framework-components/#using-framework-components