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★ 41 Open GitHub ↗

ReadMe's flavored Markdown parser and React-based rendering engine.

// repository documentation

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ReadMe's MDX rendering engine and custom component collection. 
 
 Use ReadMe? <a href="https://docs.readme.com/rdmd/page/mdx-engine">Learn more about our upcoming move to MDX!</a>

## Usage

To use the engine, install it from NPM:

```
npm install --save @readme/markdown
```

Then [`compile`](#compile) and [`run`](#run) your MDX:

```jsx
import RMDX from '@readme/markdown';

export default ({ body }) => <div className="markdown-body">{RMDX.run(RMDX.compile(body))}</div>;
```

## API

### `compile`

Compiles MDX to JS. Essentially a wrapper around [`mdx.compile`](https://mdxjs.com/packages/mdx/#compilefile-options). Used before calling [`run`](#run); it has been left as a seperate method for potential caching opportunities.

#### Parameters

- **`string`** (`string`)—an MDX document
- **`opts`** ([`CompileOpts`](#compileopts), optional)—a configuration object

#### Returns

A string of compiled Javascript module code.

### `run`

> [!CAUTION]
> This is essentially a wrapper around [`mdx.run`](https://mdxjs.com/packages/mdx/#runcode-options) and **it will `eval` the compiled MDX**. Make sure you only call `run` on safe syntax from a trusted author!

#### Parameters

- **`string`** (`string`)—a compiled mdx document
- **`opts`** (`RunOpts`, optional)—configuration

#### Returns

An [`RMDXModule`](#rmdxmodule) of renderable components.

### `mdx`

Compiles an AST to a string of MDX syntax.

#### Parameters

- **`tree`** (`object`)—an abstract syntax tree
- **`opts`** ([`Options`](https://github.com/remarkjs/remark/tree/main/packages/remark-stringify#options '`remark-stringify` Options type'))—`remark-stringify` configuration.

#### Returns

An MDX string.

### Other Methods

- **`mdast`**: parse MDX syntax to MDAST.
- **`hast`**: parse MDX syntax to HAST.
- **`plain`**: parse MDX to a plaintext string with all Markdown syntax removed. (This _does not_ `eval` the doc.)
- **`tags`**: get a list of tag names from the doc. (This _does not_ `eval` the doc.)
- **`utils`**: additional defaults, helper methods, components, and so on.

## Types

### `CompileOpts`

Extends [`CompileOptions`](https://mdxjs.com/packages/mdx/#compileoptions)

##### Additional Properties

- **`lazyImages`** (`boolean`, optional)—load images lazily
- **`safeMode`** (`boolean`, optional)—extract script tags from `HTMLBlock`s
- **`components`** (`Record<string, string>`, optional)—an object of tag names to mdx.
- **`copyButtons`** (`Boolean`, optional) — add a copy button to code blocks

### `RunOpts`

Extends [`RunOptions`](https://mdxjs.com/packages/mdx/#runoptions)

##### Additional Properties

- **`components`** (`Record<string, MDXModule>`, optional)—a set of custom MDX components
- **`imports`** (`Record<string, unknown>`, optional)—an set of modules to import globally
- **`terms`** (`GlossaryTerm[]`, optional)
- **`variables`** (`Variables`, optional)—an object containing [user variables](https://github.com/readmeio/variable)

### `RMDXModule`

##### Properties

- **`default`** (`() => MDXContent`)—the MDX douments default export
- **`toc`** (`HastHeading[]`)—a list of headings in the document
- **`Toc`** (`() => MDCContent`)—a table of contents component

## Local development and testing

To make changes to the RDMD engine locally, run the local development server. Clone the repo, `cd` in to it, `npm install`, and `npm run start`!

If you make changes to the docs or how the markdown is rendered, you may need to update the visual regression snapshots by running `make updateSnapshot`. Running these browser tests requires `docker`. Follow the docker [install instructions for mac](https://docs.docker.com/docker-for-mac/install/). You may want to increase the [memory usage](https://docs.docker.com/docker-for-mac/#resources). If you have not already, you'll need to create an account for `docker hub` and [sign-in locally](https://docs.docker.com/docker-for-mac/#docker-hub).

### Linking Changes to the Main Repo

To test local changes in the main readme app, use `npm pack` (not `npm link`) and clear the webpack cache:

**In this repo, run:**

```
npm ci && npm run build
```

**In the main app repo:**

Add to `.env`:

```
MARKDOWN_DIR={{path to local markdown repo}}
```

Run:

```
make link-markdown && rm -rf webpack-cache && make webpack && make start
```

> **Note:** You must clear `webpack-cache` after every reinstall or the app will serve the old version.

### Linking Changes to Storybook

`npm link` works with the storybook app:

**In this repo, run:**

```
npm link && npm run watch
```

**In the main app repo, run:**

```
npm link $PATH_TO_LOCAL_MARKDOWN_REPO
```

## Releases

First, update `main` with what’s on `next`:

```
git switch next
git pull
git switch main
git pull
git merge --no-ff next
git push
```

WAIT until the build is finished, then update `next`:

```
git pull
git switch next
git merge main
git push
```

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