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rehype-mdx-fenced-code-meta-support

v1.0.4

Published

A rehype MDX plugin for interpreting meta data tags passed to fenced code blocks in mdx.

Downloads

1,117

Readme

A rehype MDX plugin for adding metadata to code elements.

Table of Contents

Why

With the latest version of mdx-js, random props could not be fetched if they were in format below -

```mdx path=google.com src=no-src
# Heading 1
```

This was working in mdx v1. This package adds a new prop named metaData for the fenced code blocks of the format path=google.com src=no-src which can be parsed using a regex and accessed in your custom code component.

Installation

npm install rehype-mdx-fenced-code-meta-support

OR

yarn add rehype-mdx-fenced-code-meta-support

Usage

This plugin adds metadata to code elements in the MDX.

For example, given a file named example.mdx with the following content:

```mdx path=google.com src=no-src
# Heading 1
```

The <code /> element now has a metaData prop containing the path=google.com src=no-src of the code block.

We are using this in gatsby with gatsby-plugin-mdx plugin like this:

...
import rehypeAddCodeMetaData from 'rehype-mdx-fenced-code-meta-support';
...
 {
        resolve: `gatsby-plugin-mdx`,
        options: {
          mdxOptions: {
            rehypePlugins: [rehypeAddCodeMetaData],
          },
        },
},
import React from 'react';
import { MDXProvider as Provider } from '@mdx-js/react';
const components = {
  code: (props) => {
    console.log("props", props);
    const metaDataObject = props.metaData.split(' ').reduce((obj, item) => {
        const [key, value] = item.split('=');
        obj[key] = value;
        return obj;
      }, {});

    return <Code {...props} path={metaDataObject.path} src={metaDataObject.src} />;
  },
}

const MDXProvider = ({ components = components, element }) => (
  <Provider components={{ ...components }}>
    {element}
  </Provider>
);

export default MDXProvider;

API

This package has a default export rehypeAddCodeMetaData.

rehypeAddCodeMetaData

An MDX rehype plugin for adding metadata to code elements.

Compatibility

This plugin works with Node.js 16 or greater and MDX 3.

License

MIT © Mudit Juneja