micromark-extension-gfm

micromark extension to support GitHub flavored markdown (GFM).

Contents

• What is this?
• When to use this
• Install
• Use
• API
  • gfm(options?)
  • gfmHtml(htmlOptions?)
• Types
• Compatibility
• Security
• Related
• Contribute
• License

What is this?

This package is a micromark extension to add support for all GFM features: autolink literals, footnotes, strikethrough, tables, tagfilter, and tasklists.

When to use this

You probably should use this package if you use micromark and want to enable GFM. When working with syntax trees, you’d want to combine this package with mdast-util-gfm.

You can also use the underlying features separately:

• micromark/micromark-extension-gfm-autolink-literal — support GFM autolink literals
• micromark/micromark-extension-gfm-footnote — support GFM footnotes
• micromark/micromark-extension-gfm-strikethrough — support GFM strikethrough
• micromark/micromark-extension-gfm-table — support GFM tables
• micromark/micromark-extension-gfm-tagfilter — support GFM tagfilter
• micromark/micromark-extension-gfm-task-list-item — support GFM tasklists

These tools are all rather low-level. In most cases, you’d instead want to use remark-gfm with remark.

Install

This package is ESM only. In Node.js (version 12.20+, 14.14+, or 16.0+), install with npm:

npm install micromark-extension-gfm

In Deno with Skypack:

import {gfm, gfmHtml} from 'https://cdn.skypack.dev/micromark-extension-gfm@2?dts'

In browsers with Skypack:

<script type="module">
  import {gfm, gfmHtml} from 'https://cdn.skypack.dev/micromark-extension-gfm@2?min'
</script>

Use

Say we have the following file example.md:

# GFM

## Autolink literals

www.example.com, https://example.com, and [email protected].

## Footnote

A note[^1]

[^1]: Big note.

## Strikethrough

~one~ or ~~two~~ tildes.

## Table

| a | b  |  c |  d  |
| - | :- | -: | :-: |

## Tag filter

<plaintext>

## Tasklist

* [ ] to do
* [x] done

And our module example.js looks as follows:

import fs from 'node:fs'
import {micromark} from 'micromark'
import {gfm, gfmHtml} from 'micromark-extension-gfm'

const output = micromark(fs.readFileSync('example.md'), {
  allowDangerousHtml: true,
  extensions: [gfm()],
  htmlExtensions: [gfmHtml()]
})

console.log(output)

Now, running node example yields:

<h1>GFM</h1>
<h2>Autolink literals</h2>
<p><a href="http://www.example.com">www.example.com</a>, <a href="https://example.com">https://example.com</a>, and <a href="mailto:[email protected]">[email protected]</a>.</p>
<h2>Footnote</h2>
<p>A note<sup><a href="#user-content-fn-1" id="user-content-fnref-1" data-footnote-ref="" aria-describedby="footnote-label">1</a></sup></p>
<h2>Strikethrough</h2>
<p><del>one</del> or <del>two</del> tildes.</p>
<h2>Table</h2>
<table>
<thead>
<tr>
<th>a</th>
<th align="left">b</th>
<th align="right">c</th>
<th align="center">d</th>
</tr>
</thead>
</table>
<h2>Tag filter</h2>
&lt;plaintext>
<h2>Tasklist</h2>
<ul>
<li><input type="checkbox" disabled="" /> to do</li>
<li><input type="checkbox" disabled="" checked="" /> done</li>
</ul>
<section data-footnotes="" class="footnotes"><h2 id="footnote-label" class="sr-only">Footnotes</h2>
<ol>
<li id="user-content-fn-1">
<p>Big note. <a href="#user-content-fnref-1" data-footnote-backref="" class="data-footnote-backref" aria-label="Back to content">↩</a></p>
</li>
</ol>
</section>

API

This package exports the following identifiers: gfm, gfmHtml. There is no default export.

This extensions supports the endorsed development condition. Run node --conditions development module.js to get instrumented dev code. Without this condition, production code is loaded.

gfm(options?)

A function that can be called to get an extension for micromark to parse GFM (can be passed in extensions).

options

Configuration (optional).

options.singleTilde

Whether to support strikethrough with a single tilde (boolean, default: true). Single tildes work on github.com, but are technically prohibited by GFM. Passed as singleTilde in micromark-extension-gfm-strikethrough.

gfmHtml(htmlOptions?)

A function that can be called to get an extension to compile GFM to HTML (can be passed in htmlExtensions).

htmlOptions

Configuration (optional).

htmlOptions.clobberPrefix

Prefix to use before the id attribute to prevent it from clobbering attributes (string, default: 'user-content-'). Passed as clobberPrefix in micromark-extension-gfm-footnote.

htmlOptions.label

Label to use for the footnotes section (string, default: 'Footnotes'). Passed as label in micromark-extension-gfm-footnote.

htmlOptions.backLabel

Label to use from backreferences back to their footnote call (string, default: 'Back to content'). Passed as backLabel in micromark-extension-gfm-footnote.

Types

This package is fully typed with TypeScript. It exports additional Options and HtmlOptions types that model their respective interfaces.

Compatibility

This package is at least compatible with all maintained versions of Node.js. As of now, that is Node.js 12.20+, 14.14+, and 16.0+. It also works in Deno and modern browsers.

Security

This package is safe by default.

Related

• syntax-tree/mdast-util-gfm — support GFM in mdast
• remarkjs/remark-gfm — support GFM in remark
• micromark/micromark-extension-gfm-autolink-literal — support GFM autolink literals
• micromark/micromark-extension-gfm-footnote — support GFM footnotes
• micromark/micromark-extension-gfm-strikethrough — support GFM strikethrough
• micromark/micromark-extension-gfm-table — support GFM tables
• micromark/micromark-extension-gfm-tagfilter — support GFM tagfilter
• micromark/micromark-extension-gfm-task-list-item — support GFM tasklists

Contribute

See contributing.md in micromark/.github for ways to get started. See support.md for ways to get help.

This project has a code of conduct. By interacting with this repository, organization, or community you agree to abide by its terms.

License

MIT © Titus Wormer