micromark-extension-gfm
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micromark extensions to support GitHub flavored markdown (GFM).
Contents
What is this?
This package contains extensions that add support for all features enabled by
GFM to micromark
.
It supports autolink literals, footnotes, strikethrough, tables, tagfilter, and
tasklists.
When to use this
This project is useful when you want to support GFM in markdown.
You can use these extensions when you are working with micromark
.
Alternatively, you can also use the underlying features separately:
When you need a syntax tree, combine this package with
mdast-util-gfm
.
All these packages are used in remark-gfm
, which focusses on
making it easier to transform content by abstracting these internals away.
Install
This package is ESM only.
In Node.js (version 16+), install with npm:
npm install micromark-extension-gfm
In Deno with esm.sh
:
import {gfm, gfmHtml} from 'https://esm.sh/micromark-extension-gfm@2'
In browsers with esm.sh
:
<script type="module">
import {gfm, gfmHtml} from 'https://esm.sh/micromark-extension-gfm@2?bundle'
</script>
Use
Say our document example.md
contains:
# GFM
## Autolink literals
www.example.com, https://example.com, and contact@example.com.
## 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/promises'
import {micromark} from 'micromark'
import {gfm, gfmHtml} from 'micromark-extension-gfm'
const output = micromark(await fs.readFile('example.md'), {
allowDangerousHtml: true,
extensions: [gfm()],
htmlExtensions: [gfmHtml()]
})
console.log(output)
…now running node example.js
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:contact@example.com">contact@example.com</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>
<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 identifiers gfm
and
gfmHtml
.
There is no default export.
The separate extensions support the development
condition.
Run node --conditions development module.js
to get instrumented dev code.
Without this condition, production code is loaded.
gfm(options?)
Create an extension for micromark
to enable GFM syntax.
Parameters
Returns
Extension for micromark
that can be passed in extensions
to enable GFM
syntax (Extension
).
gfmHtml(options?)
Create an extension for micromark
to support GFM when serializing to HTML.
Parameters
Returns
Extension for micromark
that can be passed in htmlExtensions
to support GFM
when serializing to HTML (HtmlExtension
).
Options
Configuration for syntax (TypeScript type).
Type
export type {Options} from 'micromark-extension-gfm-strikethrough'
See Options
.
HtmlOptions
Configuration for HTML (TypeScript type).
Type
export type {HtmlOptions} from 'micromark-extension-gfm-footnote'
See HtmlOptions
.
Bugs
For bugs present in GFM but not here, or other peculiarities that are
supported, see each corresponding readme:
Authoring
For recommendations on how to author GFM, see each corresponding readme:
HTML
For info on what HTML features GFM relates to, see each corresponding readme:
CSS
For info on how GitHub styles these features, see each corresponding readme:
Syntax
For info on the syntax of these features, see each corresponding readme:
Types
This package is fully typed with TypeScript.
It exports the additional types HtmlOptions
and
Options
.
Compatibility
Projects maintained by the unified collective are compatible with all maintained
versions of Node.js.
As of now, that is Node.js 16+.
Our projects sometimes work with older versions, but this is not guaranteed.
These extensions work with micromark
version 3+.
Security
This package is safe.
Setting clobberPrefix = ''
is dangerous, it opens you up to DOM clobbering.
The labelTagName
and labelAttributes
options are unsafe when used with user
content, they allow defining arbitrary HTML.
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