micromark-extension-gfm

What is micromark-extension-gfm?

The micromark-extension-gfm npm package is an extension for the micromark Markdown parser that adds support for GitHub Flavored Markdown (GFM). This extension enables users to parse and render Markdown text according to the specifications of GFM, which includes several GitHub-specific features such as tables, task lists, and strikethrough.

What are micromark-extension-gfm's main functionalities?

Tables

This feature allows the parsing of tables in Markdown formatted text. The code sample demonstrates how to convert a simple Markdown table into HTML using the micromark parser with the gfmTable extension.

import {micromark} from 'micromark';
import {gfmTable} from 'micromark-extension-gfm-table';

const markdown = '| Header 1 | Header 2 |\n| -------- | -------- |\n| Cell 1   | Cell 2   |';
const html = micromark(markdown, {extensions: [gfmTable()]});
console.log(html);

Task Lists

This feature supports the rendering of task lists, where tasks can be marked as completed or incomplete. The code sample shows how to convert Markdown task list items into HTML.

import {micromark} from 'micromark';
import {gfmTaskListItem} from 'micromark-extension-gfm-task-list-item';

const markdown = '- [x] Completed task\n- [ ] Incomplete task';
const html = micromark(markdown, {extensions: [gfmTaskListItem()]});
console.log(html);

Strikethrough

This feature enables the use of strikethrough text formatting in Markdown. The code sample illustrates how to parse and convert strikethrough text from Markdown to HTML.

import {micromark} from 'micromark';
import {gfmStrikethrough} from 'micromark-extension-gfm-strikethrough';

const markdown = 'This is ~~strikethrough~~ text.';
const html = micromark(markdown, {extensions: [gfmStrikethrough()]});
console.log(html);

Other packages similar to micromark-extension-gfm

remark-gfm

remark-gfm is another npm package that provides support for GitHub Flavored Markdown. It is built on top of the remark Markdown processor and is similar to micromark-extension-gfm in functionality but uses a different underlying Markdown parsing library.

markdown-it

markdown-it is a Markdown parser that can be extended with plugins, including those for GFM features. It is similar to micromark-extension-gfm but offers a different API and plugin ecosystem, potentially providing more customization options for users.

README

micromark-extension-gfm

micromark extension to support GitHub flavored markdown. This extension matches either the GFM spec or github.com (default).

This package provides the low-level modules for integrating with the micromark tokenizer and the micromark HTML compiler.

When to use this

If you’re using micromark or mdast-util-from-markdown, use this package. Alternatively, if you’re using remark, use remark-gfm.

If you don’t need all of GFM, the extensions can be used 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

Install

This package is ESM only: Node 12+ is needed to use it and it must be imported instead of required.

npm:

npm install micromark-extension-gfm

Use

Say we have the following file, example.md:

# GFM

## Autolink literals

www.example.com, https://example.com, and [e-mail].

## 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:[e-mail]">[e-mail]</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 disabled="" type="checkbox"> to do</li>
<li><input checked="" disabled="" type="checkbox"> 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.

gfm(options?)

gfmHtml

Support GFM or markdown on github.com. gfm is a function that can be called with options and returns an extension for micromark to parse GFM (can be passed in extensions). gfmHtml is a function that can be called and returns an extension for micromark to compile as elements (can be passed in htmlExtensions).

options

options.singleTilde

Passed as singleTilde in micromark-extension-gfm-strikethrough.

Related

• remarkjs/remark — markdown processor powered by plugins
• syntax-tree/mdast-util-gfm — mdast utility to support GFM
• syntax-tree/mdast-util-from-markdown — mdast parser using micromark to create mdast from markdown
• syntax-tree/mdast-util-to-markdown — mdast serializer to create markdown from mdast
• micromark/micromark — the smallest commonmark-compliant markdown parser that exists
• 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