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https://github.com/remarkjs/remark-gfm

remark plugin to support GFM (autolink literals, footnotes, strikethrough, tables, tasklists)
https://github.com/remarkjs/remark-gfm
autolink gfm github remark remark-plugin strikethrough table tasklist
Last synced: 26 days ago
JSON representation
remark plugin to support GFM (autolink literals, footnotes, strikethrough, tables, tasklists)
Host: GitHub
URL: https://github.com/remarkjs/remark-gfm
Owner: remarkjs
License: mit
Created: 2020-10-04T09:42:34.000Z (about 4 years ago)
Default Branch: main
Last Pushed: 2023-09-18T10:52:11.000Z (about 1 year ago)
Last Synced: 2024-05-22T08:44:17.779Z (7 months ago)
Topics: autolink, gfm, github, remark, remark-plugin, strikethrough, table, tasklist
Language: JavaScript
Homepage: https://remark.js.org
Size: 121 KB
Stars: 633
Watchers: 10
Forks: 22
Open Issues: 0
Metadata Files:
- Readme: readme.md
- License: license
Awesome Lists containing this project

awesome-remark - remark-gfm - Support GitHub Flavored Markdown (GFM). (Plugins)
README

        # remark-gfm

[![Build][build-badge]][build]

[![Coverage][coverage-badge]][coverage]

[![Downloads][downloads-badge]][downloads]

[![Size][size-badge]][size]

[![Sponsors][sponsors-badge]][collective]

[![Backers][backers-badge]][collective]

[![Chat][chat-badge]][chat]

**[remark][]** plugin to support [GFM][] (autolink literals, footnotes,

strikethrough, tables, tasklists).

## Contents

*   [What is this?](#what-is-this)

*   [When should I use this?](#when-should-i-use-this)

*   [Install](#install)

*   [Use](#use)

*   [API](#api)

    *   [`unified().use(remarkGfm[, options])`](#unifieduseremarkgfm-options)

    *   [`Options`](#options)

*   [Examples](#examples)

    *   [Example: `singleTilde`](#example-singletilde)

    *   [Example: `stringLength`](#example-stringlength)

*   [Bugs](#bugs)

*   [Authoring](#authoring)

*   [HTML](#html)

*   [CSS](#css)

*   [Syntax](#syntax)

*   [Syntax tree](#syntax-tree)

*   [Types](#types)

*   [Compatibility](#compatibility)

*   [Security](#security)

*   [Related](#related)

*   [Contribute](#contribute)

*   [License](#license)

## What is this?

This package is a [unified][] ([remark][]) plugin to enable the extensions to

markdown that GitHub adds with GFM: autolink literals (`www.x.com`), footnotes

(`[^1]`), strikethrough (`~~stuff~~`), tables (`| cell |…`), and tasklists

(`* [x]`).

You can use this plugin to add support for parsing and serializing them.

These extensions by GitHub to CommonMark are called [GFM][] (GitHub Flavored

Markdown).

This plugin does not handle how markdown is turned to HTML.

That’s done by [`remark-rehype`][remark-rehype].

If your content is not in English and uses footnotes, you should configure that

plugin.

When generating HTML, you might also want to enable [`rehype-slug`][rehype-slug]

to add `id`s on headings.

A different plugin, [`remark-frontmatter`][remark-frontmatter], adds support for

frontmatter.

GitHub supports YAML frontmatter for files in repos and Gists but they don’t

treat it as part of GFM.

Another plugin, [`remark-github`][remark-github], adds support for how markdown

works in relation to a certain GitHub repo in comments, issues, PRs, and

releases, by linking references to commits, issues, and users.

Yet another plugin, [`remark-breaks`][remark-breaks], turns soft line endings

(enters) into hard breaks (`
`s).

GitHub does this in a few places (comments, issues, PRs, and releases).

## When should I use this?

This project is useful when you want to support the same features that GitHub

does in files in a repo, Gists, and several other places.

Users frequently believe that some of these extensions, specifically autolink

literals and tables, are part of normal markdown, so using `remark-gfm` will

help match your implementation to their understanding of markdown.

There are several edge cases where GitHub’s implementation works in unexpected

ways or even different than described in their spec, so *writing* in GFM is not

always the best choice.

If you *just* want to turn markdown into HTML (with maybe a few extensions such

as GFM), we recommend [`micromark`][micromark] with

[`micromark-extension-gfm`][micromark-extension-gfm] instead.

If you don’t use plugins and want to access the syntax tree, you can use

[`mdast-util-from-markdown`][mdast-util-from-markdown] with

[`mdast-util-gfm`][mdast-util-gfm].

## Install

This package is [ESM only][esm].

In Node.js (version 16+), install with [npm][]:

```sh

npm install remark-gfm

```

In Deno with [`esm.sh`][esmsh]:

```js

import remarkGfm from 'https://esm.sh/remark-gfm@4'

```

In browsers with [`esm.sh`][esmsh]:

```html

  import remarkGfm from 'https://esm.sh/remark-gfm@4?bundle'

```

## Use

Say our document `example.md` contains:

```markdown

# 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  |

| - | :- | -: | :-: |

## Tasklist

* [ ] to do

* [x] done

```

…and our module `example.js` contains:

```js

import rehypeStringify from 'rehype-stringify'

import remarkGfm from 'remark-gfm'

import remarkParse from 'remark-parse'

import remarkRehype from 'remark-rehype'

import {read} from 'to-vfile'

import {unified} from 'unified'

const file = await unified()

  .use(remarkParse)

  .use(remarkGfm)

  .use(remarkRehype)

  .use(rehypeStringify)

  .process(await read('example.md'))

console.log(String(file))

```

…then running `node example.js` yields:

```html

GFM

Autolink literals

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

Footnote

A note¹

Strikethrough

one or two tildes.

Table


a

b

c

d

Tasklist



 to do

 done



Footnotes





Big note. ↩





```

## API

This package exports no identifiers.

The default export is [`remarkGfm`][api-remark-gfm].

### `unified().use(remarkGfm[, options])`

Add support GFM (autolink literals, footnotes, strikethrough, tables,

tasklists).

###### Parameters

*   `options` ([`Options`][api-options], optional)

    — configuration

###### Returns

Nothing (`undefined`).

### `Options`

Configuration (TypeScript type).

###### Fields

*   `stringLength` (`((value: string) => number)`, default: `d => d.length`)

    — detect the size of table cells, used when aligning cells

*   `singleTilde` (`boolean`, default: `true`)

    — whether to support strikethrough with a single tilde;

    single tildes work on github.com, but are technically prohibited by GFM;

    you can always use 2 or more tildes for strikethrough

*   `tablePipeAlign` (`boolean`, default: `true`)

    — whether to align table pipes

*   `tableCellPadding` (`boolean`, default: `true`)

    — whether to add a space of padding between table pipes and cells

## Examples

### Example: `singleTilde`

To turn off support for parsing strikethrough with single tildes, pass

`singleTilde: false`:

```js

// …

const file = await unified()

  .use(remarkParse)

  .use(remarkGfm, {singleTilde: false})

  .use(remarkRehype)

  .use(rehypeStringify)

  .process('~one~ and ~~two~~')

console.log(String(file))

```

Yields:

```html

~one~ and two

```

### Example: `stringLength`

It’s possible to align tables based on the visual width of cells.

First, let’s show the problem:

```js

import {remark} from 'remark'

import remarkGfm from 'remark-gfm'

const input = `| Alpha | Bravo |

| - | - |

| 中文 | Charlie |

| 👩‍❤️‍👩 | Delta |`

const file = await remark().use(remarkGfm).process(input)

console.log(String(file))

```

The above code shows how remark can be used to format markdown.

The output is as follows:

```markdown

| Alpha    | Bravo   |

| -------- | ------- |

| 中文       | Charlie |

| 👩‍❤️‍👩 | Delta   |

```

To improve the alignment of these full-width characters and emoji, pass a

`stringLength` function that calculates the visual width of cells.

One such algorithm is [`string-width`][string-width].

It can be used like so:

```diff

@@ -1,5 +1,6 @@

 import {remark} from 'remark'

 import remarkGfm from 'remark-gfm'

+import stringWidth from 'string-width'

@@ -10,7 +11,7 @@ async function main() {

 | 👩‍❤️‍👩 | Delta |`

-const file = await remark().use(remarkGfm).process(input)

+const file = await remark()

+  .use(remarkGfm, {stringLength: stringWidth})

+  .process(input)

   console.log(String(file))

```

The output of our code with these changes is as follows:

```markdown

| Alpha | Bravo   |

| ----- | ------- |

| 中文  | Charlie |

| 👩‍❤️‍👩    | Delta   |

```

## Bugs

For bugs present in GFM but not here, or other peculiarities that are

supported, see each corresponding readme:

*   [autolink literal](https://github.com/micromark/micromark-extension-gfm-autolink-literal#bugs)

*   [footnote](https://github.com/micromark/micromark-extension-gfm-footnote#bugs)

*   strikethrough: n/a

*   [table](https://github.com/micromark/micromark-extension-gfm-table#bugs)

*   tasklists: n/a

## Authoring

For recommendations on how to author GFM, see each corresponding readme:

*   [autolink literal](https://github.com/micromark/micromark-extension-gfm-autolink-literal#authoring)

*   [footnote](https://github.com/micromark/micromark-extension-gfm-footnote#authoring)

*   [strikethrough](https://github.com/micromark/micromark-extension-gfm-strikethrough#authoring)

*   [table](https://github.com/micromark/micromark-extension-gfm-table#authoring)

*   [tasklists](https://github.com/micromark/micromark-extension-gfm-task-list-item#authoring)

## HTML

This plugin does not handle how markdown is turned to HTML.

See [`remark-rehype`][remark-rehype] for how that happens and how to change it.

## CSS

For info on how GitHub styles these features, see each corresponding readme:

*   [autolink literal](https://github.com/micromark/micromark-extension-gfm-autolink-literal#css)

*   [footnote](https://github.com/micromark/micromark-extension-gfm-footnote#css)

*   [strikethrough](https://github.com/micromark/micromark-extension-gfm-strikethrough#css)

*   [table](https://github.com/micromark/micromark-extension-gfm-table#css)

*   [tasklists](https://github.com/micromark/micromark-extension-gfm-task-list-item#css)

## Syntax

For info on the syntax of these features, see each corresponding readme:

*   [autolink literal](https://github.com/micromark/micromark-extension-gfm-autolink-literal#syntax)

*   [footnote](https://github.com/micromark/micromark-extension-gfm-footnote#syntax)

*   [strikethrough](https://github.com/micromark/micromark-extension-gfm-strikethrough#syntax)

*   [table](https://github.com/micromark/micromark-extension-gfm-table#syntax)

*   [tasklists](https://github.com/micromark/micromark-extension-gfm-task-list-item#syntax)

## Syntax tree

For info on the syntax tree of these features, see each corresponding readme:

*   [autolink literal](https://github.com/syntax-tree/mdast-util-gfm-autolink-literal#syntax-tree)

*   [footnote](https://github.com/syntax-tree/mdast-util-gfm-footnote#syntax-tree)

*   [strikethrough](https://github.com/syntax-tree/mdast-util-gfm-strikethrough#syntax-tree)

*   [table](https://github.com/syntax-tree/mdast-util-gfm-table#syntax-tree)

*   [tasklists](https://github.com/syntax-tree/mdast-util-gfm-task-list-item#syntax-tree)

## Types

This package is fully typed with [TypeScript][].

It exports the additional type [`Options`][api-options].

The node types are supported in `@types/mdast` by default.

## Compatibility

Projects maintained by the unified collective are compatible with maintained

versions of Node.js.

When we cut a new major release, we drop support for unmaintained versions of

Node.

This means we try to keep the current release line, `remark-gfm@^4`, compatible

with Node.js 16.

This plugin works with `remark-parse` version 11+ (`remark` version 15+).

The previous version (v3) worked with `remark-parse` version 10 (`remark`

version 14).

Before that, v2 worked with `remark-parse` version 9 (`remark` version 13).

Earlier versions of `remark-parse` and `remark` had a `gfm` option that enabled

this functionality, which defaulted to true.

## Security

Use of `remark-frontmatter` does not involve **[rehype][]** ([hast][]) or user

content so there are no openings for [cross-site scripting (XSS)][wiki-xss]

attacks.

## Related

*   [`remark-github`][remark-github]

    — link references to commits, issues, PRs, and users

*   [`remark-breaks`][remark-breaks]

    — support breaks without needing spaces or escapes (enters to `
`)

*   [`remark-frontmatter`][remark-frontmatter]

    — support frontmatter (YAML, TOML, and more)

*   [`remark-directive`](https://github.com/remarkjs/remark-directive)

    — support directives

*   [`remark-math`](https://github.com/remarkjs/remark-math)

    — support math

*   [`remark-mdx`](https://github.com/mdx-js/mdx/tree/main/packages/remark-mdx)

    — support MDX (ESM, JSX, expressions)

## Contribute

See [`contributing.md`][contributing] in [`remarkjs/.github`][health] for ways

to get started.

See [`support.md`][support] for ways to get help.

This project has a [code of conduct][coc].

By interacting with this repository, organization, or community you agree to

abide by its terms.

## License

[MIT][license] © [Titus Wormer][author]

[build-badge]: https://github.com/remarkjs/remark-gfm/workflows/main/badge.svg

[build]: https://github.com/remarkjs/remark-gfm/actions

[coverage-badge]: https://img.shields.io/codecov/c/github/remarkjs/remark-gfm.svg

[coverage]: https://codecov.io/github/remarkjs/remark-gfm

[downloads-badge]: https://img.shields.io/npm/dm/remark-gfm.svg

[downloads]: https://www.npmjs.com/package/remark-gfm

[size-badge]: https://img.shields.io/bundlejs/size/remark-gfm

[size]: https://bundlejs.com/?q=remark-gfm

[sponsors-badge]: https://opencollective.com/unified/sponsors/badge.svg

[backers-badge]: https://opencollective.com/unified/backers/badge.svg

[collective]: https://opencollective.com/unified

[chat-badge]: https://img.shields.io/badge/chat-discussions-success.svg

[chat]: https://github.com/remarkjs/remark/discussions

[npm]: https://docs.npmjs.com/cli/install

[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c

[esmsh]: https://esm.sh

[health]: https://github.com/remarkjs/.github

[contributing]: https://github.com/remarkjs/.github/blob/HEAD/contributing.md

[support]: https://github.com/remarkjs/.github/blob/HEAD/support.md

[coc]: https://github.com/remarkjs/.github/blob/HEAD/code-of-conduct.md

[license]: license

[author]: https://wooorm.com

[gfm]: https://github.github.com/gfm/

[hast]: https://github.com/syntax-tree/hast

[mdast-util-from-markdown]: https://github.com/syntax-tree/mdast-util-from-markdown

[mdast-util-gfm]: https://github.com/syntax-tree/mdast-util-gfm

[micromark]: https://github.com/micromark/micromark

[micromark-extension-gfm]: https://github.com/micromark/micromark-extension-gfm

[rehype]: https://github.com/rehypejs/rehype

[remark]: https://github.com/remarkjs/remark

[remark-breaks]: https://github.com/remarkjs/remark-breaks

[remark-frontmatter]: https://github.com/remarkjs/remark-frontmatter

[remark-github]: https://github.com/remarkjs/remark-github

[remark-rehype]: https://github.com/remarkjs/remark-rehype

[rehype-slug]: https://github.com/rehypejs/rehype-slug

[string-width]: https://github.com/sindresorhus/string-width

[typescript]: https://www.typescriptlang.org

[unified]: https://github.com/unifiedjs/unified

[wiki-xss]: https://en.wikipedia.org/wiki/Cross-site_scripting

[api-options]: #options

[api-remark-gfm]: #unifieduseremarkgfm-options