mdast-util-gfm-strikethrough

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[mdast][] extensions to parse and serialize [GFM][] strikethrough.

Contents

* What is this?
* When to use this
* Install
* Use
* API
* gfmStrikethroughFromMarkdown()
* gfmStrikethroughToMarkdown()
* HTML
* Syntax
* Syntax tree
* Nodes
* Content model
* Types
* Compatibility
* Related
* Contribute
* License

What is this?

This package contains two extensions that add support for GFM strikethrough
syntax in markdown to [mdast][].
These extensions plug into
[mdast-util-from-markdown][mdast-util-from-markdown] (to support parsing
strikethrough in markdown into a syntax tree) and
[mdast-util-to-markdown][mdast-util-to-markdown] (to support serializing
strikethrough in syntax trees to markdown).

When to use this

You can use these extensions when you are working with
mdast-util-from-markdown and mdast-util-to-markdown already.

When working with mdast-util-from-markdown, you must combine this package
with [micromark-extension-gfm-strikethrough][extension].

When you don’t need a syntax tree, you can use [micromark][micromark]
directly with micromark-extension-gfm-strikethrough.

When you are working with syntax trees and want all of GFM, use
[mdast-util-gfm][mdast-util-gfm] instead.

All these packages are used [remark-gfm][remark-gfm], which
focusses on making it easier to transform content by abstracting these
internals away.

This utility does not handle how markdown is turned to HTML.
That’s done by [mdast-util-to-hast][mdast-util-to-hast].
If you want a different element, you should configure that utility.

Install

This package is [ESM only][esm].
In Node.js (version 16+), install with [npm][]:

``sh
npm install mdast-util-gfm-strikethrough
`

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

`js
import {gfmStrikethroughFromMarkdown, gfmStrikethroughToMarkdown} from 'https://esm.sh/mdast-util-gfm-strikethrough@2'
`

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

`html

`

Use

Say our document example.md contains:

`markdown
Emphasis, importance, and ~~strikethrough~~.
`

…and our module example.js looks as follows:

`js
import fs from 'node:fs/promises'
import {gfmStrikethrough} from 'micromark-extension-gfm-strikethrough'
import {fromMarkdown} from 'mdast-util-from-markdown'
import {gfmStrikethroughFromMarkdown, gfmStrikethroughToMarkdown} from 'mdast-util-gfm-strikethrough'
import {toMarkdown} from 'mdast-util-to-markdown'

const doc = await fs.readFile('example.md')

const tree = fromMarkdown(doc, {
extensions: [gfmStrikethrough()],
mdastExtensions: [gfmStrikethroughFromMarkdown()]
})

console.log(tree)

const out = toMarkdown(tree, {extensions: [gfmStrikethroughToMarkdown()]})

console.log(out)
`

Now, running node example yields:

`js
{
type: 'root',
children: [
{
type: 'paragraph',
children: [
{type: 'emphasis', children: [{type: 'text', value: 'Emphasis'}]},
{type: 'text', value: ', '},
{type: 'strong', children: [{type: 'text', value: 'importance'}]},
{type: 'text', value: ', and '},
{type: 'delete', children: [{type: 'text', value: 'strikethrough'}]},
{type: 'text', value: '.'}
]
}
]
}
`

`markdown
Emphasis, importance, and ~~strikethrough~~.
`

API

This package exports the identifiers
[gfmStrikethroughFromMarkdown][api-gfm-strikethrough-from-markdown] and
[gfmStrikethroughToMarkdown][api-gfm-strikethrough-to-markdown].
There is no default export.

$3

Create an extension for [mdast-util-from-markdown][mdast-util-from-markdown]
to enable GFM strikethrough in markdown.

###### Returns

Extension for mdast-util-from-markdown to enable GFM strikethrough
([FromMarkdownExtension][from-markdown-extension]).

$3

Create an extension for [mdast-util-to-markdown][mdast-util-to-markdown] to
enable GFM strikethrough in markdown.

###### Returns

Extension for mdast-util-to-markdown to enable GFM strikethrough
([ToMarkdownExtension][to-markdown-extension]).

HTML

This utility does not handle how markdown is turned to HTML.
That’s done by [mdast-util-to-hast][mdast-util-to-hast].
If you want a different element, you should configure that utility.

Syntax

See [Syntax in micromark-extension-gfm-strikethrough][syntax].

Syntax tree

The following interfaces are added to [mdast][] by this utility.

$3

#### Delete

`idl
interface Delete <: Parent {
type: 'delete'
children: [TransparentContent]
}
`

Delete ([Parent][dfn-parent]) represents contents that are no longer
accurate or no longer relevant.

Delete can be used where [phrasing][dfn-phrasing-content]
content is expected.
Its content model is [transparent][dfn-transparent-content] content.

For example, the following markdown:

`markdown
~~alpha~~
`

Yields:

`js
{
type: 'delete',
children: [{type: 'text', value: 'alpha'}]
}
`

$3

#### PhrasingContent (GFM strikethrough)

`idl
type PhrasingContentGfm = Delete | PhrasingContent
`

Types

This package is fully typed with [TypeScript][].
It does not export additional types.

The Delete type of the mdast node is exposed from @types/mdast.

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,
mdast-util-gfm-strikethrough@^2, compatible with Node.js 16.

This utility works with mdast-util-from-markdown version 2+ and
mdast-util-to-markdown version 2+.

Related

* [remarkjs/remark-gfm][remark-gfm]
— remark plugin to support GFM
* [syntax-tree/mdast-util-gfm][mdast-util-gfm]
— same but all of GFM (autolink literals, footnotes, strikethrough, tables,
tasklists)
* [micromark/micromark-extension-gfm-strikethrough][extension]
— micromark extension to parse GFM strikethrough

Contribute

See [contributing.md][contributing] in [syntax-tree/.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/syntax-tree/mdast-util-gfm-strikethrough/workflows/main/badge.svg

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

[coverage-badge]: https://img.shields.io/codecov/c/github/syntax-tree/mdast-util-gfm-strikethrough.svg

[coverage]: https://codecov.io/github/syntax-tree/mdast-util-gfm-strikethrough

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

[downloads]: https://www.npmjs.com/package/mdast-util-gfm-strikethrough

[size-badge]: https://img.shields.io/badge/dynamic/json?label=minzipped%20size&query=$.size.compressedSize&url=https://deno.bundlejs.com/?q=mdast-util-gfm-strikethrough

[size]: https://bundlejs.com/?q=mdast-util-gfm-strikethrough

[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/syntax-tree/unist/discussions

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

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

[esmsh]: https://esm.sh

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

[license]: license

[author]: https://wooorm.com

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

[contributing]: https://github.com/syntax-tree/.github/blob/main/contributing.md

[support]: https://github.com/syntax-tree/.github/blob/main/support.md

[coc]: https://github.com/syntax-tree/.github/blob/main/code-of-conduct.md

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

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

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

[dfn-transparent-content]: https://github.com/syntax-tree/mdast#transparentcontent

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

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

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

[to-markdown-extension]: https://github.com/syntax-tree/mdast-util-to-markdown#options

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

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

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

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

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

[dfn-parent]: https://github.com/syntax-tree/mdast#parent

[dfn-phrasing-content]: #phrasingcontent-gfm-strikethrough

[api-gfm-strikethrough-from-markdown]: #gfmstrikethroughfrommarkdown

[api-gfm-strikethrough-to-markdown]: #gfmstrikethroughtomarkdown