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434 lines
13 KiB
Text
434 lines
13 KiB
Text
# remark-stringify
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[![Build][build-badge]][build]
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[![Coverage][coverage-badge]][coverage]
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[![Downloads][downloads-badge]][downloads]
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[![Size][size-badge]][size]
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[![Sponsors][sponsors-badge]][collective]
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[![Backers][backers-badge]][collective]
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[![Chat][chat-badge]][chat]
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**[remark][]** plugin to add support for serializing markdown.
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## Contents
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* [What is this?](#what-is-this)
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* [When should I use this?](#when-should-i-use-this)
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* [Install](#install)
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* [Use](#use)
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* [API](#api)
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* [`unified().use(remarkStringify[, options])`](#unifieduseremarkstringify-options)
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* [Syntax](#syntax)
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* [Syntax tree](#syntax-tree)
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* [Types](#types)
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* [Security](#security)
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* [Contribute](#contribute)
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* [Sponsor](#sponsor)
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* [License](#license)
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## What is this?
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This package is a [unified][] ([remark][]) plugin that defines how to take a
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syntax tree as input and turn it into serialized markdown.
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This plugin is built on [`mdast-util-to-markdown`][mdast-util-to-markdown],
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which turns [mdast][] syntax trees into a string.
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remark focusses on making it easier to transform content by abstracting such
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internals away.
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**unified** is a project that transforms content with abstract syntax trees
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(ASTs).
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**remark** adds support for markdown to unified.
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**mdast** is the markdown AST that remark uses.
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This is a remark plugin that defines how mdast is turned into markdown.
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## When should I use this?
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This plugin adds support to unified for serializing markdown.
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You can alternatively use [`remark`][remark-core] instead, which combines
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unified, [`remark-parse`][remark-parse], and this plugin.
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You can combine this plugin with other plugins to add syntax extensions.
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Notable examples that deeply integrate with it are
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[`remark-gfm`][remark-gfm],
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[`remark-mdx`][remark-mdx],
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[`remark-frontmatter`][remark-frontmatter],
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[`remark-math`][remark-math], and
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[`remark-directive`][remark-directive].
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You can also use any other [remark plugin][plugin] before `remark-stringify`.
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If you want to handle syntax trees manually, you can use
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[`mdast-util-to-markdown`][mdast-util-to-markdown].
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## Install
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This package is [ESM only](https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c).
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In Node.js (version 12.20+, 14.14+, or 16.0+), install with [npm][]:
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```sh
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npm install remark-stringify
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```
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In Deno with [Skypack][]:
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```js
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import remarkStringify from 'https://cdn.skypack.dev/remark-stringify@10?dts'
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```
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In browsers with [Skypack][]:
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```html
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<script type="module">
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import remarkStringify from 'https://cdn.skypack.dev/remark-stringify@10?min'
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</script>
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```
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## Use
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Say we have the following module `example.js`:
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```js
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import {unified} from 'unified'
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import rehypeParse from 'rehype-parse'
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import rehypeRemark from 'rehype-remark'
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import remarkStringify from 'remark-stringify'
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main()
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async function main() {
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const file = await unified()
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.use(rehypeParse)
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.use(rehypeRemark)
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.use(remarkStringify, {
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bullet: '*',
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fence: '~',
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fences: true,
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incrementListMarker: false
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})
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.process('<h1>Hello, world!</h1>')
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console.log(String(file))
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}
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```
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Running that with `node example.js` yields:
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```markdown
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# Hello, world!
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```
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## API
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This package exports no identifiers.
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The default export is `remarkStringify`.
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### `unified().use(remarkStringify[, options])`
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Add support for serializing markdown.
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Options are passed to [`mdast-util-to-markdown`][mdast-util-to-markdown]:
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all formatting options are supported.
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##### `options`
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Configuration (optional).
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###### `options.bullet`
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Marker to use for bullets of items in unordered lists (`'*'`, `'+'`, or `'-'`,
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default: `'*'`).
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###### `options.bulletOther`
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Marker to use in certain cases where the primary bullet doesn’t work (`'*'`,
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`'+'`, or `'-'`, default: depends).
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See [`mdast-util-to-markdown`][mdast-util-to-markdown] for more information.
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###### `options.bulletOrdered`
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Marker to use for bullets of items in ordered lists (`'.'` or `')'`, default:
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`'.'`).
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###### `options.bulletOrderedOther`
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Marker to use in certain cases where the primary bullet for ordered items
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doesn’t work (`'.'` or `')'`, default: none).
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See [`mdast-util-to-markdown`][mdast-util-to-markdown] for more information.
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###### `options.closeAtx`
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Whether to add the same number of number signs (`#`) at the end of an ATX
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heading as the opening sequence (`boolean`, default: `false`).
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###### `options.emphasis`
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Marker to use for emphasis (`'*'` or `'_'`, default: `'*'`).
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###### `options.fence`
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Marker to use for fenced code (``'`'`` or `'~'`, default: ``'`'``).
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###### `options.fences`
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Whether to use fenced code always (`boolean`, default: `false`).
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The default is to use fenced code if there is a language defined, if the code is
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empty, or if it starts or ends in blank lines.
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###### `options.incrementListMarker`
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Whether to increment the counter of ordered lists items (`boolean`, default:
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`true`).
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###### `options.listItemIndent`
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How to indent the content of list items (`'one'`, `'tab'`, or `'mixed'`,
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default: `'tab'`).
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Either with the size of the bullet plus one space (when `'one'`), a tab stop
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(`'tab'`), or depending on the item and its parent list (`'mixed'`, uses `'one'`
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if the item and list are tight and `'tab'` otherwise).
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###### `options.quote`
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Marker to use for titles (`'"'` or `"'"`, default: `'"'`).
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###### `options.resourceLink`
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Whether to always use resource links (`boolean`, default: `false`).
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The default is to use autolinks (`<https://example.com>`) when possible
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and resource links (`[text](url)`) otherwise.
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###### `options.rule`
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Marker to use for thematic breaks (`'*'`, `'-'`, or `'_'`, default: `'*'`).
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###### `options.ruleRepetition`
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Number of markers to use for thematic breaks (`number`, default:
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`3`, min: `3`).
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###### `options.ruleSpaces`
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Whether to add spaces between markers in thematic breaks (`boolean`, default:
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`false`).
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###### `options.setext`
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Whether to use setext headings when possible (`boolean`, default: `false`).
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The default is to always use ATX headings (`# heading`) instead of setext
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headings (`heading\n=======`).
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Setext headings can’t be used for empty headings or headings with a rank of
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three or more.
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###### `options.strong`
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Marker to use for strong (`'*'` or `'_'`, default: `'*'`).
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###### `options.tightDefinitions`
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Whether to join definitions without a blank line (`boolean`, default: `false`).
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The default is to add blank lines between any flow (“block”) construct.
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###### `options.handlers`
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This option is a bit advanced as it requires knowledge of ASTs, so we defer
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to the documentation available in
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[`mdast-util-to-markdown`][mdast-util-to-markdown].
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###### `options.join`
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This option is a bit advanced as it requires knowledge of ASTs, so we defer
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to the documentation available in
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[`mdast-util-to-markdown`][mdast-util-to-markdown].
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###### `options.unsafe`
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This option is a bit advanced as it requires deep knowledge of markdown, so we
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defer to the documentation available in
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[`mdast-util-to-markdown`][mdast-util-to-markdown].
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## Syntax
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Markdown is serialized according to CommonMark but care is taken to format in
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such a way that the resulting markdown should work with most markdown parsers.
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Other plugins can add support for syntax extensions.
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## Syntax tree
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The syntax tree format used in remark is [mdast][].
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## Types
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This package is fully typed with [TypeScript][].
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An `Options` type is exported, which models the interface of accepted options.
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## Security
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As markdown can be turned into HTML and improper use of HTML can open you up to
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[cross-site scripting (XSS)][xss] attacks, use of remark can be unsafe.
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When going to HTML, you will likely combine remark with **[rehype][]**, in which
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case you should use [`rehype-sanitize`][rehype-sanitize].
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Use of remark plugins could also open you up to other attacks.
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Carefully assess each plugin and the risks involved in using them.
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For info on how to submit a report, see our [security policy][security].
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## Contribute
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See [`contributing.md`][contributing] in [`remarkjs/.github`][health] for ways
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to get started.
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See [`support.md`][support] for ways to get help.
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Join us in [Discussions][chat] to chat with the community and contributors.
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This project has a [code of conduct][coc].
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By interacting with this repository, organization, or community you agree to
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abide by its terms.
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## Sponsor
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Support this effort and give back by sponsoring on [OpenCollective][collective]!
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<!--lint ignore no-html-->
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<table>
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<tr valign="middle">
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<td width="20%" align="center" rowspan="2" colspan="2">
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<a href="https://vercel.com">Vercel</a><br><br>
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<a href="https://vercel.com"><img src="https://avatars1.githubusercontent.com/u/14985020?s=256&v=4" width="128"></a>
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</td>
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<td width="20%" align="center" rowspan="2" colspan="2">
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<a href="https://motif.land">Motif</a><br><br>
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<a href="https://motif.land"><img src="https://avatars1.githubusercontent.com/u/74457950?s=256&v=4" width="128"></a>
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</td>
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<td width="20%" align="center" rowspan="2" colspan="2">
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<a href="https://www.hashicorp.com">HashiCorp</a><br><br>
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<a href="https://www.hashicorp.com"><img src="https://avatars1.githubusercontent.com/u/761456?s=256&v=4" width="128"></a>
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</td>
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<td width="20%" align="center" rowspan="2" colspan="2">
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<a href="https://www.gatsbyjs.org">Gatsby</a><br><br>
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<a href="https://www.gatsbyjs.org"><img src="https://avatars1.githubusercontent.com/u/12551863?s=256&v=4" width="128"></a>
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</td>
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<td width="20%" align="center" rowspan="2" colspan="2">
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<a href="https://www.netlify.com">Netlify</a><br><br>
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<!--OC has a sharper image-->
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<a href="https://www.netlify.com"><img src="https://images.opencollective.com/netlify/4087de2/logo/256.png" width="128"></a>
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</td>
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</tr>
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<tr valign="middle">
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</tr>
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<tr valign="middle">
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<td width="10%" align="center">
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<a href="https://www.coinbase.com">Coinbase</a><br><br>
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<a href="https://www.coinbase.com"><img src="https://avatars1.githubusercontent.com/u/1885080?s=256&v=4" width="64"></a>
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</td>
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<td width="10%" align="center">
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<a href="https://themeisle.com">ThemeIsle</a><br><br>
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<a href="https://themeisle.com"><img src="https://avatars1.githubusercontent.com/u/58979018?s=128&v=4" width="64"></a>
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</td>
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<td width="10%" align="center">
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<a href="https://expo.io">Expo</a><br><br>
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<a href="https://expo.io"><img src="https://avatars1.githubusercontent.com/u/12504344?s=128&v=4" width="64"></a>
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</td>
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<td width="10%" align="center">
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<a href="https://boosthub.io">Boost Hub</a><br><br>
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<a href="https://boosthub.io"><img src="https://images.opencollective.com/boosthub/6318083/logo/128.png" width="64"></a>
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</td>
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<td width="10%" align="center">
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<a href="https://www.holloway.com">Holloway</a><br><br>
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<a href="https://www.holloway.com"><img src="https://avatars1.githubusercontent.com/u/35904294?s=128&v=4" width="64"></a>
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</td>
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<td width="10%"></td>
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<td width="10%"></td>
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<td width="10%"></td>
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<td width="10%"></td>
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<td width="10%"></td>
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</tr>
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<tr valign="middle">
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<td width="100%" align="center" colspan="10">
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<br>
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<a href="https://opencollective.com/unified"><strong>You?</strong></a>
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<br><br>
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</td>
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</tr>
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</table>
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## License
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[MIT][license] © [Titus Wormer][author]
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<!-- Definitions -->
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[build-badge]: https://github.com/remarkjs/remark/workflows/main/badge.svg
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[build]: https://github.com/remarkjs/remark/actions
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[coverage-badge]: https://img.shields.io/codecov/c/github/remarkjs/remark.svg
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[coverage]: https://codecov.io/github/remarkjs/remark
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[downloads-badge]: https://img.shields.io/npm/dm/remark-stringify.svg
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[downloads]: https://www.npmjs.com/package/remark-stringify
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[size-badge]: https://img.shields.io/bundlephobia/minzip/remark-stringify.svg
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[size]: https://bundlephobia.com/result?p=remark-stringify
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[sponsors-badge]: https://opencollective.com/unified/sponsors/badge.svg
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[backers-badge]: https://opencollective.com/unified/backers/badge.svg
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[collective]: https://opencollective.com/unified
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[chat-badge]: https://img.shields.io/badge/chat-discussions-success.svg
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[chat]: https://github.com/remarkjs/remark/discussions
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[security]: https://github.com/remarkjs/.github/blob/main/security.md
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[health]: https://github.com/remarkjs/.github
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[contributing]: https://github.com/remarkjs/.github/blob/main/contributing.md
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[support]: https://github.com/remarkjs/.github/blob/main/support.md
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[coc]: https://github.com/remarkjs/.github/blob/main/code-of-conduct.md
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[license]: https://github.com/remarkjs/remark/blob/main/license
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[author]: https://wooorm.com
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[npm]: https://docs.npmjs.com/cli/install
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[skypack]: https://www.skypack.dev
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[unified]: https://github.com/unifiedjs/unified
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[remark]: https://github.com/remarkjs/remark
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[mdast]: https://github.com/syntax-tree/mdast
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[xss]: https://en.wikipedia.org/wiki/Cross-site_scripting
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[typescript]: https://www.typescriptlang.org
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[rehype]: https://github.com/rehypejs/rehype
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[rehype-sanitize]: https://github.com/rehypejs/rehype-sanitize
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[mdast-util-to-markdown]: https://github.com/syntax-tree/mdast-util-to-markdown
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[remark-gfm]: https://github.com/remarkjs/remark-gfm
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[remark-mdx]: https://github.com/mdx-js/mdx/tree/main/packages/remark-mdx
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[remark-frontmatter]: https://github.com/remarkjs/remark-frontmatter
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[remark-math]: https://github.com/remarkjs/remark-math
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[remark-directive]: https://github.com/remarkjs/remark-directive
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[remark-parse]: ../remark-parse/
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[remark-core]: ../remark/
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[plugin]: https://github.com/remarkjs/remark#plugin
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