252 lines
6.5 KiB
Markdown
252 lines
6.5 KiB
Markdown
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# rehype-slug
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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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**[rehype][]** plugin to add `id`s to headings.
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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(rehypeSlug[, options])`](#unifieduserehypeslug-options)
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* [`Options`](#options)
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* [Types](#types)
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* [Compatibility](#compatibility)
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* [Security](#security)
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* [Related](#related)
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* [Contribute](#contribute)
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* [License](#license)
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## What is this?
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This package is a [unified][] ([rehype][]) plugin to add `id`s to headings.
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It looks for headings (so `<h1>` through `<h6>`) that do not yet have `id`s
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and adds `id` attributes to them based on the text they contain.
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The algorithm that does this is [`github-slugger`][github-slugger], which
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matches how GitHub works.
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**unified** is a project that transforms content with abstract syntax trees
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(ASTs).
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**rehype** adds support for HTML to unified.
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**hast** is the HTML AST that rehype uses.
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This is a rehype plugin that adds `id`s to headings in the AST.
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## When should I use this?
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This plugin is useful when you have relatively long documents and you want to be
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able to link to particular sections.
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A different plugin, [`rehype-autolink-headings`][rehype-autolink-headings], adds
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links to these headings back to themselves, which is useful as it lets users
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more easily link to particular sections.
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## Install
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This package is [ESM only][esm].
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In Node.js (version 16+), install with [npm][]:
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```sh
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npm install rehype-slug
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```
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In Deno with [`esm.sh`][esmsh]:
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```js
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import rehypeSlug from 'https://esm.sh/rehype-slug@6'
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```
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In browsers with [`esm.sh`][esmsh]:
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```html
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<script type="module">
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import rehypeSlug from 'https://esm.sh/rehype-slug@6?bundle'
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</script>
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```
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## Use
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Say we have the following file `example.html`:
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```html
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<h1 id=some-id>Lorem ipsum</h1>
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<h2>Dolor sit amet 😪</h2>
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<h3>consectetur & adipisicing</h3>
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<h4>elit</h4>
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<h5>elit</h5>
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```
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…and our module `example.js` looks as follows:
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```js
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import {read} from 'to-vfile'
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import {rehype} from 'rehype'
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import rehypeSlug from 'rehype-slug'
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const file = await rehype()
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.data('settings', {fragment: true})
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.use(rehypeSlug)
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.process(await read('example.html'))
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console.log(String(file))
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```
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…then running `node example.js` yields:
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```html
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<h1 id="some-id">Lorem ipsum</h1>
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<h2 id="dolor-sit-amet-">Dolor sit amet 😪</h2>
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<h3 id="consectetur--adipisicing">consectetur & adipisicing</h3>
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<h4 id="elit">elit</h4>
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<h5 id="elit-1">elit</h5>
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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 [`rehypeSlug`][api-rehype-slug].
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### `unified().use(rehypeSlug[, options])`
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Add `id`s to headings.
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###### Parameters
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* `options` ([`Options`][api-options], optional)
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— configuration
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###### Returns
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Transform ([`Transformer`][unified-transformer]).
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### `Options`
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Configuration (TypeScript type).
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###### Fields
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* `prefix` (`string`, default: `''`)
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— prefix to add in front of `id`s
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## Types
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This package is fully typed with [TypeScript][].
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It exports the additional type [`Options`][api-options].
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## Compatibility
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Projects maintained by the unified collective are compatible with maintained
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versions of Node.js.
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When we cut a new major release, we drop support for unmaintained versions of
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Node.
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This means we try to keep the current release line, `rehype-slug@^6`,
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compatible with Node.js 16.
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This plugin works with `rehype-parse` version 1+, `rehype-stringify` version 1+,
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`rehype` version 1+, and `unified` version 4+.
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## Security
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Use of `rehype-slug` can open you up to a [cross-site scripting (XSS)][xss]
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attack as it sets `id` attributes on headings, which causes what is known
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as “DOM clobbering”.
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Please use [`rehype-sanitize`][rehype-sanitize] and see its
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[Example: headings (DOM clobbering)][rehype-sanitize-example] for information on
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how to properly solve it.
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## Related
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* [`rehype-autolink-headings`][rehype-autolink-headings]
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— add links to headings with IDs back to themselves
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## Contribute
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See [`contributing.md`][contributing] in [`rehypejs/.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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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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## License
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[MIT][license] © [Titus Wormer][author]
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<!-- Definitions -->
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[build-badge]: https://github.com/rehypejs/rehype-slug/workflows/main/badge.svg
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[build]: https://github.com/rehypejs/rehype-slug/actions
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[coverage-badge]: https://img.shields.io/codecov/c/github/rehypejs/rehype-slug.svg
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[coverage]: https://codecov.io/github/rehypejs/rehype-slug
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[downloads-badge]: https://img.shields.io/npm/dm/rehype-slug.svg
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[downloads]: https://www.npmjs.com/package/rehype-slug
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[size-badge]: https://img.shields.io/bundlejs/size/rehype-slug
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[size]: https://bundlejs.com/?q=rehype-slug
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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/rehypejs/rehype/discussions
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[npm]: https://docs.npmjs.com/cli/install
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[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
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[esmsh]: https://esm.sh
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[health]: https://github.com/rehypejs/.github
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[contributing]: https://github.com/rehypejs/.github/blob/main/contributing.md
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[support]: https://github.com/rehypejs/.github/blob/main/support.md
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[coc]: https://github.com/rehypejs/.github/blob/main/code-of-conduct.md
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[license]: license
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[author]: https://wooorm.com
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[github-slugger]: https://github.com/Flet/github-slugger
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[rehype]: https://github.com/rehypejs/rehype
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[rehype-autolink-headings]: https://github.com/rehypejs/rehype-autolink-headings
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[rehype-sanitize]: https://github.com/rehypejs/rehype-sanitize
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[rehype-sanitize-example]: https://github.com/rehypejs/rehype-sanitize#example-headings-dom-clobbering
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[typescript]: https://www.typescriptlang.org
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[unified]: https://github.com/unifiedjs/unified
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[unified-transformer]: https://github.com/unifiedjs/unified#transformer
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[xss]: https://en.wikipedia.org/wiki/Cross-site_scripting
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[api-options]: #options
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[api-rehype-slug]: #unifieduserehypeslug-options
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