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2024-10-14 06:09:33 +00:00
# rehype-katex
[![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]
**[rehype][]** plugin to render elements with a `language-math` class with
[KaTeX][].
## 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(rehypeKatex[, options])`](#unifieduserehypekatex-options)
* [`Options`](#options)
* [Markdown](#markdown)
* [HTML](#html)
* [CSS](#css)
* [Types](#types)
* [Compatibility](#compatibility)
* [Security](#security)
* [Related](#related)
* [Contribute](#contribute)
* [License](#license)
## What is this?
This package is a [unified][] ([rehype][]) plugin to render math.
You can add classes to HTML elements, use fenced code in markdown, or combine
with [`remark-math`][remark-math] for a `$C$` syntax extension.
## When should I use this?
This project is useful as it renders math with KaTeX at compile time, which
means that there is no client side JavaScript needed.
A different plugin, [`rehype-mathjax`][rehype-mathjax], does the same but with
[MathJax][].
## Install
This package is [ESM only][esm].
In Node.js (version 16+), install with [npm][]:
```sh
npm install rehype-katex
```
In Deno with [`esm.sh`][esmsh]:
```js
import rehypeKatex from 'https://esm.sh/rehype-katex@7'
```
In browsers with [`esm.sh`][esmsh]:
```html
<script type="module">
import rehypeKatex from 'https://esm.sh/rehype-katex@7?bundle'
</script>
```
## Use
Say our document `input.html` contains:
```html
<p>
Lift(<code class="language-math">L</code>) can be determined by Lift Coefficient
(<code class="language-math">C_L</code>) like the following equation.
</p>
<pre><code class="language-math">
L = \frac{1}{2} \rho v^2 S C_L
</code></pre>
```
…and our module `example.js` contains:
```js
import rehypeDocument from 'rehype-document'
import rehypeKatex from 'rehype-katex'
import rehypeParse from 'rehype-parse'
import rehypeStringify from 'rehype-stringify'
import {read, write} from 'to-vfile'
import {unified} from 'unified'
const file = await unified()
.use(rehypeParse, {fragment: true})
.use(rehypeDocument, {
// Get the latest one from: <https://katex.org/docs/browser>.
css: 'https://cdn.jsdelivr.net/npm/katex@0.16.8/dist/katex.min.css'
})
.use(rehypeKatex)
.use(rehypeStringify)
.process(await read('input.html'))
file.basename = 'output.html'
await write(file)
```
…then running `node example.js` creates an `output.html` with:
```html
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>input</title>
<meta content="width=device-width, initial-scale=1" name="viewport">
<link href="https://cdn.jsdelivr.net/npm/katex@0.16.8/dist/katex.min.css" rel="stylesheet">
</head>
<body>
<p>
Lift(<span class="katex"><!--…--></span>) can be determined by Lift Coefficient
(<span class="katex"><!--…--></span>) like the following equation.
</p>
<span class="katex-display"><!--…--></span>
</body>
</html>
```
…open `output.html` in a browser to see the rendered math.
## API
This package exports no identifiers.
The default export is [`rehypeKatex`][api-rehype-katex].
### `unified().use(rehypeKatex[, options])`
Render elements with a `language-math` (or `math-display`, `math-inline`)
class with [KaTeX][].
###### Parameters
* `options` ([`Options`][api-options])
— configuration
###### Returns
Transform ([`Transformer`][unified-transformer]).
### `Options`
Configuration (TypeScript type).
###### Type
```ts
import {KatexOptions} from 'katex'
type Options = Omit<KatexOptions, 'displayMode' | 'throwOnError'>
```
See [*Options* on `katex.org`][katex-options] for more info.
## Markdown
This plugin supports the syntax extension enabled by
[`remark-math`][remark-math].
It also supports math generated by using fenced code:
````markdown
```math
C_L
```
````
## HTML
The content of any element with a `language-math`, `math-inline`, or
`math-display` class is transformed.
The elements are replaced by what KaTeX renders.
Either a `math-display` class or using `<pre><code class="language-math">` will
result in “display” math: math that is a centered block on its own line.
## CSS
The HTML produced by KaTeX requires CSS to render correctly.
You should use `katex.css` somewhere on the page where the math is shown to
style it properly.
At the time of writing, the last version is:
```html
<!-- Get the latest one from: https://katex.org/docs/browser -->
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/katex@0.16.8/dist/katex.min.css">
```
## Types
This package is fully typed with [TypeScript][].
It exports the additional type [`Options`][api-options].
## 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, `rehype-katex@^7`,
compatible with Node.js 16.
This plugin works with unified version 6+ and rehype version 4+.
## Security
Assuming you trust KaTeX, using `rehype-katex` is safe.
A vulnerability in it could open you to a
[cross-site scripting (XSS)][wiki-xss] attack.
Be wary of user input and use [`rehype-sanitize`][rehype-sanitize].
When you don’t trust user content but do trust KaTeX, run `rehype-katex`
*after* `rehype-sanitize`:
```js
import rehypeKatex from 'rehype-katex'
import rehypeSanitize, {defaultSchema} from 'rehype-sanitize'
import rehypeStringify from 'rehype-stringify'
import remarkMath from 'remark-math'
import remarkParse from 'remark-parse'
import remarkRehype from 'remark-rehype'
import {unified} from 'unified'
const file = await unified()
.use(remarkParse)
.use(remarkMath)
.use(remarkRehype)
.use(rehypeSanitize, {
...defaultSchema,
attributes: {
...defaultSchema.attributes,
// The `language-*` regex is allowed by default.
code: [['className', /^language-./, 'math-inline', 'math-display']]
}
})
.use(rehypeKatex)
.use(rehypeStringify)
.process('$C$')
console.log(String(file))
```
## Related
* [`rehype-mathjax`][rehype-mathjax]
— same but with MathJax
* [`rehype-highlight`](https://github.com/rehypejs/rehype-highlight)
— highlight code blocks
* [`rehype-autolink-headings`](https://github.com/rehypejs/rehype-autolink-headings)
— add links to headings
* [`rehype-sanitize`](https://github.com/rehypejs/rehype-sanitize)
— sanitize HTML
* [`rehype-document`](https://github.com/rehypejs/rehype-document)
— wrap a document around the tree
## 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] © [Junyoung Choi][author]
<!-- Definitions -->
[build-badge]: https://github.com/remarkjs/remark-math/workflows/main/badge.svg
[build]: https://github.com/remarkjs/remark-math/actions
[coverage-badge]: https://img.shields.io/codecov/c/github/remarkjs/remark-math.svg
[coverage]: https://codecov.io/github/remarkjs/remark-math
[downloads-badge]: https://img.shields.io/npm/dm/rehype-katex.svg
[downloads]: https://www.npmjs.com/package/rehype-katex
[size-badge]: https://img.shields.io/bundlejs/size/rehype-katex
[size]: https://bundlejs.com/?q=rehype-katex
[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/main/contributing.md
[support]: https://github.com/remarkjs/.github/blob/main/support.md
[coc]: https://github.com/remarkjs/.github/blob/main/code-of-conduct.md
[license]: https://github.com/remarkjs/remark-math/blob/main/license
[author]: https://rokt33r.github.io
[katex]: https://github.com/Khan/KaTeX
[katex-options]: https://katex.org/docs/options.html
[rehype]: https://github.com/rehypejs/rehype
[rehype-sanitize]: https://github.com/rehypejs/rehype-sanitize
[unified]: https://github.com/unifiedjs/unified
[unified-transformer]: https://github.com/unifiedjs/unified#transformer
[typescript]: https://www.typescriptlang.org
[wiki-xss]: https://en.wikipedia.org/wiki/Cross-site_scripting
[mathjax]: https://www.mathjax.org
[remark-math]: ../remark-math/
[rehype-mathjax]: ../rehype-mathjax/
[api-options]: #options
[api-rehype-katex]: #unifieduserehypekatex-options
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