rehype
v13.0.2
Published
HTML processor powered by plugins part of the unified collective
Downloads
2,117,155
Readme
rehype
unified processor to add support for parsing from HTML and serializing to HTML.
Contents
- What is this?
- When should I use this?
- Install
- Use
- API
- Examples
- Syntax
- Syntax tree
- Types
- Compatibility
- Security
- Contribute
- Sponsor
- License
What is this?
This package is a unified processor with support for parsing HTML as input
and serializing HTML as output by using unified with
rehype-parse and rehype-stringify.
See the monorepo readme for info on what the rehype ecosystem is.
When should I use this?
You can use this package when you want to use unified, have HTML as input, and
want HTML as output.
This package is a shortcut for
unified().use(rehypeParse).use(rehypeStringify).
When the input isn’t HTML (meaning you don’t need rehype-parse) or the
output is not HTML (you don’t need rehype-stringify), it’s recommended to
use unified directly.
When you’re in a browser, trust your content, don’t need positional info on
nodes or formatting options, and value a smaller bundle size, you can use
rehype-dom instead.
When you want to inspect and format HTML files in a project on the command
line, you can use rehype-cli.
Install
This package is ESM only. In Node.js (version 16+), install with npm:
npm install rehypeIn Deno with esm.sh:
import {rehype} from 'https://esm.sh/rehype@13'In browsers with esm.sh:
<script type="module">
import {rehype} from 'https://esm.sh/rehype@13?bundle'
</script>Use
Say we have the following module example.js:
import {rehype} from 'rehype'
import rehypeFormat from 'rehype-format'
const file = await rehype().use(rehypeFormat).process(`<!doctype html>
<html lang=en>
<head>
<title>Hi!</title>
</head>
<body>
<h1>Hello!</h1>
</body></html>`)
console.error(String(file))…running that with node example.js yields:
<!doctype html>
<html lang="en">
<head>
<title>Hi!</title>
</head>
<body>
<h1>Hello!</h1>
</body>
</html>API
This package exports the identifier rehype.
There is no default export.
rehype()
Create a new unified processor that already uses
rehype-parse and rehype-stringify.
You can add more plugins with use.
See unified for more information.
Examples
Example: passing options to rehype-parse, rehype-stringify
When you use rehype-parse or rehype-stringify manually you can pass options
directly to them with use.
Because both plugins are already used in rehype, that’s not possible.
To define options for them, you can instead pass options to data:
import {rehype} from 'rehype'
import {reporter} from 'vfile-reporter'
const file = await rehype()
.data('settings', {
emitParseErrors: true,
fragment: true,
preferUnquoted: true
})
.process('<div title="a" title="b"></div>')
console.error(reporter(file))
console.log(String(file))…yields:
1:21-1:21 warning Unexpected duplicate attribute duplicate-attribute hast-util-from-html
⚠ 1 warning<div title=a></div>Syntax
HTML is parsed and serialized according to WHATWG HTML (the living standard), which is also followed by all browsers.
Syntax tree
The syntax tree format used in rehype is hast.
Types
This package is fully typed with TypeScript. It exports no additional types.
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@^13, compatible
with Node.js 16.
Security
As rehype works on HTML, and improper use of HTML can open you up to a
cross-site scripting (XSS) attack, use of rehype can also be unsafe.
Use rehype-sanitize to make the tree safe.
Use of rehype plugins could also open you up to other attacks. Carefully assess each plugin and the risks involved in using them.
For info on how to submit a report, see our security policy.
Contribute
See contributing.md in rehypejs/.github for ways
to get started.
See support.md for ways to get help.
This project has a code of conduct. By interacting with this repository, organization, or community you agree to abide by its terms.
Sponsor
Support this effort and give back by sponsoring on OpenCollective!