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rehype-css-to-top

v4.0.1

Published

rehype plugin to move CSS `<link>` to `<head>`

Downloads

127

Vulnerabilities

Powered byPowered by Snyk
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  • 0Medium
  • 0Low

Links

Git

Maintainers

remcohaszingremcohaszingwooormwooormkmckkmck

Keywords

cssheadhtmlmangleminifymovepluginrehyperehype-pluginunified

Readme

rehype-css-to-top

Build Coverage Downloads Size Sponsors Backers Chat

rehype plugin to move CSS <link>s to the head.

Contents

What is this?

This package is a plugin that can improve performance by decreasing the time to first render.

When should I use this?

You can use this plugin when you want to improve the speed of HTML documents.

Install

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

npm install rehype-css-to-top

In Deno with esm.sh:

import rehypeCssToTop from 'https://esm.sh/rehype-css-to-top@4'

In browsers with esm.sh:

<script type="module">
  import rehypeCssToTop from 'https://esm.sh/rehype-css-to-top@4?bundle'
</script>

Use

On the API:

import rehypeCssToTop from 'rehype-css-to-top'
import rehypeParse from 'rehype-parse'
import rehypeStringify from 'rehype-stringify'
import {read} from 'to-vfile'
import {unified} from 'unified'

const file = await unified()
  .use(rehypeParse)
  .use(rehypeCssToTop)
  .use(rehypeStringify)
  .process(await read('index.html'))

console.log(String(file))

On the CLI:

rehype input.html --use rehype-css-to-top --output output.html

On the CLI in a config file (here a package.json):

 …
 "rehype": {
   "plugins": [
     …
+    "rehype-css-to-top",
     …
   ]
 }
 …

API

This package exports no identifiers. The default export is rehypeCssToTop.

unified().use(rehypeCssToTop)

Move CSS <link>s to the head.

Returns

Transform (Transformer).

Example

In
<!doctype html><html><head></head><body><link rel="stylesheet" href="index.css"></body></html>
Out
<!doctype html><html><head><link rel="stylesheet" href="index.css"></head><body></body></html>

Syntax

HTML is parsed according to WHATWG HTML (the living standard), which is also followed by all browsers.

Syntax tree

The syntax tree used is hast.

Types

This package is fully typed with TypeScript.

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-css-to-top@^4, 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.

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.

License

MIT © Titus Wormer