rehype-concat-css-style
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!Chatchat-badgechatrehype plugin to concatenate
<style>
s together.Contents
* [`unified().use(rehypeConcatCssStyle)`](#unifieduserehypeconcatcssstyle)
What is this?
This package is a plugin that can improve performance by merging multiple CSS<style>
elements together.
This plugin can be dangerous if CSS is invalid.
Additionally, this plugin does not handle scoped
styles.
Those are deprecated anyway.When should I use this?
You can use this plugin when you are certain that your CSS is valid and you want to improve the size of HTML.Install
This package is ESM onlyesm. In Node.js (version 16+), install with npm:npm install rehype-concat-css-style
In Deno with
esm.sh
esm-sh:import rehypeConcatCssStyle from 'https://esm.sh/rehype-concat-css-style@4'
In browsers with
esm.sh
esm-sh:<script type="module">
import rehypeConcatCssStyle from 'https://esm.sh/rehype-concat-css-style@4?bundle'
</script>
Use
On the API:import rehypeConcatCssStyle from 'rehype-concat-css-style'
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(rehypeConcatCssStyle)
.use(rehypeStringify)
.process(await read('index.html'))
console.log(String(file))
On the CLI:
rehype input.html --use rehype-concat-css-style --output output.html
On the CLI in a config file (here a
package.json
):…
"rehype": {
"plugins": [
…
+ "rehype-concat-css-style",
…
]
}
…
API
This package exports no identifiers. The default export isrehypeConcatCssStyle
.unified().use(rehypeConcatCssStyle)
Concatenate <style>
elements together.Returns
Transform (Transformer
).Example
In
<style>b{color:red}</style>
<style>i{color:blue}</style>
Out
<style>b{color:red}i{color:blue}</style>
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-concat-css-style@^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)xss attack, use of rehype can also be unsafe. Userehype-sanitize
rehype-sanitize to make the tree safe.Contribute
Seecontributing.md
contributing in rehypejs/.github
health for ways
to get started.
See support.md
support for ways to get help.This project has a code of conductcoc. By interacting with this repository, organization, or community you agree to abide by its terms.