rehype-preset-minify

rehype preset to minify HTML.

What is this?

This package is a unified (rehype) preset to minify HTML.

When should I use this?

You can use this preset when you want to improve the size of HTML documents.

Install

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

npm install rehype-preset-minify

In Deno with esm.sh:

import rehypePresetMinify from 'https://esm.sh/rehype-preset-minify@7'

In browsers with esm.sh:

<script type="module">
  import rehypePresetMinify from 'https://esm.sh/rehype-preset-minify@7?bundle'
</script>

Use

On the API:

import rehypeParse from 'rehype-parse'
import rehypePresetMinify from 'rehype-preset-minify'
import rehypeStringify from 'rehype-stringify'
import {read} from 'to-vfile'
import {unified} from 'unified'

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

console.log(String(file))

On the CLI:

rehype input.html --use rehype-preset-minify --output output.html

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

 …
 "rehype": {
   "plugins": [
     …
+    "rehype-preset-minify",
     …
   ]
 }
 …

API

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

`unified().use(rehypePresetMinify)`

Preset to minify HTML (Preset).

You can reconfigure plugins in presets by using them afterwards with different options.

Example

In

<!doctype html>
<html lang="en-GB">
  <head>
    <meta charset="utf-8">
    <meta http-equiv="content-language" content="en-US">
    <script src="index.js" type="text/javascript" language="javascript">
      alert(true);
    </script>
    <link rel="stylesheet" href="index.css" type="text/css">
    <title>Foo  &amp;  bar</title>
  </head>
  <body>
    <h1 class="foo foo">bar  bar</h1>
    <p id="alfred" id="alfred">  <strong>foo</strong> <em>bar</em> </p>
    <button type="BUTTON" onclick="javascript:return false">Alpha</button>
  </body>
</html>

Out

<!doctypehtml><html lang=en><meta charset=utf8><script src=index.js></script><link href=index.css rel=stylesheet><title>Foo &#38 bar</title><h1 class=foo>bar bar</h1><p id=alfred><strong>foo</strong> <em>bar</em></p><button onclick=return!1 type=button>Alpha</button>

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-preset-minify@^7, 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.

unified

Project: rehypejs/rehype-minify

Package: rehype-preset-minify@6.0.0