Rehype-document NPM

rehype-document

rehype plugin to wrap a fragment in a document.

What is this?

This package is a unified (rehype) plugin to wrap a fragment in a document. It’s especially useful when going from a markdown file that represents an article and turning it into a complete HTML document.

unified is a project that transforms content with abstract syntax trees (ASTs). rehype adds support for HTML to unified. hast is the HTML AST that rehype uses. This is a rehype plugin that wraps a fragment in a document.

When should I use this?

This project is useful when you want to turn a fragment (specifically, some nodes that can exist in a <body> element) into a whole document (a <html>, <head>, and <body>, where the latter will contain the fragment).

This plugin can make fragments valid whole documents. It’s not a (social) metadata manager. That’s done by rehype-meta. You can use both together.

Install

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

npm install rehype-document

In Deno with esm.sh:

import rehypeDocument from 'https://esm.sh/rehype-document@7'

In browsers with esm.sh:

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

Use

Say we have the following file example.md:

## Hello world!

This is **my** document.

…and a module example.js :

import rehypeDocument from 'rehype-document'
import rehypeStringify from 'rehype-stringify'
import remarkParse from 'remark-parse'
import remarkRehype from 'remark-rehype'
import {read} from 'to-vfile'
import {unified} from 'unified'

const file = await unified()
  .use(remarkParse)
  .use(remarkRehype)
  .use(rehypeDocument, {title: 'Hi!'})
  .use(rehypeStringify)
  .process(await read('example.md'))

console.log(String(file))

…then running node example.js yields:

<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Hi!</title>
<meta content="width=device-width, initial-scale=1" name="viewport">
</head>
<body>
<h2>Hello world!</h2>
<p>This is <strong>my</strong> document.</p>
</body>
</html>

API

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

`unified().use(rehypeDocument[, options])`

Wrap a fragment in a document.

Parameters

options (Options, optional) — configuration

Returns

Transform (Transformer).

`Options`

Configuration (TypeScript type).

Fields

css (Array<string> or string, optional) — URLs to stylesheets to use in <link>s
dir ('auto', 'ltr', or 'rtl', optional) — direction of the document
js (Array<string> or string, optional) — URLs to scripts to use as src on <script>s
lang (string, default: 'en') — language of document; should be a BCP 47 language tag
link (Array<Properties> or Properties, optional) — generate extra <link>s with these properties; passed as properties to hastscript with 'link'
meta (Array<Properties> or Properties, optional) — generate extra <meta>s with these properties; passed as properties to hastscript with 'meta'
responsive (boolean, default: true) — generate a meta[viewport]
script (Array<string> or string, optional) — JavaScript source code of <script>s to add at end of body
style (Array<string> or string, optional) — CSS source code of <style>s to add
title (string, optional) — text to use as title; defaults to the file name (if any); can bet set with file.data.matter.title (vfile-matter) and file.data.meta.title (rehype-infer-title-meta), which are preferred

Example

Example: language and direction

This example shows how to set a language:

import rehypeDocument from 'rehype-document'
import rehypeParse from 'rehype-parse'
import rehypeStringify from 'rehype-stringify'
import {unified} from 'unified'

const file = await unified()
  .use(rehypeParse, {fragment: true})
  .use(rehypeDocument, {title: 'פּלוטאָ', language: 'yi', dir: 'rtl'})
  .use(rehypeStringify)
  .process('<h1>העלא, פּלוטאָ!</h1>')

console.log(String(file))

Yields:

<!doctype html>
<html dir="rtl" lang="yi">
<head>
<meta charset="utf-8">
<title>פּלוטאָ</title>
<meta content="width=device-width, initial-scale=1" name="viewport">
</head>
<body>
<h1>העלא, פּלוטאָ!</h1>
</body>
</html>

Example: CSS

This example shows how to reference CSS files and include stylesheets:

import rehypeDocument from 'rehype-document'
import rehypeParse from 'rehype-parse'
import rehypeStringify from 'rehype-stringify'
import {unified} from 'unified'

const file = await unified()
  .use(rehypeParse, {fragment: true})
  .use(rehypeDocument, {
    css: 'https://example.com/index.css',
    style: 'body { color: red }'
  })
  .use(rehypeStringify)
  .process('')

console.log(String(file))

Yields:

<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta content="width=device-width, initial-scale=1" name="viewport">
<style>body { color: red }</style>
<link href="https://example.com/index.css" rel="stylesheet">
</head>
<body>
</body>
</html>

Example: JS

This example shows how to reference JS files and include scripts:

import rehypeDocument from 'rehype-document'
import rehypeParse from 'rehype-parse'
import rehypeStringify from 'rehype-stringify'
import {unified} from 'unified'

const file = await unified()
  .use(rehypeParse, {fragment: true})
  .use(rehypeDocument, {
    js: 'https://example.com/index.js',
    script: 'console.log(1)'
  })
  .use(rehypeStringify)
  .process('')

console.log(String(file))

Yields:

<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta content="width=device-width, initial-scale=1" name="viewport">
</head>
<body>
<script>console.log(1)</script>
<script src="https://example.com/index.js"></script>
</body>
</html>

Example: metadata and links

This example shows how to define metadata and include links (other than styles):

import rehypeDocument from 'rehype-document'
import rehypeParse from 'rehype-parse'
import rehypeStringify from 'rehype-stringify'
import {unified} from 'unified'

const file = await unified()
  .use(rehypeParse, {fragment: true})
  .use(rehypeDocument, {
    link: [
      {href: '/favicon.ico', rel: 'icon', sizes: 'any'},
      {href: '/icon.svg', rel: 'icon', type: 'image/svg+xml'}
    ],
    meta: [{content: 'rehype-document', name: 'generator'}]
  })
  .use(rehypeStringify)
  .process('')

console.log(String(file))

Yields:

<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta content="width=device-width, initial-scale=1" name="viewport">
<meta content="rehype-document" name="generator">
<link href="/favicon.ico" rel="icon" sizes="any">
<link href="/icon.svg" rel="icon" type="image/svg+xml">
</head>
<body>
</body>
</html>

💡 Tip: rehype-meta is a (social) metadata manager.

Types

This package is fully typed with TypeScript. It exports the additional type 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-document@^7, compatible with Node.js 16.

This plugin works with rehype-parse version 3+, rehype-stringify version 3+, rehype version 5+, and unified version 6+.

Security

Use of rehype-document can open you up to a cross-site scripting (XSS) attack if you pass user provided content in options. Always be wary of user input and use rehype-sanitize.