hast (HTML) utility to transform to xast (XML).
- What is this?
- When should I use this?
- Install
- Use
- API
- Types
- Compatibility
- Security
- Related
- Contribute
- License
This package is a utility that takes a hast (HTML) syntax tree as input and turns it into a xast (XML) syntax tree. This package also supports embedded MDX nodes.
This project is useful when you want to deal with ASTs, and for some reason, have to deal with XML. One example of this is for EPUB (digital books).
There is no inverse of this utility, because not all XML is HTML.
A similar package,
hast-util-to-estree,
can turn hast into estree (JavaScript) as JSX,
which has some similarities to XML.
This package is ESM only. In Node.js (version 16+), install with npm:
npm install hast-util-to-xastIn Deno with esm.sh:
import {toXast} from 'https://esm.sh/hast-util-to-xast@3'In browsers with esm.sh:
<script type="module">
import {toXast} from 'https://esm.sh/hast-util-to-xast@3?bundle'
</script>Say our document example.html contains:
<!doctypehtml>
<title>Hello, World!</title>
<h1>👋, 🌍</h1>…and our module example.js looks as follows:
import fs from 'node:fs/promises'
import {fromHtml} from 'hast-util-from-html'
import {toXast} from 'hast-util-to-xast'
import {toXml} from 'xast-util-to-xml'
// Get the HTML syntax tree:
const hast = fromHtml(await fs.readFile('example.html'))
// Turn hast to xast:
const xast = toXast(hast)
// Serialize xast:
console.log(toXml(xast))…now running node example.js yields:
<!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml"><head><title>Hello, World!</title>
</head><body><h1>👋, 🌍</h1>
</body></html>This package exports the identifier toXast.
There is no default export.
Turn a hast tree into a xast tree.
xast tree (XastNode).
Configuration (TypeScript type).
Which space the document is in
(Space, default: 'html').
When an <svg> element is found in the HTML space,
this package already automatically switches to and from the SVG space when
entering and exiting it.
You can also switch explicitly with xmlns properties in hast,
but note that only HTML and SVG are supported.
Namespace (TypeScript type).
type Space = 'html' | 'svg'This package is fully typed with TypeScript.
It exports the additional types Options and
Space.
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,
hast-util-to-xast@3,
compatible with Node.js 16.
Both HTML and XML can be dangerous languages:
don’t trust user-provided data.
Use hast-util-santize
to make the hast tree safe before using this utility.
hastscript— create hast (HTML or SVG) treesxastscript— create xast (XML) treesxast-util-to-xml— serialize as XML
See contributing.md
in
syntax-tree/.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.
