Package Exports

hast-util-from-dom
hast-util-from-dom/index.js

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Readme

hast-util-from-dom

hast utility to transform from a DOM tree.

What is this?
When should I use this?
Install
Use
API
Types
Compatibility
Security
Contribute
Related
License

What is this?

This package is a utility that takes a DOM tree (from the actual DOM or from things like jsdom) as input and turns it into a hast (HTML) syntax tree.

When should I use this?

You can use this project when you want to use hast in browsers. This package is very small, but it does so by:

…not providing positional information
…potentially yielding varying results in different (especially older) browsers

The hast utility hast-util-to-dom does the inverse of this utility. It turns hast into a DOM tree.

The rehype plugin rehype-dom-parse wraps this utility to parse HTML with DOM APIs.

Install

This package is ESM only. In Node.js (version 14.14+ and 16.0+), install with npm:

npm install hast-util-from-dom

In Deno with esm.sh:

import {fromDom} from 'https://esm.sh/hast-util-from-dom@4'

In browsers with esm.sh:

<script type="module">
  import {fromDom} from 'https://esm.sh/hast-util-from-dom@4?bundle'
</script>

Use

Say our page example.html looks as follows:

<!doctype html>
<title>Example</title>
<body>
  <main>
    <h1>Hi</h1>
    <p><em>Hello</em>, world!</p>
  </main>
  <script type="module">
    import {fromDom} from 'https://esm.sh/hast-util-from-dom@4?bundle'

    const hast = fromDom(document.querySelector('main'))

    console.log(hast)
  </script>

Now running open example.html prints the following to the console:

{type: "element", tagName: "main", properties: {}, children: Array}

API

This package exports the identifier fromDom. There is no default export.

`fromDom(tree, options?)`

Transform a DOM tree to a hast tree.

Parameters

tree (DomNode) — DOM tree to transform
options (Options, optional) — configuration

Returns

Equivalent hast node (HastNode).

`AfterTransform`

Callback called when each node is transformed (TypeScript type).

Parameters

domNode (DomNode) — DOM node that was handled
hastNode (HastNode) — corresponding hast node

Returns

Nothing.

`Options`

Configuration (TypeScript type).

Fields

afterTransform (AfterTransform, optional) — callback called when each node is transformed

Returns

HastNode.

Types

This package is fully typed with TypeScript. It exports the additional type Options.

Compatibility

Projects maintained by the unified collective are compatible with all maintained versions of Node.js. As of now, that is Node.js 12.20+, 14.14+, and 16.0+. Our projects sometimes work with older versions, but this is not guaranteed.

Security

Use of hast-util-from-dom itself is safe but see other utilities for more information on potential security problems.

Contribute

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, organisation, or community you agree to abide by its terms.

hast-util-from-html — parse hast from a string of HTML
hast-util-sanitize — sanitize hast nodes
hast-util-to-html — serialize hast as HTML
hast-util-to-dom — create DOM trees from hast