# hast-util-has-property

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[**hast**][hast] utility to check if an [*element*][element] has a
[*property*][property].

## Install

This package is [ESM only](https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c):
Node 12+ is needed to use it and it must be `import`ed instead of `require`d.

[npm][]:

```sh
npm install hast-util-has-property
```

## Use

```js
import {hasProperty} from 'hast-util-has-property'

hasProperty({type: 'text', value: 'alpha'}, 'bravo') // => false

hasProperty(
  {
    type: 'element',
    tagName: 'div',
    properties: {id: 'bravo'},
    children: []
  },
  'className'
) // => false

hasProperty(
  {
    type: 'element',
    tagName: 'div',
    properties: {id: 'charlie'},
    children: []
  },
  'id'
) // => true
```

## API

This package exports the following identifiers: `hasProperty`.
There is no default export.

### `hasProperty(node, name)`

Check if `node` is an [*element*][element] that has a `name`
[*property name*][property].

###### Parameters

*   `node` ([`Node`][node], optional) — [*Node*][node] to check
*   `name` (`string`) - [*Property name*][property]

###### Returns

`boolean` — Whether `node` is an [*element*][element] that has a `name`
[*property name*][property].

## Security

`hast-util-has-property` does not change the syntax tree so there are no
openings for [cross-site scripting (XSS)][xss] attacks.

## Related

*   [`hast-util-is-element`](https://github.com/syntax-tree/hast-util-is-element)
    — check if a node is a (certain) element
*   [`hast-util-is-body-ok-link`](https://github.com/rehypejs/rehype-minify/tree/HEAD/packages/hast-util-is-body-ok-link)
    — check if a node is “Body OK” link element
*   [`hast-util-is-conditional-comment`](https://github.com/rehypejs/rehype-minify/tree/HEAD/packages/hast-util-is-conditional-comment)
    — check if a node is a conditional comment
*   [`hast-util-is-css-link`](https://github.com/rehypejs/rehype-minify/tree/HEAD/packages/hast-util-is-css-link)
    — check if a node is a CSS link element
*   [`hast-util-is-css-style`](https://github.com/rehypejs/rehype-minify/tree/HEAD/packages/hast-util-is-css-style)
    — check if a node is a CSS style element
*   [`hast-util-embedded`](https://github.com/syntax-tree/hast-util-embedded)
    — check if a node is an embedded element
*   [`hast-util-heading`](https://github.com/syntax-tree/hast-util-heading)
    — check if a node is a heading element
*   [`hast-util-interactive`](https://github.com/syntax-tree/hast-util-interactive)
    — check if a node is interactive
*   [`hast-util-is-javascript`](https://github.com/rehypejs/rehype-minify/tree/HEAD/packages/hast-util-is-javascript)
    — check if a node is a JavaScript script element
*   [`hast-util-labelable`](https://github.com/syntax-tree/hast-util-labelable)
    — check whether a node is labelable
*   [`hast-util-phrasing`](https://github.com/syntax-tree/hast-util-phrasing)
    — check if a node is phrasing content
*   [`hast-util-script-supporting`](https://github.com/syntax-tree/hast-util-script-supporting)
    — check if a node is a script-supporting element
*   [`hast-util-sectioning`](https://github.com/syntax-tree/hast-util-sectioning)
    — check if a node is a sectioning element
*   [`hast-util-transparent`](https://github.com/syntax-tree/hast-util-transparent)
    — check if a node is a transparent element
*   [`hast-util-whitespace`](https://github.com/syntax-tree/hast-util-whitespace)
    — check if a node is inter-element whitespace

## Contribute

See [`contributing.md` in `syntax-tree/.github`][contributing] for ways to get
started.
See [`support.md`][support] for ways to get help.

This project has a [code of conduct][coc].
By interacting with this repository, organization, or community you agree to
abide by its terms.

## License

[MIT][license] © [Titus Wormer][author]

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[license]: license

[author]: https://wooorm.com

[contributing]: https://github.com/syntax-tree/.github/blob/HEAD/contributing.md

[support]: https://github.com/syntax-tree/.github/blob/HEAD/support.md

[coc]: https://github.com/syntax-tree/.github/blob/HEAD/code-of-conduct.md

[hast]: https://github.com/syntax-tree/hast

[node]: https://github.com/syntax-tree/hast#nodes

[element]: https://github.com/syntax-tree/hast#element

[property]: https://github.com/syntax-tree/hast#property-names

[xss]: https://en.wikipedia.org/wiki/Cross-site_scripting