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30-seconds-of-code/node_modules/mdast-util-definitions/readme.md
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# mdast-util-definitions
[![Build][build-badge]][build]
[![Coverage][coverage-badge]][coverage]
[![Downloads][downloads-badge]][downloads]
[![Size][size-badge]][size]
[![Sponsors][sponsors-badge]][collective]
[![Backers][backers-badge]][collective]
[![Chat][chat-badge]][chat]
[**mdast**][mdast] utility to get definitions by `identifier`.
Supports funky keys, like `__proto__` or `toString`.
## Install
[npm][]:
```sh
npm install mdast-util-definitions
```
## Usage
```js
var remark = require('remark')
var definitions = require('mdast-util-definitions')
var ast = remark().parse('[example]: https://example.com "Example"')
var definition = definitions(ast)
definition('example')
// => {type: 'definition', 'title': 'Example', ...}
definition('foo')
// => null
```
## API
### `definitions(node[, options])`
Create a cache of all [definition][]s in [`node`][node].
###### `options.commonmark`
`boolean`, default: false — Turn on to use CommonMark precedence: ignore
definitions found later for duplicate definitions.
The default behaviour is to prefer the last found definition.
###### Returns
[`Function`][fn-definition]
### `definition(identifier)`
###### Parameters
* `identifier` (`string`) — [Identifier][] of [definition][].
###### Returns
[`Node?`][node] — [Definition][], if found.
## 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, organisation, or community you agree to
abide by its terms.
## License
[MIT][license] © [Titus Wormer][author]
<!-- Definitions -->
[build-badge]: https://img.shields.io/travis/syntax-tree/mdast-util-definitions.svg
[build]: https://travis-ci.org/syntax-tree/mdast-util-definitions
[coverage-badge]: https://img.shields.io/codecov/c/github/syntax-tree/mdast-util-definitions.svg
[coverage]: https://codecov.io/github/syntax-tree/mdast-util-definitions
[downloads-badge]: https://img.shields.io/npm/dm/mdast-util-definitions.svg
[downloads]: https://www.npmjs.com/package/mdast-util-definitions
[size-badge]: https://img.shields.io/bundlephobia/minzip/mdast-util-definitions.svg
[size]: https://bundlephobia.com/result?p=mdast-util-definitions
[sponsors-badge]: https://opencollective.com/unified/sponsors/badge.svg
[backers-badge]: https://opencollective.com/unified/backers/badge.svg
[collective]: https://opencollective.com/unified
[chat-badge]: https://img.shields.io/badge/join%20the%20community-on%20spectrum-7b16ff.svg
[chat]: https://spectrum.chat/unified/syntax-tree
[license]: license
[author]: https://wooorm.com
[npm]: https://docs.npmjs.com/cli/install
[contributing]: https://github.com/syntax-tree/.github/blob/master/contributing.md
[support]: https://github.com/syntax-tree/.github/blob/master/support.md
[coc]: https://github.com/syntax-tree/.github/blob/master/code-of-conduct.md
[mdast]: https://github.com/syntax-tree/mdast
[node]: https://github.com/syntax-tree/unist#node
[fn-definition]: #definitionidentifier
[definition]: https://github.com/syntax-tree/mdast#definition
[identifier]: https://github.com/syntax-tree/mdast#association