mdast-util-definitions

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[mdast][] utility to find definitions by identifier.

Contents

* What is this?
* When should I use this?
* Install
* Use
* API
* definitions(tree)
* GetDefinition
* Types
* Compatibility
* Security
* Related
* Contribute
* License

What is this?

This package is a tiny utility that lets you find definitions.

When should I use this?

This utility can be useful because definitions can occur after the things that
reference them.
It’s small and protects against prototype pollution.

Install

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

``sh
npm install mdast-util-definitions
`

In Deno with [esm.sh][esmsh]:

`js
import {definitions} from 'https://esm.sh/mdast-util-definitions@6'
`

In browsers with [esm.sh][esmsh]:

`html

`

Use

`js
import {definitions} from 'mdast-util-definitions'
import {fromMarkdown} from 'mdast-util-from-markdown'

const tree = fromMarkdown('[example]: https://example.com "Example"')

const definition = definitions(tree)

definition('example')
// => {type: 'definition', 'title': 'Example', …}

definition('foo')
// => undefined
`

API

This package exports the identifier [definitions][api-definitions].
There is no default export.

$3

Find definitions in tree.

Uses CommonMark precedence, which means that earlier definitions are
preferred over duplicate later definitions.

###### Parameters

* tree ([Node][node])
— tree to check

###### Returns

Getter ([GetDefinition][api-getdefinition]).

$3

Get a definition by identifier (TypeScript type).

###### Parameters

* identifier (string, optional)
— identifier of definition

###### Returns

Definition corresponding to identifier ([Definition][definition]) or
undefined.

Types

This package is fully typed with [TypeScript][].
It exports the additional type [GetDefinition][api-getdefinition].

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,
mdast-util-definitions@^6, compatible with Node.js 16.

Security

Use of mdast-util-definitions does not involve [hast][] or user content so
there are no openings for [cross-site scripting (XSS)][xss] attacks.
Additionally, safe guards are in place to protect against prototype poisoning.

Related

* unist-util-index
— index property values or computed keys to nodes

Contribute

See [contributing.md][contributing] in [syntax-tree/.github][health] 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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[downloads]: https://www.npmjs.com/package/mdast-util-definitions

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[chat]: https://github.com/syntax-tree/unist/discussions

[license]: license

[author]: https://wooorm.com

[npm]: https://docs.npmjs.com/cli/install

[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c

[esmsh]: https://esm.sh

[typescript]: https://www.typescriptlang.org

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

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

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

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

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

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

[definition]: https://github.com/syntax-tree/mdast#definition

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

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

[api-definitions]: #definitionstree

[api-getdefinition]: #getdefinition