mdast utility to get the style of a heading
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[mdast][] utility to get the style of a heading.
* What is this?
* When should I use this?
* Install
* Use
* API
* [headingStyle(node[, relative])](#headingstylenode-relative)
* Style
* Types
* Compatibility
* Security
* Related
* Contribute
* License
This package is a tiny utility to figure out if a heading was written as ATX or
as setext.
``markdownATX uses hashes
Setext uses an underline
------------------------
`
Probably not a lot!
It’s used in [remark-lint][remark-lint].
This package is [ESM only][esm].
In Node.js (version 16+), install with [npm][]:
`sh`
npm install mdast-util-heading-style
In Deno with [esm.sh][esmsh]:
`js`
import {headingStyle} from 'https://esm.sh/mdast-util-heading-style@3'
In browsers with [esm.sh][esmsh]:
`html`
`js
import {unified} from 'unified'
import {fromMarkdown} from 'mdast-util-from-markdown'
import {headingStyle} from 'mdast-util-heading-style'
headingStyle(fromMarkdown('# ATX').children[0]) // => 'atx'
headingStyle(fromMarkdown('# ATX #\n').children[0]) // => 'atx-closed'
headingStyle(fromMarkdown('ATX\n===').children[0]) // => 'setext'
headingStyle(fromMarkdown('### ATX').children[0]) // => undefined
headingStyle(fromMarkdown('### ATX').children[0], 'setext') // => 'setext'
`
This package exports the identifier [headingStyle][api-headingstyle].
There is no default export.
Get the heading style of a heading, optionally relative to a preferred
style.
This is because ATX headings with a depth of three or more could be
considered setext.
###### Parameters
* node ([Heading][heading])style
— heading node to check
* ([Style][api-style], optional)
— relative style
###### Returns
Style ([Style][api-style]) if it can be inferred, undefined otherwise.
Style of heading (TypeScript type).
###### Type
`ts`
type Style = 'atx' | 'atx-closed' | 'setext'
This package is fully typed with [TypeScript][].
It exports the additional type [Style][api-style].
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-heading-style@^3, compatible with Node.js 16.
Use of mdast-util-heading-style does not involve [hast][] so there are
no openings for [cross-site scripting (XSS)][xss] attacks.
* mdast-normalize-headings
— make sure there is no more than a single top-level heading
* mdast-util-heading-range
— use headings as ranges
See [contributing.md][contributing] in [syntax-tree/.github][health] forsupport.md`][support] for ways to get help.
ways to get started.
See [
This project has a [code of conduct][coc].
By interacting with this repository, organization, or community you agree to
abide by its terms.
[MIT][license] © [Titus Wormer][author]
[build-badge]: https://github.com/syntax-tree/mdast-util-heading-style/workflows/main/badge.svg
[build]: https://github.com/syntax-tree/mdast-util-heading-style/actions
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[coverage]: https://codecov.io/github/syntax-tree/mdast-util-heading-style
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[downloads]: https://www.npmjs.com/package/mdast-util-heading-style
[size-badge]: https://img.shields.io/badge/dynamic/json?label=minzipped%20size&query=$.size.compressedSize&url=https://deno.bundlejs.com/?q=mdast-util-heading-style
[size]: https://bundlejs.com/?q=mdast-util-heading-style
[sponsors-badge]: https://opencollective.com/unified/sponsors/badge.svg
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[collective]: https://opencollective.com/unified
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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
[heading]: https://github.com/syntax-tree/mdast#heading
[xss]: https://en.wikipedia.org/wiki/Cross-site_scripting
[hast]: https://github.com/syntax-tree/hast
[remark-lint]: https://github.com/remarkjs/remark-lint
[api-headingstyle]: #headingstylenode-relative
[api-style]: #style