mdast-util-heading-style

mdast utility to get the style of a heading.

Contents

• What is this?
• When should I use this?
• Install
• Use
• API
  • headingStyle(node[, relative])
  • Style
• Types
• Compatibility
• Security
• Related
• Contribute
• License

What is this?

This package is a tiny utility to figure out if a heading was written as ATX or as setext.

## ATX uses hashes

Setext uses an underline
------------------------

When should I use this?

Probably not a lot! It’s used in remark-lint.

Install

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

npm install mdast-util-heading-style

In Deno with esm.sh:

import {headingStyle} from 'https://esm.sh/mdast-util-heading-style@3'

In browsers with esm.sh:

<script type="module">
  import {headingStyle} from 'https://esm.sh/mdast-util-heading-style@3?bundle'
</script>

Use

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'

API

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

headingStyle(node[, relative])

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 node to check
• style (Style, optional) — relative style

Returns

Style (Style) if it can be inferred, undefined otherwise.

Style

Style of heading (TypeScript type).

Type

type Style = 'atx' | 'atx-closed' | 'setext'

Types

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

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-heading-style@^3, compatible with Node.js 16.

Security

Use of mdast-util-heading-style does not involve hast so there are no openings for cross-site scripting (XSS) attacks.

Related

• mdast-normalize-headings — make sure there is no more than a single top-level heading
• mdast-util-heading-range — use headings as ranges

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

License

MIT © Titus Wormer