unified

Project: syntax-tree/mdast-normalize-headings

Package: mdast-normalize-headings@3.1.0

  1. Dependents: 0
  2. mdast utility to make sure there is no more than a single top-level heading in the document
  1. util 147
  2. utility 143
  3. unist 131
  4. mdast 86
  5. tree 44
  6. mdast-util 31
  7. heading 25
  8. depth 5
  9. level 5
  10. title 4
  11. count 4
  12. header 2

mdast-normalize-headings

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mdast utility to normalize heading depths.

Contents

What is this?

This package is a utility that normalizes the heading structure of documents. It makes sure one top-level heading is used by adjusting headings depths accordingly.

When should I use this?

This utility can be useful when working with tools that assume that there is a single top-level heading that contains some meta-information (usually a title) about the document.

A plugin, remark-normalize-headings, exists that does the same but for remark.

Install

This package is ESM only. In Node.js (version 12.20+, 14.14+, or 16.0+), install with npm:

npm install mdast-util-normalize-headings

In Deno with esm.sh:

import {normalizeHeadings} from 'https://esm.sh/mdast-util-normalize-headings@3'

In browsers with esm.sh:

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

Use

import {u} from 'unist-builder'
import {normalizeHeadings} from 'mdast-normalize-headings'

const tree = u('root', [
  u('heading', {depth: 1}, [u('text', 'title')]),
  u('heading', {depth: 2}, [u('text', 'description')]),
  u('heading', {depth: 1}, [u('text', 'example')])
])

normalizeHeadings(tree)

console.log(tree)

Yields:

{
  type: 'root',
  children: [
    {type: 'heading', depth: 1, children: [Array]},
    {type: 'heading', depth: 3, children: [Array]},
    {type: 'heading', depth: 2, children: [Array]}
  ]
}

API

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

normalizeHeadings(tree)

Normalize heading depths.

Returns

The given tree (Node).

Types

This package is fully typed with TypeScript. There are no additional exported types.

Compatibility

Projects maintained by the unified collective are compatible with all maintained versions of Node.js. As of now, that is Node.js 12.20+, 14.14+, and 16.0+. Our projects sometimes work with older versions, but this is not guaranteed.

Security

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

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 © Eugene Sharygin