mdast-normalize-headings

mdast utility to normalize heading depths.

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

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 16+), install with npm:

npm install mdast-util-normalize-headings

In Deno with esm.sh:

import {normalizeHeadings} from 'https://esm.sh/mdast-util-normalize-headings@4'

In browsers with esm.sh:

<script type="module">
  import {normalizeHeadings} from 'https://esm.sh/mdast-util-normalize-headings@4?bundle'
</script>

Use

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

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)`

Make sure that there is only one top-level heading in the document by adjusting headings depths accordingly.

Parameters

tree (Node) — tree to change

Returns

Nothing (undefined).

Types

This package is fully typed with TypeScript. It exports no additional types.

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-normalize-headings@^4, compatible with Node.js 16.

Security

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

remark-normalize-headings — remark plugin

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.