remark-lint-first-heading-level

remark-lint rule to warn when the first heading has a level other than a specified value

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remark-lint-first-heading-level
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remark-lintmono rule to warn when the first heading has an unexpected rank.

Contents

*   [`unified().use(remarkLintFirstHeadingLevel[, config])`](#unifieduseremarklintfirstheadinglevel-config)

What is this?

This package is a unified (remark) plugin, specifically a remark-lint rule. Lint rules check markdown code style.

When should I use this?

You can use this package to check the heading rank of the first heading.

Presets

This rule is not included in a preset maintained here.

Install

This package is ESM onlyesm. In Node.js (version 12.20+, 14.14+, or 16.0+), install with npm:
npm install remark-lint-first-heading-level

In Deno with Skypack:
import remarkLintFirstHeadingLevel from 'https://cdn.skypack.dev/remark-lint-first-heading-level@3?dts'

In browsers with Skypack:
<script type="module">
  import remarkLintFirstHeadingLevel from 'https://cdn.skypack.dev/remark-lint-first-heading-level@3?min'
</script>

Use

On the API:
import {read} from 'to-vfile'
import {reporter} from 'vfile-reporter'
import {remark} from 'remark'
import remarkLint from 'remark-lint'
import remarkLintFirstHeadingLevel from 'remark-lint-first-heading-level'

main()

async function main() {
  const file = await remark()
    .use(remarkLint)
    .use(remarkLintFirstHeadingLevel)
    .process(await read('example.md'))

  console.error(reporter(file))
}

On the CLI:
remark --use remark-lint --use remark-lint-first-heading-level example.md

On the CLI in a config file (here a package.json):
…
"remarkConfig": {
  "plugins": [
    …
    "remark-lint",
+    "remark-lint-first-heading-level",
    …
  ]
}
…

API

This package exports no identifiers. The default export is remarkLintFirstHeadingLevel.

unified().use(remarkLintFirstHeadingLevel[, config])

This rule supports standard configuration that all remark lint rules accept (such as false to turn it off or [1, options] to configure it).
The following options (default: 1) are accepted:
  • number (example 1)
— expected rank of first heading

Recommendation

In most cases you’d want to first heading in a markdown document to start at rank 1. In some cases a different rank makes more sense, such as when building a blog and generating the primary heading from frontmatter metadata, in which case a value of 2 can be defined here.

Examples

ok.md
When configured with 2.
In
## Delta

Paragraph.
Out
No messages.
ok-html.md
When configured with 2.
In
<h2>Echo</h2>

Paragraph.
Out
No messages.
not-ok.md
When configured with 2.
In
# Foxtrot

Paragraph.
Out
1:1-1:10: First heading level should be `2`
not-ok-html.md
When configured with 2.
In
<h1>Golf</h1>

Paragraph.
Out
1:1-1:14: First heading level should be `2`
ok.md
In
# The default is to expect a level one heading
Out
No messages.
ok-html.md
In
<h1>An HTML heading is also seen by this rule.</h1>
Out
No messages.
ok-delayed.md
In
You can use markdown content before the heading.

<div>Or non-heading HTML</div>

<h1>So the first heading, be it HTML or markdown, is checked</h1>
Out
No messages.
not-ok.md
In
## Bravo

Paragraph.
Out
1:1-1:9: First heading level should be `1`
not-ok-html.md
In
<h2>Charlie</h2>

Paragraph.
Out
1:1-1:17: First heading level should be `1`

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.

Contribute

See contributing.mdcontributing in remarkjs/.githubhealth for ways to get started. See support.mdsupport for ways to get help.
This project has a code of conductcoc. By interacting with this repository, organization, or community you agree to abide by its terms.

License

MITlicense © Titus Wormerauthor