remark-lint-no-heading-content-indent

remark-lint rule to warn when extra whitespace is used between hashes and content in headings.

Contents

• What is this?
• When should I use this?
• Presets
• Install
• Use
• API
  • unified().use(remarkLintNoHeadingContentIndent)
• Recommendation
• Fix
• Examples
• Compatibility
• Contribute
• License

What is this?

This package checks whitespace between hashes and content.

When should I use this?

You can use this package to check that headings are consistent.

Presets

This plugin is included in the following presets:

Preset	Options
remark-preset-lint-recommended

Install

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

1npm install remark-lint-no-heading-content-indent

In Deno with esm.sh:

1import remarkLintNoHeadingContentIndent from 'https://esm.sh/remark-lint-no-heading-content-indent@5'

In browsers with esm.sh:

1<script type="module">
2  import remarkLintNoHeadingContentIndent from 'https://esm.sh/remark-lint-no-heading-content-indent@5?bundle'
3</script>

Use

On the API:

1import remarkLint from 'remark-lint'
2import remarkLintNoHeadingContentIndent from 'remark-lint-no-heading-content-indent'
3import remarkParse from 'remark-parse'
4import remarkStringify from 'remark-stringify'
5import {read} from 'to-vfile'
6import {unified} from 'unified'
7import {reporter} from 'vfile-reporter'
8
9const file = await read('example.md')
10
11await unified()
12  .use(remarkParse)
13  .use(remarkLint)
14  .use(remarkLintNoHeadingContentIndent)
15  .use(remarkStringify)
16  .process(file)
17
18console.error(reporter(file))

On the CLI:

1remark --frail --use remark-lint --use remark-lint-no-heading-content-indent .

On the CLI in a config file (here a package.json):

1 …
2 "remarkConfig": {
3   "plugins": [
4     …
5     "remark-lint",
6+    "remark-lint-no-heading-content-indent",
7     …
8   ]
9 }
10 …

API

This package exports no identifiers. It exports no additional TypeScript types. The default export is remarkLintNoHeadingContentIndent.

unified().use(remarkLintNoHeadingContentIndent)

Warn when extra whitespace is used between hashes and content in headings.

Parameters

There are no options.

Returns

Transform (Transformer from unified).

Recommendation

One space is required and more than one space has no effect. Due to this, it’s recommended to turn this rule on.

Fix

remark-stringify formats headings with one space.

Examples

ok.md

In

1#␠Mercury
2
3##␠Venus␠##
4
5␠␠##␠Earth
6
7Setext headings are not affected:
8
9␠Mars
10=====
11
12␠Jupiter
13--------

Out

No messages.

not-ok.md

In

1#␠␠Mercury
2
3##␠Venus␠␠##
4
5␠␠##␠␠␠Earth

Out

11:4: Unexpected `2` spaces between hashes and content, expected `1` space, remove `1` space
23:11: Unexpected `2` spaces between content and hashes, expected `1` space, remove `1` space
35:8: Unexpected `3` spaces between hashes and content, expected `1` space, remove `2` spaces

empty-heading.md

In

1#␠␠

Out

11:4: Unexpected `2` spaces between hashes and content, expected `1` space, remove `1` space

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, remark-lint-no-heading-content-indent@5, compatible with Node.js 16.

Contribute

See contributing.md in remarkjs/.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