remark-lint-no-heading-indent

remark-lint rule to warn when headings are indented.

What is this?

This package checks the spaces before headings.

When should I use this?

You can use this rule to check markdown code style.

Presets

This plugin is not included in presets maintained here.

Install

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

npm install remark-lint-no-heading-indent

In Deno with esm.sh:

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

In browsers with esm.sh:

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

Use

On the API:

import remarkLint from 'remark-lint'
import remarkLintNoHeadingIndent from 'remark-lint-no-heading-indent'
import remarkParse from 'remark-parse'
import remarkStringify from 'remark-stringify'
import {read} from 'to-vfile'
import {unified} from 'unified'
import {reporter} from 'vfile-reporter'

const file = await read('example.md')

await unified()
  .use(remarkParse)
  .use(remarkLint)
  .use(remarkLintNoHeadingIndent)
  .use(remarkStringify)
  .process(file)

console.error(reporter(file))

On the CLI:

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

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

 …
 "remarkConfig": {
   "plugins": [
     …
     "remark-lint",
+    "remark-lint-no-heading-indent",
     …
   ]
 }
 …

API

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

`unified().use(remarkLintNoHeadingIndent)`

Warn when headings are indented.

Parameters

There are no options.

Returns

Transform (Transformer from unified).

Recommendation

There is no specific handling of indented headings (or anything else) in markdown. While it is possible to use an indent to headings on their text:

   # Mercury
  ## Venus
 ### Earth
#### Mars

…such style is uncommon, a bit hard to maintain, and it’s impossible to add a heading with a rank of 5 as it would form indented code instead. So it’s recommended to not indent headings and to turn this rule on.

Fix

remark-stringify formats headings without indent.

Examples

`ok.md`

In

#␠Mercury

Venus
-----

#␠Earth␠#

Mars
====

Out

No messages.

`not-ok.md`

In

␠␠␠# Mercury

␠Venus
------

␠# Earth #

␠␠␠Mars
======

Out

1:4: Unexpected `3` spaces before heading, expected `0` spaces, remove `3` spaces
3:2: Unexpected `1` space before heading, expected `0` spaces, remove `1` space
6:2: Unexpected `1` space before heading, expected `0` spaces, remove `1` space
8:4: Unexpected `3` spaces before heading, expected `0` spaces, remove `3` spaces

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-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.

unified

Project: remarkjs/remark-lint

Package: remark-lint-no-heading-indent@4.1.1