remark-lint-no-consecutive-blank-lines

remark-lint rule to warn when multiple blank lines are used.

Contents

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

What is this?

This package checks the number of blank lines.

When should I use this?

You can use this package to check that there are no unneeded blank lines.

Presets

This plugin is included in the following presets:

| Preset | Options | | - | - | | remark-preset-lint-markdown-style-guide | |

Install

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

npm install remark-lint-no-consecutive-blank-lines

In Deno with esm.sh:

import remarkLintNoConsecutiveBlankLines from 'https://esm.sh/remark-lint-no-consecutive-blank-lines@5'

In browsers with esm.sh:

<script type="module">
  import remarkLintNoConsecutiveBlankLines from 'https://esm.sh/remark-lint-no-consecutive-blank-lines@5?bundle'
</script>

Use

On the API:

import remarkLint from 'remark-lint'
import remarkLintNoConsecutiveBlankLines from 'remark-lint-no-consecutive-blank-lines'
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(remarkLintNoConsecutiveBlankLines)
  .use(remarkStringify)
  .process(file)

console.error(reporter(file))

On the CLI:

remark --frail --use remark-lint --use remark-lint-no-consecutive-blank-lines .

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

 …
 "remarkConfig": {
   "plugins": [
     …
     "remark-lint",
+    "remark-lint-no-consecutive-blank-lines",
     …
   ]
 }
 …

API

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

unified().use(remarkLintNoConsecutiveBlankLines)

Warn when multiple blank lines are used.

Parameters

There are no options.

Returns

Transform (Transformer from unified).

Recommendation

More than one blank line has no effect between blocks.

Fix

remark-stringify adds exactly one blank line between any block. It has a join option to configure more complex cases.

Examples

ok.md

In

# Planets

Mercury.

Venus.

Out

No messages.

not-ok.md

In

# Planets


Mercury.



Venus.

Out

4:1: Unexpected `2` blank lines before node, expected up to `1` blank line, remove `1` blank line
8:1: Unexpected `3` blank lines before node, expected up to `1` blank line, remove `2` blank lines

initial.md

In

␊Mercury.

Out

2:1: Unexpected `1` blank line before node, expected `0` blank lines, remove `1` blank line

final-one.md

In

Mercury.␊

Out

No messages.

final-more.md

In

Mercury.␊␊

Out

1:9: Unexpected `1` blank line after node, expected `0` blank lines, remove `1` blank line

empty-document.md

Out

No messages.

block-quote.md

In

> Mercury.

Venus.

>
> Earth.
>

Out

6:3: Unexpected `1` blank line before node, expected `0` blank lines, remove `1` blank line
6:9: Unexpected `1` blank line after node, expected `0` blank lines, remove `1` blank line

directive.md

In

👉 Note: this example uses directives (remark-directive).

:::mercury
Venus.


Earth.
:::

Out

5:1: Unexpected `2` blank lines before node, expected up to `1` blank line, remove `1` blank line

footnote.md

In

👉 Note: this example uses GFM (remark-gfm).

[^x]:
    Mercury.

Venus.

[^y]:

    Earth.


    Mars.

Out

8:5: Unexpected `1` blank line before node, expected `0` blank lines, remove `1` blank line
11:5: Unexpected `2` blank lines before node, expected up to `1` blank line, remove `1` blank line

jsx.md

In

👉 Note: this example uses MDX (remark-mdx).

<Mercury>
  Venus.


  Earth.
</Mercury>

Out

5:3: Unexpected `2` blank lines before node, expected up to `1` blank line, remove `1` blank line

list.md

In

* Mercury.
* Venus.

***

* Mercury.

* Venus.

***

* Mercury.


* Venus.

Out

15:1: Unexpected `2` blank lines before node, expected up to `1` blank line, remove `1` blank line

list-item.md

In

* Mercury.
  Venus.

***

* Mercury.

  Venus.

***

* Mercury.


  Venus.

***

*
  Mercury.

Out

15:3: Unexpected `2` blank lines before node, expected up to `1` blank line, remove `1` blank line
20:3: Unexpected `1` blank line before node, expected `0` blank lines, remove `1` blank line

deep-block-quote.md

In

* > * > # Venus␊␊

Out

1:16: Unexpected `1` blank line after node, expected `0` blank lines, remove `1` blank line

deep-list-item.md

In

> * > * # Venus␊␊

Out

1:16: Unexpected `1` blank line after node, expected `0` blank lines, remove `1` blank line

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-consecutive-blank-lines@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