remark-lint-maximum-line-length

remark-lint rule to warn when lines are too long.

Contents

What is this?
When should I use this?
Presets
Install
Use
API
- unified().use(remarkLintMaximumLineLength[, options])
- Options
Recommendation
Examples
Compatibility
Contribute
License

What is this?

This package checks the length of lines.

When should I use this?

You can use this package to check that lines are within reason.

Presets

This plugin is included in the following presets:

Preset	Options
`remark-preset-lint-markdown-style-guide`	`80`

Install

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

npm install remark-lint-maximum-line-length

In Deno with esm.sh:

import remarkLintMaximumLineLength from 'https://esm.sh/remark-lint-maximum-line-length@4'

In browsers with esm.sh:

<script type="module">
  import remarkLintMaximumLineLength from 'https://esm.sh/remark-lint-maximum-line-length@4?bundle'
</script>

Use

On the API:

import remarkLint from 'remark-lint'
import remarkLintMaximumLineLength from 'remark-lint-maximum-line-length'
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(remarkLintMaximumLineLength)
  .use(remarkStringify)
  .process(file)

console.error(reporter(file))

On the CLI:

remark --frail --use remark-lint --use remark-lint-maximum-line-length .

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

 …
 "remarkConfig": {
   "plugins": [
     …
     "remark-lint",
+    "remark-lint-maximum-line-length",
     …
   ]
 }
 …

API

This package exports no identifiers. It exports the TypeScript type Options. The default export is remarkLintMaximumLineLength.

`unified().use(remarkLintMaximumLineLength[, options])`

Warn when lines are too long.

Nodes that cannot be wrapped are ignored, such as JSX, HTML, code (flow), definitions, headings, and tables.

When code (phrasing), images, and links start before the wrap, end after the wrap, and contain no whitespace, they are also ignored.

Parameters

options (Options or number, optional) — configuration

Returns

Transform (Transformer from unified).

`Options`

Configuration (TypeScript type).

Properties

size (number, default: 60) — preferred max size
stringLength ((value: string) => number, optional) — function to detect text size

Recommendation

Whether to wrap prose or not is a stylistic choice.

To better represent how long lines “look”, you can pass a stringLength function.

Examples

`ok.md`

In

Mercury mercury mercury mercury mercury mercury mercury mercury mercury mercury
mercury.

Mercury mercury mercury mercury mercury mercury mercury mercury mercury `mercury()`.

Mercury mercury mercury mercury mercury mercury mercury mercury mercury <https://localhost>.

Mercury mercury mercury mercury mercury mercury mercury mercury mercury [mercury](https://localhost).

Mercury mercury mercury mercury mercury mercury mercury mercury mercury ![mercury](https://localhost).

<div>Mercury mercury mercury mercury mercury mercury mercury mercury mercury</div>

[foo]: https://localhost/mercury/mercury/mercury/mercury/mercury/mercury/mercury/mercury

Out

No messages.

`not-ok.md`

When configured with 20.

In

Mercury mercury mercury
mercury.

Mercury mercury mercury `mercury()`.

Mercury mercury mercury <https://localhost>.

Mercury mercury mercury [m](example.com).

Mercury mercury mercury ![m](example.com).

`mercury()` mercury mercury mercury.

<https://localhost> mercury.

[m](example.com) mercury.

![m](example.com) mercury.

Mercury mercury ![m](example.com) mercury.

Out

1:24: Unexpected `23` character line, expected at most `20` characters, remove `3` characters
4:37: Unexpected `36` character line, expected at most `20` characters, remove `16` characters
6:45: Unexpected `44` character line, expected at most `20` characters, remove `24` characters
8:42: Unexpected `41` character line, expected at most `20` characters, remove `21` characters
10:43: Unexpected `42` character line, expected at most `20` characters, remove `22` characters
12:37: Unexpected `36` character line, expected at most `20` characters, remove `16` characters
14:29: Unexpected `28` character line, expected at most `20` characters, remove `8` characters
16:26: Unexpected `25` character line, expected at most `20` characters, remove `5` characters
18:27: Unexpected `26` character line, expected at most `20` characters, remove `6` characters
20:43: Unexpected `42` character line, expected at most `20` characters, remove `22` characters

`string-length-default.md`

When configured with 40.

In

水星是太陽系的八大行星中最小和最靠近太陽的行星。

Out

No messages.

`string-length-custom.md`

When configured with { size: 40, stringLength: [Function: stringWidth] }.

In

水星是太陽系的八大行星中最小和最靠近太陽的行星。

Out

1:25: Unexpected `48` character line, expected at most `40` characters, remove `8` characters

`long-autolinks-ok.md`

When configured with 20.

In

<https://localhost/mercury/>

<https://localhost/mercury/>
mercury.

Mercury
<https://localhost/mercury/>.

Mercury
<https://localhost/mercury/>
mercury.

Mercury
<https://localhost/mercury/>
mercury mercury.

Mercury mercury
<https://localhost/mercury/>
mercury mercury.

Out

No messages.

`long-autolinks-nok.md`

When configured with 20.

In

<https://localhost/mercury/> mercury.

Mercury <https://localhost/mercury/>.

Mercury
<https://localhost/mercury/> mercury.

Mercury <https://localhost/mercury/>
mercury.

Out

1:38: Unexpected `37` character line, expected at most `20` characters, remove `17` characters
6:38: Unexpected `37` character line, expected at most `20` characters, remove `17` characters

`ok.md`

When configured with 20.

In

👉 Note: this example uses frontmatter (remark-frontmatter).

---
description: Mercury mercury mercury mercury.
---

Out

No messages.

`ok.md`

When configured with 20.

In

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

| Mercury | Mercury | Mercury |
| ------- | ------- | ------- |

Out

No messages.

`ok.md`

When configured with 20.

In

👉 Note: this example uses math (remark-math).

$$
L = \frac{1}{2} \rho v^2 S C_L
$$

Out

No messages.

`ok.md`

When configured with 20.

In

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

export const description = 'Mercury mercury mercury mercury.'

{description}

Out

No messages.

`ok-mixed-line-endings.md`

When configured with 10.

In

0123456789␍␊0123456789␊01234␍␊01234␊

Out

No messages.

`not-ok-mixed-line-endings.md`

When configured with 10.

In

012345678901␍␊012345678901␊01234567890␍␊01234567890␊

Out

1:13: Unexpected `12` character line, expected at most `10` characters, remove `2` characters
2:13: Unexpected `12` character line, expected at most `10` characters, remove `2` characters
3:12: Unexpected `11` character line, expected at most `10` characters, remove `1` character
4:12: Unexpected `11` character line, expected at most `10` characters, remove `1` character

`not-ok.md`

When configured with '🌍'.

Out

1:1: Unexpected value `🌍` for `size`, expected `number`

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-maximum-line-length@4, 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

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