remark-lint-no-unused-definitions

remark-lint rule to warn when unreferenced definitions are used.

Contents

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

What is this?

This package checks that definitions are referenced.

When should I use this?

You can use this package to check definitions.

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:

 npm install remark-lint-no-unused-definitions

In Deno with esm.sh:

 import remarkLintNoUnusedDefinitions from 'https://esm.sh/remark-lint-no-unused-definitions@4'

In browsers with esm.sh:

 <script type="module">
  import remarkLintNoUnusedDefinitions from 'https://esm.sh/remark-lint-no-unused-definitions@4?bundle'
</script>

Use

On the API:

 import remarkLint from 'remark-lint'
import remarkLintNoUnusedDefinitions from 'remark-lint-no-unused-definitions'
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(remarkLintNoUnusedDefinitions)
  .use(remarkStringify)
  .process(file)

console.error(reporter(file))

On the CLI:

 remark --frail --use remark-lint --use remark-lint-no-unused-definitions .

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

  …
 "remarkConfig": {
   "plugins": [
     …
     "remark-lint",
+    "remark-lint-no-unused-definitions",
     …
   ]
 }
 …

API

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

unified().use(remarkLintNoUnusedDefinitions)

Warn when unreferenced definitions are used.

Parameters

There are no options.

Returns

Transform (Transformer from unified).

Recommendation

Unused definitions do not contribute anything, so they can be removed.

Examples

ok.md

In

 [Mercury][]

[mercury]: https://example.com/mercury/

Out

No messages.

not-ok.md

In

 [mercury]: https://example.com/mercury/

Out

 1:1-1:40: Unexpected unused definition, expected no definition or one or more references to `mercury`

gfm.md

In

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

 Mercury[^mercury] is a planet.

[^Mercury]:
    **Mercury** is the first planet from the Sun and the smallest
    in the Solar System.
[^Venus]:
    **Venus** is the second planet from
    the Sun.

Out

 6:1-8:13: Unexpected unused footnote definition, expected no definition or one or more footnote references to `venus`

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-unused-definitions@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