remark-lint-no-duplicate-defined-urls

remark-lint rule to warn when URLs are defined multiple times.

Contents

• What is this?
• When should I use this?
• Presets
• Install
• Use
• API
  • unified().use(remarkLintNoDuplicateDefinedUrls[, config])
• Recommendation
• Examples
• Compatibility
• Contribute
• License

What is this?

This package is a unified (remark) plugin, specifically a remark-lint rule. Lint rules check markdown code style.

When should I use this?

You can use this package to check that URLs are defined once.

Presets

This rule is not included in a preset maintained here.

Install

This package is ESM only. In Node.js (version 12.20+, 14.14+, or 16.0+), install with npm:

npm install remark-lint-no-duplicate-defined-urls

In Deno with esm.sh:

import remarkLintNoDuplicateDefinedUrls from 'https://esm.sh/remark-lint-no-duplicate-defined-urls@2'

In browsers with esm.sh:

<script type="module">
  import remarkLintNoDuplicateDefinedUrls from 'https://esm.sh/remark-lint-no-duplicate-defined-urls@2?bundle'
</script>

Use

On the API:

import {read} from 'to-vfile'
import {reporter} from 'vfile-reporter'
import {remark} from 'remark'
import remarkLint from 'remark-lint'
import remarkLintNoDuplicateDefinedUrls from 'remark-lint-no-duplicate-defined-urls'

main()

async function main() {
  const file = await remark()
    .use(remarkLint)
    .use(remarkLintNoDuplicateDefinedUrls)
    .process(await read('example.md'))

  console.error(reporter(file))
}

On the CLI:

remark --use remark-lint --use remark-lint-no-duplicate-defined-urls example.md

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

 …
 "remarkConfig": {
   "plugins": [
     …
     "remark-lint",
+    "remark-lint-no-duplicate-defined-urls",
     …
   ]
 }
 …

API

This package exports no identifiers. The default export is remarkLintNoDuplicateDefinedUrls.

unified().use(remarkLintNoDuplicateDefinedUrls[, config])

This rule supports standard configuration that all remark lint rules accept (such as false to turn it off or [1, options] to configure it).

There are no options.

Recommendation

It’s likely a mistake when the same URL is defined with different identifiers.

Examples

ok.md

In

[alpha]: alpha.com
[bravo]: bravo.com

Out

No messages.

not-ok.md

In

[alpha]: alpha.com
[bravo]: alpha.com

Out

2:1-2:19: Do not use different definitions with the same URL (1:1)

Compatibility

Projects maintained by the unified collective are compatible with all maintained versions of Node.js. As of now, that is Node.js 12.20+, 14.14+, and 16.0+. Our projects sometimes work with older versions, but this is not guaranteed.

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