markdown/no-reference-like-urls

[the guide](guide) links to a file called guide. If the document also defines [guide]: .., the author almost certainly meant [the guide][guide], with square brackets.

--fix changes the parentheses to brackets, unless the link has a title, which a reference can't have.

Configure

Off by default. It needs an ESLint config that says which files are in the language:

import markdown from "@eslint/markdown";

export default [
  {
    files: ["**/*.md"],
    plugins: { markdown },
    language: "markdown/commonmark",
    rules: { "markdown/no-reference-like-urls": "error" },
  },
];

It also works with markdown/gfm.

Examples

Reported:

Read [the guide](guide).

![The logo](logo)

[guide]: https://example.com/guide
[logo]: ./logo.png

Not reported:

Read [the guide][guide] or [the other guide](./guide.md).

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