Bug: Cannot lint both inside and outside code blocks

[ehmicky]

Environment

ESLint version: 9.13.0
@eslint/markdown version: 6.2.1
Node version: 23.1.0
npm version: 10.9.0
Operating System: Ubuntu 24.04

Which language are you using?

commonmark

What did you do?

Configuration

// eslint.config.js
import markdown from '@eslint/markdown'

export default [
  {
    plugins: {
      markdown,
    },
  },
  {
    files: ['**/*.md'],
    processor: 'markdown/markdown',
    language: 'markdown/commonmark',
    rules: {
      'markdown/no-duplicate-headings': 'error',
    }
  },
  {
    files: ['**/*.md/*.js'],
    rules: {
      'no-undef': 'error',
    },
  },
]

Markdown file

This is test.md

# Title

# Title

```js
test
```

Actual behavior

$ ls
eslint.config.js  node_modules  package.json  package-lock.json  test.md
$ eslint

/home/ether/Desktop/try_eslint/test.md
  6:1  error  'test' is not defined  no-undef

✖ 1 problem (1 error, 0 warnings)

If I comment out the processor: 'markdown/markdown' line in my eslint.config.js, I get this instead:

$ eslint

/home/ether/Desktop/try_eslint/test.md
  3:1  error  Duplicate heading "Title" found  markdown/no-duplicate-headings

✖ 1 problem (1 error, 0 warnings)

What did you expect to happen?

I expect to get both linting errors at the same time.

What actually happened?

I either get linting applied to the contents outside of the code blocks, or inside of the code blocks, depending on whether processor is specified in my eslint.config.js.

Link to Minimal Reproducible Example

https://github.com/ehmicky/eslint-markdown-bug

Participation

• I am willing to submit a pull request for this issue.

Additional comments

No response

[nzakas]

This is a limitation of ESLint itself, not with this plugin. We're working on it:
eslint/eslint#14745

[ehmicky]

Hi @nzakas,

Thanks and sorry as I am realizing this is a duplicate of #276.

It seems like the above issue might take a little time to resolve. Are there any known workarounds in the meantime?

[nzakas]

The only workaround is to run ESLint twice, one with each configuration. That's what this repo does.

[ehmicky]

Thanks for your answer @nzakas.