eslint-plugin-mdx doesn't seems to load .remarkrc.mjs

[JulianCataldo]

Initial checklist

• I read the support docs
• I read the contributing guide
• I agree to follow the code of conduct
• I searched issues and couldn’t find anything (or linked relevant results below)

Affected packages and versions

All latest

Link to runnable example

https://github.com/JulianCataldo/eslint-mdx-repro

Steps to reproduce

Hello!

Here is a minimal reproduction repository I've made to illustrate this issue:

https://github.com/JulianCataldo/eslint-mdx-repro

Steps to repro. are described in its README.

I've talked about it before here:
remarkjs/remark-lint#300

Was not quite sure were in the stack is the culprit (remark? eslint? eslint-mdx? cosmic-config?).

For now, creating a static config file (as YAML or JSON) seems to work fine, so ESLint is good with 100% ESMs remark plugins (through the MDX plugin).

But that means having to maintain two remark-lint config, one for MDX and one for MD.

Maybe I've overlooked something?

Many thanks :)

Expected behavior

.remarkrc.mjs loaded from both remark and eslint

Actual behavior

Module JS configs are not loaded by the ESLint plugin.

[JounQin]

https://github.com/davidtheclark/cosmiconfig#searchplaces

PR welcome to add this support at

eslint-mdx/packages/eslint-mdx/src/worker.ts

Lines 60 to 62 in a1998c7

	const explorer = cosmiconfig('remark', {
	packageProp: 'remarkConfig',
	})

[JounQin]

Maybe we should migrate to use unified-engine instead.