`no-unused-vars` error when using `eslint-plugin-mdx` without `eslint-plugin-react`.

### Initial checklist

- [X] I read the [support docs](https://mdxjs.com/community/support/)
- [X] I read the [contributing guide](https://mdxjs.com/community/contribute/)
- [X] I agree to follow the [code of conduct](https://github.com/mdx-js/.github/blob/HEAD/code-of-conduct.md)
- [X] I searched [issues](https://github.com/search?q=user%3Amdx-js&type=Issues) and couldn’t find anything (or linked relevant results below)

### Affected packages and versions

Latest

### Link to runnable example

https://stackblitz.com/edit/node-cppxmm?file=index.mdx

### Steps to reproduce

1. Open reproducible link
2. run `npx eslint ./index.mdx`


### Expected behavior

No error reported.

### Actual behavior


```
/home/projects/node-cppxmm/index.mdx
  1:8  error  'MyForm' is defined but never used  no-unused-vars
```

Enabling `eslint-plugin-react` would fix the error.

### Runtime

_No response_

### Package manager

_No response_

### OS

_No response_

### Build and bundle tools

_No response_

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Uh oh!

`no-unused-vars` error when using `eslint-plugin-mdx` without `eslint-plugin-react`. #444

Initial checklist

Affected packages and versions

Link to runnable example

Steps to reproduce

Expected behavior

Actual behavior

Runtime

Package manager

OS

Build and bundle tools

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

Uh oh!

no-unused-vars error when using eslint-plugin-mdx without eslint-plugin-react. #444

Description

Initial checklist

Affected packages and versions

Link to runnable example

Steps to reproduce

Expected behavior

Actual behavior

Runtime

Package manager

OS

Build and bundle tools

Metadata

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

Issue actions

`no-unused-vars` error when using `eslint-plugin-mdx` without `eslint-plugin-react`. #444