@docusaurus/eslint-plugin is not compatible with ESLint 9

[Zamiell]

Have you read the Contributing Guidelines on issues?

• I have read the Contributing Guidelines on issues.

Description

See this dependency: https://github.com/facebook/docusaurus/blob/main/packages/eslint-plugin/package.json#L24

This needs to be upgraded to max, or else satisfying the peer deps is impossible on ESLint 9.

• I'd be willing to fix this bug myself.

[slorber]

Thanks

I didn't have time to study the problem, but is the change retro-compatible and can be done in a minor?

@Josh-Cena you probably have an idea?

[Josh-Cena]

I haven't updated a plugin to ESLint v9 so I don't know if that would suffice, but so I hope. Does flat config require a new recommended config format?

[Zamiell]

Not sure.

[Josh-Cena]

For now, let's include v9 in the peer dep range, and then people can try it out. Worst case they would need to apply workarounds like they already do with other plugins like plugin-react-hooks. Once I become more informed about how shared flat configs work, we can make it a new entry point like many other plugins are doing, and none of these changes would be semver breaking.