ESLint 9 support

[loucyx]

Description

• Use ESLint flat config.
• Upgrade ESLint to version 9.
• Run eslint with this plugin enabled.
• An error context.getAncestors is not a function is shown because that API was deprecated.

Suggested Solution

Follow the following documentation from ESLint: https://eslint.org/docs/latest/use/migrate-to-9.0.0

[JamieMason]

Thanks @loucyx that would be great

[aeadedoyin]

Hi @JamieMason does this mean you are working it now?

[JamieMason]

I think @loucyx has everything they need there – I don't have any projects which have been upgraded to v9 so I haven't experienced that or have a project I'm using to test against, plus they have all the documentation on hand.

[loucyx]

I can try to create a PR here giving your plugin compatibility with ESLint 9, but other than that the consumers of your plugin can't use it in the latest version of ESLint because it uses deprecated APIs.

[JamieMason]

Thanks @loucyx, that's great. So that way anyone on ESLint 9 can use the next version of this plugin with your changes, and anyone still on older versions of ESLint can just stay on the current version of this plugin until they're ready.

[loucyx]

PR open here ☺️

[JamieMason]

Thanks a lot @loucyx 🎉 I will try to pick this up but it could be a week from now due to my availability.

[loucyx]

@JamieMason of course! Take all the time you need! 😄

[tiavina-mika]

Is there any news on this?

[JamieMason]

No news just yet, my spare time at the moment is focused on syncpack, once that settles I should have some more time.