Support ESLint v9.0

[antfu]

The context interface has changed, and removed in v9.0. For example: https://eslint.org/blog/2023/09/preparing-custom-rules-eslint-v9/#context.getscope()

This plugin on ESLint v9.0.0-rc.0 will throw errors like:

I tried to check the codebase, but it seems the overall dependencies of this repo are still a bit left behind. Like @typescript-eslint/utils is still v5 while now it's v7 - some the we don't even have the compact types for the new APIs - I wonder what's the strategies of this repo, should we keep support eslint v7 and v8, or we could do a major that only support latest v8.40+ + v9?

[SukkaW]

I tried to check the codebase, but it seems the overall dependencies of this repo are still a bit left behind. Like @typescript-eslint/utils is still v5 while now it's v7

I've already attempted that yesterday. I tried to upgrade ts-eslint/utils from version 5 to version 6 but was unsuccessful. The migration needs to change tons of stuff.

[JounQin]

I'm personally fine with dropping legacy eslint versions, but https://github.com/ota-meshi/eslint-compat-utils can also be considered at the same time.

And also I want to upgrade tseslint related packages first, as @SukkaW described, it's not that easy, we need to adapt some rules internally.

[JounQin]

Please help to test eslint-plugin-import-x@0.4.2, while flat config is not officially supported yet, it is tracking at #29.

[JounQin]

@SukkaW See #66