Migrates to Eslint's flat config

arcanis commented 4 months ago

What's the problem this PR addresses?

This lets us remove the Rushstack fix, and dogfood the VSCode SDK with the flat config (which is the only available config in Eslint 9). I would have migrated us to Eslint 9, but eslint-plugin-react isn't compatible yet.

How did you fix it?

Migrate to eslint.config.mjs.

Checklist

[x] I have read the Contributing Guide.

[x] I have set the packages that need to be released for my changes to be effective.

[x] I will check that all automated PR checks pass before the PR gets reviewed.

arcanis commented 4 months ago

Draft until #6219 is fixed.

clemyan commented 4 months ago

FYI, ESLint recently released the @eslint/compat package that patches v8 plugins for v9.

merceyz commented 3 months ago

@arcanis Should this have removed https://github.com/yarnpkg/berry/blob/d3695b1834f702675063c5d3ae45f0af6d8d3fa8/packages/acceptance-tests/.eslintrc.js as well?

yarnpkg / berry