📈 Tracking: ESLint v9 support

[JoshuaKGoldberg]

📈 Tracking: ESLint v9 support

[nzakas]

As a note, we've now introduced a compatibility package for issues related to the ESLint v9 rule API changes.

[JamesHenry]

@robertIsaac @Snafuh we didn't revert the handling for v9 things, just the dependency there was causing issues by forcing some users onto v9 so as a quick fix we reverted just that piece. We are looking into making it a peer instead of a direct dependency, but apparently we had it as a direct in order to make yarn v1 happy in the past... Package manager fun and games as usual 😅

UPDATE: It is now a peer dependency, so we can class ESLint v9 support being there as of Nx 19.1.0

[JamesHenry]

angular-eslint v18 supports ESLint v9

[JoshuaKGoldberg]

@julienw that'd be a good one to include, but it doesn't yet support flat config: testing-library/eslint-plugin-testing-library#853. See #18093.

[Snafuh]

NX support was merged in nrwl/nx#24632. I think there is already an released version with v9 support as well.

[vincentbriglia]

add gund/eslint-plugin-deprecation#79 to the ones that need support and thanks for this list!

[JoshuaKGoldberg]

@vincentbriglia eslint-plugin-deprecation doesn't yet support flat config, so it's relegated to the other list: gund/eslint-plugin-deprecation#85

[pauliesnug]

v9 support was added to eslint-plugin-solid in solidjs-community/eslint-plugin-solid#140, with solidjs-community/eslint-plugin-solid#141 awaiting a peer dependency update

[julienw]

https://github.com/testing-library/eslint-plugin-testing-library might be a good one to track as well. Here is their bug about the migration: testing-library/eslint-plugin-testing-library#899

[yannbertrand]

A few more:

• i18n-json unmaintained for 2 years, issue referencing flat config support,
• chai-expect, issue referencing flat config support
• knex

[jeremymeng]

vscode-eslint extension support: microsoft/vscode-eslint#1644

[MikeMcC399]

• eslint-plugin-cypress now supports ESLint 9.x in release v3.2.0 through PR cypress-io/eslint-plugin-cypress#203.

• The README includes instructions for using release v3.2.0 with ESLint v7, v8 and v9.

• Thanks to the ESLint team for support regarding backwards compatibility of the API eslint/eslint.org#559!

• Work is on-going regarding flat config updates.

[robertIsaac]

NX support was merged in nrwl/nx#24632. I think there is already an released version with v9 support as well.

I'm not sure if they support eslint 9 or not because of nrwl/nx#25938

[a-schyja]

Here is another one that supports flat config:

• eslint-plugin-check-file