What counts as “supported”? eslint-plugin-simple-import-sort is currently marked as “❌ Not supported; no issue filed”. I got curious and tried to use it with this flat config:

import simpleImportSort from "eslint-plugin-simple-import-sort";

export default [
  {
    plugins: {
      "simple-import-sort": simpleImportSort,
    },
    rules: {
      "simple-import-sort/imports": "error",
      "simple-import-sort/exports": "error",
    }
  }
];

It worked! What does it take to earn the precious ✅ emoji?

@lydell in your case you're pretty close already because the plugin provides no configs, no processors, no globals, etc. Your plugin will "just work" in flat configs because of that.

The only thing you're really missing is plugin metadata: https://eslint.org/docs/latest/extend/plugin-migration-flat-config#adding-plugin-meta-information

This is great! Here's a couple more:

• eslint-plugin-jsdoc: has flat support
• eslint-plugin-regexp: has an issue

xo does not support it yet: xojs/xo#702

@lydell

What counts as “supported”?

Another level of "support" is for the ESLint plugin packages to have TypeScript types. I intend to have type-safe ESLint flat config in my projects, and many ESLint plugins currently don't publish types for their exports, because before flat config it was ESLint that was importing the modules, instead of consumers in their projects. Some plugin packages that export types are broken for TypeScript in nodenext mode, which should be the gold standard for determining the status of TypeScript support since it's the only mode that actually reflects how CJS and ESM interop in current Node.js versions (as well as modern bundlers) actually works.

It would be great if the tracking table in this issue description were to have another status column for TypeScript support.

Thanks a great idea @jaydenseric, adding now! (sorry for the delay)

I'm also adding @types/eslint, as that will need to be updated to have the new types too.

Hi, I created a PR to support flat config at eslint-plugin-mocha repository:

lo1tuma/eslint-plugin-mocha#349

EDIT: The PR was merged and shipped as eslint-plugin-mocha 10.4.0.

Would be good to get eslint-community/eslint-utils#183 / eslint-community/eslint-utils#186 in there as well, as it may be a blocker for quite a few other modules

Can eslint-plugin-i be added to the list? With 136k weekly downloads, I think it easily qualifies as popular. It being a soft for of eslint-plugin-import likely means it won't gain support before it, but it is good to track, I opened un-ts/eslint-plugin-import-x#29 there.

Here's a PR for flat config support in the import plugin: import-js/eslint-plugin-import#3018

This has been merged, pending release

Per #18087 (comment), it looks like the context.sessionis*Ignored APIs it depends on aren't landing? So unless I'm mistaken, eslint-plugin-import is blocked from flat config support still?

Here's a PR for flat config support in the import plugin: import-js/eslint-plugin-import#3018

This has been merged, pending release

Per #18087 (comment), it looks like the context.sessionis*Ignored APIs it depends on aren't landing? So unless I'm mistaken, eslint-plugin-import is blocked from flat config support still?

That'll ultimately be up to @ljharb. As I found here import-js/eslint-plugin-import#3018 (comment) the plugin still works without that implemented (even the impacted no-unused-modules rule). Adding that implementation was more about dealing with the situation when FileEnumerator is removed entirely (v10 I guess?). IMHO it'd still be valuable to release flat config support, even if there were an asterisk on that one rule. But that'll be up to him.

Yes, I'm fine doing that - we won't support eslint 10 until it's out and we test on it anyways, and people shouldn't be upgrading eslint until their plugins all support it :-)

eslint-plugin-import v2.30.0 should now have flat config support.

For my understanding, eslint-plugin-import has flat config support but not ESLint v9 compatibility yet, is that correct?

For my understanding, eslint-plugin-import has flat config support but not ESLint v9 compatibility yet, is that correct?

That's right. There's a draft pr for v9 support here, if you want to follow or participate import-js/eslint-plugin-import#2996

eslint-config-biome isn't on the list yet. Docs claim flat config support but doesn't look like it works yet.

eslint-config-biome isn't on the list yet. Docs claim flat config support but doesn't look like it works yet.

I just updated with a fix on v1.8.3: b69ccd7f3606de74696aba2f83bc517be23ca3fa

@JoshuaKGoldberg

It seems that the issue link is incorrect for eslint-plugin-check-file

it must be updated from eslint-plugin-check-file/#614 to eslint-plugin-check-file/#41

storybook PR: storybookjs/eslint-plugin-storybook#156

Hi there, can I clarify whether Eslint 9 supports Vue3 with vite?

Vue or Vite have nothing to do with the ESLint version. eslint-plugin-vue however supports both Vue 3 and ESLint 9 and flat config, see its documentation.

• jsx-expressions PR: feat: add support for eslint v9 hluisson/eslint-plugin-jsx-expressions#19

• eslint-find-rules issue: Support for ESLint 9.x? sarbbottam/eslint-find-rules#351

• eslint-find-rules PR: feat: support for eslint v9 sarbbottam/eslint-find-rules#353

eslint-plugin-vue v9.29.0 was just released which adds TypeScript declarations to the exported configs.

storybook: eslint-plugin-storybook v0.10 supports flat config.

Jest issue for types

Types were added to the Jest plugin in https://github.com/jest-community/eslint-plugin-jest/releases/tag/v28.9.0

React Hooks PR merged: facebook/react#30774 (it's marked as supported already in v5, but v5 only added support for v9, but didn't add a flat version of the recommended config)