Link to the code that reproduces this issue
https://github.com/nirnejak/nextjs-typescript-starter
To Reproduce
After setting up eslint-plugin-jsx-a11y with ESLint 9 in flat file configuration. Running the npm run lint or npx next lint gives the following error
Config "jsx-a11y/recommended": Key "plugins": Cannot redefine plugin "jsx-a11y".
The ESLint config file
import { dirname } from "path"
import { fileURLToPath } from "url"
import { FlatCompat } from "@eslint/eslintrc"
import globals from "globals"
import eslint from "@eslint/js"
import tseslint from "typescript-eslint"
import love from "eslint-config-love"
import nodePlugin from "eslint-plugin-n"
import pluginPromise from "eslint-plugin-promise"
import jsxA11y from "eslint-plugin-jsx-a11y"
import tailwind from "eslint-plugin-tailwindcss"
import eslintPluginPrettierRecommended from "eslint-plugin-prettier/recommended"
const compat = new FlatCompat({
baseDirectory: dirname(fileURLToPath(import.meta.url)),
})
export default tseslint.config(
{ files: ["**/*.{js,jsx,mjs,cjs,ts,tsx}"] },
{
languageOptions: {
parser: tseslint.parser,
parserOptions: {
projectService: true,
tsconfigRootDir: import.meta.dirname,
},
globals: globals.node,
sourceType: "module",
ecmaVersion: "latest",
},
},
eslint.configs.recommended,
tseslint.configs.recommended,
{ ...love, files: ["**/*.js", "**/*.ts"] },
{
...nodePlugin.configs["flat/recommended-script"],
rules: {
"n/no-missing-import": [
"error",
{
ignoreTypeImport: true,
tryExtensions: [".ts", ".tsx", ".js", ".jsx", ".json"],
},
],
},
},
pluginPromise.configs["flat/recommended"],
...compat.extends("next/core-web-vitals", "next"),
jsxA11y.flatConfigs.recommended,
...tailwind.configs["flat/recommended"],
eslintPluginPrettierRecommended
)
Current vs. Expected behavior
The linter show work, currently it's broken,
Provide environment information
Operating System:
Platform: darwin
Arch: arm64
Version: Darwin Kernel Version 24.2.0: Fri Dec 6 18:51:28 PST 2024; root:xnu-11215.61.5~2/RELEASE_ARM64_T8112
Available memory (MB): 8192
Available CPU cores: 8
Binaries:
Node: 22.11.0
npm: 10.9.0
Yarn: 4.4.0
pnpm: 9.15.0
Relevant Packages:
next: 15.1.1
eslint-config-next: 15.1.1
react: 19.0.0
react-dom: 19.0.0
typescript: 5.7.2
Next.js Config:
output: N/A
Which area(s) are affected? (Select all that apply)
Linting
Which stage(s) are affected? (Select all that apply)
Other (Deployed)
Additional context
The code works without configuring eslint-plugin-jsx-a11y
Link to the code that reproduces this issue
https://github.com/nirnejak/nextjs-typescript-starter
To Reproduce
After setting up
eslint-plugin-jsx-a11ywith ESLint 9 in flat file configuration. Running thenpm run lintornpx next lintgives the following errorThe ESLint config file
Current vs. Expected behavior
The linter show work, currently it's broken,
Provide environment information
Operating System: Platform: darwin Arch: arm64 Version: Darwin Kernel Version 24.2.0: Fri Dec 6 18:51:28 PST 2024; root:xnu-11215.61.5~2/RELEASE_ARM64_T8112 Available memory (MB): 8192 Available CPU cores: 8 Binaries: Node: 22.11.0 npm: 10.9.0 Yarn: 4.4.0 pnpm: 9.15.0 Relevant Packages: next: 15.1.1 eslint-config-next: 15.1.1 react: 19.0.0 react-dom: 19.0.0 typescript: 5.7.2 Next.js Config: output: N/AWhich area(s) are affected? (Select all that apply)
Linting
Which stage(s) are affected? (Select all that apply)
Other (Deployed)
Additional context
The code works without configuring
eslint-plugin-jsx-a11y