Update EsLint packages and other dependencies. Remove Next.js FlatConfig. Remove typescript-eslint (included by Next.js) (#400)

tooling/eslint/base.js

@@ -1,14 +1,12 @@
 import { defineConfig } from '@eslint/config-helpers';
 import eslint from '@eslint/js';
 import turbo from 'eslint-config-turbo';
-import tsEsLint from 'typescript-eslint';
 
-import nextConfig from './nextjs.js';
+import { nextEslintConfig, rules as nextjsEslintRules } from './nextjs.js';
 
 export default defineConfig(
   eslint.configs.recommended,
-  tsEsLint.configs.recommended,
-  nextConfig,
+  ...nextEslintConfig,
   {
     plugins: {
       turbo,
@@ -26,6 +24,8 @@ export default defineConfig(
   },
   {
     rules: {
+      ...nextjsEslintRules,
+      'no-undef': 'off',
       '@typescript-eslint/triple-slash-reference': 'off',
       'react/react-in-jsx-scope': 'off',
       'import/no-anonymous-default-export': 'off',

tooling/eslint/nextjs.js

@@ -1,17 +1,10 @@
-import { FlatCompat } from '@eslint/eslintrc';
+import nextCoreVitals from 'eslint-config-next/core-web-vitals';
+import nextTypescript from 'eslint-config-next/typescript';
 
-const compat = new FlatCompat({
-  baseDirectory: import.meta.dirname,
-});
+const nextEslintConfig = [...nextCoreVitals, ...nextTypescript];
 
-const nextEslintConfig = [
-  ...compat.config({
-    extends: ['next/core-web-vitals', 'next/typescript'],
-    rules: {
-      '@next/next/no-html-link-for-pages': 'off',
-      'no-undef': 'off',
-    },
-  }),
-];
+const rules = {
+  '@next/next/no-html-link-for-pages': 'off',
+};
 
-export default nextEslintConfig;
+export { nextEslintConfig, rules };

tooling/eslint/package.json

@@ -13,17 +13,14 @@
     "format": "prettier --check \"**/*.{js,json}\""
   },
   "dependencies": {
-    "@next/eslint-plugin-next": "16.0.0-beta.0",
+    "@next/eslint-plugin-next": "16.0.0",
     "@types/eslint": "9.6.1",
-    "eslint-config-next": "16.0.0-beta.0",
-    "eslint-config-turbo": "^2.5.8",
-    "typescript-eslint": "8.46.2"
+    "eslint-config-next": "16.0.0",
+    "eslint-config-turbo": "^2.5.8"
   },
   "devDependencies": {
     "@kit/prettier-config": "workspace:*",
-    "@kit/tsconfig": "workspace:*",
-    "eslint": "^9.38.0",
-    "typescript": "^5.9.3"
+    "eslint": "^9.38.0"
   },
   "prettier": "@kit/prettier-config"
 }