fix: nextjs eslint flat config compatibility

packages/eslint-config/next.js

@@ -1,40 +1,41 @@
-import { dirname } from "path";
-import { fileURLToPath } from "url";
-import { FlatCompat } from "@eslint/eslintrc";
+import nextPlugin from "@next/eslint-plugin-next";
+import reactPlugin from "eslint-plugin-react";
+import hooksPlugin from "eslint-plugin-react-hooks";
+import tseslint from "typescript-eslint";
+import js from "@eslint/js";
 
-const __filename = fileURLToPath(import.meta.url);
-const __dirname = dirname(__filename);
-
-const compat = new FlatCompat({
-  baseDirectory: __dirname,
-});
-
-export const nextConfig = [
-  {
-    ignores: [
-      "**/dist/**",
-      "**/build/**",
-      "**/out/**",
-      "**/coverage/**",
-      "**/.next/**",
-      "**/node_modules/**",
-      "**/.gitea/**",
-      "**/.changeset/**",
-      "**/.vercel/**",
-    ],
-  },
-  ...compat.extends("next/core-web-vitals", "next/typescript"),
+/**
+ * Mintel Next.js ESLint Configuration (Flat Config)
+ * 
+ * This configuration replaces the legacy 'eslint-config-next' which
+ * relies on @rushstack/eslint-patch and causes issues in ESLint 9.
+ */
+export const nextConfig = tseslint.config(
   {
+    plugins: {
+      "react": reactPlugin,
+      "react-hooks": hooksPlugin,
+      "@next/next": nextPlugin,
+    },
+    languageOptions: {
+      globals: {
+        // Add common browser/node globals if needed, 
+        // though usually handled by base configs
+      },
+    },
     rules: {
-      "@typescript-eslint/no-explicit-any": "off",
-      "@typescript-eslint/no-unused-vars": [
-        "warn",
-        { argsIgnorePattern: "^_" },
-      ],
-      "@typescript-eslint/no-require-imports": "off",
-      "prefer-const": "warn",
+      ...reactPlugin.configs.recommended.rules,
+      ...hooksPlugin.configs.recommended.rules,
+      ...nextPlugin.configs.recommended.rules,
+      ...nextPlugin.configs["core-web-vitals"].rules,
+      "react/react-in-jsx-scope": "off",
       "react/no-unescaped-entities": "off",
       "@next/next/no-img-element": "warn",
     },
-  },
-];
+    settings: {
+      react: {
+        version: "detect",
+      },
+    },
+  }
+);

packages/eslint-config/package.json

@@ -22,6 +22,8 @@
     "@eslint/js": "^9.39.2",
     "@next/eslint-plugin-next": "15.1.6",
     "eslint-config-next": "15.1.6",
+    "eslint-plugin-react": "^7.37.5",
+    "eslint-plugin-react-hooks": "^7.0.1",
     "typescript-eslint": "^8.54.0"
   }
 }

pnpm-lock.yaml

@@ -175,6 +175,12 @@ importers:
       eslint-config-next:
         specifier: 15.1.6
         version: 15.1.6(eslint@9.39.2(jiti@2.6.1))(typescript@5.9.3)
+      eslint-plugin-react:
+        specifier: ^7.37.5
+        version: 7.37.5(eslint@9.39.2(jiti@2.6.1))
+      eslint-plugin-react-hooks:
+        specifier: ^7.0.1
+        version: 7.0.1(eslint@9.39.2(jiti@2.6.1))
       typescript-eslint:
         specifier: ^8.54.0
         version: 8.54.0(eslint@9.39.2(jiti@2.6.1))(typescript@5.9.3)