Migrate to ESLint's flat config

biome.jsonc

@@ -12,9 +12,6 @@
             "filenameCases": ["kebab-case"]
           }
         }
-      },
-      "suspicious": {
-        "noExplicitAny": "off"
       }
     }
   },

.eslintrc.cjs → eslint.config.js

@@ -1,5 +1,5 @@
 /**
- * Copyright 2019, SumUp Ltd.
+ * Copyright 2025, SumUp Ltd.
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
@@ -13,8 +13,24 @@
  * limitations under the License.
  */
 
-module.exports = require('./dist/eslint')({
-  rules: {
-    'no-process-exit': 'off',
+import { configs } from './dist/eslint.js';
+
+export default [
+  configs.ignore,
+  configs.javascript,
+  configs.typescript,
+  configs.node,
+  configs.openSource,
+  {
+    languageOptions: {
+      parserOptions: {
+        projectService: true,
+        tsconfigRootDir: import.meta.dirname,
+      },
+    },
+    rules: {
+      'n/no-process-exit': 'off',
+      'n/hashbang': 'off',
+    },
   },
-});
+];