build: Update ESLint to v9 (#16639)

packages/@n8n/client-oauth2/.eslintrc.js

@@ -1,17 +0,0 @@
-const sharedOptions = require('@n8n/eslint-config/shared');
-
-/**
- * @type {import('@types/eslint').ESLint.ConfigData}
- */
-module.exports = {
-	extends: ['@n8n/eslint-config/base'],
-
-	...sharedOptions(__dirname),
-
-	rules: {
-		'unicorn/filename-case': ['error', { case: 'kebabCase' }],
-		'@typescript-eslint/consistent-type-imports': 'error',
-		'n8n-local-rules/no-plain-errors': 'off',
-		'n8n-local-rules/no-uncaught-json-parse': 'off',
-	},
-};

packages/@n8n/client-oauth2/eslint.config.mjs

@@ -0,0 +1,29 @@
+import { defineConfig } from 'eslint/config';
+import { baseConfig } from '@n8n/eslint-config/base';
+
+export default defineConfig(
+	baseConfig,
+	{
+		rules: {
+			'unicorn/filename-case': ['error', { case: 'kebabCase' }],
+			'@typescript-eslint/consistent-type-imports': 'error',
+			'n8n-local-rules/no-plain-errors': 'off',
+			'n8n-local-rules/no-uncaught-json-parse': 'off',
+
+			// TODO: Remove this
+			'@typescript-eslint/naming-convention': 'warn',
+			'@typescript-eslint/require-await': 'warn',
+		},
+	},
+	{
+		files: ['**/*.test.ts'],
+		rules: {
+			// TODO: Remove this
+			'id-denylist': 'warn',
+			'@typescript-eslint/no-unsafe-return': 'warn',
+			'@typescript-eslint/no-unsafe-call': 'warn',
+			'@typescript-eslint/no-unsafe-member-access': 'warn',
+			'@typescript-eslint/no-unsafe-assignment': 'warn',
+		},
+	},
+);