build: Update ESLint to v9 (#16639)

packages/@n8n/codemirror-lang/.eslintrc.cjs

@@ -1,12 +0,0 @@
-const sharedOptions = require('@n8n/eslint-config/shared');
-
-/**
- * @type {import('@types/eslint').ESLint.ConfigData}
- */
-module.exports = {
-	extends: ['@n8n/eslint-config/base'],
-
-	...sharedOptions(__dirname),
-
-	ignorePatterns: ['src/expressions/grammar*.ts'],
-};

packages/@n8n/codemirror-lang/eslint.config.mjs

@@ -0,0 +1,11 @@
+import { defineConfig, globalIgnores } from 'eslint/config';
+import { baseConfig } from '@n8n/eslint-config/base';
+
+export default defineConfig(baseConfig, globalIgnores(['src/expressions/grammar*.ts']), {
+	rules: {
+		// TODO: Remove this
+		'@typescript-eslint/naming-convention': 'warn',
+		'no-useless-escape': 'warn',
+		'@typescript-eslint/unbound-method': 'warn',
+	},
+});

packages/@n8n/codemirror-lang/package.json

@@ -22,8 +22,8 @@
     "generate": "pnpm generate:expressions:grammar && pnpm format",
     "build": "tsc -p tsconfig.build.json",
     "test": "jest",
-    "lint": "eslint . --ext .ts --quiet",
-    "lintfix": "eslint . --ext .ts --fix",
+    "lint": "eslint . --quiet",
+    "lintfix": "eslint . --fix",
     "format": "biome format --write src test",
     "format:check": "biome ci src test"
   },