build: Update ESLint to v9 (#16639)

packages/core/.eslintrc.js

@@ -1,24 +0,0 @@
-const sharedOptions = require('@n8n/eslint-config/shared');
-
-/**
- * @type {import('@types/eslint').ESLint.ConfigData}
- */
-module.exports = {
-	extends: ['@n8n/eslint-config/node'],
-
-	...sharedOptions(__dirname),
-
-	parserOptions: {
-		project: './tsconfig.json',
-	},
-
-	ignorePatterns: ['bin/*.js', 'nodes-testing/*.ts'],
-
-	rules: {
-		complexity: 'error',
-		'unicorn/filename-case': ['error', { case: 'kebabCase' }],
-
-		// TODO: Remove this
-		'@typescript-eslint/ban-ts-comment': ['error', { 'ts-ignore': true }],
-	},
-};

packages/core/eslint.config.mjs

@@ -0,0 +1,46 @@
+import { defineConfig, globalIgnores } from 'eslint/config';
+import { nodeConfig } from '@n8n/eslint-config/node';
+
+export default defineConfig(
+	nodeConfig,
+	globalIgnores(['bin/*.js', 'nodes-testing/*.ts']),
+	{
+		rules: {
+			// TODO: Lower the complexity threshold
+			complexity: ['error', 27],
+			'unicorn/filename-case': ['error', { case: 'kebabCase' }],
+
+			// TODO: Remove these
+			'no-prototype-builtins': 'warn',
+			'no-empty': 'warn',
+			'no-ex-assign': 'warn',
+			'no-useless-escape': 'warn',
+			'@typescript-eslint/no-require-imports': 'warn',
+			'@typescript-eslint/require-await': 'warn',
+			'@typescript-eslint/no-base-to-string': 'warn',
+			'@typescript-eslint/prefer-optional-chain': 'warn',
+			'@typescript-eslint/prefer-nullish-coalescing': 'warn',
+			'@typescript-eslint/no-empty-object-type': 'warn',
+			'@typescript-eslint/naming-convention': 'warn',
+			'@typescript-eslint/no-array-delete': 'warn',
+			'@typescript-eslint/no-unsafe-member-access': 'warn',
+		},
+	},
+	{
+		files: ['**/*.test.ts', '**/test/**/*.ts', '**/__test__/**/*.ts', '**/__tests__/**/*.ts'],
+		rules: {
+			// TODO: Remove these
+			'prefer-const': 'warn',
+			'import-x/no-duplicates': 'warn',
+			'import-x/no-default-export': 'warn',
+			'n8n-local-rules/no-uncaught-json-parse': 'warn',
+			'@typescript-eslint/no-unsafe-assignment': 'warn',
+			'@typescript-eslint/no-unsafe-argument': 'warn',
+			'@typescript-eslint/no-unsafe-call': 'warn',
+			'@typescript-eslint/no-unsafe-return': 'warn',
+			'@typescript-eslint/unbound-method': 'warn',
+			'@typescript-eslint/no-unused-expressions': 'warn',
+			'id-denylist': 'warn',
+		},
+	},
+);

packages/core/src/execution-engine/node-execution-context/supply-data-context.ts

@@ -31,7 +31,7 @@ import { constructExecutionMetaData } from './utils/construct-execution-metadata
 import { copyInputItems } from './utils/copy-input-items';
 import { getDeduplicationHelperFunctions } from './utils/deduplication-helper-functions';
 import { getFileSystemHelperFunctions } from './utils/file-system-helper-functions';
-// eslint-disable-next-line import/no-cycle
+// eslint-disable-next-line import-x/no-cycle
 import { getInputConnectionData } from './utils/get-input-connection-data';
 import { normalizeItems } from './utils/normalize-items';
 import { getRequestHelperFunctions } from './utils/request-helper-functions';

packages/core/src/execution-engine/node-execution-context/utils/get-input-connection-data.ts

@@ -29,7 +29,7 @@ import {
 
 import { createNodeAsTool } from './create-node-as-tool';
 import type { ExecuteContext, WebhookContext } from '../../node-execution-context';
-// eslint-disable-next-line import/no-cycle
+// eslint-disable-next-line import-x/no-cycle
 import { SupplyDataContext } from '../../node-execution-context/supply-data-context';
 
 function getNextRunIndex(runExecutionData: IRunExecutionData, nodeName: string) {