test: Fix task runner tests on node 18 and 22 (n8n-io#12243)

packages/@n8n/task-runner/jest.config.js

@@ -1,5 +1,6 @@
 /** @type {import('jest').Config} */
 module.exports = {
 	...require('../../../jest.config'),
+	setupFilesAfterEnv: ['n8n-workflow/test/setup.ts'],
 	testTimeout: 10_000,
 };

packages/@n8n/task-runner/src/js-task-runner/errors/__tests__/execution-error.test.ts

@@ -36,7 +36,11 @@ describe('ExecutionError', () => {
 
 	it('should serialize correctly', () => {
 		const error = new Error('a.unknown is not a function');
-		error.stack = defaultStack;
+		Object.defineProperty(error, 'stack', {
+			value: defaultStack,
+			enumerable: true,
+		});
+		// error.stack = defaultStack;
 
 		const executionError = new ExecutionError(error, 1);
 

packages/@n8n/task-runner/src/js-task-runner/errors/execution-error.ts

@@ -10,8 +10,6 @@ export class ExecutionError extends SerializableError {
 
 	context: { itemIndex: number } | undefined = undefined;
 
-	stack = '';
-
 	lineNumber: number | undefined = undefined;
 
 	constructor(error: ErrorLike, itemIndex?: number) {
@@ -22,7 +20,12 @@ export class ExecutionError extends SerializableError {
 			this.context = { itemIndex: this.itemIndex };
 		}
 
-		this.stack = error.stack ?? '';
+		// Override the stack trace with the given error's stack trace. Since
+		// node v22 it's not writable, so we can't assign it directly
+		Object.defineProperty(this, 'stack', {
+			value: error.stack,
+			enumerable: true,
+		});
 
 		this.populateFromStack();
 	}
@@ -31,7 +34,7 @@ export class ExecutionError extends SerializableError {
 	 * Populate error `message` and `description` from error `stack`.
 	 */
 	private populateFromStack() {
-		const stackRows = this.stack.split('\n');
+		const stackRows = (this.stack ?? '').split('\n');
 
 		if (stackRows.length === 0) {
 			this.message = 'Unknown error';

packages/@n8n/task-runner/src/polyfills.ts

@@ -0,0 +1,5 @@
+// WebCrypto Polyfill for older versions of Node.js 18
+if (!globalThis.crypto?.getRandomValues) {
+	// eslint-disable-next-line @typescript-eslint/no-unsafe-assignment, @typescript-eslint/no-var-requires, @typescript-eslint/no-unsafe-member-access
+	globalThis.crypto = require('node:crypto').webcrypto;
+}

packages/@n8n/task-runner/src/start.ts

@@ -1,3 +1,4 @@
+import './polyfills';
 import type { ErrorReporter } from 'n8n-core';
 import { ensureError, setGlobalState } from 'n8n-workflow';
 import Container from 'typedi';