No monkey patching

Author: bendvc

packages/mrt-utilities/package.json

@@ -79,9 +79,6 @@
     "pretest": "tsc --noEmit -p test",
     "test": "c8 mocha --forbid-only \"test/**/*.test.ts\"",
     "test:agent": "mocha --forbid-only --reporter min \"test/**/*.test.ts\"",
-    "test:express5": "pnpm run test",
-    "test:express4": "NODE_OPTIONS=\"--require ./test/helpers/express4-alias.cjs\" pnpm run test",
-    "test:express:matrix": "pnpm run test:express5 && pnpm run test:express4",
     "test:watch": "mocha --watch \"test/**/*.test.ts\""
   },
   "dependencies": {

packages/mrt-utilities/test/helpers/express-versions.ts

@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2025, Salesforce, Inc.
+ * SPDX-License-Identifier: Apache-2
+ * For full license text, see the license.txt file in the repo root or http://www.apache.org/licenses/LICENSE-2.0
+ */
+
+import express5 from 'express';
+import {createRequire} from 'node:module';
+
+/*
+ * Load Express v4 via an npm alias so tests can run against v4 and v5
+ * in the same process without altering production imports.
+ */
+const require = createRequire(import.meta.url);
+const express4 = require('express4') as typeof express5;
+
+/*
+ * Export both versions for parameterized test suites.
+ */
+export const expressVersions = [
+  {label: 'express4', express: express4},
+  {label: 'express5', express: express5},
+];