Update Convex with no payload to be just like convex with payload but without payload

apps/next/tests/integration/smoke.test.ts

@@ -0,0 +1,7 @@
+import { describe, expect, it } from 'vitest';
+
+describe('integration test harness', () => {
+  it('provides modern Node globals', () => {
+    expect(typeof globalThis.structuredClone).toBe('function');
+  });
+});