chore: add test verifying namespace export support (#10751)

Author: SimenB

e2e/__tests__/__snapshots__/nativeEsm.test.ts.snap

@@ -10,7 +10,7 @@ Ran all test suites matching /native-esm.tla.test.js/i.
 
 exports[`on node ^12.16.0 || >=13.7.0 runs test with native ESM 1`] = `
 Test Suites: 1 passed, 1 total
-Tests:       16 passed, 16 total
+Tests:       17 passed, 17 total
 Snapshots:   0 total
 Time:        <<REPLACED>>
 Ran all test suites matching /native-esm.test.js/i.

e2e/native-esm/__tests__/native-esm.test.js

@@ -21,6 +21,7 @@ import staticImportedStatefulWithAnotherQuery from '../stateful.mjs?query=2';
 /* eslint-enable */
 import {double} from '../index';
 import defaultFromCjs, {namedFunction} from '../namedExport.cjs';
+import {bag} from '../namespaceExport.js';
 
 test('should have correct import.meta', () => {
   expect(typeof require).toBe('undefined');
@@ -151,3 +152,7 @@ test('supports file urls as imports', async () => {
 
   expect(dynamic.default).toBe(staticImportedStateful);
 });
+
+test('namespace export', () => {
+  expect(bag.double).toBe(double);
+});

e2e/native-esm/namespaceExport.js

@@ -0,0 +1,8 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+export * as bag from './index.js';