1 files changed, 34 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/modules/module-environment.js b/js/src/jit-test/tests/modules/module-environment.js
new file mode 100644
index 0000000000..fc526cfdd7
--- /dev/null
+++ b/js/src/jit-test/tests/modules/module-environment.js
@@ -0,0 +1,34 @@
+// Test top-level module environment
+
+function testInitialEnvironment(source, expected) {
+    let module = parseModule(source);
+    let names = getModuleEnvironmentNames(module);
+    assertEq(names.length, expected.length);
+    expected.forEach(function(name) {
+        assertEq(names.includes(name), true);
+    });
+}
+
+// Non-exported bindings: only top-level functions are present in the
+// environment.
+testInitialEnvironment('', []);
+testInitialEnvironment('var x = 1;', []);
+testInitialEnvironment('let x = 1;', []);
+testInitialEnvironment("if (true) { let x = 1; }", []);
+testInitialEnvironment("if (true) { var x = 1; }", []);
+testInitialEnvironment('function x() {}', ['x']);
+testInitialEnvironment("class x { constructor() {} }", []);
+
+// Exported bindings must be present in the environment.
+testInitialEnvironment('export var x = 1;', ['x']);
+testInitialEnvironment('export let x = 1;', ['x']);
+testInitialEnvironment('export default function x() {};', ['x']);
+testInitialEnvironment('export default 1;', ['default']);
+testInitialEnvironment('export default function() {};', ['default']);
+testInitialEnvironment("export class x { constructor() {} }", ['x']);
+testInitialEnvironment('export default class x { constructor() {} };', ['x']);
+testInitialEnvironment('export default class { constructor() {} };', ['default']);
+
+// Imports: namespace imports are present.
+testInitialEnvironment('import { x } from "m";', []);
+testInitialEnvironment('import * as x from "m";', ['x']);