deps: cherry-pick 39d546a from upstream v8

deps/v8/AUTHORS

@@ -70,6 +70,7 @@ Felix Geisendörfer <haimuiba@gmail.com>
 Filipe David Manana <fdmanana@gmail.com>
 Franziska Hinkelmann <franziska.hinkelmann@gmail.com>
 Geoffrey Garside <ggarside@gmail.com>
+Gus Caplan <me@gus.host>
 Gwang Yoon Hwang <ryumiel@company100.net>
 Henrique Ferreiro <henrique.ferreiro@gmail.com>
 Hirofumi Mako <mkhrfm@gmail.com>

deps/v8/include/v8.h

@@ -2354,6 +2354,11 @@ class V8_EXPORT Value : public Data {
 
   bool IsWebAssemblyCompiledModule() const;
 
+  /**
+   * Returns true if the value is a Module Namespace Object.
+   */
+  bool IsModuleNamespaceObject() const;
+
   V8_WARN_UNUSED_RESULT MaybeLocal<Boolean> ToBoolean(
       Local<Context> context) const;
   V8_WARN_UNUSED_RESULT MaybeLocal<Number> ToNumber(

deps/v8/src/api.cc

@@ -3584,6 +3584,10 @@ bool Value::IsSetIterator() const {
 
 bool Value::IsPromise() const { return Utils::OpenHandle(this)->IsJSPromise(); }
 
+bool Value::IsModuleNamespaceObject() const {
+  return Utils::OpenHandle(this)->IsJSModuleNamespace();
+}
+
 MaybeLocal<String> Value::ToString(Local<Context> context) const {
   auto obj = Utils::OpenHandle(this);
   if (obj->IsString()) return ToApiHandle<String>(obj);

deps/v8/test/cctest/test-api.cc

@@ -27041,6 +27041,35 @@ TEST(ImportMeta) {
   CHECK(result->StrictEquals(Local<v8::Value>::Cast(v8::Utils::ToLocal(meta))));
 }
 
+TEST(GetModuleNamespace) {
+  LocalContext context;
+  v8::Isolate* isolate = context->GetIsolate();
+  v8::HandleScope scope(isolate);
+
+  Local<String> url = v8_str("www.google.com");
+  Local<String> source_text = v8_str("export default 5; export const a = 10;");
+  v8::ScriptOrigin origin(url, Local<v8::Integer>(), Local<v8::Integer>(),
+                          Local<v8::Boolean>(), Local<v8::Integer>(),
+                          Local<v8::Value>(), Local<v8::Boolean>(),
+                          Local<v8::Boolean>(), True(isolate));
+  v8::ScriptCompiler::Source source(source_text, origin);
+  Local<Module> module =
+      v8::ScriptCompiler::CompileModule(isolate, &source).ToLocalChecked();
+  module->InstantiateModule(context.local(), UnexpectedModuleResolveCallback)
+      .ToChecked();
+  module->Evaluate(context.local()).ToLocalChecked();
+
+  Local<Value> ns_val = module->GetModuleNamespace();
+  CHECK(ns_val->IsModuleNamespaceObject());
+  Local<Object> ns = ns_val.As<Object>();
+  CHECK(ns->Get(context.local(), v8_str("default"))
+            .ToLocalChecked()
+            ->StrictEquals(v8::Number::New(isolate, 5)));
+  CHECK(ns->Get(context.local(), v8_str("a"))
+            .ToLocalChecked()
+            ->StrictEquals(v8::Number::New(isolate, 10)));
+}
+
 TEST(GlobalTemplateWithDoubleProperty) {
   v8::Isolate* isolate = CcTest::isolate();
   v8::HandleScope handle_scope(isolate);

src/node_types.cc

@@ -34,6 +34,7 @@ namespace {
   V(SharedArrayBuffer)                                                        \
   V(Proxy)                                                                    \
   V(WebAssemblyCompiledModule)                                                \
+  V(ModuleNamespaceObject)                                                    \
 
 
 #define V(type) \

test/parallel/test-util-types.js

@@ -1,4 +1,4 @@
-// Flags: --harmony-bigint
+// Flags: --harmony-bigint --experimental-vm-modules
 /* global SharedArrayBuffer */
 'use strict';
 const common = require('../common');
@@ -126,3 +126,11 @@ for (const [ value, _method ] of [
     assert.deepStrictEqual(yup, expected[testedFunc]);
   }
 }
+
+(async () => {
+  const m = new vm.Module('');
+  await m.link(() => 0);
+  m.instantiate();
+  await m.evaluate();
+  assert.ok(types.isModuleNamespaceObject(m.namespace));
+})();