LibJS: Add the Temporal.now namespace object

This will be home to various functions:

- Temporal.now.timeZone()
- Temporal.now.instant()
- Temporal.now.plainDateTime()
- Temporal.now.plainDateTimeISO()
- Temporal.now.zonedDateTime()
- Temporal.now.zonedDateTimeISO()
- Temporal.now.plainDate()
- Temporal.now.plainDateISO()
- Temporal.now.plainTimeISO()

Userland/Libraries/LibJS/CMakeLists.txt

@@ -121,6 +121,7 @@ set(SOURCES
     Runtime/SymbolConstructor.cpp
     Runtime/SymbolObject.cpp
     Runtime/SymbolPrototype.cpp
+    Runtime/Temporal/Now.cpp
     Runtime/Temporal/Temporal.cpp
     Runtime/TypedArray.cpp
     Runtime/TypedArrayConstructor.cpp

Userland/Libraries/LibJS/Runtime/Temporal/Now.cpp

@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2021, Linus Groh <linusg@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibJS/Runtime/GlobalObject.h>
+#include <LibJS/Runtime/Temporal/Now.h>
+
+namespace JS::Temporal {
+
+// 2 The Temporal.now Object, https://tc39.es/proposal-temporal/#sec-temporal-now-object
+Now::Now(GlobalObject& global_object)
+    : Object(*global_object.object_prototype())
+{
+}
+
+void Now::initialize(GlobalObject& global_object)
+{
+    Object::initialize(global_object);
+}
+
+}

Userland/Libraries/LibJS/Runtime/Temporal/Now.h

@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) 2021, Linus Groh <linusg@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <LibJS/Runtime/Object.h>
+
+namespace JS::Temporal {
+
+class Now final : public Object {
+    JS_OBJECT(Now, Object);
+
+public:
+    explicit Now(GlobalObject&);
+    virtual void initialize(GlobalObject&) override;
+    virtual ~Now() override = default;
+};
+
+}

Userland/Libraries/LibJS/Runtime/Temporal/Temporal.cpp

@@ -5,6 +5,7 @@
  */
 
 #include <LibJS/Runtime/GlobalObject.h>
+#include <LibJS/Runtime/Temporal/Now.h>
 #include <LibJS/Runtime/Temporal/Temporal.h>
 
 namespace JS::Temporal {
@@ -18,6 +19,11 @@ Temporal::Temporal(GlobalObject& global_object)
 void Temporal::initialize(GlobalObject& global_object)
 {
     Object::initialize(global_object);
+
+    auto& vm = this->vm();
+    u8 attr = Attribute::Writable | Attribute::Configurable;
+
+    define_direct_property(vm.names.now, heap().allocate<Now>(global_object, global_object), attr);
 }
 
 }