LibJS: Add the Set built-in object

Author: https://github.com/IdanHo
Commit: 670be04c81
Pull-request: https://github.com/SerenityOS/serenity/pull/7928
Reviewed-by: https://github.com/linusg

Userland/Libraries/LibJS/Runtime/SetConstructor.h

@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) 2021, Idan Horowitz <idan.horowitz@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <LibJS/Runtime/NativeFunction.h>
+
+namespace JS {
+
+class SetConstructor final : public NativeFunction {
+    JS_OBJECT(SetConstructor, NativeFunction);
+
+public:
+    explicit SetConstructor(GlobalObject&);
+    virtual void initialize(GlobalObject&) override;
+    virtual ~SetConstructor() override;
+
+    virtual Value call() override;
+    virtual Value construct(Function&) override;
+
+private:
+    virtual bool has_constructor() const override { return true; }
+
+    JS_DECLARE_NATIVE_GETTER(symbol_species_getter);
+};
+
+}