Everywhere: Hoist the Libraries folder to the top-level

Author: https://github.com/trflynn89
Commit: 93712b24bf
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/2256
Reviewed-by: https://github.com/sideshowbarker

Libraries/LibJS/Runtime/WeakRef.h

@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2021-2022, Idan Horowitz <idan.horowitz@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <LibJS/Runtime/GlobalObject.h>
+#include <LibJS/Runtime/Object.h>
+#include <LibJS/Runtime/WeakContainer.h>
+
+namespace JS {
+
+class WeakRef final
+    : public Object
+    , public WeakContainer {
+    JS_OBJECT(WeakRef, Object);
+    JS_DECLARE_ALLOCATOR(WeakRef);
+
+public:
+    static NonnullGCPtr<WeakRef> create(Realm&, Object&);
+    static NonnullGCPtr<WeakRef> create(Realm&, Symbol&);
+
+    virtual ~WeakRef() override = default;
+
+    auto const& value() const { return m_value; }
+
+    void update_execution_generation() { m_last_execution_generation = vm().execution_generation(); }
+
+    virtual void remove_dead_cells(Badge<Heap>) override;
+
+private:
+    explicit WeakRef(Object&, Object& prototype);
+    explicit WeakRef(Symbol&, Object& prototype);
+
+    virtual void visit_edges(Visitor&) override;
+
+    Variant<GCPtr<Object>, GCPtr<Symbol>, Empty> m_value;
+    u32 m_last_execution_generation { 0 };
+};
+
+}