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diff --git a/src/base_object.h b/src/base_object.h
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+++ b/src/base_object.h
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+// Copyright Joyent, Inc. and other Node contributors.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to permit
+// persons to whom the Software is furnished to do so, subject to the
+// following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+// USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+#ifndef SRC_BASE_OBJECT_H_
+#define SRC_BASE_OBJECT_H_
+
+#if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
+
+#include "v8.h"
+
+namespace node {
+
+class Environment;
+
+class BaseObject {
+ public:
+  inline BaseObject(Environment* env, v8::Local<v8::Object> handle);
+  inline virtual ~BaseObject();
+
+  // Returns the wrapped object.  Returns an empty handle when
+  // persistent.IsEmpty() is true.
+  inline v8::Local<v8::Object> object();
+
+  // The parent class is responsible for calling .Reset() on destruction
+  // when the persistent handle is strong because there is no way for
+  // BaseObject to know when the handle goes out of scope.
+  // Weak handles have been reset by the time the destructor runs but
+  // calling .Reset() again is harmless.
+  inline v8::Persistent<v8::Object>& persistent();
+
+  inline Environment* env() const;
+
+  // The handle_ must have an internal field count > 0, and the first
+  // index is reserved for a pointer to this class. This is an
+  // implicit requirement, but Node does not have a case where it's
+  // required that MakeWeak() be called and the internal field not
+  // be set.
+  template <typename Type>
+  inline void MakeWeak(Type* ptr);
+
+  inline void ClearWeak();
+
+ private:
+  BaseObject();
+
+  template <typename Type>
+  static inline void WeakCallback(
+      const v8::WeakCallbackInfo<Type>& data);
+
+  v8::Persistent<v8::Object> persistent_handle_;
+  Environment* env_;
+};
+
+}  // namespace node
+
+#endif  // defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
+
+#endif  // SRC_BASE_OBJECT_H_