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diff --git a/src/mongo/scripting/mozjs/valuewriter.h b/src/mongo/scripting/mozjs/valuewriter.h
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+++ b/src/mongo/scripting/mozjs/valuewriter.h
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+/**
+ * Copyright (C) 2015 MongoDB Inc.
+ *
+ * This program is free software: you can redistribute it and/or  modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * As a special exception, the copyright holders give permission to link the
+ * code of portions of this program with the OpenSSL library under certain
+ * conditions as described in each individual source file and distribute
+ * linked combinations including the program with the OpenSSL library. You
+ * must comply with the GNU Affero General Public License in all respects
+ * for all of the code used other than as permitted herein. If you modify
+ * file(s) with this exception, you may extend this exception to your
+ * version of the file(s), but you are not obligated to do so. If you do not
+ * wish to do so, delete this exception statement from your version. If you
+ * delete this exception statement from all source files in the program,
+ * then also delete it in the license file.
+ */
+
+#pragma once
+
+#include <jsapi.h>
+#include <string>
+
+#include "mongo/bson/bsonobj.h"
+
+namespace mongo {
+namespace mozjs {
+
+/**
+ * Writes C++ values out of JS Values
+ *
+ * depth is used to trap circular objects in js and prevent stack smashing
+ *
+ * originalBSON is a hack to keep integer types in their original type when
+ * they're read out, manipulated in js and saved back.
+ */
+class ValueWriter {
+public:
+    ValueWriter(JSContext* cx, JS::HandleValue value, int depth = 0);
+
+    BSONObj toBSON();
+
+    /**
+     * These coercions flow through JS::To_X. I.e. they can call toString() or
+     * toNumber()
+     */
+    std::string toString();
+    int type();
+    double toNumber();
+    int32_t toInt32();
+    int64_t toInt64();
+    bool toBoolean();
+
+    /**
+     * Writes the value into a bsonobjbuilder under the name in sd.
+     */
+    void writeThis(BSONObjBuilder* b, StringData sd);
+
+    void setOriginalBSON(BSONObj* obj);
+
+private:
+    /**
+     * Writes the object into a bsonobjbuilder under the name in sd.
+     */
+    void _writeObject(BSONObjBuilder* b, StringData sd, JS::HandleObject obj);
+
+    JSContext* _context;
+    JS::HandleValue _value;
+    int _depth;
+    BSONObj* _originalParent;
+};
+
+}  // namespace mozjs
+}  // namespace mongo