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diff --git a/src/mongo/scripting/mozjs/engine.h b/src/mongo/scripting/mozjs/engine.h
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+++ b/src/mongo/scripting/mozjs/engine.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 <unordered_map>
+
+#include "mongo/scripting/deadline_monitor.h"
+#include "mongo/scripting/engine.h"
+#include "mongo/stdx/mutex.h"
+#include "mongo/util/concurrency/mutex.h"
+
+namespace mongo {
+namespace mozjs {
+
+class MozJSImplScope;
+
+/**
+ * Implements the global ScriptEngine interface for MozJS.  The associated TU
+ * pulls this in for the polymorphic globalScriptEngine.
+ */
+class MozJSScriptEngine final : public mongo::ScriptEngine {
+public:
+    MozJSScriptEngine();
+    ~MozJSScriptEngine() override;
+
+    mongo::Scope* createScope() override;
+
+    void runTest() override {}
+
+    bool utf8Ok() const override {
+        return true;
+    }
+
+    void interrupt(unsigned opId) override;
+
+    void interruptAll() override;
+
+    void registerOperation(OperationContext* ctx, MozJSImplScope* scope);
+    void unregisterOperation(unsigned int opId);
+
+    using ScopeCallback = void (*)(Scope&);
+    ScopeCallback getScopeInitCallback() {
+        return _scopeInitCallback;
+    };
+
+    DeadlineMonitor<MozJSImplScope>& getDeadlineMonitor() {
+        return _deadlineMonitor;
+    }
+
+private:
+    std::string printKnownOps_inlock();
+
+    /**
+     * This mutex protects _opToScopeMap
+     */
+    stdx::mutex _globalInterruptLock;
+
+    using OpIdToScopeMap = std::unordered_map<unsigned, MozJSImplScope*>;
+    OpIdToScopeMap _opToScopeMap;  // map of mongo op ids to scopes (protected by
+                                   // _globalInterruptLock).
+
+    DeadlineMonitor<MozJSImplScope> _deadlineMonitor;
+};
+
+}  // namespace mozjs
+}  // namespace mongo