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diff --git a/Source/JavaScriptCore/runtime/JSModuleLoader.h b/Source/JavaScriptCore/runtime/JSModuleLoader.h
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+/*
+ * Copyright (C) 2015 Apple Inc. All Rights Reserved.
+ * Copyright (C) 2016 Yusuke Suzuki <utatane.tea@gmail.com>.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "JSObject.h"
+
+namespace JSC {
+
+class JSInternalPromise;
+class JSModuleNamespaceObject;
+class SourceCode;
+
+class JSModuleLoader : public JSNonFinalObject {
+private:
+    JSModuleLoader(VM&, Structure*);
+public:
+    typedef JSNonFinalObject Base;
+
+    enum Status {
+        Fetch = 1,
+        Instantiate,
+        Satisfy,
+        Link,
+        Ready,
+    };
+
+    static JSModuleLoader* create(ExecState* exec, VM& vm, JSGlobalObject* globalObject, Structure* structure)
+    {
+        JSModuleLoader* object = new (NotNull, allocateCell<JSModuleLoader>(vm.heap)) JSModuleLoader(vm, structure);
+        object->finishCreation(exec, vm, globalObject);
+        return object;
+    }
+
+    DECLARE_INFO;
+
+    static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
+    {
+        return Structure::create(vm, globalObject, prototype, TypeInfo(ObjectType, StructureFlags), info());
+    }
+
+    // APIs to control the module loader.
+    JSValue provide(ExecState*, JSValue key, Status, const SourceCode&);
+    JSInternalPromise* loadAndEvaluateModule(ExecState*, JSValue moduleName, JSValue referrer, JSValue scriptFetcher);
+    JSInternalPromise* loadModule(ExecState*, JSValue moduleName, JSValue referrer, JSValue scriptFetcher);
+    JSValue linkAndEvaluateModule(ExecState*, JSValue moduleKey, JSValue scriptFetcher);
+    JSInternalPromise* requestImportModule(ExecState*, const Identifier&, JSValue scriptFetcher);
+
+    // Platform dependent hooked APIs.
+    JSInternalPromise* importModule(ExecState*, JSString* moduleName, const SourceOrigin& referrer);
+    JSInternalPromise* resolve(ExecState*, JSValue name, JSValue referrer, JSValue scriptFetcher);
+    JSInternalPromise* fetch(ExecState*, JSValue key, JSValue scriptFetcher);
+    JSInternalPromise* instantiate(ExecState*, JSValue key, JSValue source, JSValue scriptFetcher);
+
+    // Additional platform dependent hooked APIs.
+    JSValue evaluate(ExecState*, JSValue key, JSValue moduleRecord, JSValue scriptFetcher);
+
+    // Utility functions.
+    JSModuleNamespaceObject* getModuleNamespaceObject(ExecState*, JSValue moduleRecord);
+
+protected:
+    void finishCreation(ExecState*, VM&, JSGlobalObject*);
+};
+
+} // namespace JSC