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diff --git a/src/javascript/jsc/bindings/webcore/PromiseRejectionEvent.h b/src/javascript/jsc/bindings/webcore/PromiseRejectionEvent.h
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+/*
+* Copyright (C) 2017 Apple Inc. All rights reserved.
+*
+* 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 "Event.h"
+#include "JSValueInWrappedObject.h"
+
+namespace WebCore {
+
+class DOMPromise;
+
+class PromiseRejectionEvent final : public Event {
+    WTF_MAKE_ISO_ALLOCATED(PromiseRejectionEvent);
+public:
+    struct Init : EventInit {
+        RefPtr<DOMPromise> promise;
+        JSC::JSValue reason;
+    };
+
+    static Ref<PromiseRejectionEvent> create(const AtomString& type, const Init& initializer, IsTrusted isTrusted = IsTrusted::No)
+    {
+        return adoptRef(*new PromiseRejectionEvent(type, initializer, isTrusted));
+    }
+
+    virtual ~PromiseRejectionEvent();
+
+    DOMPromise& promise() const { return m_promise.get(); }
+    const JSValueInWrappedObject& reason() const { return m_reason; }
+
+    EventInterface eventInterface() const override { return PromiseRejectionEventInterfaceType; }
+
+private:
+    PromiseRejectionEvent(const AtomString&, const Init&, IsTrusted);
+
+    Ref<DOMPromise> m_promise;
+    JSValueInWrappedObject m_reason;
+};
+
+} // namespace WebCore