1 files changed, 54 insertions, 0 deletions
diff --git a/src/bun.js/bindings/webcore/JSDOMCastThisValue.h b/src/bun.js/bindings/webcore/JSDOMCastThisValue.h
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index 000000000..d7028c4b5
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+++ b/src/bun.js/bindings/webcore/JSDOMCastThisValue.h
@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
+ * Copyright (C) 2003-2006, 2008-2009, 2013, 2016 Apple Inc. All rights reserved.
+ * Copyright (C) 2007 Samuel Weinig <sam@webkit.org>
+ * Copyright (C) 2009 Google, Inc. All rights reserved.
+ * Copyright (C) 2012 Ericsson AB. All rights reserved.
+ * Copyright (C) 2013 Michael Pruett <michael@68k.org>
+ *
+ * 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. AND ITS CONTRIBUTORS ``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 ITS 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 "JSDOMGlobalObject.h"
+
+namespace WebCore {
+
+enum class CastedThisErrorBehavior : uint8_t {
+    Throw,
+    ReturnEarly,
+    RejectPromise,
+    Assert,
+};
+
+template<class JSClass>
+JSClass* castThisValue(JSC::JSGlobalObject& lexicalGlobalObject, JSC::JSValue thisValue)
+{
+    auto& vm = JSC::getVM(&lexicalGlobalObject);
+    if constexpr (std::is_base_of_v<JSDOMGlobalObject, JSClass>)
+        return toJSDOMGlobalObject<JSClass>(vm, thisValue.isUndefinedOrNull() ? JSC::JSValue(&lexicalGlobalObject) : thisValue);
+    else
+        return JSC::jsDynamicCast<JSClass*>(thisValue);
+}
+
+}