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diff --git a/src/bun.js/bindings/webcore/AbortSignal.h b/src/bun.js/bindings/webcore/AbortSignal.h
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+++ b/src/bun.js/bindings/webcore/AbortSignal.h
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+/*
+ * Copyright (C) 2017-2022 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. 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 "ContextDestructionObserver.h"
+#include "EventTarget.h"
+// #include "JSDOMPromiseDeferred.h"
+#include "JSValueInWrappedObject.h"
+#include <wtf/Function.h>
+#include <wtf/Ref.h>
+#include <wtf/RefCounted.h>
+#include <wtf/WeakPtr.h>
+
+namespace WebCore {
+
+class AbortAlgorithm;
+class ScriptExecutionContext;
+
+class AbortSignal final : public RefCounted<AbortSignal>, public EventTargetWithInlineData, private ContextDestructionObserver {
+    WTF_MAKE_ISO_ALLOCATED_EXPORT(AbortSignal, WEBCORE_EXPORT);
+
+public:
+    static Ref<AbortSignal> create(ScriptExecutionContext*);
+    WEBCORE_EXPORT ~AbortSignal();
+
+    static Ref<AbortSignal> abort(JSDOMGlobalObject&, ScriptExecutionContext&, JSC::JSValue reason);
+    static Ref<AbortSignal> timeout(ScriptExecutionContext&, uint64_t milliseconds);
+
+    static bool whenSignalAborted(AbortSignal&, Ref<AbortAlgorithm>&&);
+
+    void signalAbort(JSC::JSValue reason);
+    void signalFollow(AbortSignal&);
+
+    bool aborted() const { return m_aborted; }
+    const JSValueInWrappedObject& reason() const { return m_reason; }
+
+    bool hasActiveTimeoutTimer() const { return m_hasActiveTimeoutTimer; }
+    bool hasAbortEventListener() const { return m_hasAbortEventListener; }
+
+    using RefCounted::deref;
+    using RefCounted::ref;
+
+    using Algorithm = Function<void()>;
+    void addAlgorithm(Algorithm&& algorithm) { m_algorithms.append(WTFMove(algorithm)); }
+
+    bool isFollowingSignal() const { return !!m_followingSignal; }
+
+    void throwIfAborted(JSC::JSGlobalObject&);
+
+private:
+    enum class Aborted : bool { No,
+        Yes };
+    explicit AbortSignal(ScriptExecutionContext*, Aborted = Aborted::No, JSC::JSValue reason = JSC::jsUndefined());
+
+    void setHasActiveTimeoutTimer(bool hasActiveTimeoutTimer) { m_hasActiveTimeoutTimer = hasActiveTimeoutTimer; }
+
+    // EventTarget.
+    EventTargetInterface eventTargetInterface() const final { return AbortSignalEventTargetInterfaceType; }
+    ScriptExecutionContext* scriptExecutionContext() const final { return ContextDestructionObserver::scriptExecutionContext(); }
+    void refEventTarget() final { ref(); }
+    void derefEventTarget() final { deref(); }
+    void eventListenersDidChange() final;
+
+    bool m_aborted { false };
+    Vector<Algorithm> m_algorithms;
+    WeakPtr<AbortSignal> m_followingSignal;
+    JSValueInWrappedObject m_reason;
+    bool m_hasActiveTimeoutTimer { false };
+    bool m_hasAbortEventListener { false };
+};
+
+}