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diff --git a/js/src/proxy/DeadObjectProxy.h b/js/src/proxy/DeadObjectProxy.h
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+++ b/js/src/proxy/DeadObjectProxy.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set ts=8 sts=2 et sw=2 tw=80:
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef proxy_DeadObjectProxy_h
+#define proxy_DeadObjectProxy_h
+
+#include "js/Proxy.h"
+
+namespace js {
+
+class ProxyObject;
+
+enum DeadObjectProxyFlags {
+  DeadObjectProxyIsCallable = 1 << 0,
+  DeadObjectProxyIsConstructor = 1 << 1,
+  DeadObjectProxyIsBackgroundFinalized = 1 << 2
+};
+
+class DeadObjectProxy : public BaseProxyHandler {
+ public:
+  explicit constexpr DeadObjectProxy() : BaseProxyHandler(&family) {}
+
+  /* Standard internal methods. */
+  virtual bool getOwnPropertyDescriptor(
+      JSContext* cx, JS::HandleObject wrapper, JS::HandleId id,
+      JS::MutableHandle<mozilla::Maybe<JS::PropertyDescriptor>> desc)
+      const override;
+  virtual bool defineProperty(JSContext* cx, JS::HandleObject wrapper,
+                              JS::HandleId id,
+                              JS::Handle<JS::PropertyDescriptor> desc,
+                              JS::ObjectOpResult& result) const override;
+  virtual bool ownPropertyKeys(JSContext* cx, JS::HandleObject wrapper,
+                               JS::MutableHandleIdVector props) const override;
+  virtual bool delete_(JSContext* cx, JS::HandleObject wrapper, JS::HandleId id,
+                       JS::ObjectOpResult& result) const override;
+  virtual bool getPrototype(JSContext* cx, JS::HandleObject proxy,
+                            JS::MutableHandleObject protop) const override;
+  virtual bool getPrototypeIfOrdinary(
+      JSContext* cx, JS::HandleObject proxy, bool* isOrdinary,
+      JS::MutableHandleObject protop) const override;
+  virtual bool preventExtensions(JSContext* cx, JS::HandleObject proxy,
+                                 JS::ObjectOpResult& result) const override;
+  virtual bool isExtensible(JSContext* cx, JS::HandleObject proxy,
+                            bool* extensible) const override;
+  virtual bool call(JSContext* cx, JS::HandleObject proxy,
+                    const JS::CallArgs& args) const override;
+  virtual bool construct(JSContext* cx, JS::HandleObject proxy,
+                         const JS::CallArgs& args) const override;
+
+  /* SpiderMonkey extensions. */
+  // BaseProxyHandler::enumerate will throw by calling ownKeys.
+  virtual bool nativeCall(JSContext* cx, JS::IsAcceptableThis test,
+                          JS::NativeImpl impl,
+                          const JS::CallArgs& args) const override;
+  virtual bool getBuiltinClass(JSContext* cx, JS::HandleObject proxy,
+                               ESClass* cls) const override;
+  virtual bool isArray(JSContext* cx, JS::HandleObject proxy,
+                       JS::IsArrayAnswer* answer) const override;
+  virtual const char* className(JSContext* cx,
+                                JS::HandleObject proxy) const override;
+  virtual JSString* fun_toString(JSContext* cx, JS::HandleObject proxy,
+                                 bool isToSource) const override;
+  virtual RegExpShared* regexp_toShared(JSContext* cx,
+                                        JS::HandleObject proxy) const override;
+
+  // Use the regular paths for private values
+  virtual bool useProxyExpandoObjectForPrivateFields() const override {
+    return false;
+  }
+
+  virtual bool isCallable(JSObject* obj) const override {
+    return flags(obj) & DeadObjectProxyIsCallable;
+  }
+  virtual bool isConstructor(JSObject* obj) const override {
+    return flags(obj) & DeadObjectProxyIsConstructor;
+  }
+
+  virtual bool finalizeInBackground(const JS::Value& priv) const override {
+    return priv.toInt32() & DeadObjectProxyIsBackgroundFinalized;
+  }
+
+  static const DeadObjectProxy singleton;
+  static const char family;
+
+ private:
+  static int32_t flags(JSObject* obj) { return GetProxyPrivate(obj).toInt32(); }
+};
+
+bool IsDeadProxyObject(const JSObject* obj);
+
+JS::Value DeadProxyTargetValue(JSObject* obj);
+
+JSObject* NewDeadProxyObject(JSContext* cx, JSObject* origObj = nullptr);
+
+} /* namespace js */
+
+#endif /* proxy_DeadObjectProxy_h */