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diff --git a/dom/promise/PromiseNativeHandler.h b/dom/promise/PromiseNativeHandler.h
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+++ b/dom/promise/PromiseNativeHandler.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 mozilla_dom_PromiseNativeHandler_h
+#define mozilla_dom_PromiseNativeHandler_h
+
+#include <functional>
+#include "js/TypeDecls.h"
+#include "js/Value.h"
+#include "mozilla/ErrorResult.h"
+#include "mozilla/Maybe.h"
+#include "nsISupports.h"
+
+namespace mozilla::dom {
+
+/*
+ * PromiseNativeHandler allows C++ to react to a Promise being
+ * rejected/resolved. A PromiseNativeHandler can be appended to a Promise using
+ * Promise::AppendNativeHandler().
+ */
+class PromiseNativeHandler : public nsISupports {
+ protected:
+  virtual ~PromiseNativeHandler() = default;
+
+ public:
+  MOZ_CAN_RUN_SCRIPT
+  virtual void ResolvedCallback(JSContext* aCx, JS::Handle<JS::Value> aValue,
+                                ErrorResult& aRv) = 0;
+
+  MOZ_CAN_RUN_SCRIPT
+  virtual void RejectedCallback(JSContext* aCx, JS::Handle<JS::Value> aValue,
+                                ErrorResult& aRv) = 0;
+};
+
+// This class is used to set C++ callbacks once a dom Promise a resolved or
+// rejected.
+class DomPromiseListener final : public PromiseNativeHandler {
+  NS_DECL_ISUPPORTS
+
+ public:
+  using CallbackTypeResolved =
+      std::function<void(JSContext*, JS::Handle<JS::Value>)>;
+  using CallbackTypeRejected = std::function<void(nsresult)>;
+
+  DomPromiseListener(CallbackTypeResolved&& aResolve,
+                     CallbackTypeRejected&& aReject);
+
+  void Clear();
+
+  void ResolvedCallback(JSContext* aCx, JS::Handle<JS::Value> aValue,
+                        ErrorResult& aRv) override;
+  void RejectedCallback(JSContext* aCx, JS::Handle<JS::Value> aValue,
+                        ErrorResult& aRv) override;
+
+ private:
+  ~DomPromiseListener();
+  CallbackTypeResolved mResolve;
+  CallbackTypeRejected mReject;
+};
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_PromiseNativeHandler_h