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diff --git a/dom/bindings/test/TestInterfaceMaplikeJSObject.h b/dom/bindings/test/TestInterfaceMaplikeJSObject.h
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+++ b/dom/bindings/test/TestInterfaceMaplikeJSObject.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_TestInterfaceMaplikeJSObject_h
+#define mozilla_dom_TestInterfaceMaplikeJSObject_h
+
+#include "nsWrapperCache.h"
+#include "nsCOMPtr.h"
+
+class nsPIDOMWindowInner;
+
+namespace mozilla {
+
+class ErrorResult;
+
+namespace dom {
+
+class GlobalObject;
+
+// Implementation of test binding for webidl maplike interfaces, using
+// primitives for key types and objects for value types.
+class TestInterfaceMaplikeJSObject final : public nsISupports,
+                                           public nsWrapperCache {
+ public:
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_WRAPPERCACHE_CLASS(TestInterfaceMaplikeJSObject)
+
+  explicit TestInterfaceMaplikeJSObject(nsPIDOMWindowInner* aParent);
+  nsPIDOMWindowInner* GetParentObject() const;
+  virtual JSObject* WrapObject(JSContext* aCx,
+                               JS::Handle<JSObject*> aGivenProto) override;
+  static already_AddRefed<TestInterfaceMaplikeJSObject> Constructor(
+      const GlobalObject& aGlobal, ErrorResult& rv);
+
+  // External access for testing internal convenience functions.
+  void SetInternal(JSContext* aCx, const nsAString& aKey,
+                   JS::Handle<JSObject*> aObject);
+  void ClearInternal();
+  bool DeleteInternal(const nsAString& aKey);
+  bool HasInternal(const nsAString& aKey);
+  void GetInternal(JSContext* aCx, const nsAString& aKey,
+                   JS::MutableHandle<JSObject*> aRetVal, ErrorResult& aRv);
+
+ private:
+  virtual ~TestInterfaceMaplikeJSObject() = default;
+  nsCOMPtr<nsPIDOMWindowInner> mParent;
+};
+
+}  // namespace dom
+}  // namespace mozilla
+
+#endif  // mozilla_dom_TestInterfaceMaplikeJSObject_h