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diff --git a/js/public/WeakMapPtr.h b/js/public/WeakMapPtr.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 js_WeakMapPtr_h
+#define js_WeakMapPtr_h
+
+#include "jstypes.h"
+
+#include "js/TypeDecls.h"
+
+class JS_PUBLIC_API JSTracer;
+
+namespace JS {
+
+// A wrapper around the internal C++ representation of SpiderMonkey WeakMaps,
+// usable outside the engine.
+//
+// The supported template specializations are enumerated in gc/WeakMapPtr.cpp.
+// If you want to use this class for a different key/value combination, add it
+// to the list and the compiler will generate the relevant machinery.
+template <typename K, typename V>
+class JS_PUBLIC_API WeakMapPtr {
+ public:
+  WeakMapPtr() : ptr(nullptr) {}
+  bool init(JSContext* cx);
+  bool initialized() { return ptr != nullptr; }
+  void destroy();
+  virtual ~WeakMapPtr() { MOZ_ASSERT(!initialized()); }
+  void trace(JSTracer* trc);
+
+  V lookup(const K& key);
+  bool put(JSContext* cx, const K& key, const V& value);
+  V removeValue(const K& key);
+
+ private:
+  void* ptr;
+
+  // WeakMapPtr is neither copyable nor assignable.
+  WeakMapPtr(const WeakMapPtr& wmp) = delete;
+  WeakMapPtr& operator=(const WeakMapPtr& wmp) = delete;
+};
+
+} /* namespace JS */
+
+#endif /* js_WeakMapPtr_h */