diff -r 000000000000 -r 6474c204b198 js/public/TypeDecls.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/public/TypeDecls.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,73 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * vim: set ts=8 sts=4 et sw=4 tw=99:
+ * 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/. */
+
+// This file contains public type declarations that are used *frequently*.  If
+// it doesn't occur at least 10 times in Gecko, it probably shouldn't be in
+// here.
+//
+// It includes only:
+// - forward declarations of structs and classes;
+// - typedefs;
+// - enums (maybe).
+// It does *not* contain any struct or class definitions.
+
+#ifndef js_TypeDecls_h
+#define js_TypeDecls_h
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include "js-config.h"
+
+struct JSContext;
+class JSFunction;
+class JSObject;
+class JSScript;
+class JSString;
+
+struct jsid;
+
+typedef char16_t jschar;
+
+namespace JS {
+
+class Value;
+template <typename T> class Handle;
+template <typename T> class MutableHandle;
+template <typename T> class Rooted;
+template <typename T> class PersistentRooted;
+
+typedef Handle<JSFunction*> HandleFunction;
+typedef Handle<jsid>        HandleId;
+typedef Handle<JSObject*>   HandleObject;
+typedef Handle<JSScript*>   HandleScript;
+typedef Handle<JSString*>   HandleString;
+typedef Handle<Value>       HandleValue;
+
+typedef MutableHandle<JSFunction*> MutableHandleFunction;
+typedef MutableHandle<jsid>        MutableHandleId;
+typedef MutableHandle<JSObject*>   MutableHandleObject;
+typedef MutableHandle<JSScript*>   MutableHandleScript;
+typedef MutableHandle<JSString*>   MutableHandleString;
+typedef MutableHandle<Value>       MutableHandleValue;
+
+typedef Rooted<JSObject*>       RootedObject;
+typedef Rooted<JSFunction*>     RootedFunction;
+typedef Rooted<JSScript*>       RootedScript;
+typedef Rooted<JSString*>       RootedString;
+typedef Rooted<jsid>            RootedId;
+typedef Rooted<JS::Value>       RootedValue;
+
+typedef PersistentRooted<JSFunction*> PersistentRootedFunction;
+typedef PersistentRooted<jsid>        PersistentRootedId;
+typedef PersistentRooted<JSObject*>   PersistentRootedObject;
+typedef PersistentRooted<JSScript*>   PersistentRootedScript;
+typedef PersistentRooted<JSString*>   PersistentRootedString;
+typedef PersistentRooted<Value>       PersistentRootedValue;
+
+} // namespace JS
+
+#endif /* js_TypeDecls_h */