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diff --git a/js/src/builtin/streams/StreamController-inl.h b/js/src/builtin/streams/StreamController-inl.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/. */
+
+/* Base stream controller inlines. */
+
+#ifndef builtin_streams_StreamController_inl_h
+#define builtin_streams_StreamController_inl_h
+
+#include "builtin/streams/StreamController.h" // js::StreamController
+#include "builtin/streams/ReadableStreamController.h" // js::Readable{ByteStream,StreamDefault}Controller
+#include "builtin/streams/WritableStreamDefaultController.h" // js::WritableStreamDefaultController
+#include "vm/JSObject.h" // JSObject
+
+template <>
+inline bool JSObject::is<js::StreamController>() const {
+ return is<js::ReadableStreamDefaultController>() ||
+ is<js::ReadableByteStreamController>() ||
+ is<js::WritableStreamDefaultController>();
+}
+
+#endif // builtin_streams_ReadableStreamController_inl_h