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diff --git a/dom/streams/TransformStreamDefaultController.h b/dom/streams/TransformStreamDefaultController.h
new file mode 100644
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+++ b/dom/streams/TransformStreamDefaultController.h
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* 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 DOM_STREAMS_TRANSFORMSTREAMDEFAULTCONTROLLER_H_
+#define DOM_STREAMS_TRANSFORMSTREAMDEFAULTCONTROLLER_H_
+
+#include "js/TypeDecls.h"
+#include "mozilla/AlreadyAddRefed.h"
+#include "mozilla/dom/BindingDeclarations.h"
+#include "mozilla/dom/QueuingStrategyBinding.h"
+
+#include "mozilla/dom/TransformerBinding.h"
+#include "nsCycleCollectionParticipant.h"
+#include "nsWrapperCache.h"
+
+namespace mozilla::dom {
+
+class TransformStream;
+class TransformerAlgorithmsBase;
+
+class TransformStreamDefaultController final : public nsISupports,
+                                               public nsWrapperCache {
+ public:
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_WRAPPERCACHE_CLASS(TransformStreamDefaultController)
+
+  MOZ_KNOWN_LIVE TransformStream* Stream();
+  void SetStream(TransformStream& aStream);
+  TransformerAlgorithmsBase* Algorithms();
+  void SetAlgorithms(TransformerAlgorithmsBase* aTransformerAlgorithms);
+
+  explicit TransformStreamDefaultController(nsIGlobalObject* aGlobal);
+
+ protected:
+  ~TransformStreamDefaultController();
+
+ public:
+  nsIGlobalObject* GetParentObject() const { return mGlobal; }
+  JSObject* WrapObject(JSContext* aCx,
+                       JS::Handle<JSObject*> aGivenProto) override;
+
+  Nullable<double> GetDesiredSize() const;
+
+  MOZ_CAN_RUN_SCRIPT void Enqueue(JSContext* aCx, JS::Handle<JS::Value> aChunk,
+                                  ErrorResult& aRv);
+  MOZ_CAN_RUN_SCRIPT void Error(JSContext* aCx, JS::Handle<JS::Value> aError,
+                                ErrorResult& aRv);
+  MOZ_CAN_RUN_SCRIPT void Terminate(JSContext* aCx, ErrorResult& aRv);
+
+ private:
+  nsCOMPtr<nsIGlobalObject> mGlobal;
+
+  // Internal slots
+  RefPtr<TransformStream> mStream;
+  RefPtr<TransformerAlgorithmsBase> mTransformerAlgorithms;
+};
+
+namespace streams_abstract {
+void SetUpTransformStreamDefaultController(
+    JSContext* aCx, TransformStream& aStream,
+    TransformStreamDefaultController& aController,
+    TransformerAlgorithmsBase& aTransformerAlgorithms);
+
+void SetUpTransformStreamDefaultControllerFromTransformer(
+    JSContext* aCx, TransformStream& aStream,
+    JS::Handle<JSObject*> aTransformer, Transformer& aTransformerDict);
+}  // namespace streams_abstract
+
+}  // namespace mozilla::dom
+
+#endif  // DOM_STREAMS_TRANSFORMSTREAMDEFAULTCONTROLLER_H_