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diff --git a/js/src/builtin/streams/QueueWithSizes.h b/js/src/builtin/streams/QueueWithSizes.h
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+++ b/js/src/builtin/streams/QueueWithSizes.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/. */
+
+/* Queue-with-sizes operations. */
+
+#ifndef builtin_streams_QueueWithSizes_h
+#define builtin_streams_QueueWithSizes_h
+
+#include "mozilla/Assertions.h"  // MOZ_ASSERT
+#include "mozilla/Attributes.h"  // MOZ_MUST_USE
+
+#include "jstypes.h"        // JS_PUBLIC_API
+#include "js/RootingAPI.h"  // JS::{,Mutable}Handle
+#include "js/Value.h"       // JS::Value
+#include "vm/List.h"        // js::ListObject
+
+struct JS_PUBLIC_API JSContext;
+
+namespace js {
+
+class StreamController;
+
+/**
+ * Streams spec, 6.2.1. DequeueValue ( container ) nothrow
+ */
+extern MOZ_MUST_USE bool DequeueValue(
+    JSContext* cx, JS::Handle<StreamController*> unwrappedContainer,
+    JS::MutableHandle<JS::Value> chunk);
+
+/**
+ * Streams spec, 6.2.1. DequeueValue ( container ) nothrow
+ * when the dequeued value is ignored.
+ */
+extern void DequeueValue(StreamController* unwrappedContainer, JSContext* cx);
+
+/**
+ * Streams spec, 6.2.2. EnqueueValueWithSize ( container, value, size ) throws
+ */
+extern MOZ_MUST_USE bool EnqueueValueWithSize(
+    JSContext* cx, JS::Handle<StreamController*> unwrappedContainer,
+    JS::Handle<JS::Value> value, JS::Handle<JS::Value> sizeVal);
+
+/**
+ * Streams spec, 6.2.4. ResetQueue ( container ) nothrow
+ */
+extern MOZ_MUST_USE bool ResetQueue(
+    JSContext* cx, JS::Handle<StreamController*> unwrappedContainer);
+
+inline bool QueueIsEmpty(ListObject* unwrappedQueue) {
+  if (unwrappedQueue->isEmpty()) {
+    return true;
+  }
+
+  MOZ_ASSERT((unwrappedQueue->length() % 2) == 0,
+             "queue-with-sizes must consist of (value, size) element pairs and "
+             "so must have even length");
+  return false;
+}
+
+}  // namespace js
+
+#endif  // builtin_streams_QueueWithSizes_h