LibWeb: Add ReadableStreamBYOBRequest interface

Userland/Libraries/LibWeb/Streams/ReadableStreamBYOBRequest.h

@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2023, Matthew Olsson <mattco@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <LibJS/Runtime/TypedArray.h>
+#include <LibWeb/Bindings/PlatformObject.h>
+
+namespace Web::Streams {
+
+// https://streams.spec.whatwg.org/#readablestreambyobrequest
+class ReadableStreamBYOBRequest : public Bindings::PlatformObject {
+    WEB_PLATFORM_OBJECT(ReadableStreamBYOBRequest, Bindings::PlatformObject);
+
+public:
+    virtual ~ReadableStreamBYOBRequest() override = default;
+
+    JS::GCPtr<JS::TypedArrayBase> view();
+
+private:
+    explicit ReadableStreamBYOBRequest(JS::Realm&);
+
+    virtual void visit_edges(Cell::Visitor&) override;
+
+    // https://streams.spec.whatwg.org/#readablestreambyobrequest-controller
+    // The parent ReadableByteStreamController instance
+    JS::GCPtr<JS::Object> m_controller;
+
+    // https://streams.spec.whatwg.org/#readablestreambyobrequest-view
+    // A typed array representing the destination region to which the controller can write generated data, or null after the BYOB request has been invalidated.
+    JS::GCPtr<JS::TypedArrayBase> m_view;
+};
+
+}