Everywhere: Hoist the Libraries folder to the top-level

Author: https://github.com/trflynn89
Commit: 93712b24bf
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/2256
Reviewed-by: https://github.com/sideshowbarker

Libraries/LibWeb/WebDriver/Response.h

@@ -0,0 +1,55 @@
+/*
+ * Copyright (c) 2022, Tim Flynn <trflynn89@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/JsonValue.h>
+#include <AK/Variant.h>
+#include <LibIPC/Forward.h>
+#include <LibWeb/WebDriver/Error.h>
+
+namespace Web::WebDriver {
+
+// FIXME: Ideally, this could be `using Response = ErrorOr<JsonValue, Error>`, but that won't be
+//        default-constructible, which is a requirement for the generated IPC.
+struct [[nodiscard]] Response {
+    Response() = default;
+    Response(JsonValue&&);
+    Response(Error&&);
+
+    JsonValue& value() { return m_value_or_error.template get<JsonValue>(); }
+    JsonValue const& value() const { return m_value_or_error.template get<JsonValue>(); }
+
+    Error& error() { return m_value_or_error.template get<Error>(); }
+    Error const& error() const { return m_value_or_error.template get<Error>(); }
+
+    bool is_error() const { return m_value_or_error.template has<Error>(); }
+
+    JsonValue release_value() { return move(value()); }
+    Error release_error() { return move(error()); }
+
+    template<typename... Visitors>
+    decltype(auto) visit(Visitors&&... visitors) const
+    {
+        return m_value_or_error.visit(forward<Visitors>(visitors)...);
+    }
+
+private:
+    // Note: Empty is only a possible state until the Response has been decoded by IPC.
+    Variant<Empty, JsonValue, Error> m_value_or_error;
+};
+
+}
+
+namespace IPC {
+
+template<>
+ErrorOr<void> encode(Encoder&, Web::WebDriver::Response const&);
+
+template<>
+ErrorOr<Web::WebDriver::Response> decode(Decoder&);
+
+}