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diff --git a/src/lib/corelib/loader/projecttreebuilder.h b/src/lib/corelib/loader/projecttreebuilder.h
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+/****************************************************************************
+**
+** Copyright (C) 2023 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qbs.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#pragma once
+
+#include "moduleproviderloader.h"
+
+#include <language/forward_decls.h>
+#include <language/moduleproviderinfo.h>
+#include <language/qualifiedid.h>
+
+#include <QString>
+#include <QVariant>
+
+namespace qbs {
+class SetupProjectParameters;
+namespace Internal {
+class Evaluator;
+class FileTime;
+class Item;
+class ItemPool;
+class ProgressObserver;
+
+using ModulePropertiesPerGroup = std::unordered_map<const Item *, QualifiedIdSet>;
+
+// TODO: This class only needs to be known inside the ProjectResolver; no need to
+//       instantiate them separately when they always appear together.
+//       Possibly we can get rid of the Loader class altogether.
+class ProjectTreeBuilder
+{
+public:
+    ProjectTreeBuilder(const SetupProjectParameters &parameters, ItemPool &itemPool,
+                       Evaluator &evaluator, Logger &logger);
+    ~ProjectTreeBuilder();
+
+    struct Result
+    {
+        struct ProductInfo
+        {
+            std::vector<ProbeConstPtr> probes;
+            ModulePropertiesPerGroup modulePropertiesSetInGroups;
+            ErrorInfo delayedError;
+        };
+
+        Item *root = nullptr;
+        std::unordered_map<Item *, ProductInfo> productInfos;
+        std::vector<ProbeConstPtr> projectProbes;
+        StoredModuleProviderInfo storedModuleProviderInfo;
+        Set<QString> qbsFiles;
+        QVariantMap profileConfigs;
+    };
+    Result load();
+
+    void setProgressObserver(ProgressObserver *progressObserver);
+    void setSearchPaths(const QStringList &searchPaths);
+    void setOldProjectProbes(const std::vector<ProbeConstPtr> &oldProbes);
+    void setOldProductProbes(const QHash<QString, std::vector<ProbeConstPtr>> &oldProbes);
+    void setLastResolveTime(const FileTime &time);
+    void setStoredProfiles(const QVariantMap &profiles);
+    void setStoredModuleProviderInfo(const StoredModuleProviderInfo &moduleProviderInfo);
+
+private:
+    class Private;
+    Private * const d;
+};
+
+} // namespace Internal
+} // namespace qbs