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diff --git a/src/qml/qmltc/supportlibrary/qqmlcpponassignment_p.h b/src/qml/qmltc/supportlibrary/qqmlcpponassignment_p.h
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index 0000000000..cd8014895f
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+++ b/src/qml/qmltc/supportlibrary/qqmlcpponassignment_p.h
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+// Copyright (C) 2021 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+
+#ifndef QQMLCPPONASSIGNMENT_P_H
+#define QQMLCPPONASSIGNMENT_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <private/qqmlpropertyvalueinterceptor_p.h>
+#include <QtQml/qqmlpropertyvaluesource.h>
+
+QT_BEGIN_NAMESPACE
+
+/*! \internal
+
+    Helper class that provides setTarget() functionality for both value
+    interceptors and value sources.
+
+    Property value sources could be problematic because QQuickAbstractAnimation
+    changes access specifier of QQmlPropertyValueSource::setTarget() to private
+    (unintentionally?). This API allows to avoid manual casts to base types as
+    the C++ compiler would implicitly cast derived classes in this case.
+*/
+struct Q_QML_EXPORT QQmlCppOnAssignmentHelper
+{
+    // TODO: in theory, this API might just accept QObject * and int that would
+    // give the QMetaProperty. using the meta property, one could create
+    // QQmlProperty with a call to QQmlProperty::restore() (if there's an
+    // overload that takes QMetaProperty instead of QQmlPropertyData - which is
+    // also possible to add by using QQmlPropertyData::load())
+    static void set(QQmlPropertyValueInterceptor *interceptor, const QQmlProperty &property);
+    static void set(QQmlPropertyValueSource *valueSource, const QQmlProperty &property);
+};
+
+QT_END_NAMESPACE
+
+#endif // QQMLCPPONASSIGNMENT_P_H