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diff --git a/src/qml/qml/qqmlscriptdata_p.h b/src/qml/qml/qqmlscriptdata_p.h
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+/****************************************************************************
+**
+** Copyright (C) 2019 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtQml module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QQMLSCRIPTDATA_P_H
+#define QQMLSCRIPTDATA_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/qqmlrefcount_p.h>
+#include <private/qqmlcleanup_p.h>
+#include <private/qqmlscriptblob_p.h>
+#include <private/qv4value_p.h>
+#include <private/qv4persistent_p.h>
+#include <private/qv4executablecompilationunit_p.h>
+
+#include <QtCore/qurl.h>
+
+QT_BEGIN_NAMESPACE
+
+class QQmlTypeNameCache;
+class QQmlContextData;
+
+// QQmlScriptData instances are created, uninitialized, by the loader in the
+// load thread.  The first time they are used by the VME, they are initialized which
+// creates their v8 objects and they are referenced and added to the  engine's cleanup
+// list.  During QQmlCleanup::clear() all v8 resources are destroyed, and the
+// reference that was created is released but final deletion only occurs once all the
+// references as released.  This is all intended to ensure that the v8 resources are
+// only created and destroyed in the main thread :)
+class Q_AUTOTEST_EXPORT QQmlScriptData : public QQmlCleanup, public QQmlRefCount
+{
+private:
+    friend class QQmlTypeLoader;
+
+    QQmlScriptData();
+
+public:
+    QUrl url;
+    QString urlString;
+    QQmlRefPointer<QQmlTypeNameCache> typeNameCache;
+    QVector<QQmlRefPointer<QQmlScriptBlob>> scripts;
+
+    QV4::ReturnedValue scriptValueForContext(QQmlContextData *parentCtxt);
+
+    QQmlRefPointer<QV4::ExecutableCompilationUnit> compilationUnit() const { return m_precompiledScript; }
+
+protected:
+    void clear() override; // From QQmlCleanup
+
+private:
+    friend class QQmlScriptBlob;
+
+    void initialize(QQmlEngine *);
+    QQmlContextData *qmlContextDataForContext(QQmlContextData *parentQmlContextData);
+
+    bool m_loaded;
+    QQmlRefPointer<QV4::ExecutableCompilationUnit> m_precompiledScript;
+    QV4::PersistentValue m_value;
+};
+
+QT_END_NAMESPACE
+
+#endif // QQMLSCRIPTDATA_P_H