Let's start from scratch with a new debugger for QmlJS.

src/plugins/qmljsinspector/qmljsdebuggerclient.h

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+/**************************************************************************
+**
+** This file is part of Qt Creator
+**
+** Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).
+**
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** Commercial Usage
+**
+** Licensees holding valid Qt Commercial licenses may use this file in
+** accordance with the Qt Commercial License Agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Nokia.
+**
+** GNU Lesser General Public License Usage
+**
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at http://qt.nokia.com/contact.
+**
+**************************************************************************/
+#ifndef QMLJSDEBUGGERCLIENT_H
+#define QMLJSDEBUGGERCLIENT_H
+
+#include <debugger/qml/qmlengine.h>
+#include <debugger/stackframe.h>
+#include <debugger/stackhandler.h>
+#include <debugger/debuggerrunner.h>
+#include <private/qdeclarativedebugclient_p.h> // QML private API
+
+namespace QmlJSInspector {
+namespace Internal {
+
+class DebuggerClient : public QDeclarativeDebugClient
+{
+    Q_OBJECT
+
+public:
+    DebuggerClient(QDeclarativeDebugConnection *client, Debugger::Internal::QmlEngine *engine);
+    virtual ~DebuggerClient();
+
+public: // attributes
+    QDeclarativeDebugConnection *connection;
+    Debugger::Internal::QmlEngine *engine;
+
+private Q_SLOTS:
+    void slotSendMessage(const QByteArray &message);
+
+protected:
+    virtual void messageReceived(const QByteArray &data);
+};
+
+} // Internal
+} // QmlJSInspector
+
+#endif // QMLJSDEBUGGERCLIENT_H