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diff --git a/tools/qmlls/qlanguageserver.h b/tools/qmlls/qlanguageserver.h
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+/****************************************************************************
+**
+** Copyright (C) 2021 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the tools applications 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 QLANGUAGESERVER_P_H
+#define QLANGUAGESERVER_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 <QtLanguageServer/private/qlanguageserverspec_p.h>
+#include <QtLanguageServer/private/qlanguageserverprotocol_p.h>
+#include <QtLanguageServer/private/qlspnotifysignals_p.h>
+#include <QtCore/qloggingcategory.h>
+
+QT_BEGIN_NAMESPACE
+
+class QLanguageServer;
+class QLanguageServerPrivate;
+Q_DECLARE_LOGGING_CATEGORY(lspServerLog)
+
+class QLanguageServerModule : public QObject
+{
+    Q_OBJECT
+public:
+    QLanguageServerModule(QObject *parent = nullptr) : QObject(parent) { }
+    virtual QString name() const = 0;
+    virtual void registerHandlers(QLanguageServer *server, QLanguageServerProtocol *protocol) = 0;
+    virtual void setupCapabilities(const QLspSpecification::InitializeParams &clientInfo,
+                                   QLspSpecification::InitializeResult &) = 0;
+};
+
+class QLanguageServer : public QObject
+{
+    Q_OBJECT
+    Q_PROPERTY(RunStatus runStatus READ runStatus NOTIFY runStatusChanged)
+    Q_PROPERTY(bool isInitialized READ isInitialized)
+public:
+    QLanguageServer(const QJsonRpcTransport::DataHandler &h, QObject *parent = nullptr);
+    ~QLanguageServer();
+    enum class RunStatus {
+        NotSetup,
+        SettingUp,
+        DidSetup,
+        Initializing,
+        DidInitialize, // normal state of execution
+        WaitPending,
+        Stopping,
+        Stopped
+    };
+
+    QLanguageServerProtocol *protocol();
+    void finishSetup();
+    void registerHandlers(QLanguageServerProtocol *protocol);
+    void setupCapabilities(const QLspSpecification::InitializeParams &clientInfo,
+                           QLspSpecification::InitializeResult &serverInfo);
+    void addServerModule(QLanguageServerModule *serverModule);
+    QLanguageServerModule *moduleByName(const QString &n) const;
+    QLspNotifySignals *notifySignals();
+
+    // API
+    RunStatus runStatus() const;
+    bool isInitialized() const;
+    bool isRequestCanceled(const QJsonRpc::IdType &id) const;
+    const QLspSpecification::InitializeParams &clientInfo() const;
+    const QLspSpecification::InitializeResult &serverInfo() const;
+
+public slots:
+    void receiveData(const QByteArray &d);
+signals:
+    void runStatusChanged(RunStatus);
+    void clientInitialized(QLanguageServer *server);
+    void shutdown();
+    void exit();
+    void lifecycleError();
+
+private:
+    void registerMethods(QJsonRpc::TypedRpc &typedRpc);
+    void executeShutdown();
+    Q_DISABLE_COPY(QLanguageServer)
+    Q_DECLARE_PRIVATE(QLanguageServer)
+};
+
+QT_END_NAMESPACE
+
+#endif // QLANGUAGESERVER_P_H