How to use the node-opcua-common.ServerState.NoConfiguration function in node-opcua-common

//      and sessionDiagnostics.currentSubscriptionsCount ( with an s)
    assert(this.serverDiagnosticsSummary.hasOwnProperty("currentSubscriptionCount"));

    (this.serverDiagnosticsSummary as any).__defineGetter__("currentSubscriptionCount", () => {
      // currentSubscriptionCount returns the total number of subscriptions
      // that are currently active on all sessions
      let counter = 0;
      _.values(this._sessions).forEach((session: ServerSession) => {
        counter += session.currentSubscriptionCount;
      });
      return counter;
    });

    this.status = "creating";

    this.setServerState(ServerState.NoConfiguration);

    this.addressSpace = null;

    this._shutdownTask = [];

    this._applicationUri = "";
    if (typeof options.applicationUri === "function") {
      (this as any).__defineGetter__("_applicationUri", options.applicationUri);
    } else {
      this._applicationUri = options.applicationUri || "";
    }

    options.serverDiagnosticsEnabled = options.hasOwnProperty("serverDiagnosticsEnable")
      ? options.serverDiagnosticsEnabled : true;

    this.serverDiagnosticsEnabled = options.serverDiagnosticsEnabled!;

EventEmitter.apply(this, arguments);
    const engine = this;
    ServerEngine.registry.register(engine);

    engine._sessions = {};
    engine._closedSessions = {};
    engine._orphanPublishEngine = null; // will be constructed on demand

    engine.isAuditing = _.isBoolean(options.isAuditing) ? options.isAuditing : false;

    options.buildInfo.buildDate = options.buildInfo.buildDate || new Date();
    // ---------------------------------------------------- ServerStatus
    engine.serverStatus = new ServerStatus({
        startTime: new Date(),
        currentTime: new Date(),
        state: ServerState.NoConfiguration,
        buildInfo: options.buildInfo,
        secondsTillShutdown: 0,
        shutdownReason: {text: ""}
    });


    // --------------------------------------------------- ServerCapabilities
    options.serverCapabilities = options.serverCapabilities || {};
    options.serverCapabilities.serverProfileArray = options.serverCapabilities.serverProfileArray || [
        "Standard UA Server Profile",
        "Embedded UA Server Profile",
        "Micro Embedded Device Server Profile",
        "Nano Embedded Device Server Profile"
    ];
    options.serverCapabilities.localeIdArray = options.serverCapabilities.localeIdArray || ["en-EN", "fr-FR"];

//      and sessionDiagnostics.currentSubscriptionsCount ( with an s)
    assert(engine.serverDiagnosticsSummary.hasOwnProperty("currentSubscriptionCount"));

    engine.serverDiagnosticsSummary.__defineGetter__("currentSubscriptionCount", function () {
        // currentSubscriptionCount returns the total number of subscriptions
        // that are currently active on all sessions
        let counter = 0;
        _.values(engine._sessions).forEach(function (session) {
            counter += session.currentSubscriptionCount;
        });
        return counter;
    });

    engine.status = "creating";

    engine.setServerState(ServerState.NoConfiguration);

    engine.addressSpace = null;

    engine._shutdownTask = [];

    engine._applicationUri = options.applicationUri || "";

    options.serverDiagnosticsEnabled = options.hasOwnProperty("serverDiagnosticsEnable")
                                            ? options.serverDiagnosticsEnabled : true;
    engine.serverDiagnosticsEnabled = options.serverDiagnosticsEnabled;

}

this._sessions = {};
    this._closedSessions = {};
    this._orphanPublishEngine = undefined; // will be constructed on demand

    this.isAuditing = _.isBoolean(options.isAuditing) ? options.isAuditing : false;

    options.buildInfo.buildDate = options.buildInfo.buildDate || new Date();
    // ---------------------------------------------------- ServerStatusDataType
    this.serverStatus = new ServerStatusDataType({
      buildInfo: options.buildInfo,
      currentTime: new Date(),
      secondsTillShutdown: 0,
      shutdownReason: { text: "" },
      startTime: new Date(),
      state: ServerState.NoConfiguration
    });

    // --------------------------------------------------- ServerCapabilities
    options.serverCapabilities = options.serverCapabilities || {};
    options.serverCapabilities.serverProfileArray = options.serverCapabilities.serverProfileArray || [
      "Standard UA Server Profile",
      "Embedded UA Server Profile",
      "Micro Embedded Device Server Profile",
      "Nano Embedded Device Server Profile"
    ];
    options.serverCapabilities.localeIdArray = options.serverCapabilities.localeIdArray || ["en-EN", "fr-FR"];

    this.serverCapabilities = new ServerCapabilities(options.serverCapabilities);

    // to do when spec is clear about what goes here!
    // spec 1.04 says (in Part 4 7.33 SignedSoftwareCertificate