How to use the node-opcua-service-endpoints.ApplicationDescription function in node-opcua-service-endpoints

function adapt(server) {
            // Xx console.log(" xxxx",server);
            // Xx console.log(" xxx ", (new ApplicationDescription()).toString());
            return new ApplicationDescription({
                    applicationName: server.applicationName,
                    applicationUri:   server.applicationUri,
                    productUri:   server.productUri,
                    applicationType: server.applicationType,
                    gatewayServerUri: server.gatewayServerUri,
                    discoveryProfileUri: server.discoveryProfileUri,
                    discoveryUrls: server.discoveryUrls
            });
        }

public createSession(options: any): ServerSession {

    options = options || {};

    debugLog("createSession : increasing serverDiagnosticsSummary cumulatedSessionCount/currentSessionCount ");
    this.serverDiagnosticsSummary.cumulatedSessionCount += 1;
    this.serverDiagnosticsSummary.currentSessionCount += 1;

    this.clientDescription = options.clientDescription || new ApplicationDescription({});

    const sessionTimeout = options.sessionTimeout || 1000;

    assert(_.isNumber(sessionTimeout));

    const session = new ServerSession(this, sessionTimeout);

    const key = session.authenticationToken.toString();

    this._sessions[key] = session;

    // see spec OPC Unified Architecture,  Part 2 page 26 Release 1.02
    // TODO : When a Session is created, the Server adds an entry for the Client
    //        in its SessionDiagnosticsArray Variable

    const engine = this;

function adapt(applicationDescription: ApplicationDescription): ApplicationDescription {
                return new ApplicationDescription({
                    applicationName: applicationDescription.applicationName,
                    applicationType: applicationDescription.applicationType,
                    applicationUri: applicationDescription.applicationUri,
                    discoveryProfileUri: applicationDescription.discoveryProfileUri,
                    discoveryUrls: applicationDescription.discoveryUrls,
                    gatewayServerUri: applicationDescription.gatewayServerUri,
                    productUri: applicationDescription.productUri
                });
            }

options.certificateFile = options.certificateFile || constructFilename("certificates/server_selfsigned_cert_2048.pem");
        options.privateKeyFile = options.privateKeyFile || constructFilename("certificates/PKI/own/private/private_key.pem");

        super(options);

        const self = this;
        self.endpoints = [];
        self.options = options;

        this.serverInfo = _.clone(default_server_info);
        this.serverInfo = _.extend(this.serverInfo, options.serverInfo);

        self.serverInfo.applicationName = new LocalizedText(self.serverInfo.applicationName);

        this.serverInfo = new endpoints_service.ApplicationDescription(this.serverInfo);

        self.serverCertificateManager = options.serverCertificateManager || new CertificateManager({
            name: "certificates"
        });

    }

public dispose() {

        this._certificateChain = emptyCertificate;
        this._privateKey = emptyPrivateKeyPEM;

        assert(Object.keys(this._channels).length === 0, "OPCUAServerEndPoint channels must have been deleted");
        this._channels = {};
        this.serverInfo = new ApplicationDescription({});

        this._endpoints = [];
        assert(this._endpoints.length === 0, "endpoints must have been deleted");
        this._endpoints = [];

        this._server = undefined;
        this._listen_callback = null;

        this.removeAllListeners();

    }

options = options || {} as OPCUABaseServerOptions;
        options.certificateFile = options.certificateFile ||
          constructFilename("certificates/server_selfsigned_cert_2048.pem");

        options.privateKeyFile = options.privateKeyFile ||
          constructFilename("certificates/PKI/own/private/private_key.pem");

        super(options);

        this.capabilitiesForMDNS = [];
        this.endpoints = [];
        this.options = options;

        const serverInfo: any = _.extend(_.clone(default_server_info), options.serverInfo);
        serverInfo.applicationName = new LocalizedText(serverInfo.applicationName);
        this.serverInfo = new ApplicationDescription(serverInfo);

        this.serverCertificateManager = options.serverCertificateManager
          || new OPCUACertificateManager({
            name: "certificates"
        });

    }

public dispose() {

        this._certificateChain = emptyCertificate;
        this._privateKey = emptyPrivateKeyPEM;

        assert(Object.keys(this._channels).length === 0, "OPCUAServerEndPoint channels must have been deleted");
        this._channels = {};
        this.serverInfo = new ApplicationDescription({});

        this._endpoints = [];
        assert(this._endpoints.length === 0, "endpoints must have been deleted");
        this._endpoints = [];

        this._server = undefined;
        this._listen_callback = null;

        this.removeAllListeners();

    }