How to use the node-opcua-service-session.CloseSessionRequest function in node-opcua-service-session

const util = require("util");
const _ = require("underscore");
const assert = require("node-opcua-assert").assert;
const crypto = require("crypto");
const async = require("async");
const chalk = require("chalk");

const StatusCodes = require("node-opcua-status-code").StatusCodes;

const session_service = require("node-opcua-service-session");
const AnonymousIdentityToken = session_service.AnonymousIdentityToken;
const CreateSessionRequest = session_service.CreateSessionRequest;
const CreateSessionResponse = session_service.CreateSessionResponse;
const ActivateSessionRequest = session_service.ActivateSessionRequest;
const ActivateSessionResponse = session_service.ActivateSessionResponse;
const CloseSessionRequest = session_service.CloseSessionRequest;

const endpoints_service = require("node-opcua-service-endpoints");
const ApplicationDescription = endpoints_service.ApplicationDescription;
const ApplicationType = endpoints_service.ApplicationType;
const EndpointDescription = endpoints_service.EndpointDescription;
const MessageSecurityMode = require("node-opcua-service-secure-channel").MessageSecurityMode;

const SecurityPolicy = require("node-opcua-secure-channel").SecurityPolicy;
const getCryptoFactory = require("node-opcua-secure-channel").getCryptoFactory;
const fromURI = require("node-opcua-secure-channel").fromURI;

const crypto_utils = require("node-opcua-crypto");
const UserNameIdentityToken = session_service.UserNameIdentityToken;


const buffer_utils = require("node-opcua-buffer-utils");

const endpoints_service = require("node-opcua-service-endpoints");
const query_service = require("node-opcua-service-query");

const ServerState = require("node-opcua-common").ServerState;
const EndpointDescription = endpoints_service.EndpointDescription;

const TimestampsToReturn = read_service.TimestampsToReturn;

const ActivateSessionRequest = session_service.ActivateSessionRequest;
const ActivateSessionResponse = session_service.ActivateSessionResponse;

const CreateSessionRequest = session_service.CreateSessionRequest;
const CreateSessionResponse = session_service.CreateSessionResponse;


const CloseSessionRequest = session_service.CloseSessionRequest;
const CloseSessionResponse = session_service.CloseSessionResponse;

const DeleteMonitoredItemsRequest = subscription_service.DeleteMonitoredItemsRequest;
const DeleteMonitoredItemsResponse = subscription_service.DeleteMonitoredItemsResponse;

const RepublishRequest = subscription_service.RepublishRequest;
const RepublishResponse = subscription_service.RepublishResponse;

const PublishRequest = subscription_service.PublishRequest;
const PublishResponse = subscription_service.PublishResponse;

const CreateSubscriptionRequest = subscription_service.CreateSubscriptionRequest;
const CreateSubscriptionResponse = subscription_service.CreateSubscriptionResponse;

const DeleteSubscriptionsRequest = subscription_service.DeleteSubscriptionsRequest;
const DeleteSubscriptionsResponse = subscription_service.DeleteSubscriptionsResponse;