How to use the node-opcua-secure-channel.toURI function in node-opcua-secure-channel

function _makeEndpointDescription(options: MakeEndpointDescriptionOptions): EndpointDescriptionEx {

    assert(_.isFinite(options.port), "expecting a valid port number");
    assert(options.hasOwnProperty("serverCertificateChain"));
    assert(!options.hasOwnProperty("serverCertificate"));
    assert(!!options.securityMode); // s.MessageSecurityMode
    assert(!!options.securityPolicy);
    assert(_.isObject(options.server));
    assert(!!options.hostname && (typeof options.hostname === "string"));
    assert(_.isBoolean(options.restricted));

    options.securityLevel = (options.securityLevel === undefined) ? 3 : options.securityLevel;
    assert(_.isFinite(options.securityLevel), "expecting a valid securityLevel");

    const securityPolicyUri = toURI(options.securityPolicy);

    const userIdentityTokens = [];

    if (options.securityPolicy === SecurityPolicy.None) {

        if (options.allowUnsecurePassword) {
            userIdentityTokens.push({
                policyId: "username_unsecure",
                tokenType: UserTokenType.UserName,

                issuedTokenType: null,
                issuerEndpointUrl: null,
                securityPolicyUri: null
            });
        }

function _makeEndpointDescription(options: MakeEndpointDescriptionOptions): EndpointDescriptionEx {

    assert(_.isFinite(options.port), "expecting a valid port number");
    assert(options.hasOwnProperty("serverCertificateChain"));
    assert(!options.hasOwnProperty("serverCertificate"));
    assert(!!options.securityMode); // s.MessageSecurityMode
    assert(!!options.securityPolicy);
    assert(_.isObject(options.server));
    assert(!!options.hostname && (typeof options.hostname === "string"));
    assert(_.isBoolean(options.restricted));

    options.securityLevel = (options.securityLevel === undefined) ? 3 : options.securityLevel;
    assert(_.isFinite(options.securityLevel), "expecting a valid securityLevel");

    const securityPolicyUri = toURI(options.securityPolicy);

    const userIdentityTokens = [];

    if (options.securityPolicy === SecurityPolicy.None) {

        if (options.allowUnsecurePassword) {
            userIdentityTokens.push({
                policyId: "username_unsecure",
                tokenType: UserTokenType.UserName,

                issuedTokenType: null,
                issuerEndpointUrl: null,
                securityPolicyUri: null
            });
        }

this.defaultSecureTokenLifetime = options.defaultSecureTokenLifetime || 600000;
    this.tokenRenewalInterval = options.tokenRenewalInterval || 0;
    assert(_.isFinite(this.tokenRenewalInterval) && this.tokenRenewalInterval >= 0);
    /**
     * @property securityMode
     * @type MessageSecurityMode
     */
    this.securityMode = options.securityMode || MessageSecurityMode.NONE;
    this.securityMode = MessageSecurityMode.get(this.securityMode);

    /**
     * @property securityPolicy
     * @type {SecurityPolicy}
     */
    this.securityPolicy = options.securityPolicy || toURI("None");
    this.securityPolicy = SecurityPolicy.get(this.securityPolicy);

    /**
     * @property serverCertificate
     * @type {Certificate}
     */
    this.serverCertificate = options.serverCertificate || null;

    /**
     * true if session shall periodically probe the server to keep the session alive and prevent timeout
     * @property keepSessionAlive
     * @type {boolean}
     */
    this.keepSessionAlive = _.isBoolean(options.keepSessionAlive) ? options.keepSessionAlive : false;

    // statistics...