How to use the auth0-js.version function in auth0-js

var crypto = require('./crypto');
var session = require('./session');
var getOS = require('./utils').getOS;
var version = require('./version').raw;

var generateProofKey = crypto.generateProofKey;
var generateState = crypto.generateState;
var closingDelayMs = 1000;

session.clean();

var telemetry = {
  name: 'auth0-cordova',
  version: version,
  env: {
    'auth0.js': auth0.version,
    os: getOS()
  }
};

/**
 * Creates a new Cordova client to handle AuthN/AuthZ with OAuth and OS browser.
 * @constructor
 * @param {Object} options
 * @param {String} options.domain your Auth0 domain
 * @param {String} options.clientId your Auth0 client identifier obtained when creating the client in the Auth0 Dashboard
 * @see {@link https://auth0.com/docs/api/authentication}
 */
function CordovaAuth(options) {
  this.clientId = options.clientId;
  this.domain = options.domain;
  this.redirectUri = options.packageIdentifier + '://' + options.domain + '/cordova/' + options.packageIdentifier + '/callback';