How to use the webrtc-adapter.default function in webrtc-adapter

'use strict';

var browserDetails = require('webrtc-adapter').default.browserDetails;
var uuid_v1 = require('uuid/v1');
var util = require('./util');
var connections = {};
var LOCAL_CACHED_VIDEO = "-LOCAL_CACHED_VIDEO";
var REMOTE_CACHED_VIDEO = "-REMOTE_CACHED_VIDEO";
var extensionId;
var defaultConstraints;
var logger;
var LOG_PREFIX = "webrtc";
var audioContext;
var createMicGainNode;
var microphoneGain;
var constants = require('./constants');
var validBrowsers = ["firefox", "chrome", "safari"];

var createConnection = function (options) {

'use strict';

var uuid_v1 = require('uuid/v1');
var constants = require("./constants");
var util = require('./util');
var logger = require('./util').logger;
var loggerConf = {push: false, severity: "INFO"};
var Promise = require('promise-polyfill');
var KalmanFilter = require('kalmanjs');
var browserDetails = require('webrtc-adapter').default.browserDetails;
var LOG_PREFIX = "core";
var isUsingTemasysPlugin = false;

/**
 * @namespace Flashphoner
 */

var SESSION_STATUS = constants.SESSION_STATUS;
var STREAM_STATUS = constants.STREAM_STATUS;
var CALL_STATUS = constants.CALL_STATUS;
var TRANSPORT_TYPE = constants.TRANSPORT_TYPE;
var CONNECTION_QUALITY = constants.CONNECTION_QUALITY;
var VIDEO_RATE_GOOD_QUALITY_PERCENT_DIFFERENCE = 20;
var VIDEO_RATE_BAD_QUALITY_PERCENT_DIFFERENCE = 50;
var LOW_VIDEO_RATE_THRESHOLD_BAD_PERFECT = 50000;
var LOW_VIDEO_RATE_BAD_QUALITY_PERCENT_DIFFERENCE = 150;