How to use the howler.Howler function in howler

/**
 * howler-tests.ts
 * Created by xperiments on 02/09/14.
 */
///

import * as howler from "howler";

howler.Howler = Howler;
howler.Howl = Howl;

Howler.codecs('ogg');
Howler.iOSAutoEnable = true;
var sound = new Howl({
    urls: ['sound.mp3']
}).play();


var sound = new Howl({
    urls: ['sound.mp3', 'sound.ogg', 'sound.wav'],
    autoplay: true,
    loop: true,
    volume: 0.5,
    onend: function() {
        console.log('Finished!');

'use strict';

var EventEmitter = require('events').EventEmitter,
	Actor = require('CharRedactor'),
	Howl = require('howler').Howl,
	Howler = require('howler').Howler,
	GameObject = require('./gameobject'),
	Net = require('./net'),
	//Suika = require('./suika'),
	Bat = require('./bat'),
	Item = require('./item'),
	Tiled = require('tiled.js');

function Game(renderer, stage) {
	this.container = new PIXI.DisplayObjectContainer();
	stage.addChild(this.container);

	var loader = new PIXI.AssetLoader(['/suika.json']);
	loader.load();
	this.suika_anim = require('../public/animations.json');
	console.log(this.suika_anim);

},{}],"/home/lain/gocode/src/oniproject/js/game.js":[function(require,module,exports){
'use strict';

var EventEmitter = require('events').EventEmitter,
	Actor = require('CharRedactor'),
	Howl = require('howler').Howl,
	Howler = require('howler').Howler,
	GameObject = require('./gameobject'),
	Net = require('./net'),
	//Suika = require('./suika'),
	Bat = require('./bat'),
	Item = require('./item'),
	Tiled = require('tiled.js');

function Game(renderer, stage) {
	this.container = new PIXI.DisplayObjectContainer();
	stage.addChild(this.container);

	var loader = new PIXI.AssetLoader(['/suika.json']);
	loader.load();
	this.suika_anim = require('../public/animations.json');
	console.log(this.suika_anim);