loadAsync method
Implementation
loadAsync(url) async {
var scope = this;
var loader = new FileLoader(this.manager);
loader.setPath(this.path);
loader.setResponseType('arraybuffer');
loader.setRequestHeader(this.requestHeader);
loader.setWithCredentials(this.withCredentials);
var buffer = await loader.loadAsync(url);
return this._parse(buffer);
}