How to handle newInstance()?

[GeorgeS2019]

//The bundle exposes a single jsSingleUI member on the window:

var jsUI= jsSingleUI.newInstance({
    container:someDOMElement
})

Is this a constructor or a case of CallRef?

[sps014]

Isn't it simply a function call?

var param=new Window.Construct("Object"); //var param=new Object();
param.SetPropVal("container",HtmlElementReference); //container:someDOMElement
Window.PropRef("jsSingleUI").CallRef("newInstance",param);