How to access non standard objects in Elemental2?

Hello, I'm currently working on PWA functionality in our GWT app, trying to utilise Elemental2 / JSInterop where possible instead of writing javascript. To detect if the app is launched in PWA mode on IOS, this is the recommended javascript:

const isInStandaloneMode = () => ('standalone' in window.navigator) && (window.navigator.standalone);  

However there appears to be no DomGlobal.window.navigator.standalone object in Elemental2, as I'm guessing it has not been standardised. 

So my question is, is there a recommended way to define this object so that I can replicate the above javascript without resorting to JSNI? Or is there another way to achieve this?

Thanks

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