synchronously waiting for a Promise

Hi guys,

I'm trying to wrap a JS function which returns a Promise with a synchronous function in Java. Something like CompletableFuture.get(). I understand that CompletableFuture isn't emulated yet. 

Is there any other way to achieve this? The alternative of propagating callbacks/promises all the way up my Java stack is not really an option. 

Many thanks for any suggestions,

Ian

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