invokeAsync0<T>  function 
 
Invokes a zero-argument Node.js-style asynchronous function and encapsulates
the result in a Future.
Implementation
Future<T> invokeAsync0<T>(void Function(void Function(Object?, T)) function) {
  var completer = Completer<T>();
  function(callbackToCompleter(completer));
  return completer.future;
}