Conditional Transitions with asynchronous function

[keids]

Is it possible?
I tried in a different ways but I always get an error.

I need to do something like this:
states: A, B and C.
transition: step.
From state A, 'step' transition must be a function which returns B or C depending on asynchronous operation.

var fsm = new StateMachine({
    init: 'A',
    transitions: [
      { name: 'step', 
        from: 'A', 
        to: async function() { 
              var state = await getState()      
              return state
         }
     }
    ]
  });

Thanks in advance.

[Timo Ulich]

I could try to file a PR for this. Any concerns @jakesgordon ?