function enhancePromiseForAureliaBinding(promise) {
  if (!promise || typeof promise.then != 'function') return;
  if (promise.hasOwnProperty('value')) return promise;
  
  const observableGetter = function() {
    return; // this is the default value of the unresolved promise
  }

  observableGetter.getObserver = function(promise) {
    return {
      subscribe: function(context, binding) {
        promise.then(value => binding.updateTarget(value));
      }
    }
  }
  
  Object.defineProperty(promise, 'value', {
    get: observableGetter,
    enumerable: true,
    configurable: true
  })
  
  return promise;
}

export function asyncBindings(definition) {
  if (definition) {
    definition.prototype.async = enhancePromiseForAureliaBinding;
  }
}