text: export default function ExceptionThrownEvent (exception, isCancelled = false) {
    return Object.seal({
      get _eventType () {
        return 'ExceptionThrownEvent'
      },
      exception,
      isCancelled () {
        return isCancelled
      },
      setCancelled (cancelled) {
        isCancelled = cancelled
      }
    })
  }
  