EventInvokerRegistrar<T> typedef
EventInvokerRegistrar<T> =
void Function(dynamic self, EventInvoker<T> invoker)
A callback callback. Allows an external source to pass in hook, so that the internal code can provide what execution is supposed to occur when that hook is fired.
Implementation
typedef EventInvokerRegistrar<T> = void Function(
dynamic self, EventInvoker<T> invoker);