on method Null safety

void on(
  1. String event,
  2. Function handler
)

This function binds the handler as a listener to the event

Implementation

void on(String event, Function handler) {
  if (recurrentEvents.containsKey(event)) {
    recurrentEvents[event]!.add(handler);
  } else {
    recurrentEvents[event] = [handler];
  }
}