on method

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

Listen for a server event. Persisted, so it survives (re)connects and works even if called before the socket is open.

Implementation

void on(String event, NexusEventHandler handler) {
  _handlers[event] = handler;
  _socket?.off(event); // one handler per event, matching [_handlers]
  _socket?.on(event, handler);
}