$on method
The $on() method allows you to subscribe to events.
All message use a Exception class wrapper.
Example:
prisma.$on({PrismaLogLevel.query}, (e) {
  if (e is PrismaQueryEvent) {
    print(e.query);
  }
});
Implementation
void $on(Event event, Listener listener) =>
    _engine.logger.on(event, listener);