ExtendableMessageEventInit constructor
      
      ExtendableMessageEventInit({ 
    
    
- dynamic data,
- String? lastEventId,
- String? origin,
- List<MessagePort> ? ports,
- dynamic source,
Implementation
factory ExtendableMessageEventInit({
  _i2.dynamic data,
  _i2.String? lastEventId,
  _i2.String? origin,
  _i2.List<_i3.MessagePort>? ports,
  _i2.dynamic source,
}) =>
    ExtendableMessageEventInit._(
      data: data,
      lastEventId: lastEventId,
      origin: origin,
      ports: ports,
      source: source,
    );