Static factory designed to expose close
events to event handlers that are not necessarily instances of WebSocket.
See EventStreamProvider for usage information.
static const EventStreamProvider<CloseEvent> closeEvent = const EventStreamProvider<CloseEvent>('close')
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Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dartlang.org/stable/2.0.0/dart-html/WebSocket/closeEvent-constant.html