RawReceivePort factory constructor
RawReceivePort(Opens a long-lived port for receiving messages.
A RawReceivePort is low level and does not work with Zones. It can not be paused. The data-handler must be set before the first event is received.
Source
external factory RawReceivePort([void handler(event)]);
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https://api.dartlang.org/stable/1.24.3/dart-isolate/RawReceivePort/RawReceivePort.html