Конструктор фабрики ReceivePort.fromRawReceivePort
ReceivePort.fromRawReceivePort(Создаёт ReceivePort из RawReceivePort.
Обработчик данного rawPort перезаписывается во время создания результата.
Исходный код
external factory ReceivePort.fromRawReceivePort(RawReceivePort rawPort);
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https://api.dartlang.org/stable/1.24.3/dart-isolate/ReceivePort/ReceivePort.fromRawReceivePort.html