- [String debugName = '']
Opens a long-lived port for receiving messages.
A ReceivePort is a non-broadcast stream. This means that it buffers incoming messages until a listener is registered. Only one listener can receive messages. See Stream.asBroadcastStream for transforming the port to a broadcast stream.
debugName parameter can be set to associate a name with
this port that can be displayed in tooling.
A receive port is closed by canceling its subscription.
external factory ReceivePort