The callback which is called when the stream is resumed.
May be set to null, in which case no callback will happen.
Pause related callbacks are not supported on broadcast stream controllers.
ControllerCallback get onResume;
void set onResume(void onResumeHandler());
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Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dart.dev/stable/2.5.0/dart-async/StreamController/onResume.html