postEvent function
Post an event of eventKind
with payload of eventData
to the Extension
event stream.
Implementation
void postEvent(String eventKind, Map eventData) {
ArgumentError.checkNotNull(eventKind, 'eventKind');
ArgumentError.checkNotNull(eventData, 'eventData');
String eventDataAsString = json.encode(eventData);
_postEvent(eventKind, eventDataAsString);
}