event property
Event is the durable control event the command became. The intent is recorded whether or not it reached an engine, which is what makes a stream-consuming surface able to act on it.
Please note: This property should have been non-nullable! Since the specification file does not include a default value (using the "default:" property), however, the generated source code must fall back to having a nullable type. Consider adding a "default:" property in the specification file to hide this note.
Implementation
EventView? event;