trigger property
Trigger is the root of the step tree — how the flow starts, and the action chain that follows. Optional: a flow may be created empty and edited later.
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
FlowTrigger? trigger;