defer method
Defer the action execution, if the action is not already executed or canceled. Use onDefer to delay starting your executionDeferral until the action is ready to execute.
Example: asyncEvent.defer(asyncEvent.onDefer.then((_) { return doSomeAsyncThingThatDelaysTheEvent(); });
Implementation
@override
void defer(Future<dynamic> executionDeferral) =>
delegate.defer(executionDeferral);