addNavigationRule method
void
addNavigationRule({
Adds a NavigationRule to the navigationRule
Map
It only adds the NavigationRule if none is already set for the
StepIdentifier
Implementation
void addNavigationRule(
{required StepIdentifier forTriggerStepIdentifier,
required NavigationRule navigationRule}) {
navigationRules.putIfAbsent(forTriggerStepIdentifier, () => navigationRule);
}