addObserver method
Implementation
void addObserver(
String name, RouteLifecycleStateChanged routeLifecycleStateChanged) {
routeLifecycleDidChanges[getKey(name, routeLifecycleStateChanged)] =
routeLifecycleStateChanged;
}
void addObserver(
String name, RouteLifecycleStateChanged routeLifecycleStateChanged) {
routeLifecycleDidChanges[getKey(name, routeLifecycleStateChanged)] =
routeLifecycleStateChanged;
}