toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (origin != null) 'origin': origin!,
if (routeModifiers != null) 'routeModifiers': routeModifiers!,
if (routingPreference != null) 'routingPreference': routingPreference!,
if (travelMode != null) 'travelMode': travelMode!,
};