routes function Null safety

Future routes(
  1. String cityName,
  2. BaseCacheManager cacheManager
)

Get a map of route ids to route info maps..

Implementation

Future<dynamic> routes(String cityName, BaseCacheManager cacheManager) async {
  File routesFile = await cacheManager
      .getSingleFile("$apiBaseUrl/$cityName/$apiVersion/route");
  String routesJson = await routesFile.readAsString();

  return jsonDecode(routesJson);
}