justCache function
void
justCache()
Implementation
void justCache() async {
// it will just retrieve data async
CacheManager<FaKeData> cacheManager = CacheManager<FaKeData>.justCache(
key: 'your key',
serializerFunc: (data) => Future.value(FaKeData.fromJson(data)),);
FaKeData? faKeData = await cacheManager();
}