The list of features as an enum to uniquely type each HydrationFeature.
API
enum HydrationFeatureKind {
NoHttpTransferCache: HydrationFeatureKind.NoHttpTransferCache;
HttpTransferCacheOptions: HydrationFeatureKind.HttpTransferCacheOptions;
I18nSupport: HydrationFeatureKind.I18nSupport;
EventReplay: HydrationFeatureKind.EventReplay;
IncrementalHydration: HydrationFeatureKind.IncrementalHydration;
}