Function asCache

(
    reducer: {
      (
        state: CacheState | undefined,
        action: any,
        kind: Kind
      ): {
        // id => entry
        entries: {}
        // id => status
        statuses: {}
        // uid => id
        uids: {}
      }
      (arg0: any, arg1: any): any
    },
    kind: Kind
  )