added in version 27.1.0


AsyncDifferConfig<T> Configuration object for ListAdapter, AsyncListDiffer, and similar background-thread list diffing adapter logic. 
AsyncDifferConfig.Builder<T> Builder class for AsyncDifferConfig
AsyncListDiffer<T> Helper for computing the difference between two lists via DiffUtil on a background thread. 
ListAdapter<T, VH extends RecyclerView.ViewHolder> RecyclerView.Adapter base class for presenting List data in a RecyclerView, including computing diffs between Lists on a background thread.