const unreadCountValue = useSelector(state => 
  computeUnreadCount(state.threadStore.threadInfos, threadID)
);

const computeUnreadCount = (threadInfos, threadID) => {
  return Object.values(threadInfos).filter(
    communityInfo =>
      threadInHomeChatList(communityInfo) &&
      communityInfo.currentUser.unread &&
      (threadID === communityInfo.community || threadID === communityInfo.id)
  ).length;
};