const storeThreadInfo = storeThreadInfos[update.threadID];

let updatedThread;
if (storeThreadInfo.minimallyEncoded) {
  updatedThread = {
    ...storeThreadInfo,
    currentUser: {
      ...storeThreadInfo.currentUser,
      unread: update.unread,
    },
  };
} else {
  updatedThread = {
    ...storeThreadInfo,
    currentUser: {
      ...storeThreadInfo.currentUser,
      unread: update.unread,
    },
  };
}

return [
  {
    type: 'replace',
    payload: {
      id: update.threadID,
      threadInfo: updatedThread,
    },
  },
];