Function useWorkspaceUnread

src/browser/hooks/useWorkspaceUnread.ts:9–29

(workspaceId: string)

 * Returns { isUnread, lastReadTimestamp, recencyTimestamp } for flexibility.
 */
export function useWorkspaceUnread(workspaceId: string): {
  isUnread: boolean;
  lastReadTimestamp: number | null;
  recencyTimestamp: number | null;
} {
  // Missing lastRead means this workspace has no persisted read baseline yet.
  // Treat that as "implicitly read" until we observe an explicit read event,
  // instead of coercing to epoch (0) which marks legacy workspaces unread forever.
  const [lastReadTimestamp] = usePersistedState<number | null>(
    getWorkspaceLastReadKey(workspaceId),
    null,
    {
      listener: true,
    }
  );
  const { recencyTimestamp } = useWorkspaceSidebarState(workspaceId);
  const isUnread =
    recencyTimestamp !== null && lastReadTimestamp !== null && recencyTimestamp > lastReadTimestamp;

  return { isUnread, lastReadTimestamp, recencyTimestamp };
}