import type { FeedItem } from './feed.types.js';

export interface DedupError {
  code: 'CACHE_ERROR' | 'UNKNOWN';
  message: string;
}

export interface IDedup {
  /**
   * Returns only items that have not been seen before.
   * Does NOT mark them as seen - call markSeen() separately.
   */
  filter(items: FeedItem[]): Promise<FeedItem[]>;

  /**
   * Marks items as seen for future deduplication.
   */
  markSeen(items: FeedItem[]): Promise<void>;
}