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

export type OutputFormat = 'terminal' | 'html' | 'json';

export interface FormatterError {
  code: 'SERIALIZE_ERROR' | 'UNKNOWN';
  message: string;
}

export interface IFormatter {
  /**
   * Format items to the specified output format.
   * Returns string for terminal/html/json output.
   */
  format(items: FeedItem[], format: OutputFormat): Promise<string>;
}