Interface FavoritesAPI

web/src/scripts/favorites.ts:3–7

const STORAGE_KEY = 'librosgratis-favorites';

export interface FavoritesAPI {
  getFavorites: () => string[];
  toggleFavorite: (bookId: string) => boolean;
  isFavorite: (bookId: string) => boolean;
}

export function getFavorites(): string[] {
  try {