export declare class FavoritesManager {
    #private;
    static get instance(): FavoritesManager;
    private constructor();
    setFavorite(id: string, value: boolean): void;
    favorites: string[];
    static setFavorite(id: string, value: boolean): void;
    isFavorite(id: string): boolean;
    static isFavorite(id: string): boolean;
    clearFavorites(): void;
    static clearFavorites(): void;
    protected saveFavorites(): void;
}