export type Theme = 'light' | 'dark' | 'sepia';
export type SetThemeOptions = {
    theme: Theme;
    element?: Element;
    selector?: string;
};
export declare const THEME_STORE_KEY = "book-box-theme";
export declare function setTheme(options: SetThemeOptions): void;
/**
 * set theme from localStorage
 */
export declare function setSavedTheme(options?: Omit<SetThemeOptions, 'theme'> & {
    storageKey?: string;
}): void;