export type ThemesHash<T> = {
    [index: string]: T | boolean;
    __surveyjs_internal_themes_hash: boolean;
};
export declare function registerTheme<T>(registerThemeCallback: (theme: T) => void, ...themes: Array<T | ThemesHash<T>>): void;
export declare function sortDefaultThemes(defaultThemesOrder: Array<string>, themes: Array<string>, resultArray: Array<string>): void;