/**
 * A function that returns a list of grouped timezone names.
 *
 * @return - Returns a list of grouped timezone names.
 *
 * @example
 * ```ts-no-run
 * import '@progress/kendo-date-math/timezones/europe-berlin';
 * import '@progress/kendo-date-math/timezones/europe-sofia';
 *
 * timezoneGroupNames(); // ['(GMT+01:00) Amsterdam, Berlin, ...', '(GMT+02:00) Sofia, Tallinn...']
 * ```
 */
export declare const timezoneGroupNames: () => string[];