import { CapitalizeOptions } from '../types';
/**
 * Capitalizes words in a string based on specified options.
 * @param str - The string to capitalize
 * @param options - Configuration options for capitalization
 * @returns The capitalized string
 * @throws {Error} If str is null or undefined
 */
export declare function capitalizeWords(str: string, options?: CapitalizeOptions): string;