/**
 * Utility functions for validation
 */
/**
 * Validate that a string is a valid URL
 * @throws Error if URL is invalid
 */
export declare function validateUrl(urlString: string, paramName?: string): void;
/**
 * Parse CLI argument that may be in format --option=value or --option value
 * @param args Full argument array
 * @param currentIndex Current index in args array
 * @param optionName Name of the option (for error messages)
 * @returns Tuple of [value, newIndex]
 * @throws Error if value is missing
 */
export declare function parseCliArgument(args: string[], currentIndex: number, optionName: string): [string, number];
/**
 * Format error message from unknown error type
 */
export declare function formatError(error: unknown): string;
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