/**
 * Validate date format (YYYY-MM-DD)
 */
export declare const isValidDateFormat: (date: string) => boolean;
/**
 * Build the complete API URL with date
 */
export declare const buildApiUrl: (apiUrl: string, date: string) => string;
/**
 * Get error message for different error types
 */
export declare const getErrorMessage: (error: any) => string;