/**
 * Formatting utilities for time, progress bars, and other display elements
 */
/**
 * Format time in minutes and seconds
 */
export declare function formatTime(timeInMinutes: number): string;
/**
 * Format duration in hours, minutes, and seconds
 */
export declare function formatDuration(seconds: number): string;
/**
 * Create a visual progress bar
 */
export declare function createProgressBar(ratio: number, validSource?: boolean): string;
/**
 * Calculate percentage change between two numbers
 */
export declare function calculateChange(from: number, to: number): string;