/**
 * Format a date for display
 */
export declare function formatDate(isoDate?: string): string;
/**
 * Format a relative time for display
 */
export declare function formatTime(isoDate: string): string;
/**
 * Capitalize the first letter of a string
 */
export declare function capitalizeFirst(str: string): string;
/**
 * Truncate a string to a maximum length
 */
export declare function truncate(str: string, maxLength: number): string;
/**
 * Format a number with commas
 */
export declare function formatNumber(num: number): string;
/**
 * Format bytes to human readable size
 */
export declare function formatBytes(bytes: number): string;
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