/**
 * String Formatter Utility
 * String, phone, file size, and duration formatting functions
 */
/**
 * File size formatting options
 */
export interface FileSizeFormatOptions {
    decimals?: number;
    locale?: string;
}
/**
 * Formats a file size in bytes to human-readable format
 *
 * @param bytes - File size in bytes
 * @param options - Formatting options
 * @returns Formatted file size string
 */
export declare function formatFileSize(bytes: number, options?: FileSizeFormatOptions): string;
/**
 * Duration formatting options
 */
export interface DurationFormatOptions {
    format?: 'short' | 'long' | 'digital';
}
/**
 * Formats a duration in seconds to human-readable format
 *
 * @param seconds - Duration in seconds
 * @param options - Formatting options
 * @returns Formatted duration string
 */
export declare function formatDuration(seconds: number, options?: DurationFormatOptions): string;
/**
 * Phone number formatting options
 */
export interface PhoneFormatOptions {
    format?: 'national' | 'international' | 'e164';
    countryCode?: string;
}
/**
 * Formats a phone number
 *
 * @param phone - Phone number string (digits only)
 * @param options - Formatting options
 * @returns Formatted phone number string
 */
export declare function formatPhone(phone: string, options?: PhoneFormatOptions): string;
/**
 * Truncates text to a maximum length with ellipsis
 *
 * @param text - Text to truncate
 * @param maxLength - Maximum length
 * @param suffix - Suffix to add (default: '...')
 * @returns Truncated text
 */
export declare function truncateText(text: string, maxLength: number, suffix?: string): string;
/**
 * Capitalizes the first letter of a string
 *
 * @param text - Text to capitalize
 * @returns Capitalized text
 */
export declare function capitalize(text: string): string;
/**
 * Converts a string to title case
 *
 * @param text - Text to convert
 * @returns Title case text
 */
export declare function toTitleCase(text: string): string;
/**
 * Converts a string to slug format
 *
 * @param text - Text to convert
 * @returns Slug string
 */
export declare function toSlug(text: string): string;