/**
 * Truncates a string to a specified length and adds an ellipsis if truncated
 */
export declare function truncate(str: string, length: number): string;
/**
 * Converts a string to title case
 */
export declare function toTitleCase(str: string): string;
/**
 * Removes all whitespace from a string
 */
export declare function removeWhitespace(str: string): string;
/**
 * Converts a string to kebab case
 */
export declare function toKebabCase(str: string): string;
/**
 * Checks if a string is a valid email address
 */
export declare function isValidEmail(email: string): boolean;
/**
 * Generates a random string of specified length
 */
export declare function generateRandomString(length: number): string;