/**
 * Converts a string to title case.
 * @param str - The string to convert.
 * @returns The string in title case.
 */
export declare function toTitleCase(str: string): string;
/**
 * Capitalizes the first letter of each word in a string.
 * @param str - The string to capitalize.
 * @returns The string with each word capitalized.
 */
export declare function capitalizeWords(str: string): string;
/**
 * Trims excessive whitespace and leading/trailing spaces from a string.
 * @param str - The string to trim.
 * @returns The trimmed string.
 */
export declare function trimText(str: string): string;
/**
 * Capitalizes the first letter of a string.
 * @param str - The string to capitalize.
 * @returns The string with the first letter capitalized.
 */
export declare function capitalizeFirstLetter(str: string): string;
/**
 * Counts the number of words in a string.
 * @param str - The string to count words in.
 * @returns The number of words.
 */
export declare function countWords(str: string): number;
/**
 * Removes special characters from a string.
 * @param str - The string to clean.
 * @returns The cleaned string.
 */
export declare function removeSpecialChars(str: string): string;
/**
 * Converts a string to snake_case.
 * @param str - The string to convert.
 * @returns The string in snake_case.
 */
export declare function toSnakeCase(str: string): string;
/**
 * Converts a string to kebab-case.
 * @param str - The string to convert.
 * @returns The string in kebab-case.
 */
export declare function toKebabCase(str: string): string;
/**
 * Repeats a string a specified number of times.
 * @param str - The string to repeat.
 * @param times - The number of times to repeat.
 * @returns The repeated string.
 */
export declare function repeatString(str: string, times: number): string;
/**
 * Checks if a string is a palindrome.
 * @param str - The string to check.
 * @returns True if the string is a palindrome, false otherwise.
 */
export declare function isPalindrome(str: string): boolean;