/**
* Utility functions for strings.
*
* @public
* @module lang/string
*/
/**
 * Adjusts a string, replacing the first character of each word with an uppercase
 * character and all subsequent characters in the word with lowercase characters.
 *
 * @public
 * @static
 * @param {string} s
 * @returns {string}
 */
export function startCase(s: string): string;
/**
 * Adjust a string to use camel case, where the first letter of each word is replaced
 * with a lower case character.
 *
 * @public
 * @static
 * @param {string} s
 * @returns {string}
 */
export function camelCase(s: string): string;
/**
 * If a string exceeds a desired length, it is truncated and a poor man's
 * ellipsis (i.e. three periods) is appended. Otherwise, the original
 * string is returned.
 *
 * @public
 * @static
 * @param {string} s
 * @param {number} length
 * @returns {string}
 */
export function truncate(s: string, length: number): string;
/**
 * Adds leading characters to a string, until the string length is a desired size.
 *
 * @public
 * @static
 * @param {string} s - The string to pad.
 * @param {number} length - The desired overall length of the string.
 * @param {string} character - The character to use for padding.
 * @returns {string}
 */
export function padLeft(s: string, length: number, character: string): string;
/**
 * Replaces starting characters of a string with a mask character and optionally
 * truncates the string.
 *
 * @public
 * @static
 * @param {string} s - The string to format.
 * @param {string} mask - The character to use for masking.
 * @param {number} show - The number of characters to preserve (of the left).
 * @param {number=} length - The final length of the string (truncating characters of the right).
 */
export function mask(s: string, mask: string, show: number, length?: number | undefined): string;
/**
 * Performs a simple token replacement on a string; where the tokens
 * are braced numbers (e.g. {0}, {1}, {2}).
 *
 * @public
 * @static
 * @param {string} s - The string to format (e.g. 'my first name is {0} and my last name is {1}')
 * @param {Array<string>} data - The replacement data
 * @returns {string}
 */
export function format(s: string, ...data: Array<string>): string;