/**
 * @param {number} aCodePoint
 * @returns {number}
 */
export function utf16LengthForCodePoint(aCodePoint: number): number;
/**
 * Compares two JavaScript strings as if they were UTF-8 encoded byte arrays.
 *
 * Fast path: for strings without surrogate pairs (BMP-only), JS code-unit
 * order is identical to UTF-8 byte order, so native `<` suffices. For longer
 * strings the regex check is cheaper than scanning char-by-char; 16 is the
 * empirically-derived crossover point.
 *
 * @param {string} a
 * @param {string} b
 * @returns {number}
 */
export function compareUTF8(a: string, b: string): number;
/**
 * @param {string} a
 * @param {string} b
 * @returns {boolean}
 */
export function greaterThan(a: string, b: string): boolean;
/**
 * @param {string} a
 * @param {string} b
 * @returns {boolean}
 */
export function greaterThanEq(a: string, b: string): boolean;
/**
 * @param {string} a
 * @param {string} b
 * @returns {boolean}
 */
export function lessThan(a: string, b: string): boolean;
/**
 * @param {string} a
 * @param {string} b
 * @returns {boolean}
 */
export function lessThanEq(a: string, b: string): boolean;