/**
 * Returns the ordinal suffix for a given number.
 *
 * @example
 * ```ts
 * getOrdinalSuffix(1)  // "st"
 * getOrdinalSuffix(2)  // "nd"
 * getOrdinalSuffix(3)  // "rd"
 * getOrdinalSuffix(4)  // "th"
 * getOrdinalSuffix(11) // "th"
 * getOrdinalSuffix(21) // "st"
 * ```
 */
export declare const getOrdinalSuffix: (num: number) => string;