/**
 * Appends the correct ordinal suffix to a number.
 *
 * @example
 * addOrdinal(1) // "1st"
 * addOrdinal(2) // "2nd"
 * addOrdinal(3) // "3rd"
 * addOrdinal(4) // "4th"
 * addOrdinal(11) // "11th"
 * @param {number} num
 * @returns {string}
 */
export declare function addOrdinal(num: number): string;