/**
 * add suffix to string
 *
 * @since 5.14.0
 * @category String
 * @param str to be processed string
 * @param suffix prefix string
 *
 * @see [[addPrefix]]
 *
 *
 * ```js
 * addSuffix("123456", "456")
 * // => '123456'
 * addSuffix("123", "123")
 * // => '123456'
 * ```
 *
 */
export declare function addSuffix(str?: string, suffix?: string): string;
/**
 * @since 5.14.0
 * @category String
 * @ignore
 */
export declare const appendSuffix: typeof addSuffix;
export default addSuffix;