interface Concat {
    (list1: string, list2: string): string;
    <U, V>(list1: ArrayLike<U>, list2: ArrayLike<V>): (U | V)[];
    (list1: string): (list2: string) => string;
    <U>(list1: ArrayLike<U>): <V>(list2: ArrayLike<V>) => (U | V)[];
}
/**
 * Returns the result of concatenating the given arrays or strings.
 *
 * @param {Array|String} a The first list
 * @param {Array|String} b The second list
 * @return {Array|String} A list consisting of the elements of `firstList` followed by the elements of
 * `secondList`.
 *
 * @example
 *
 *      concat('ABC', 'DEF'); // 'ABCDEF'
 *      concat([4, 5, 6], [1, 2, 3]); //=> [4, 5, 6, 1, 2, 3]
 *      concat([], []); //=> []
 */
declare const _default: Concat;
export default _default;