/**
 * Determines whether the given async-iterable is empty.
 *
 * @export
 * @template T The type of elements in the source sequence.
 * @param {Iterable<T>} source The source async-iterable to determine whether it is empty.
 * @returns {boolean} Returns true if the sequence is empty, otherwise false.
 */
export declare function isEmpty<T>(source: Iterable<T>): boolean;