/**
 * Merges multiple sorted iterators into a single sorted iterator using a custom frame processing function.
 *
 * @template T - The type of elements in the iterators.
 * @param {AsyncIterableIterator<T>[]} iterators - An array of sorted iterators to be merged.
 * @param {(elements: (T | null)[]) => { yieldIndex: number | null, purgeIndexes: number[] }} frameProcessFunction -
 *        A function that processes the current frame of elements from each iterator and determines which element to yield next
 *        and which iterators to purge.
 * @returns {AsyncIterableIterator<T>} - An iterator that yields elements in sorted order from the merged iterators.
 * @throws {Error} - Throws an error if the frame processing function is indecisive, which could lead to an infinite loop.
 */
export declare function kWayMergeAsync<T>(iterators: AsyncIterableIterator<T>[], frameProcessFunction: (elements: (T | null)[]) => {
    yieldIndex: number | null;
    purgeIndexes: number[];
}): AsyncIterableIterator<T>;