import { IterableX } from '../iterable';
/**
 * Returns a new sequence that triggers on the second and subsequent triggerings of the input sequence.
 * @param {Iterable<T>} source Source sequence.
 * @return {Iterable<T[]>} A sequence that triggers on successive pairs of iterations from the input sequence.
 */
export declare function pairwise<TSource>(source: Iterable<TSource>): IterableX<TSource[]>;