import { Pipeline } from '../types';
/**
 * Decorator that returns the previous and current value as array
 *
 * @param {Pipeline.StepFunction<TIn, TOut>} fn - selector function to select the array to loop
 * @returns {Pipeline.StepFunction<TIn, [TIn, TOut]>}
 *
 * @example
 *
 * const { pairwise, step, pipe } =  require('@axa/bautajs-core');
 *
 *  const getMovie = step(() => ({ name: 'star wars' }));
 *   const getMovieImdbIdAsync = step<{ name: string }, string>(() => Promise.resolve('imdb12354'));
 *
 *   const pipeline = pipe(getMovie, pairwise(getMovieImdbIdAsync), ([movie, imdbId]) => ({
 *     ...movie,
 *     imdb_id: imdbId
 *   }));
 *
 */
export declare function pairwise<TIn, TOut>(fn: Pipeline.StepFunction<TIn, TOut>): Pipeline.StepFunction<TIn, [TIn, TOut]>;
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