import { OperatorFunction } from '../types';
/**
 * Groups pairs of consecutive emissions together and emits them as an array of
 * two values.
 *
 * <span class="informal">Puts the current value and previous value together as
 * an array, and emits that.</span>
 *
 * ![](pairwise.png)
 *
 * The Nth emission from the source Observable will cause the output Observable
 * to emit an array [(N-1)th, Nth] of the previous and the current value, as a
 * pair. For this reason, `pairwise` emits on the second and subsequent
 * emissions from the source Observable, but not on the first emission, because
 * there is no previous value in that case.
 *
 * ## Example
 * On every click (starting from the second), emit the relative distance to the previous click
 * ```javascript
 * const clicks = fromEvent(document, 'click');
 * const pairs = clicks.pipe(pairwise());
 * const distance = pairs.pipe(
 *   map(pair => {
 *     const x0 = pair[0].clientX;
 *     const y0 = pair[0].clientY;
 *     const x1 = pair[1].clientX;
 *     const y1 = pair[1].clientY;
 *     return Math.sqrt(Math.pow(x0 - x1, 2) + Math.pow(y0 - y1, 2));
 *   }),
 * );
 * distance.subscribe(x => console.log(x));
 * ```
 *
 * @see {@link buffer}
 * @see {@link bufferCount}
 *
 * @return {Observable<Array<T>>} An Observable of pairs (as arrays) of
 * consecutive values from the source Observable.
 * @method pairwise
 * @owner Observable
 */
export declare function pairwise<T>(): OperatorFunction<T, [T, T]>;