rxjs-es/src/add/operator/pairwise.ts

Reactive Extensions for modern JavaScript

import { Observable } from '../../Observable';
import { pairwise, PairwiseSignature } from '../../operator/pairwise';

Observable.prototype.pairwise = pairwise;

declare module '../../Observable' {
  interface Observable<T> {
    pairwise: PairwiseSignature<T>;
  }
}