@omneedia/socketcluster/sample/node_modules/rxjs/src/add/operator/pairwise.ts

SocketCluster - A Highly parallelized WebSocket server cluster to make the most of multi-core machines/instances.

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

Observable.prototype.pairwise = pairwise;

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