@omneedia/socketcluster/sample/node_modules/rxjs/src/add/observable/empty.ts

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

import { Observable } from '../../Observable';
import { empty as staticEmpty } from '../../observable/empty';

Observable.empty = staticEmpty;

declare module '../../Observable' {
  namespace Observable {
    export let empty: typeof staticEmpty;
  }
}