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

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

import { Observable } from '../../Observable';
import { concat as concatStatic } from '../../observable/concat';

Observable.concat = concatStatic;

declare module '../../Observable' {
  namespace Observable {
    export let concat: typeof concatStatic;
  }
}