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

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

import { concat as concatStatic } from '../../observable/concat';
declare module '../../Observable' {
    namespace Observable {
        let concat: typeof concatStatic;
    }
}