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

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

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