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

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

import { Observable } from '../../Observable';
import { _catch } from '../../operator/catch';

Observable.prototype.catch = _catch;
Observable.prototype._catch = _catch;

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