@reactivex/rxjs/dist/amd/src/add/operator/merge.ts

Reactive Extensions for modern JavaScript

import {Observable} from '../../Observable';
import {merge, MergeSignature} from '../../operator/merge';

Observable.prototype.merge = merge;

declare module '../../Observable' {
  interface Observable<T> {
    merge: MergeSignature<T>;
  }
}