@reactivex/rxjs/compat/add/operator/zip.ts

Reactive Extensions for modern JavaScript

import { Observable } from 'rxjs';
import { zipProto } from '../../operator/zip';

(Observable as any).prototype.zip = zipProto;

declare module 'rxjs/internal/Observable' {
  interface Observable<T> {
    zip: typeof zipProto;
  }
}