rxjs-es/src/add/operator/scan.ts

Reactive Extensions for modern JavaScript

import { Observable } from '../../Observable';
import { ReduceSignature } from '../../operator/reduce';
import { scan } from '../../operator/scan';

Observable.prototype.scan = scan;

declare module '../../Observable' {
  interface Observable<T> {
    scan: ReduceSignature<T>;
  }
}