@reactivex/rxjs/src/add/operator/concatMapTo.ts

Reactive Extensions for modern JavaScript

import {Observable} from '../../Observable';
import {concatMapTo, ConcatMapToSignature} from '../../operator/concatMapTo';

Observable.prototype.concatMapTo = concatMapTo;

declare module '../../Observable' {
  interface Observable<T> {
    concatMapTo: ConcatMapToSignature<T>;
  }
}