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

Reactive Extensions for modern JavaScript

import {Observable} from '../../Observable';
import {takeWhile, TakeWhileSignature} from '../../operator/takeWhile';

Observable.prototype.takeWhile = takeWhile;

declare module '../../Observable' {
  interface Observable<T> {
    takeWhile: TakeWhileSignature<T>;
  }
}