text: /** PURE_IMPORTS_START .._operators_windowWhen PURE_IMPORTS_END */
  import { windowWhen as higherOrder } from '../operators/windowWhen'
  /**
   * Branch out the source Observable values as a nested Observable using a
   * factory function of closing Observables to determine when to start a new
   * window.
   *
   * <span class="informal">It's like {@link bufferWhen}, but emits a nested
   * Observable instead of an array.</span>
   *
   * <img src="./img/windowWhen.png" width="100%">
   *
   * Returns an Observable that emits windows of items it collects from the source
   * Observable. The output Observable emits connected, non-overlapping windows.
   * It emits the current window and opens a new one whenever the Observable
   * produced by the specified `closingSelector` function emits an item. The first
   * window is opened immediately when subscribing to the output Observable.
   *
   * @example <caption>Emit only the first two clicks events in every window of [1-5] random seconds</caption>
   * var clicks = Rx.Observable.fromEvent(document, 'click');
   * var result = clicks
   *   .windowWhen(() => Rx.Observable.interval(1000 + Math.random() * 4000))
   *   .map(win => win.take(2)) // each window has at most 2 emissions
   *   .mergeAll(); // flatten the Observable-of-Observables
   * result.subscribe(x => console.log(x));
   *
   * @see {@link window}
   * @see {@link windowCount}
   * @see {@link windowTime}
   * @see {@link windowToggle}
   * @see {@link bufferWhen}
   *
   * @param {function(): Observable} closingSelector A function that takes no
   * arguments and returns an Observable that signals (on either `next` or
   * `complete`) when to close the previous window and start a new one.
   * @return {Observable<Observable<T>>} An observable of windows, which in turn
   * are Observables.
   * @method windowWhen
   * @owner Observable
   */
  export function windowWhen (closingSelector) {
    return higherOrder(closingSelector)(this)
  }
  // # sourceMappingURL=windowWhen.js.map
  