hunk.code_window:           actual.push({ frame: this.frame, notification: errorNotification(error) });
           },
           () => {
             actual.push({ frame: this.frame, notification: COMPLETE_NOTIFICATION });
  
hunk.labels: keep keep replace keep
hunk.after_edit:         complete: () => {
  
hunk.file_path: src/internal/testing/TestScheduler.ts
hunk.type: replace
file: import { mergeMap } from './mergeMap';
  import { identity } from '../util/identity';
  import { OperatorFunction, ObservableInput, ObservedValueOf } from '../types';
  
  /**
   * Converts a higher-order Observable into a first-order Observable which
   * concurrently delivers all values that are emitted on the inner Observables.
   *
   * <span class="informal">Flattens an Observable-of-Observables.</span>
   *
   * ![](mergeAll.png)
   *
   * `mergeAll` subscribes to an Observable that emits Observables, also known as
   * a higher-order Observable. Each time it observes one of these emitted inner
   * Observables, it subscribes to that and delivers all the values from the
   * inner Observable on the output Observable. The output Observable only
   * completes once all inner Observables have completed. Any error delivered by
   * a inner Observable will be immediately emitted on the output Observable.
   *
   * ## Examples
   *
   * Spawn a new interval Observable for each click event, and blend their outputs as one Observable
   *
   * ```ts
   * import { fromEvent, map, interval, mergeAll } from 'rxjs';
   *
   * const clicks = fromEvent(document, 'click');
   * const higherOrder = clicks.pipe(map(() => interval(1000)));
   * const firstOrder = higherOrder.pipe(mergeAll());
   *
   * firstOrder.subscribe(x => console.log(x));
   * ```
   *
   * Count from 0 to 9 every second for each click, but only allow 2 concurrent timers
   *
   * ```ts
   * import { fromEvent, map, interval, take, mergeAll } from 'rxjs';
   *
   * const clicks = fromEvent(document, 'click');
   * const higherOrder = clicks.pipe(
   *   map(() => interval(1000).pipe(take(10)))
   * );
   * const firstOrder = higherOrder.pipe(mergeAll(2));
   *
   * firstOrder.subscribe(x => console.log(x));
   * ```
   *
   * @see {@link combineLatestAll}
   * @see {@link concatAll}
   * @see {@link exhaustAll}
   * @see {@link merge}
   * @see {@link mergeMap}
   * @see {@link mergeMapTo}
   * @see {@link mergeScan}
   * @see {@link switchAll}
   * @see {@link switchMap}
   * @see {@link zipAll}
   *
   * @param {number} [concurrent=Infinity] Maximum number of inner
   * Observables being subscribed to concurrently.
   * @return A function that returns an Observable that emits values coming from
   * all the inner Observables emitted by the source Observable.
   */
  export function mergeAll<O extends ObservableInput<any>>(concurrent: number = Infinity): OperatorFunction<O, ObservedValueOf<O>> {
    return mergeMap(identity, concurrent);
  }
  