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+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 concurrent 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);
+}