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+import { Observable } from '../Observable';
+import { MonoTypeOperatorFunction, ObservableInput } from '../types';
+import { concat } from '../observable/concat';
+import { take } from './take';
+import { ignoreElements } from './ignoreElements';
+import { mapTo } from './mapTo';
+import { mergeMap } from './mergeMap';
+import { innerFrom } from '../observable/innerFrom';
+
+/** @deprecated The `subscriptionDelay` parameter will be removed in v8. */
+export function delayWhen<T>(
+  delayDurationSelector: (value: T, index: number) => ObservableInput<any>,
+  subscriptionDelay: Observable<any>
+): MonoTypeOperatorFunction<T>;
+export function delayWhen<T>(delayDurationSelector: (value: T, index: number) => ObservableInput<any>): MonoTypeOperatorFunction<T>;
+
+/**
+ * Delays the emission of items from the source Observable by a given time span
+ * determined by the emissions of another Observable.
+ *
+ * <span class="informal">It's like {@link delay}, but the time span of the
+ * delay duration is determined by a second Observable.</span>
+ *
+ * ![](delayWhen.png)
+ *
+ * `delayWhen` operator shifts each emitted value from the source Observable by
+ * a time span determined by another Observable. When the source emits a value,
+ * the `delayDurationSelector` function is called with the value emitted from
+ * the source Observable as the first argument to the `delayDurationSelector`.
+ * The `delayDurationSelector` function should return an {@link ObservableInput},
+ * that is internally converted to an Observable that is called the "duration"
+ * Observable.
+ *
+ * The source value is emitted on the output Observable only when the "duration"
+ * Observable emits ({@link guide/glossary-and-semantics#next next}s) any value.
+ * Upon that, the "duration" Observable gets unsubscribed.
+ *
+ * Before RxJS V7, the {@link guide/glossary-and-semantics#complete completion}
+ * of the "duration" Observable would have been triggering the emission of the
+ * source value to the output Observable, but with RxJS V7, this is not the case
+ * anymore.
+ *
+ * Only next notifications (from the "duration" Observable) trigger values from
+ * the source Observable to be passed to the output Observable. If the "duration"
+ * Observable only emits the complete notification (without next), the value
+ * emitted by the source Observable will never get to the output Observable - it
+ * will be swallowed. If the "duration" Observable errors, the error will be
+ * propagated to the output Observable.
+ *
+ * Optionally, `delayWhen` takes a second argument, `subscriptionDelay`, which
+ * is an Observable. When `subscriptionDelay` emits its first value or
+ * completes, the source Observable is subscribed to and starts behaving like
+ * described in the previous paragraph. If `subscriptionDelay` is not provided,
+ * `delayWhen` will subscribe to the source Observable as soon as the output
+ * Observable is subscribed.
+ *
+ * ## Example
+ *
+ * Delay each click by a random amount of time, between 0 and 5 seconds
+ *
+ * ```ts
+ * import { fromEvent, delayWhen, interval } from 'rxjs';
+ *
+ * const clicks = fromEvent(document, 'click');
+ * const delayedClicks = clicks.pipe(
+ *   delayWhen(() => interval(Math.random() * 5000))
+ * );
+ * delayedClicks.subscribe(x => console.log(x));
+ * ```
+ *
+ * @see {@link delay}
+ * @see {@link throttle}
+ * @see {@link throttleTime}
+ * @see {@link debounce}
+ * @see {@link debounceTime}
+ * @see {@link sample}
+ * @see {@link sampleTime}
+ * @see {@link audit}
+ * @see {@link auditTime}
+ *
+ * @param delayDurationSelector A function that returns an `ObservableInput` for
+ * each `value` emitted by the source Observable, which is then used to delay the
+ * emission of that `value` on the output Observable until the `ObservableInput`
+ * returned from this function emits a next value. When called, beside `value`,
+ * this function receives a zero-based `index` of the emission order.
+ * @param subscriptionDelay An Observable that triggers the subscription to the
+ * source Observable once it emits any value.
+ * @return A function that returns an Observable that delays the emissions of
+ * the source Observable by an amount of time specified by the Observable
+ * returned by `delayDurationSelector`.
+ */
+export function delayWhen<T>(
+  delayDurationSelector: (value: T, index: number) => ObservableInput<any>,
+  subscriptionDelay?: Observable<any>
+): MonoTypeOperatorFunction<T> {
+  if (subscriptionDelay) {
+    // DEPRECATED PATH
+    return (source: Observable<T>) =>
+      concat(subscriptionDelay.pipe(take(1), ignoreElements()), source.pipe(delayWhen(delayDurationSelector)));
+  }
+
+  return mergeMap((value, index) => innerFrom(delayDurationSelector(value, index)).pipe(take(1), mapTo(value)));
+}