--- /dev/null
+import { Operator } from '../Operator';
+import { Subscriber } from '../Subscriber';
+import { Observable } from '../Observable';
+import { Subscription } from '../Subscription';
+import { OuterSubscriber } from '../OuterSubscriber';
+import { InnerSubscriber } from '../InnerSubscriber';
+import { subscribeToResult } from '../util/subscribeToResult';
+import { MonoTypeOperatorFunction, TeardownLogic } from '../types';
+
+/* tslint:disable:max-line-length */
+/** @deprecated In future versions, empty notifiers will no longer re-emit the source value on the output observable. */
+export function delayWhen<T>(delayDurationSelector: (value: T, index: number) => Observable<never>, subscriptionDelay?: Observable<any>): MonoTypeOperatorFunction<T>;
+export function delayWhen<T>(delayDurationSelector: (value: T, index: number) => Observable<any>, subscriptionDelay?: Observable<any>): MonoTypeOperatorFunction<T>;
+/* tslint:disable:max-line-length */
+
+/**
+ * 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` time 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 source value as
+ * argument, and should return an Observable, called the "duration" Observable.
+ * The source value is emitted on the output Observable only when the duration
+ * Observable emits a value or completes.
+ * The completion of the notifier triggering the emission of the source value
+ * is deprecated behavior and will be removed in future versions.
+ *
+ * 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, interval } from 'rxjs';
+ * import { delayWhen } from 'rxjs/operators';
+ *
+ * const clicks = fromEvent(document, 'click');
+ * const delayedClicks = clicks.pipe(
+ * delayWhen(event => 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 {function(value: T, index: number): Observable} delayDurationSelector A function that
+ * returns an Observable for each value emitted by the source Observable, which
+ * is then used to delay the emission of that item on the output Observable
+ * until the Observable returned from this function emits a value.
+ * @param {Observable} subscriptionDelay An Observable that triggers the
+ * subscription to the source Observable once it emits any value.
+ * @return {Observable} An Observable that delays the emissions of the source
+ * Observable by an amount of time specified by the Observable returned by
+ * `delayDurationSelector`.
+ * @method delayWhen
+ * @owner Observable
+ */
+export function delayWhen<T>(delayDurationSelector: (value: T, index: number) => Observable<any>,
+ subscriptionDelay?: Observable<any>): MonoTypeOperatorFunction<T> {
+ if (subscriptionDelay) {
+ return (source: Observable<T>) =>
+ new SubscriptionDelayObservable(source, subscriptionDelay)
+ .lift(new DelayWhenOperator(delayDurationSelector));
+ }
+ return (source: Observable<T>) => source.lift(new DelayWhenOperator(delayDurationSelector));
+}
+
+class DelayWhenOperator<T> implements Operator<T, T> {
+ constructor(private delayDurationSelector: (value: T, index: number) => Observable<any>) {
+ }
+
+ call(subscriber: Subscriber<T>, source: any): TeardownLogic {
+ return source.subscribe(new DelayWhenSubscriber(subscriber, this.delayDurationSelector));
+ }
+}
+
+/**
+ * We need this JSDoc comment for affecting ESDoc.
+ * @ignore
+ * @extends {Ignored}
+ */
+class DelayWhenSubscriber<T, R> extends OuterSubscriber<T, R> {
+ private completed: boolean = false;
+ private delayNotifierSubscriptions: Array<Subscription> = [];
+ private index: number = 0;
+
+ constructor(destination: Subscriber<T>,
+ private delayDurationSelector: (value: T, index: number) => Observable<any>) {
+ super(destination);
+ }
+
+ notifyNext(outerValue: T, innerValue: any,
+ outerIndex: number, innerIndex: number,
+ innerSub: InnerSubscriber<T, R>): void {
+ this.destination.next(outerValue);
+ this.removeSubscription(innerSub);
+ this.tryComplete();
+ }
+
+ notifyError(error: any, innerSub: InnerSubscriber<T, R>): void {
+ this._error(error);
+ }
+
+ notifyComplete(innerSub: InnerSubscriber<T, R>): void {
+ const value = this.removeSubscription(innerSub);
+ if (value) {
+ this.destination.next(value);
+ }
+ this.tryComplete();
+ }
+
+ protected _next(value: T): void {
+ const index = this.index++;
+ try {
+ const delayNotifier = this.delayDurationSelector(value, index);
+ if (delayNotifier) {
+ this.tryDelay(delayNotifier, value);
+ }
+ } catch (err) {
+ this.destination.error(err);
+ }
+ }
+
+ protected _complete(): void {
+ this.completed = true;
+ this.tryComplete();
+ this.unsubscribe();
+ }
+
+ private removeSubscription(subscription: InnerSubscriber<T, R>): T {
+ subscription.unsubscribe();
+
+ const subscriptionIdx = this.delayNotifierSubscriptions.indexOf(subscription);
+ if (subscriptionIdx !== -1) {
+ this.delayNotifierSubscriptions.splice(subscriptionIdx, 1);
+ }
+
+ return subscription.outerValue;
+ }
+
+ private tryDelay(delayNotifier: Observable<any>, value: T): void {
+ const notifierSubscription = subscribeToResult(this, delayNotifier, value);
+
+ if (notifierSubscription && !notifierSubscription.closed) {
+ const destination = this.destination as Subscription;
+ destination.add(notifierSubscription);
+ this.delayNotifierSubscriptions.push(notifierSubscription);
+ }
+ }
+
+ private tryComplete(): void {
+ if (this.completed && this.delayNotifierSubscriptions.length === 0) {
+ this.destination.complete();
+ }
+ }
+}
+
+/**
+ * We need this JSDoc comment for affecting ESDoc.
+ * @ignore
+ * @extends {Ignored}
+ */
+class SubscriptionDelayObservable<T> extends Observable<T> {
+ constructor(public source: Observable<T>, private subscriptionDelay: Observable<any>) {
+ super();
+ }
+
+ /** @deprecated This is an internal implementation detail, do not use. */
+ _subscribe(subscriber: Subscriber<T>) {
+ this.subscriptionDelay.subscribe(new SubscriptionDelaySubscriber(subscriber, this.source));
+ }
+}
+
+/**
+ * We need this JSDoc comment for affecting ESDoc.
+ * @ignore
+ * @extends {Ignored}
+ */
+class SubscriptionDelaySubscriber<T> extends Subscriber<T> {
+ private sourceSubscribed: boolean = false;
+
+ constructor(private parent: Subscriber<T>, private source: Observable<T>) {
+ super();
+ }
+
+ protected _next(unused: any) {
+ this.subscribeToSource();
+ }
+
+ protected _error(err: any) {
+ this.unsubscribe();
+ this.parent.error(err);
+ }
+
+ protected _complete() {
+ this.unsubscribe();
+ this.subscribeToSource();
+ }
+
+ private subscribeToSource(): void {
+ if (!this.sourceSubscribed) {
+ this.sourceSubscribed = true;
+ this.unsubscribe();
+ this.source.subscribe(this.parent);
+ }
+ }
+}
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