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+import { MonoTypeOperatorFunction, SchedulerLike } from '../types';
+import { operate } from '../util/lift';
+
+/**
+ * Asynchronously subscribes Observers to this Observable on the specified {@link SchedulerLike}.
+ *
+ * With `subscribeOn` you can decide what type of scheduler a specific Observable will be using when it is subscribed to.
+ *
+ * Schedulers control the speed and order of emissions to observers from an Observable stream.
+ *
+ * ![](subscribeOn.png)
+ *
+ * ## Example
+ *
+ * Given the following code:
+ *
+ * ```ts
+ * import { of, merge } from 'rxjs';
+ *
+ * const a = of(1, 2, 3);
+ * const b = of(4, 5, 6);
+ *
+ * merge(a, b).subscribe(console.log);
+ *
+ * // Outputs
+ * // 1
+ * // 2
+ * // 3
+ * // 4
+ * // 5
+ * // 6
+ * ```
+ *
+ * Both Observable `a` and `b` will emit their values directly and synchronously once they are subscribed to.
+ *
+ * If we instead use the `subscribeOn` operator declaring that we want to use the {@link asyncScheduler} for values emitted by Observable `a`:
+ *
+ * ```ts
+ * import { of, subscribeOn, asyncScheduler, merge } from 'rxjs';
+ *
+ * const a = of(1, 2, 3).pipe(subscribeOn(asyncScheduler));
+ * const b = of(4, 5, 6);
+ *
+ * merge(a, b).subscribe(console.log);
+ *
+ * // Outputs
+ * // 4
+ * // 5
+ * // 6
+ * // 1
+ * // 2
+ * // 3
+ * ```
+ *
+ * The reason for this is that Observable `b` emits its values directly and synchronously like before
+ * but the emissions from `a` are scheduled on the event loop because we are now using the {@link asyncScheduler} for that specific Observable.
+ *
+ * @param scheduler The {@link SchedulerLike} to perform subscription actions on.
+ * @param delay A delay to pass to the scheduler to delay subscriptions
+ * @return A function that returns an Observable modified so that its
+ * subscriptions happen on the specified {@link SchedulerLike}.
+ */
+export function subscribeOn<T>(scheduler: SchedulerLike, delay: number = 0): MonoTypeOperatorFunction<T> {
+  return operate((source, subscriber) => {
+    subscriber.add(scheduler.schedule(() => source.subscribe(subscriber), delay));
+  });
+}