chore: move comment into TSDoc

src/internal/util/subscribeWith.ts

@@ -2,35 +2,43 @@ import { Observable } from '../Observable';
 import { Subscriber } from '../Subscriber';
 import { Subscription } from '../Subscription';
 
+/**
+ * Subscribes a subscriber to an observable and ensures the subscriber is
+ * returned as the subscription.
+ *
+ * When an instance of a subscriber from within this package is passed to the
+ * subscribe method of an observable from within this package, the returned
+ * subscription is the subscriber instance.
+ *
+ * Operator implementations depend upon this behaviour, so it's important
+ * that interop subscribers and observables behave in a similar manner. If
+ * they do not, unsubscription chains can be broken.
+ *
+ * This function ensures that if the subscription returned from the subscribe
+ * call is not the subscriber itself, the subscription is added to the
+ * subscriber and the subscriber is returned. Doing so will ensure that the
+ * unsubscription chain is not broken.
+ *
+ * This function needs to be used wherever an interop observable or
+ * subscriber could be encountered. There are two such places:
+ * - within `subscribeToObservable`; and
+ * - within the `call` method of each operator's `Operator` class.
+ *
+ * Within `subscribeToObservable` the observables are almost always going to
+ * be interop - as they're obtained via the `Symbol.observable` property.
+ *
+ * Within the `call` method, the operator's subscriber will be interop -
+ * relative to the source observable - if the operator is imported from a
+ * package that uses a different version of RxJS.
+ *
+ * @param observable the observable to subscribe to
+ * @param subscriber the subscriber to be subscribed
+ * @returns the passed-in subscriber (as the subscription)
+ */
 export function subscribeWith<T>(
   observable: Observable<T>,
   subscriber: Subscriber<T>
 ): Subscription {
-  // When an instance of a subscriber from within this package is passed to the
-  // subscribe method of an observable from within this package, the returned
-  // subscription is the subscriber instance.
-  //
-  // Operator implementations depend upon this behaviour, so it's important
-  // that interop subscribers and observables behave in a similar manner. If
-  // they do not, unsubscription chains can be broken.
-  //
-  // This function ensures that if the subscription returned from the subscribe
-  // call is not the subscriber itself, the subscription is added to the
-  // subscriber and the subscriber is returned. Doing so will ensure that the
-  // unsubscription chain is not broken.
-  //
-  // This function needs to be used wherever an interop observable or
-  // subscriber could be encountered. There are two such places:
-  //
-  // - within `subscribeToObservable`; and
-  // - within the `call` method of each operator's `Operator` class.
-  //
-  // Within `subscribeToObservable` the observables are almost always going to
-  // be interop - as they're obtained via the `Symbol.observable` property.
-  //
-  // Within the `call` method, the operator's subscriber will be interop -
-  // relative to the source observable - if the operator is imported from a
-  // package that uses a different version of RxJS.
   const subscription = observable.subscribe(subscriber);
   if (subscription !== subscriber) {
     subscriber.add(subscription);