feat(Subscriber.create): Removed.

+ Removes `Subscriber.create`.
+ Removes `SafeSubscriber`, which is no longer necessary.

BREAKING CHANGE: Subscriber.create has been removed. Please use `new Subscriber` instead.

src/internal/Subscriber.ts

@@ -19,25 +19,6 @@ import { isSubscriber } from './util/isSubscriber';
  * @class Subscriber<T>
  */
 export class Subscriber<T> extends Subscription implements Observer<T> {
-  /**
-   * A static factory for a Subscriber, given a (potentially partial) definition
-   * of an Observer.
-   * @param next The `next` callback of an Observer.
-   * @param error The `error` callback of an
-   * Observer.
-   * @param complete The `complete` callback of an
-   * Observer.
-   * @return A Subscriber wrapping the (partially defined)
-   * Observer represented by the given arguments.
-   * @nocollapse
-   * @deprecated Do not use. Will be removed in v8. There is no replacement for this
-   * method, and there is no reason to be creating instances of `Subscriber` directly.
-   * If you have a specific use case, please file an issue.
-   */
-  static create<T>(next?: (x?: T) => void, error?: (e?: any) => void, complete?: () => void): Subscriber<T> {
-    return new SafeSubscriber({ next, error, complete });
-  }
-
   /** @deprecated Internal implementation detail, do not use directly. Will be made internal in v8. */
   protected isStopped: boolean = false;
   /** @deprecated Internal implementation detail, do not use directly. Will be made internal in v8. */
@@ -180,16 +161,6 @@ export function createSafeSubscriber<T>(observerOrNext?: Partial<Observer<T>> |
   return new Subscriber(observerOrNext);
 }
 
-class SafeSubscriber<T> extends Subscriber<T> {
-  constructor(observerOrNext?: Partial<Observer<T>> | ((value: T) => void) | null) {
-    super();
-
-    // Wrap the partial observer to ensure it's a full observer, and
-    // make sure proper error handling is accounted for.
-    this.destination = createSafeObserver(observerOrNext);
-  }
-}
-
 /**
  * An error handler used when no error handler was supplied
  * to the SafeSubscriber -- meaning no error handler was supplied

src/internal/observable/dom/WebSocketSubject.ts

@@ -1,5 +1,5 @@
 import { Subject, AnonymousSubject } from '../../Subject';
-import { Subscriber } from '../../Subscriber';
+import { createSafeSubscriber, Subscriber } from '../../Subscriber';
 import { Observable } from '../../Observable';
 import { Subscription } from '../../Subscription';
 import { Operator } from '../../Operator';
@@ -296,8 +296,8 @@ export class WebSocketSubject<T> extends AnonymousSubject<T> {
 
       const queue = this.destination;
 
-      this.destination = Subscriber.create<T>(
-        (x) => {
+      this.destination = createSafeSubscriber({
+        next: (x: T) => {
           if (socket!.readyState === 1) {
             try {
               const { serializer } = this._config;
@@ -307,7 +307,7 @@ export class WebSocketSubject<T> extends AnonymousSubject<T> {
             }
           }
         },
-        (err) => {
+        error: (err: any) => {
           const { closingObserver } = this._config;
           if (closingObserver) {
             closingObserver.next(undefined);
@@ -319,15 +319,15 @@ export class WebSocketSubject<T> extends AnonymousSubject<T> {
           }
           this._resetState();
         },
-        () => {
+        complete: () => {
           const { closingObserver } = this._config;
           if (closingObserver) {
             closingObserver.next(undefined);
           }
           socket!.close();
           this._resetState();
-        }
-      ) as Subscriber<any>;
+        },
+      });
 
       if (queue && queue instanceof ReplaySubject) {
         subscription.add((queue as ReplaySubject<T>).subscribe(this.destination));