update

node_modules/rxjs/src/AsyncSubject.ts

@@ -0,0 +1,45 @@
+import { Subject } from './Subject';
+import { Subscriber } from './Subscriber';
+import { Subscription } from './Subscription';
+
+/**
+ * @class AsyncSubject<T>
+ */
+export class AsyncSubject<T> extends Subject<T> {
+  private value: T = null;
+  private hasNext: boolean = false;
+  private hasCompleted: boolean = false;
+
+  /** @deprecated internal use only */ _subscribe(subscriber: Subscriber<any>): Subscription {
+    if (this.hasError) {
+      subscriber.error(this.thrownError);
+      return Subscription.EMPTY;
+    } else if (this.hasCompleted && this.hasNext) {
+      subscriber.next(this.value);
+      subscriber.complete();
+      return Subscription.EMPTY;
+    }
+    return super._subscribe(subscriber);
+  }
+
+  next(value: T): void {
+    if (!this.hasCompleted) {
+      this.value = value;
+      this.hasNext = true;
+    }
+  }
+
+  error(error: any): void {
+    if (!this.hasCompleted) {
+      super.error(error);
+    }
+  }
+
+  complete(): void {
+    this.hasCompleted = true;
+    if (this.hasNext) {
+      super.next(this.value);
+    }
+    super.complete();
+  }
+}