1 files changed, 37 insertions, 0 deletions
diff --git a/node_modules/rxjs/src/internal/BehaviorSubject.ts b/node_modules/rxjs/src/internal/BehaviorSubject.ts
new file mode 100644
index 0000000..6540f13
--- /dev/null
+++ b/node_modules/rxjs/src/internal/BehaviorSubject.ts
@@ -0,0 +1,37 @@
+import { Subject } from './Subject';
+import { Subscriber } from './Subscriber';
+import { Subscription } from './Subscription';
+
+/**
+ * A variant of Subject that requires an initial value and emits its current
+ * value whenever it is subscribed to.
+ */
+export class BehaviorSubject<T> extends Subject<T> {
+  constructor(private _value: T) {
+    super();
+  }
+
+  get value(): T {
+    return this.getValue();
+  }
+
+  /** @internal */
+  protected _subscribe(subscriber: Subscriber<T>): Subscription {
+    const subscription = super._subscribe(subscriber);
+    !subscription.closed && subscriber.next(this._value);
+    return subscription;
+  }
+
+  getValue(): T {
+    const { hasError, thrownError, _value } = this;
+    if (hasError) {
+      throw thrownError;
+    }
+    this._throwIfClosed();
+    return _value;
+  }
+
+  next(value: T): void {
+    super.next((this._value = value));
+  }
+}