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node_modules/rxjs/src/internal/observable/connectable.ts

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+import { Connectable, ObservableInput, SubjectLike } from '../types';
+import { Subject } from '../Subject';
+import { Subscription } from '../Subscription';
+import { Observable } from '../Observable';
+import { defer } from './defer';
+
+export interface ConnectableConfig<T> {
+  /**
+   * A factory function used to create the Subject through which the source
+   * is multicast. By default this creates a {@link Subject}.
+   */
+  connector: () => SubjectLike<T>;
+  /**
+   * If true, the resulting observable will reset internal state upon disconnection
+   * and return to a "cold" state. This allows the resulting observable to be
+   * reconnected.
+   * If false, upon disconnection, the connecting subject will remain the
+   * connecting subject, meaning the resulting observable will not go "cold" again,
+   * and subsequent repeats or resubscriptions will resubscribe to that same subject.
+   */
+  resetOnDisconnect?: boolean;
+}
+
+/**
+ * The default configuration for `connectable`.
+ */
+const DEFAULT_CONFIG: ConnectableConfig<unknown> = {
+  connector: () => new Subject<unknown>(),
+  resetOnDisconnect: true,
+};
+
+/**
+ * Creates an observable that multicasts once `connect()` is called on it.
+ *
+ * @param source The observable source to make connectable.
+ * @param config The configuration object for `connectable`.
+ * @returns A "connectable" observable, that has a `connect()` method, that you must call to
+ * connect the source to all consumers through the subject provided as the connector.
+ */
+export function connectable<T>(source: ObservableInput<T>, config: ConnectableConfig<T> = DEFAULT_CONFIG): Connectable<T> {
+  // The subscription representing the connection.
+  let connection: Subscription | null = null;
+  const { connector, resetOnDisconnect = true } = config;
+  let subject = connector();
+
+  const result: any = new Observable<T>((subscriber) => {
+    return subject.subscribe(subscriber);
+  });
+
+  // Define the `connect` function. This is what users must call
+  // in order to "connect" the source to the subject that is
+  // multicasting it.
+  result.connect = () => {
+    if (!connection || connection.closed) {
+      connection = defer(() => source).subscribe(subject);
+      if (resetOnDisconnect) {
+        connection.add(() => (subject = connector()));
+      }
+    }
+    return connection;
+  };
+
+  return result;
+}