initial commit: scaffolding

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diff --git a/node_modules/rxjs/src/internal/operators/windowToggle.ts b/node_modules/rxjs/src/internal/operators/windowToggle.ts
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+import { Observable } from '../Observable';
+import { Subject } from '../Subject';
+import { Subscription } from '../Subscription';
+import { ObservableInput, OperatorFunction } from '../types';
+import { operate } from '../util/lift';
+import { innerFrom } from '../observable/innerFrom';
+import { createOperatorSubscriber } from './OperatorSubscriber';
+import { noop } from '../util/noop';
+import { arrRemove } from '../util/arrRemove';
+
+/**
+ * Branch out the source Observable values as a nested Observable starting from
+ * an emission from `openings` and ending when the output of `closingSelector`
+ * emits.
+ *
+ * <span class="informal">It's like {@link bufferToggle}, but emits a nested
+ * Observable instead of an array.</span>
+ *
+ * ![](windowToggle.png)
+ *
+ * Returns an Observable that emits windows of items it collects from the source
+ * Observable. The output Observable emits windows that contain those items
+ * emitted by the source Observable between the time when the `openings`
+ * Observable emits an item and when the Observable returned by
+ * `closingSelector` emits an item.
+ *
+ * ## Example
+ *
+ * Every other second, emit the click events from the next 500ms
+ *
+ * ```ts
+ * import { fromEvent, interval, windowToggle, EMPTY, mergeAll } from 'rxjs';
+ *
+ * const clicks = fromEvent(document, 'click');
+ * const openings = interval(1000);
+ * const result = clicks.pipe(
+ *   windowToggle(openings, i => i % 2 ? interval(500) : EMPTY),
+ *   mergeAll()
+ * );
+ * result.subscribe(x => console.log(x));
+ * ```
+ *
+ * @see {@link window}
+ * @see {@link windowCount}
+ * @see {@link windowTime}
+ * @see {@link windowWhen}
+ * @see {@link bufferToggle}
+ *
+ * @param openings An observable of notifications to start new windows.
+ * @param closingSelector A function that takes the value emitted by the
+ * `openings` observable and returns an Observable, which, when it emits a next
+ * notification, signals that the associated window should complete.
+ * @return A function that returns an Observable of windows, which in turn are
+ * Observables.
+ */
+export function windowToggle<T, O>(
+  openings: ObservableInput<O>,
+  closingSelector: (openValue: O) => ObservableInput<any>
+): OperatorFunction<T, Observable<T>> {
+  return operate((source, subscriber) => {
+    const windows: Subject<T>[] = [];
+
+    const handleError = (err: any) => {
+      while (0 < windows.length) {
+        windows.shift()!.error(err);
+      }
+      subscriber.error(err);
+    };
+
+    innerFrom(openings).subscribe(
+      createOperatorSubscriber(
+        subscriber,
+        (openValue) => {
+          const window = new Subject<T>();
+          windows.push(window);
+          const closingSubscription = new Subscription();
+          const closeWindow = () => {
+            arrRemove(windows, window);
+            window.complete();
+            closingSubscription.unsubscribe();
+          };
+
+          let closingNotifier: Observable<any>;
+          try {
+            closingNotifier = innerFrom(closingSelector(openValue));
+          } catch (err) {
+            handleError(err);
+            return;
+          }
+
+          subscriber.next(window.asObservable());
+
+          closingSubscription.add(closingNotifier.subscribe(createOperatorSubscriber(subscriber, closeWindow, noop, handleError)));
+        },
+        noop
+      )
+    );
+
+    // Subscribe to the source to get things started.
+    source.subscribe(
+      createOperatorSubscriber(
+        subscriber,
+        (value: T) => {
+          // Copy the windows array before we emit to
+          // make sure we don't have issues with reentrant code.
+          const windowsCopy = windows.slice();
+          for (const window of windowsCopy) {
+            window.next(value);
+          }
+        },
+        () => {
+          // Complete all of our windows before we complete.
+          while (0 < windows.length) {
+            windows.shift()!.complete();
+          }
+          subscriber.complete();
+        },
+        handleError,
+        () => {
+          // Add this finalization so that all window subjects are
+          // disposed of. This way, if a user tries to subscribe
+          // to a window *after* the outer subscription has been unsubscribed,
+          // they will get an error, instead of waiting forever to
+          // see if a value arrives.
+          while (0 < windows.length) {
+            windows.shift()!.unsubscribe();
+          }
+        }
+      )
+    );
+  });
+}