Add web front-end and fix API issues

node_modules/rxjs/dist/esm/internal/operators/finalize.js

@@ -0,0 +1,12 @@
+import { operate } from '../util/lift';
+export function finalize(callback) {
+    return operate((source, subscriber) => {
+        try {
+            source.subscribe(subscriber);
+        }
+        finally {
+            subscriber.add(callback);
+        }
+    });
+}
+//# sourceMappingURL=finalize.js.map