Add web front-end and fix API issues

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

@@ -0,0 +1,6 @@
+import { dateTimestampProvider } from '../scheduler/dateTimestampProvider';
+import { map } from './map';
+export function timestamp(timestampProvider = dateTimestampProvider) {
+    return map((value) => ({ value, timestamp: timestampProvider.now() }));
+}
+//# sourceMappingURL=timestamp.js.map