Add web front-end and fix API issues

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

@@ -0,0 +1,8 @@
+import { asyncScheduler } from '../scheduler/async';
+import { delayWhen } from './delayWhen';
+import { timer } from '../observable/timer';
+export function delay(due, scheduler = asyncScheduler) {
+    const duration = timer(due, scheduler);
+    return delayWhen(() => duration);
+}
+//# sourceMappingURL=delay.js.map