Add web front-end and fix API issues

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

@@ -0,0 +1,7 @@
+import { asyncScheduler } from '../scheduler/async';
+import { sample } from './sample';
+import { interval } from '../observable/interval';
+export function sampleTime(period, scheduler = asyncScheduler) {
+    return sample(interval(period, scheduler));
+}
+//# sourceMappingURL=sampleTime.js.map