Add web front-end and fix API issues

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

@@ -0,0 +1,10 @@
+import { concat } from '../observable/concat';
+import { popScheduler } from '../util/args';
+import { operate } from '../util/lift';
+export function startWith(...values) {
+    const scheduler = popScheduler(values);
+    return operate((source, subscriber) => {
+        (scheduler ? concat(values, source, scheduler) : concat(values, source)).subscribe(subscriber);
+    });
+}
+//# sourceMappingURL=startWith.js.map