Add web front-end and fix API issues

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

@@ -0,0 +1,9 @@
+import { AsyncSubject } from '../AsyncSubject';
+import { ConnectableObservable } from '../observable/ConnectableObservable';
+export function publishLast() {
+    return (source) => {
+        const subject = new AsyncSubject();
+        return new ConnectableObservable(source, () => subject);
+    };
+}
+//# sourceMappingURL=publishLast.js.map