Add web front-end and fix API issues

node_modules/rxjs/dist/esm/internal/util/mapOneOrManyArgs.js

@@ -0,0 +1,9 @@
+import { map } from "../operators/map";
+const { isArray } = Array;
+function callOrApply(fn, args) {
+    return isArray(args) ? fn(...args) : fn(args);
+}
+export function mapOneOrManyArgs(fn) {
+    return map(args => callOrApply(fn, args));
+}
+//# sourceMappingURL=mapOneOrManyArgs.js.map