Add web front-end and fix API issues

node_modules/rxjs/dist/cjs/internal/util/isInteropObservable.js

@@ -0,0 +1,10 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.isInteropObservable = void 0;
+var observable_1 = require("../symbol/observable");
+var isFunction_1 = require("./isFunction");
+function isInteropObservable(input) {
+    return isFunction_1.isFunction(input[observable_1.observable]);
+}
+exports.isInteropObservable = isInteropObservable;
+//# sourceMappingURL=isInteropObservable.js.map