Add web front-end and fix API issues

node_modules/rxjs/dist/cjs/internal/testing/SubscriptionLog.js

@@ -0,0 +1,13 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.SubscriptionLog = void 0;
+var SubscriptionLog = (function () {
+    function SubscriptionLog(subscribedFrame, unsubscribedFrame) {
+        if (unsubscribedFrame === void 0) { unsubscribedFrame = Infinity; }
+        this.subscribedFrame = subscribedFrame;
+        this.unsubscribedFrame = unsubscribedFrame;
+    }
+    return SubscriptionLog;
+}());
+exports.SubscriptionLog = SubscriptionLog;
+//# sourceMappingURL=SubscriptionLog.js.map