Add web front-end and fix API issues

node_modules/rxjs/dist/cjs/internal/scheduler/performanceTimestampProvider.js

@@ -0,0 +1,10 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.performanceTimestampProvider = void 0;
+exports.performanceTimestampProvider = {
+    now: function () {
+        return (exports.performanceTimestampProvider.delegate || performance).now();
+    },
+    delegate: undefined,
+};
+//# sourceMappingURL=performanceTimestampProvider.js.map