Add web front-end and fix API issues

node_modules/rxjs/dist/cjs/internal/observable/empty.js

@@ -0,0 +1,13 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.empty = exports.EMPTY = void 0;
+var Observable_1 = require("../Observable");
+exports.EMPTY = new Observable_1.Observable(function (subscriber) { return subscriber.complete(); });
+function empty(scheduler) {
+    return scheduler ? emptyScheduled(scheduler) : exports.EMPTY;
+}
+exports.empty = empty;
+function emptyScheduled(scheduler) {
+    return new Observable_1.Observable(function (subscriber) { return scheduler.schedule(function () { return subscriber.complete(); }); });
+}
+//# sourceMappingURL=empty.js.map