Add web front-end and fix API issues

node_modules/rxjs/dist/cjs/internal/observable/never.js

@@ -0,0 +1,11 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.never = exports.NEVER = void 0;
+var Observable_1 = require("../Observable");
+var noop_1 = require("../util/noop");
+exports.NEVER = new Observable_1.Observable(noop_1.noop);
+function never() {
+    return exports.NEVER;
+}
+exports.never = never;
+//# sourceMappingURL=never.js.map