Add web front-end and fix API issues

node_modules/rxjs/dist/cjs/internal/operators/count.js

@@ -0,0 +1,9 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.count = void 0;
+var reduce_1 = require("./reduce");
+function count(predicate) {
+    return reduce_1.reduce(function (total, value, i) { return (!predicate || predicate(value, i) ? total + 1 : total); }, 0);
+}
+exports.count = count;
+//# sourceMappingURL=count.js.map