added scene manager

ui/src/core/extensions/extensions.ts

@@ -16,6 +16,7 @@ declare global {
   }
   interface String {
     isEmpty(): boolean;
+    isNotEmpty(): boolean;
   }
   interface Map<K, V> {
     addValueOrMakeCallback(key: K, value: V, callBack: CallBackVoidFunction): void;

ui/src/core/extensions/string.ts

@@ -5,4 +5,10 @@ export const StringExtensions = () => {
       return this.length === 0;
     };
   }
+  if ("".isNotEmpty === undefined) {
+    // eslint-disable-next-line no-extend-native
+    String.prototype.isNotEmpty = function () {
+      return this.length !== 0;
+    };
+  }
 };