crud test controller and class validator mocker generate classes

server/src/core/extensions/array.ts

@@ -1,5 +1,10 @@
 /* eslint-disable @typescript-eslint/no-this-alias */
 export const ArrayExtensions = () => {
+  if ([].firstElement === undefined) {
+    Array.prototype.firstElement = function () {
+      return this[0];
+    };
+  }
   if ([].equals === undefined) {
     // eslint-disable-next-line no-extend-native
     Array.prototype.equals = function (array, strict = true) {