condition fixed

ui/src/core/extensions/extensions.ts

@@ -29,6 +29,7 @@ declare global {
     replacePropIndex(property: Partial<T>, index: number): T[];
     someR(predicate: (value: T) => boolean): Result<void, Array<T>>;
     updateAll(value: Partial<T>): Array<T>;
+    atR(index: number): Result<void, T>;
   }
   interface Date {
     formatDate(): string;