diff --git a/packages/core/src/builder.class.ts b/packages/core/src/builder.class.ts
index 7de6d2252fe..6e40599c996 100644
--- a/packages/core/src/builder.class.ts
+++ b/packages/core/src/builder.class.ts
@@ -641,10 +641,12 @@ export interface Input {
    */
   advanced?: boolean;
   /** @hidden */
-  onChange?: (
-    options: any,
-    previousOptions?: any
-  ) => Promise<void> | ((options: any, previousOptions?: any) => void) | string | void | undefined;
+  onChange?:
+    | ((options: any, previousOptions?: any) => Promise<void>)
+    | ((options: any, previousOptions?: any) => void)
+    | string
+    | void
+    | undefined;
   /** @hidden */
   code?: boolean;
   /** @hidden */