Decalaration file update required for append method

[Seyfor]

I think that declaration file (kendo.all.d.ts) is missing declaration, where second parameter for append method is not required (based on this example).

append(item: any): kendo.ui.Menu;  //currently missing
append(item: any, referenceItem: string): kendo.ui.Menu;
append(item: any, referenceItem: JQuery): kendo.ui.Menu;

I think that this is the way, how can I add menu item if there are no items yet in the menu?

[T. Tsonev]

Hello,

Thanks for the heads-up. I've updated the definitions and marked the second parameter as optional.

The fix will be included in the next release.

Regards,
T. Tsonev
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