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Request a Feature Report a Bug
Completed
Last Updated: 02 Oct 2026 11:48 by ADMIN
Release 2026 Q4
Khengaik
Created on: 18 Aug 2026 10:01
Category: UI for ASP.NET Core
Type: Bug Report
1
TypeScript errors with version 2026.3.811

Using the latest 2026.3.811 version produces the following errors:

  • kendo.all.d.ts(12072,26): error TS2552: Build:Cannot find name 'SchedulerKendoKeydownEvent'. Did you mean 'SliderKendoKeydownEvent'?
  • kendo.all.d.ts(14372,9): error TS2416: Build:Property 'options' in type 'ToggleButton' is not assignable to the same property in base type 'Button'.
  • kendo.all.d.ts(14384,15): error TS2430: Build:Interface 'ToggleButtonOptions' incorrectly extends interface 'ButtonOptions'.

 

3 comments
ADMIN
Neli
Posted on: 02 Oct 2026 11:48

Hello Paul,

Your fix is correct: updating or removing the reference to SchedulerKendoKeydownEvent resolves the TS2552 error.

To resolve the ToggleButton and ToggleButtonOptions errors in the type definitions you can manually edit the kendo.all.d.ts file:

Replace the following:
interface ToggleButtonKendoKeydownEvent {
        sender: ToggleButton;
        preventDefault: Function;
        preventKendoKeydown: boolean;
    }
With:
interface ToggleButtonKendoKeydownEvent extends ButtonKendoKeydownEvent {
        sender: ToggleButton;
}
I hope this helps. 


    Regards,
    Neli
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    Paul
    Posted on: 26 Sep 2026 13:11

    OK, the first error can be fixed by correcting the SchedulerKendoKeydownEvent reference:

    kendoKeydown?(e: kendo.data.SchedulerKendoKeydownEvent): void;
    Paul
    Posted on: 26 Sep 2026 13:02
    What are we supposed to do while waiting for Q4 release? Is there an updated definition file available NOW, or instructions on how to edit the broken file?
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