Argument type {transport: {read: (function(any): undefined)}} is not assignable to parameter type DataSourceOptions

[Mike]

I'm currently using Typescript and the latest kendo type definition (and WebStorm as my IDE).

I am using the DataSource as illustrated in the second example of the Read section at this link: 

    http://docs.telerik.com/kendo-ui/framework/datasource/crud

where read is set to be a function.

Everything compiles fine and works BUT my editor is not able to resolve this overloaded version based on the kendo ui type definition. 

 How can I get an updated version of the definition that contains this overload OR how can I resolve this issue?

I've attached a screenshot demonstrating the error.

  

 

 

 

 

[Kiril Nikolov]

Hello Mike,

 

I have just tested this with the latest typescript definitions and it worked correctly. Please make sure that you are using the latest definitions in your project.

Regards,
Kiril Nikolov
Telerik

 

 

[Mike]

Did you test it with assigning a function or with the DataSourceTransportRead object? I'm using the d.ts that came with the version of kendo I am using (Q3 2015) and I don't see where the d.ts defines read to accept a function. It seems to only accept a DataSourceTransportRead object.

[Kiril Nikolov]

Hello Mike,

 

I have tested that as well. I am using the 2015.3.1214 version. Can you please download it from your account and try it?

 

Regards,
Kiril Nikolov
Telerik

 

 

[Mike]

I am now upgraded my project to use Q1 2016 of Kendo UI and I am still getting the issue. Find attached screenshots of following the the object chain.

The screenshots are named numerically and should be viewed in numeric order.

Assigning a function to Read as I am doing in the first screenshot above works and transpiles BUT I receive an error from my IDE (WebStorm) as can be seen in screenshot #1. WebStorm however appears to be correct that ‘read’ doesn’t evaluate to a function but rather an object that extends JQueryAjaxSettings. How can I make the error go away?

[Kiril Nikolov]

Hi Mike,

I am not sure what is causing this error in your IDE as I am not able to reproduce it inside Visual Studio (I do not have WebStorm available here). Can you reproduce the same error in a VS solution or other IDE?

Regards,
Kiril Nikolov
Telerik

 

 

[Mike]

I've shown the logic to trace through the definitions and I think WebStorm is correct. The Telerik documentation says the read of DataSourceTransport may be a object, function or string (see attached pic). The kendo type definition says object only (DataSourceTransportRead). When I change the defintion of 'read' to be 'read?: DataSourceTransportRead|Function|string' the error goes away. I think Telerik should update their type definition file. Or please tell me why they shouldn't?

[Kiril Nikolov]

Hi Mike,

The problem is that I cannot reproduce the same issue locally and therefore see what is causing the issue, as the documentation is correct the read supports a function as well as object or a string. When I use your configuration locally I do not get the same error.

We will further investigate the issue and if something comes up - or you send us a sample where we can reproduce the issue - it will really help.

Regards,
Kiril Nikolov
Telerik

 

 

[Mike]

Yes the Telerik documentation appears to be accurate BUT the typescript definition is not. If you actually look at my screenshot #4 you can see the read property is expected to be of type DataSourceTransportRead which is an object and is not a function or string as the documentation says it can be. The solution as I have mentioned is to change this property to be a union type of DataSourceTransportRead and Function and string. Why is this so confusing?

[Kiril Nikolov]

Hello Mike,

I am not able to reproduce the problem locally, please see the attached screenshot showing the working code. I believe it is an issue with your editor and its settings.

Regards,
Kiril Nikolov
Telerik