generic function call in typescript throws error

Question

I have certain code that looks like this

interface KnockoutObservableArrayStatic {
    fn: KnockoutObservableArrayFunctions<any>;
    <T>(value?: T[]): KnockoutObservableArray<T>;
}
declare var ko: KnockoutObservableArrayStatic;

I want to create a empty observable array with type TElement, which should be something like this

var elementArray: TElement[] = null;
var observableArray = ko(elementArray);

But compiler gives me error

Cannot convert 'KnockoutObservableArray' to 'KnockoutObservableArray': Call signatures of types 'KnockoutObservableArray' and 'KnockoutObservableArray' are incompatible

How come?

Ryan Cavanaugh · Accepted Answer · 2013-10-14 16:56:32Z

3

Hard to say without seeing all of the code, but this sounds like a compiler bug (you shouldn't see "Cannot convert T to T" errors ever, basically). If you could post an issue with a self-contained example I can verify if the code compiles with the latest TypeScript compiler. There have been several bugs around generic compatibility with the Knockout type structure like this.

answered Oct 14, 2013 at 16:56

Ryan Cavanaugh

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Comments

onets · Accepted Answer · 2014-07-11 08:27:11Z

0

I had the same problem when compiled solution in VS2013.

I deleted this two lines from MyProject.csproj file

<Import Project="$(MSBuildExtensionsPath32)\Microsoft\VisualStudio\v$(VisualStudioVersion)\TypeScript\Microsoft.TypeScript.targets" Condition="Exists('$(MSBuildExtensionsPath32)\Microsoft\VisualStudio\v$(VisualStudioVersion)\TypeScript\Microsoft.TypeScript.targets')" />

<Import Project="$(MSBuildExtensionsPath32)\Microsoft\VisualStudio\v$(VisualStudioVersion)\TypeScript\Microsoft.TypeScript.Default.props" Condition="Exists('$(MSBuildExtensionsPath32)\Microsoft\VisualStudio\v$(VisualStudioVersion)\TypeScript\Microsoft.TypeScript.Default.props')" />

and errors went out.

edited Jul 11, 2014 at 8:27

answered Jul 10, 2014 at 10:21

onets

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