Extending an existing interface within a globally declared namespace in Typescript

My current challenge involves extending an existing interface within KendoUI that originates from a specific definition file. Typically, using interface merging makes this task simple, but the interface I want to extend exists in the unique global namespace "kendo.ui".

I am attempting to include the "hideInEditor" property to the kendo.ui.GridColumn interface as follows.

namespace kendo.ui {
    export interface GridColumn {
        hideInEditor?: boolean;
    }   
}

However, it appears that the compiler has overlooked the original definitions, resulting in the inability to access the kendo namespace and all corresponding types have gone missing. It seems my approach is incorrect. What would be the correct method to extend such an interface?

typescriptkendo-ui

Answer №1

If you have the type definition files in the same directory, they won't have any impact unless you specifically instruct the compiler to locate them.

For your situation, it looks like you require the following setup:

/// <reference path="./kendo.ui.d.ts" />

namespace kendo.ui {
    export interface GridColumn {
        hideInEditor?: boolean;
    }
}

let obj: kendo.ui.GridColumn;
console.log(kendo.culture()); // works fine
console.log(obj.format); // works fine
console.log(obj.hideInEditor); // works fine

Pay attention to including the reference line at the start.

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