I am trying to enhance the JQueryStatic interface by adding a new property called someString, which I intend to access using $.someString.
Within my index.ts file, I have defined the following code:
interface JQueryStatic {
someString: string;
}
$.someString = "string";
The variable $ is of type JQueryStatic, but despite this, I encounter the following error message:
Property 'someString' does not exist on type 'JQueryStatic'.
If you want to extend the jQuery type declarations, you can create an ambient type declaration like this:
declare interface JQueryStatic {
someString: string;
}
Add this code to a .d.ts file within your project and ensure that it is included (or not excluded) in your tsconfig.json file.
What makes this work?
The use of "declare" makes this declaration "ambient" - indicating that there exists a JQueryStatic with a member called someString somewhere. TypeScript recognizes this and merges it with any other existing JQueryStatic declarations, such as the ones from jQuery typings, into a single JQueryStatic interface declaration.
To incorporate your new interface declaration for the $ variable with the existing type information, you can create a separate file named jquery-extensions.d.ts:
interface JQueryStatic {
customProperty: string;
}
If needed, include a reference path to this new file at the beginning of your code:
/// <reference path="../path/to/jquery-extensions.d.ts" />
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