Extend interface defined in .d.ts file

Question

In my TypeScript project, I use DefinitelyTyped definitions for external js dependencies.

Sometimes it might happen that these definitions are outdated. It might als

Answer 1

I was able to accomplish this by following the directions at https://www.credera.com/blog/technology-solutions/typescript-adding-custom-type-definitions-for-existing-libraries/. There they use the example of react.

import 'react';
 
declare module 'react' {
    interface OlHTMLAttributes {
        type?: "1" | "a" | "A" | "i" | "I";
    }
}

I found this works really well for winston too.