Extending a module in a TypeScript definition file

After examining this definition file, it seems that extending the exported Request interface is not possible due to the namespace not being exported. If anyone has any insights or suggestions on how to achieve this, I would greatly appreciate it :)

I made an attempt in my index.d.ts, but unfortunately, it did not work:

declare module 'koa' {
    namespace Koa {
        export interface Request {
            body: string;
        }
    }
}

Many thanks, Robin

Answer №1

If you want to extend it, you simply need to update the entire module declaration.

Modified koa.d.ts file:

declare module 'koa' {
    namespace Koa {
        export interface Request {
            body: string;
        }
    }
}

Updated someOtherFile.d.ts file:

declare module 'koa' {
    namespace Koa {
        export interface Request {
            head: string;
        }
    }
}

Example in useIt.ts:

import {Koa} from 'koa';

let x : Koa.Request;

x.head;  // This will work without any issues

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