Failed to extend node.js global with typescript

Question

I am trying to extend the global in node.js, using typescript.

For this, I've created the following structure:

File content of index.d.ts:

import socketio from 'socket.io';

declare namespace NodeJS {
    interface Global {
        sockets: socketio.Socket[];
    }
}

In my tsconfig.json file I provided: "typeRoots": [ "./node_modules/@types", "./@types"]

But I still can't use global.sockets. How to fix it?

Please note that if I would write index.d.ts as:

declare namespace NodeJS {
    interface Global {
        sockets: any[];
    }
}

Then I would be able to access global.sockets

score 3 · Accepted Answer · answered Feb 03 '21 at 14:48

From this stackoverflow question: Ques

Turns out that adding export {} and declare global would do the work.

So the final file would be:

export {};

import socketio from 'socket.io';

declare global {
    declare namespace NodeJS {
        interface Global {
            sockets: socketio.Socket[];
        }
    }
}

Failed to extend node.js global with typescript

1 Answers1