How to satisfy `Server.adapter()` with `typeof Adapter`?

Describe the bug I am not sure if this is just a question or the typings are not correct, but it seems impossible for me to satisfy the Server.adapter() function which is defined as:

adapter(v: typeof Adapter): Server;

I tried:

createAdapter(): Adapter {}
createAdapter(): typeof Adapter {}
createAdapter(): ReturnType<Adapter> {}
createAdapter(): ReturnType<typeof Adapter> {}

Looking at socket.ioredis it just has no return type / returns any 😕

[darrachequesne]

@MickL I think you are right, the typings are not correct.

The adapter argument should be a function that takes a namespace and returns an Adapter instance. Example:

• the in-memory adapter: https://github.com/socketio/socket.io-adapter/blob/2.1.0/lib/index.ts#L30-L33
• the redis adapter: https://github.com/socketio/socket.io-redis/blob/6.0.1/lib/index.ts#L82-L84

[darrachequesne]

This should be fixed by https://github.com/socketio/socket.io/commit/891b1870e92d1ec38910f03bb839817e2d6be65a.

Please reopen if needed.