TypeError on socket.io adapter

Question

For using multiple nodes in my socket.io as part of expanding I used the Redis socket.io adapter @socket.io/redis-adapter. The transmission of data/messages between sockets on different nodes works fine on the cluster mode. When trying to fetch the rooms list by using the below command io.of("/").adapter.rooms. I got a type error with the following message

TypeError Cannot read properties of undefined (reading 'of') TypeError: Cannot read properties of undefined (reading 'of')

But I got the data

Map(2) { 'j6tCnsyjjzFBpbNuAAAB' => Set(1) { 'j6tCnsyjjzFBpbNuAAAB' }, 'books' => Set(1) { 'j6tCnsyjjzFBpbNuAAAB' } }

I was confused as am getting the room data but this type error continues.

The response for printing io console.log(io)

console.log(io)