Upgrade Socket.IO to v4 - #167
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Update the client and server Socket.IO packages together and replace socket.io-redis with the maintained Redis adapter using explicit ioredis pub/sub clients. Keep the full-stack Cypress lobby assertions stable when the local room list overflows.
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Summary
Why
Socket.IO 3 pulls older engine.io/ws runtime dependencies with known DoS advisories. Socket.IO 4 moves the runtime socket path to patched ws 8.21.0 while keeping the existing app protocol behavior covered by Cypress.
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