The adapter to use for handling rooms. NOTE: this should be a class, not an object
Whether to allow transport upgrades (engine.io)
Name of the HTTP cookie that contains the client sid to send as part of handshake response headers. Set to false to not send one (engine.io)
Whether to let engine.io handle the OPTIONS requests. You can also pass a custom function to handle the requests
Parameters of the http compression for the polling transports (see zlib). Set to false to disable, or set an object with parameter "threshold:number" to only compress data if the byte size is above this value (1024) (engine.io)
How many bytes or characters a message can be when polling, before closing the session (to avoid Dos) (engine.io)
The name of a namespace
Accepted origins
The path to ws
parameters of the WebSocket permessage-deflate extension (see ws module). Set to false to disable (engine.io)
How many milliseconds before sending a new ping packet (keep-alive) (engine.io)
How many milliseconds without a pong packed to consider the connection closed (engine.io)
Should we serve the client file?
Transports to allow connections to (engine.io)
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https://github.com/DefinitelyTyped/DefinitelyTyped/blob/master/types/socket.io/index.d.ts