Per-transport runtime state. Built once per addSyncTransport rather than at module scope on purpose: several transports (each with its own isServerFn) coexist in one process in the tests, and they must not share a role.
addSyncTransport
isServerFn
Per-transport runtime state. Built once per
addSyncTransportrather than at module scope on purpose: several transports (each with its ownisServerFn) coexist in one process in the tests, and they must not share a role.