Variable: SERVER_ERROR_CODES

const SERVER_ERROR_CODES: readonly ["unauthenticated", "token_expired", "token_replayed", "permission_denied", "app_suspended", "room_not_found", "room_full", "room_closed", "duplicate_identity", "identity_not_found", "invite_expired", "already_answered", "no_agents_available", "quota_exhausted", "insufficient_credit", "sfu_unavailable", "rate_limited", "payload_too_large", "protocol_error", "auth_timeout", "session_expired", "slow_consumer", "unsupported_message", "client_outdated", "conflict", "internal"];

Every code the server can put in Error.code, verbatim.