Readonly type
type: "wait-for-duration" | "wait-for-rtc-data-channel" | "wait-for-rtc-track" | "wait-for-rtc-media" | "wait-for-rtc-message" | "create-rtc-data-channel" | "send-rtc-data-message" | "close-rtc-connection" | "echo-rtc" | "rtc-peer-proxy" | "rtc-dynamic-proxy"