interface dom.RTCDTMFToneChangeEvent implements Eventimport { type dom } from "https://deno.land/x/evt@v2.4.17/mod.ts"; const { RTCDTMFToneChangeEvent } = dom; Events sent to indicate that DTMF tones have started or finished playing. This interface is used by the tonechange event. Propertiesreadonlytone: string