leaveChat(steamID) {
		let msg = ByteBuffer.allocate(32, ByteBuffer.LITTLE_ENDIAN);
		msg.writeUint64(toChatID(steamID).getSteamID64()); // steamIdChat
		msg.writeUint32(EChatInfoType.StateChange); // type
		msg.writeUint64(this.steamID.getSteamID64());
		msg.writeUint32(EChatMemberStateChange.Left);
		msg.writeUint64(this.steamID.getSteamID64());
		this._send(EMsg.ClientChatMemberInfo, msg.flip());

		steamID = Helpers.steamID(steamID);

		delete this.chats[steamID.getSteamID64()];
	}
Leave a chat room.
@param {(SteamID|string)} steamID - The SteamID of the chat room to leave (as a SteamID object or a string which can parse into one)
@deprecated This uses the old-style chat rooms, if you want new chat instead use this.chat