setGroupUserBanState(groupId, userSteamId, banState, callback) {
		return StdLib.Promises.timeoutCallbackPromise(10000, null, callback, true, (resolve, reject) => {
			this.user._sendUnified('ChatRoom.SetUserBanState#1', {
				chat_group_id: groupId,
				steamid: Helpers.steamID(userSteamId).toString(),
				ban_state: banState
			}, (body, hdr) => {
				let err = Helpers.eresultError(hdr.proto);
				if (err) {
					return reject(err);
				}

				// No data in the response
				resolve();
			});
		});
	}
Ban or unban a user from a chat room group, provided you have the appropriate permissions.
@param {int|string} groupId
@param {string|SteamID} userSteamId
@param {boolean} banState - True to ban, false to unban
@param {function} [callback]
@returns {Promise}