How to use the azure-iot-device.ConnectionString.createWithX509Certificate function in azure-iot-device

// Workaround for https://github.com/microsoft/vscode-azure-iot-toolkit/issues/331
                        setTimeout(() => {
                            vscode.commands.executeCommand("azure-iot-toolkit.refresh");
                        }, 500);
                    }
                }
                TelemetryClient.sendEvent(eventName, { Result: result }, iotHubConnectionString);
                this.outputLine(label, `[${op}][${result}] status: ${res.statusCode} ${res.statusMessage}`, outputChannel);
            }
            if (deviceInfo) {
                if (deviceInfo.authentication.SymmetricKey.primaryKey != null) {
                    deviceInfo.connectionString = ConnectionString.createWithSharedAccessKey(hostName,
                        deviceInfo.deviceId, deviceInfo.authentication.SymmetricKey.primaryKey);
                }
                if (deviceInfo.authentication.x509Thumbprint.primaryThumbprint != null) {
                    deviceInfo.connectionString = ConnectionString.createWithX509Certificate(hostName, deviceInfo.deviceId);
                }
                this.outputLine(label, `[${op}] device info: ${JSON.stringify(deviceInfo, null, 2)}`, outputChannel);
                resolve(deviceInfo);
            }
            resolve();
        };
    }

deviceList.forEach((device, index) => {
                        let image = device.connectionState.toString() === "Connected" ? "device-on.png" : "device-off.png";
                        let deviceConnectionString = "";
                        if (device.authentication.SymmetricKey.primaryKey != null) {
                            deviceConnectionString = ConnectionString.createWithSharedAccessKey(hostName, device.deviceId,
                                device.authentication.SymmetricKey.primaryKey);
                        } else if (device.authentication.x509Thumbprint.primaryThumbprint != null) {
                            deviceConnectionString = ConnectionString.createWithX509Certificate(hostName, device.deviceId);
                        }
                        devices.push(new DeviceItem(device.deviceId,
                            deviceConnectionString,
                            this.context.asAbsolutePath(path.join("resources", image)),
                            {
                                command: "azure-iot-toolkit.getDevice",
                                title: "",
                                arguments: [device.deviceId],
                            }));
                    });
                    resolve(devices);

deviceList.forEach((device, index) => {
                        let deviceConnectionString: string = "";
                        if (device.authentication.SymmetricKey.primaryKey != null) {
                            deviceConnectionString = DeviceConnectionString.createWithSharedAccessKey(hostName, device.deviceId,
                                device.authentication.SymmetricKey.primaryKey);
                        } else if (device.authentication.x509Thumbprint.primaryThumbprint != null) {
                            deviceConnectionString = DeviceConnectionString.createWithX509Certificate(hostName, device.deviceId);
                        }
                        devices.push(new DeviceItem(device.deviceId,
                            deviceConnectionString,
                            null,
                            device.connectionState.toString(),
                            null));
                    });
                    resolve(devices.sort((a: DeviceItem, b: DeviceItem) => { return a.deviceId.localeCompare(b.deviceId); }));