How to use the node-opcua-client.AttributeIds.DataType function in node-opcua-client

const client = OPCUAClient.create(options);

    console.log(" about to connect");
    await client.connect("opc.tcp://" + os.hostname() + ":48010");
    console.log("connected");

    client.on("backoff", () => {
        console.log("Backoff");
    });

    const session = await client.createSession();

    const variableNodeID = "ns=2;s=Demo.WorkOrder.WorkOrderVariable";

    const dataValueDataType = await session.read({ nodeId: variableNodeID, attributeId: AttributeIds.DataType });
    console.log(" DataType =", dataValueDataType.value.value.toString());
    const dataTypeNodeId = dataValueDataType.value.value as NodeId;

    const extraDataTypeManager = await session.extractNamespaceDataType();

    await getDataTypeDefinition(session, dataTypeNodeId, extraDataTypeManager);

    const dataValueDataTypeBrowseName = await session.read({
        attributeId: AttributeIds.BrowseName,
        nodeId: dataValueDataType.value.value
    });
    console.log(" DataType BrowseName", dataValueDataTypeBrowseName.value.value.toString());

    const dataValue = await session.read({ nodeId: variableNodeID, attributeId: AttributeIds.Value });
    console.log(dataValue.toString());

function toString1(attribute: AttributeIds, dataValue: DataValue | null) {

    if (!dataValue || !dataValue.value || !dataValue.value.hasOwnProperty("value")) {
        return "";
    }
    switch (attribute) {
        case AttributeIds.DataType:
            return DataTypeIdsToString[dataValue.value.value.value] + " (" + dataValue.value.value.toString() + ")";
        case AttributeIds.NodeClass:
            return NodeClass[dataValue.value.value] + " (" + dataValue.value.value + ")";
        case AttributeIds.IsAbstract:
        case AttributeIds.Historizing:
        case AttributeIds.EventNotifier:
            return dataValue.value.value ? "true" : "false"
        case AttributeIds.WriteMask:
        case AttributeIds.UserWriteMask:
            return " (" + dataValue.value.value + ")";
        case AttributeIds.NodeId:
        case AttributeIds.BrowseName:
        case AttributeIds.DisplayName:
        case AttributeIds.Description:
        case AttributeIds.ValueRank:
        case AttributeIds.ArrayDimensions: