How to use the node-opcua-factory.getConstructor function in node-opcua-factory

const namespaceUri = addressSpace.getNamespaceUri(dataType.nodeId.namespace);

    // istanbul ignore next
    if (!dataType.binaryEncodingNodeId) {
        throw new Error(
            "DataType with name " +
                dataType.browseName.toString() +
                " has no binaryEncoding node\nplease check your nodeset file"
        );
    }

    // if binaryEncodingNodeId is in the standard factory => no need to overwrite

    if (!bForce && (hasConstructor(dataType.binaryEncodingNodeId) || dataType.binaryEncodingNodeId.namespace === 0)) {
        //xx console.log(chalk.bgYellow("Skipping standard constructor") ," for dataType" ,dataType.browseName.toString());
        return getConstructor(dataType.binaryEncodingNodeId);
    }

    const schema = constructSchema(addressSpace, dataType);

    generateFileCode(namespaceUri, schema, schema_folder);

    generateStructureCode(namespaceUri, schema);

    const filename = getSchemaSourceFile(namespaceUri, schema.name, "");

    const relative_filename = normalize_require_file(__dirname, filename);

    const constructor = require(relative_filename)[schema.name];
    assert(_.isFunction(constructor), "expecting a constructor here");

    return constructor;

assert(dataType instanceof UADataType);

    const addressSpace = dataType.addressSpace;
    assert(addressSpace.constructor.name === "AddressSpace");
    assert(addressSpace instanceof AddressSpace);

    // istanbul ignore next
    if (!dataType.binaryEncodingNodeId) {
        throw new Error("DataType with name " + dataType.browseName.toString() + " has no binaryEncoding node\nplease check your nodeset file");
    }

    // if binaryEncodingNodeId is in the standard factory => no need to overwrite
    if (!bForce && (hasConstructor(dataType.binaryEncodingNodeId) ||   dataType.binaryEncodingNodeId.namespace === 0)) {
        //xx console.log("Skipping standard constructor".bgYellow ," for dataType" ,dataType.browseName.toString());
        return getConstructor(dataType.binaryEncodingNodeId);
    }
    // etc ..... please fix me
    const namespaceUri = addressSpace.getNamespaceUri(dataType.nodeId.namespace);
    return buildConstructorFromDefinition(addressSpace,dataType);
}