How to use the node-opcua-service-browse.BrowseDirection.Forward function in node-opcua-service-browse

export async function exploreDataTypeDefinition(
    session: IBasicSession,
    dataTypeDictionaryTypeNode: NodeId,
    typeDictionary: TypeDictionary,
    namespaces: string[]
) {

    const nodeToBrowse = {
        browseDirection: BrowseDirection.Forward,
        includeSubtypes: false,
        nodeClassMask: makeNodeClassMask("Variable"),
        nodeId: dataTypeDictionaryTypeNode,
        referenceTypeId: resolveNodeId("HasComponent"),
        resultMask: makeResultMask("ReferenceType | IsForward | BrowseName | NodeClass | TypeDefinition")
    };
    const result = await session.browse(nodeToBrowse);
    const references = result.references || [];

    /* istanbul ignore next */
    if (references.length === 0) {
        return;
    }

    // request the Definition of each nodes
    const nodesToBrowse2 = references.map((ref: ReferenceDescription) => {