How to use the @commercetools/product-json-to-csv.mapHeaders function in @commercetools/product-json-to-csv

.each((product: Object): void => {
      // check what productType are we exporting
      if (product.productType && product.productType !== lastProductType) {
        lastProductType = product.productType
        lastExport = exportByProductType[lastProductType]

        // if we haven't started exporting this productType yet
        if (!lastExport) {
          // generate a temp file name
          const fileName: string = `${slugify(product.productType)}.xlsx`
          const filePath: string = path.join(tmpDir, fileName)

          // create headers and file stream
          lastExport = {
            productType: lastProductType,
            headers: mapHeaders(Object.keys(product)),
            excel: new ProductExcel(fs.createWriteStream(filePath)),
          }

          // write a header row to XLSX file
          const headerNames: Array = lastExport.headers.map(
            header => header.label
          )
          lastExport.excel.writeHeader(headerNames)

          // register new export in cache
          exportByProductType[lastProductType] = lastExport
        }
      }

      // we have lastExport variable containing all necessary info
      lastExport.excel.writeRow(mapValues(lastExport.headers, product))

export function writeToSingleXlsxFile(
  productStream: highlandStream,
  output: stream$Writable,
  logger: Object,
  headers: Array
) {
  const mappedHeaders = mapHeaders(headers)
  const headerNames = mappedHeaders.map(header => header.label)

  const excel = new ProductExcel(output)
  excel.writeHeader(headerNames)

  productStream
    .each(product => {
      const row = mapValues(mappedHeaders, product)
      if (row.join('')) excel.writeRow(row)
    })
    .done(() => {
      // finish workbook and close the stream
      excel.finish()
      logger.info('All products have been written to XLSX file')
    })
}