تحويل XLSX إلى XLS

// For complete examples and data files, please go to https://github.com/aspose-cells-cloud/aspose-cells-cloud-node/
    const { CellsApi, CellsWorkbook_PutConvertWorkbookRequest } = require("asposecellscloud");
    const localPath = "../TestData/source/";
    var fs = require('fs');
    var path = require('path');
    const cellsApi = new CellsApi(process.env.ProductClientId, process.env.ProductClientSecret);
    var req = new CellsWorkbook_PutConvertWorkbookRequest({
        file: fs.createReadStream(localPath + "datasource.xlsx"),
        format: "xls",
    });
    cellsApi.cellsWorkbookPutConvertWorkbook(req)
        .then((result) => {
        console.log(result)
    });