Diagramm von Excel nach PNG exportieren

// For complete examples and data files, please go to https://github.com/aspose-cells-cloud/aspose-cells-cloud-node/
    const { LightCellsApi, PostExportRequest } = require("asposecellscloud");
    const localPath = "C:/";
    var fs = require('fs');
    var path = require('path');
    const cellsApi = new LightCellsApi(process.env.ProductClientId, process.env.ProductClientSecret);
    const AssemblyTestXlsx = "assemblytest.xlsx";
    var dataAssemblyTestXlsx =fs.createReadStream(localPath  + AssemblyTestXlsx);
    const DataSourceXlsx = "datasource.xlsx";
    var dataDataSourceXlsx =fs.createReadStream(localPath  + DataSourceXlsx);
    var req = new PostExportRequest({
      file:{AssemblyTestXlsx:dataAssemblyTestXlsx ,DataSourceXlsx:dataDataSourceXlsx },
      objectType : "chart",
      format: "png",
    });
    cellsApi.postExport(req)
      .then((result) => {
        let buff = new Buffer(result.body.files[0].fileContent, 'base64');
        fs.writeFileSync(result.body.files[0].filename, buff);
    });