Get data from ExportTo function without open “Save As” window

How get the html content from “exportTo” function without open the “Save As” window? Something like the code below:

this.webDataRocksPivot.webDataRocks.exportTo( "html",
{
   header:"A header",
   footer: "A footer",
   filename: "A file name",
   destinationType: "file",
},
function (fileData) {
     //I need thisdata without open the "SaveAs" window
     console.log(fileData.data);
});