Integrate XLSX into Google Sheets - google-apps-script

Question

A file in XLSX format comes to the mail, I want the data from XLSX to be transferred to a Google spreadsheet via Google Drive, I found the code, but it gives an error.
ReferenceError: fileInfo is not defined
function importProduct() {
var requete ="1yflLPUWI2Dqz1P0kXabg-eFA3nhYmujA"
var threads = GmailApp.search(requete);
for (var i = 0; i \< threads.length; i++) {
var messages = threads\[i\].getMessages();
Logger.log(messages)
}
const file = Drive.Files.insert(fileInfo, excelFile, {convert: true})
}
function getExcelFile(thread)
{
var messages = thread.getMessages();
var len = messages.length;
var message = messages\[len-1\]
var attachments = message.getAttachments();
var xlsxBlob = attachments\[0\];
Logger.log(xlsxBlob.getContentType())
var convertedSpreadsheetId = Drive.Files.insert({mimeType: MimeType.GOOGLE_SHEETS}, xlsxBlob).id;
var filename = xlsxBlob.getName();
var tabName = filename.substring(13).slice(0,filename.length-18);
var sheet = SpreadsheetApp.openById(convertedSpreadsheetId).getSheets()\[0\];
var destination = SpreadsheetApp.openById("1lfDEEn1PpTh5dja6VOPvKvMVPPCBA5xgV6uVRemKmcc");
var sss=destination.getSheetByName("All");
Drive.Files.remove(convertedSpreadsheetId);
labelName='Addop';
deleteForever(labelName);
}