Google Sheet: Replace file with the same name - google-apps-script

Question

I'm currently generating a PDF file from an active sheet. Is there a way to overwrite or replace the file in the google drive without putting it to trash? I have this code that I saw online.
if (files.hasNext()) {
files.next().setTrashed(true);
}
Am I using the code right or there is another way for me to do it?
I used that code on the function below.
function _exportBlob(blob, fileName) {
var timeZone = Session.getScriptTimeZone();
var date = Utilities.formatDate(new Date(), timeZone, "yyyy");
var ss = SpreadsheetApp.getActiveSpreadsheet();
var fileName = "FORM137 - " + ss.getRange("REPORT CARD!D12").getValue() + " - ARCS" + date;
var ssID = ss.getId();
var ssFile = DriveApp.getFileById(ssID);
blob = blob.setName(fileName)
var parentFolder = DriveApp.getFileById(ss.getId()).getParents().next();
var subFolder = parentFolder.getFoldersByName("CARDS").next();
var files = subFolder.getFilesByName(getFilename());
if (files.hasNext()) {
files.next().setTrashed(true);
}
var pdfFile = subFolder.createFile(blob);
if (pdfFile) {
const htmlOutput = HtmlService
.createHtmlOutput('<p>Click to open ' + fileName + '</p>')
.setWidth(300)
.setHeight(80)
SpreadsheetApp.getUi().showModalDialog(htmlOutput, 'Export Successful')
}
}
Here's the getFilename function:
function getFilename() {
var ss = SpreadsheetApp.getActive();
var filename = "FORM137 - " + ss.getRange("REPORT CARD!D12").getValue() + " - ARCS" + date;
return filename;
}

Answer 1

I believe your goal as follows.
You want to overwrite blob to the existing file of getFilename().
In this case, I would like to propose to use the method of "Files: update" in Drive API.
Before you use this script, please enable Drive API at Advanced Google services.
From:
var files = subFolder.getFilesByName(getFilename());
if (files.hasNext()) {
files.next().setTrashed(true);
}
var pdfFile = subFolder.createFile(blob);
To:
var files = subFolder.getFilesByName(getFilename());
var pdfFile = files.hasNext() ? DriveApp.getFileById(Drive.Files.update({}, files.next().getId(), blob).id) : subFolder.createFile(blob);
In this modification, when the file of getFilename() is not existing, a new file is created.
Reference:
Files: update