Google Apps script created file is not PDF - pdf

Question

I'm trying to create a PDF file with this code:
var name = "test.pdf";
var url = 'https://docs.google.com/spreadsheets/d/' + newSpreadsheetID + '/export?exportFormat=pdf&format=pdf' +
'&size=A4' +
'&portrait=true' +
'&fitw=true' + // fit to width, false for actual size
'&sheetnames=false&printtitle=false&pagenumbers=false' +
'&gridlines=false' +
'&fzr=false' + // do not repeat frozen rows on each page
'&gid='+SheetID; //the sheet's Id
var pdf = UrlFetchApp.fetch(url);
var pdf = pdf.getBlob().setName(name);
DocsList.createFile(pdf);
This code creates a file but the file contains just plain text, can you guys help me to get it into PDF format?

Answer 1

First off, DocsList was deprecated (https://developers.google.com/apps-script/reference/docs-list/docs-list). So I think we should use DriveApp this time.
I ignored the parameters you used to format the pdf, the script can be simply as -
var sheet = DriveApp.getFileById(spreadsheetId);
DriveApp.createFile(sheet.getAs("application/pdf"));
Please let me know if you want more elaboration. :)

Answer 2

I made a few changes and got your call working. I don't know where the documentation for the export settings are, but some of them don't work such as "gridlines". Also below is a 2 line example of the same thing.
function makePDF(){
var newSpreadsheetID = SpreadsheetApp.getActive().getId()
var SheetID="Sheet1";
var name = "test.pdf";
var url = 'https://docs.google.com/spreadsheets/d/' + newSpreadsheetID + '/export?exportFormat=pdf&format=pdf'; +
'&size=A4' +
'&portrait=true' +
'&fitw=true' + // fit to width, false for actual size
'&sheetnames=false&printtitle=false&pagenumbers=false' +
'&gridlines=false' +
'&fzr=false'; + // do not repeat frozen rows on each page
'&gid='+SheetID; //the sheet's Id
var pdf = UrlFetchApp.fetch(url,{headers: {authentication:"Bearer " + ScriptApp.getOAuthToken()}, muteHttpExceptions:true}).getBlob();
pdf.setName(name);
DriveApp.createFile(pdf);
}
function simplePDFConvert(){
var ss = SpreadsheetApp.openById( spreadSheetId );
DriveApp.createFile(ss.getBlob());
}