PHP SpreadSheet can’t find the function to auto size column width

I simply want the columns to autosized. I am using php spreadsheet and I can’t find how to do it. I have searched other questions but they are using functions that i can’t event find in my lib worksheet.php like getActiveSheet() Any advise ? This is my code

$spreadsheet = new Spreadsheet();
$sheet = $spreadsheet->getActiveSheet();
$sheet->setCellValue('A1', 'Projects First Year');
$sheet->setCellValue('B1', 'Grades');

$sheet->setCellValue('A2', 'PHP Project 2020');
$sheet->setCellValue('B2', $_SESSION['phpScore']);

Answer

For spreadsheet the answer is:

require 'vendor/autoload.php';

use PhpOfficePhpSpreadsheetSpreadsheet;
use PhpOfficePhpSpreadsheetWriterXlsx;
use PhpOfficePhpSpreadsheetIOFactory;

  foreach (range('A','B') as $col) {
   $sheet->getColumnDimension($col)->setAutoSize(true);
}