Node.js script rename the anime filename order by original name to format 'SXXEXX.XXX'

rename.js

var fs = require('fs');
const SeasonNum = 1 // Change season Number
const baseDir = `./Season ${pad(SeasonNum, 2)}/`;
var files = fs.readdirSync(baseDir);

const prefix = `S${pad(SeasonNum, 2)}`
let counter = 1;
files.forEach(element => {
    const destName = `${prefix}E${pad(counter, 2)}`;
    const ext = element.split('.').pop();
    console.log(`Rename ${element} -> ${destName}.${ext}`);
    counter++;
});


const readline = require('readline').createInterface({
  input: process.stdin,
  output: process.stdout
});

readline.question('Are you sure? ', ans => {
  if (ans == "y") {
	 let counter = 1;
	files.forEach(element => {
		const destName = `${prefix}E${pad(counter, 2)}`;
		const ext = element.split('.').pop();
		console.log(`Rename ${baseDir}${element} -> ${baseDir}${destName}.${ext}`);
		fs.renameSync(`${baseDir}${element}`, `${baseDir}${destName}.${ext}`);
		counter++;
	}); 
  }
  readline.close();
});

function pad(num, size) {
    var s = "000000000" + num;
    return s.substr(s.length-size);
}