Copy and Rename files in destination folder?

I was trying to copy my files to a new destination using fs and then rename them to like 1.png , 1.txt and so on but i always get an error here is my code :

const fs = require('fs');
const path = require('path')

const dir = 'files/newFiles'
const fileNames = fs.readdirSync('files')

for(let i = 0 ; i < fileNames.length ; i++) {

    if (!fs.existsSync(dir)){
        fs.mkdirSync(dir);
        if(!fs.existsSync(dir+'/image')) fs.mkdirSync(dir+'/image');
        if(!fs.existsSync(dir+'/txt')) fs.mkdirSync(dir+'/txt');
    }
    const ext = path.extname(fileNames[i])
    if(ext === '.png') return fs.copyFileSync(fileNames[i], dir+'/image/'+i+ext)
    if(ext === '.txt') return fs.copyFileSync(fileNames[i], dir+'/txt/'+i+ext)
}

here is the error message :

Error: ENOENT: no such file or directory, copyfile 'file1.png' -> 'files/newFiles/image/'

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