Corrections

const fs = require('fs');

fnListDir();

function fnListDir(sPath = '.')
//function fnListDir(sPath = __dirname)
{
	const aFile = fs.readdirSync(sPath);

	for (let sFile of aFile)
		console.log(sFile);
}

fs = require('fs')
fnListDir();

function fnListDir(sPath = '.')
{
	const aFile = fs.readdirSync(sPath);

	for (let sFile of aFile)
	{
		if (!sFile.startsWith('.'))
		  console.log(sFile);
	}
}

fs = require('fs')
fnListDir();

function fnListDir(sPath = '.')
{
	const aFile = fs.readdirSync(sPath)

	for (let sFile of aFile)
	{
		if (!sFile.startsWith('.'))
			fnDisplayFile(sFile, sPath);
	}
}

function fnDisplayFile(sFile, sPath)
{
	const TYPE_DIR	= 'DIR';
	const TYPE_FILE	= 'FILE';

	const stat	= fs.lstatSync(`${sPath}/${sFile}`);
	const sType	= (stat.isDirectory()) ? TYPE_DIR : TYPE_FILE;

	console.log(`${sType} ${sFile}`);
	console.log(sType sFile);

	return stat;
}

fs = require('fs');
os = require('os');

fnListDir();

function fnDisplayFile(sFile, sPath)
{
	const TYPE_DIR	= 'DIR';
	const TYPE_FILE	= 'FILE';

	const stat	= fs.lstatSync(`${sPath}/${sFile}`);
	const sType	= (stat.isDirectory()) ? TYPE_DIR : TYPE_FILE;
	const sUser	= os.userInfo(stat.uid).username;

	console.log(`${sType} ${sUser} ${sFile}`);

	return stat;
}

function fnListDir(sPath = '.')
{
	const aFile = fs.readdirSync(sPath)

	for (let sFile of aFile)
	{
		if (!sFile.startsWith('.'))
			fnDisplayFile(sFile, sPath);
	}
}

fs = require('fs');
os = require('os');

fnListDir();

function fnListDir(sPath = '.')
{
	const aFile = fs.readdirSync(sPath);

	for (let sFile of aFile)
	{
		if (!sFile.startsWith('.'))
			fnDisplayFile(sFile, sPath)
	}
}

function fnDisplayFile(sFile, sPath)
{
	const TYPE_DIR	= 'd';
	const TYPE_FILE	= '-';

	const aPerm		= 
	[
		'---',
		'--x',
		'-w-',
		'-wx',
		'r--',
		'r-x',
		'rw-',
		'rwx',
	];

	let stat	= fs.lstatSync(`${sPath}/${sFile}`);
	let sType	= (stat.isDirectory()) ? TYPE_DIR : TYPE_FILE;
	let sUser	= os.userInfo(stat.uid).username;
	let sPerm	= stat.mode.toString(8).slice(-3);

	for(let i=0; i<aPerm.length; i++)
	{
		let rIndex	= new RegExp(`${i}`, 'g');	
		sPerm = sPerm.replace(rIndex, aPerm[i]);
	}

	console.log(`${sType}${sPerm} ${sUser} ${sFile}`);

	return stat;
}

fs = require('fs');
os = require('os');

let sPath	= process.argv[2];
fnListDir(sPath);

function fnListDir(sPath = '.')
{
	const aFile = fs.readdirSync(sPath);

	for (let sFile of aFile)
	{
		if (!sFile.startsWith('.'))
			fnDisplayFile(sFile, sPath)
	}
}

function fnDisplayFile(sFile, sPath)
{
	const TYPE_DIR	= 'd';
	const TYPE_FILE	= '-';

	const aPerm		= 
	[
		'---',
		'--x',
		'-w-',
		'-wx',
		'r--',
		'r-x',
		'rw-',
		'rwx',
	];

	let stat	= fs.lstatSync(`${sPath}/${sFile}`);
	let sType	= (stat.isDirectory()) ? TYPE_DIR : TYPE_FILE;
	let sUser	= os.userInfo(stat.uid).username;
	let sPerm	= stat.mode.toString(8).slice(-3);

	for(let i=0; i<aPerm.length; i++)
	{
		let rIndex	= new RegExp(`${i}`, 'g');	
		sPerm = sPerm.replace(rIndex, aPerm[i]);
	}

	console.log(`${sType}${sPerm} ${sUser} ${sFile}`);

	return stat;
}

fs = require('fs');
os = require('os');

let aPath	= process.argv.slice(2);

if(aPath.length===0)
	aPath.push('.');

for (let sPath of aPath)
	fnListDir(sPath);

function fnListDir(sPath)
{
	const aFile = fs.readdirSync(sPath);

	for (let sFile of aFile)
	{
		if (!sFile.startsWith('.'))
			fnDisplayFile(sFile, sPath)
	}
}

function fnDisplayFile(sFile, sPath)
{
	const TYPE_DIR	= 'd';
	const TYPE_FILE	= '-';

	const aPerm		= 
	[
		'---',
		'--x',
		'-w-',
		'-wx',
		'r--',
		'r-x',
		'rw-',
		'rwx',
	];

	let stat	= fs.lstatSync(`${sPath}/${sFile}`);
	let sType	= (stat.isDirectory()) ? TYPE_DIR : TYPE_FILE;
	let sUser	= os.userInfo(stat.uid).username;
	let sPerm	= stat.mode.toString(8).slice(-3);

	for(let i=0; i<aPerm.length; i++)
	{
		let rIndex	= new RegExp(`${i}`, 'g');	
		sPerm = sPerm.replace(rIndex, aPerm[i]);
	}

	console.log(`${sType}${sPerm} ${sUser} ${sFile}`);

	return stat;
}

fs = require('fs')
os = require('os')


function displayFile(opts, sFile, sPath) {
	const stat	= fs.lstatSync(`${sPath}/${sFile}`)

	if (opts['-l'] == false) {
		console.log(sFile)
		return stat
	}

	const d		 = stat.isDirectory() ? 'd' : '-'
	const chmod = stat.mode.toString(8).slice(-3)
																		 .replaceAll('0', '---').replaceAll('1', '--x').replaceAll('2', '-w-')
																		 .replaceAll('3', '-wx').replaceAll('4', 'r--').replaceAll('5', 'r-x')
																		 .replaceAll('6', 'rw-').replaceAll('7', 'rwx')
	const user	= os.userInfo(stat.uid).username

	console.log(`${d}${chmod} ${user} ${sFile}`)

	return stat
}

function listDir(opts, sPath = '.') {
	const aFile = fs.readdirSync(sPath)

	for (let sFile of aFile) {
		if (sFile.startsWith('.') && opts['-a'] || !sFile.startsWith('.')) {
			displayFile(opts, sFile, sPath)
		}
	}
}


opts = {
	'-l': false,
	'-a': false,
	'sPathectories': []
}

for (let opt of process.argv.slice(2)) {
	if (opt == '-l')
		opts['-l'] = true
	else if (opt == '-a')
		opts['-a'] = true
	else
		opts['sPathectories'].push(opt)
}

if (opts['sPathectories'].length == 0) {
		opts['sPathectories'].push('.')
}

for (let sPathectory of opts['sPathectories']) {
	listDir(opts, sPathectory)
}