luhn-generator/update/node_modules/path-exists/index.js

A generator of numbers that passes the validation of Luhn algorithm or Luhn formula, also known as the 'modulus 10' or 'mod 10' algorithm

'use strict';
const fs = require('fs');

module.exports = fp => new Promise(resolve => {
	fs.access(fp, err => {
		resolve(!err);
	});
});

module.exports.sync = fp => {
	try {
		fs.accessSync(fp);
		return true;
	} catch (err) {
		return false;
	}
};