'use strict'; const path = require('path'); const getSize = require('./'); if (!process.env.FOLDER) { throw new Error('FOLDER env var needed'); } getSize(path.resolve(process.env.FOLDER), (err, size) => { if (err) { throw err; } console.log(size + ' bytes'); console.log((size / 1024 / 1024).toFixed(2) + ' Mb'); });