Function formatSize

cli/tar.js:10–20

const tar = require('tar-stream');

const formatSize = size => {
  let sizes = [[2, 'M'], [1, 'k']];
  while (sizes.length) {
    let checkSize = sizes.shift();
    let limit = Math.pow(1024, checkSize[0]);
    if (size > limit) {
      return `${(size / limit).toFixed(2)} ${checkSize[1]}B`
    }
  }
  return `${size} B`;
};

function readFiles (base, properties, dir, data) {