humanSize.js

const humanSize = bytes => {
  if (bytes === 0) return 'n/a'

  const i = Math.floor(Math.log(Math.abs(bytes)) / Math.log(1024))

  const sizes = ['B', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB']

  return `${(bytes / Math.pow(1024, i)).toFixed(1)} ${sizes[i]}`
}

console.log(humanSize(0))

console.log(humanSize(-1000))

console.log(humanSize(1024))

console.log(humanSize(2048))

console.log(humanSize(9974327))

console.log(humanSize(10000000000))