A human readable bytes adapter for TypeScript/JavaScript that is actually (and finally) readable.

humanReadableBytesAdapter.ts

function humanReadableBytesAdapter(rawBytesQuantity: number): string {
  const bytesUnits = ['bytes', 'KiB', 'MiB', 'GiB', 'TiB', 'PiB', 'EiB', 'ZiB', 'YiB'];
  let unitSuffixIndex = 0;

  const isQuantityNegative = rawBytesQuantity < 0;
  const rawBytesQuantityAbsolute = Math.abs(rawBytesQuantity);  
  let shortestBytesNumeral = rawBytesQuantityAbsolute;
  
  while (shortestBytesNumeral >= 1024 && unitSuffixIndex < bytesUnits.length - 1) {
      shortestBytesNumeral /= 1024;
      unitSuffixIndex++;
  }

  let shortestBytesNumeralString = shortestBytesNumeral.toFixed(2);
  if (isQuantityNegative) {
    shortestBytesNumeralString = "-" + shortestBytesNumeralString;
  }

  return `${shortestBytesNumeralString} ${bytesUnits[unitSuffixIndex]}`;
}