export default function fileSizeSI(
  a: number,
  b?: typeof Math,
  c?: (p: number) => number,
  d?: number,
  e?: number
): string {
  return (
    ((b = Math), (c = b.log), (d = 1e3), (e = (c(a) / c(d)) | 0), a / b.pow(d, e)).toFixed(2) +
    ' ' +
    (e ? 'kMGTPEZY'[--e] + 'B' : 'Bytes')
  );
}