svrjs/src/utils/sizify.js

function sizify(bytes, addI) {
  if (bytes == 0) return "0";
  if (bytes < 0) bytes = -bytes;
  const prefixes = ["", "K", "M", "G", "T", "P", "E", "Z", "Y", "R", "Q"];
  let prefixIndex = Math.floor(
    Math.log2 ? Math.log2(bytes) / 10 : Math.log(bytes) / (Math.log(2) * 10),
  );
  if (prefixIndex >= prefixes.length - 1) prefixIndex = prefixes.length - 1;
  let prefixIndexTranslated = Math.pow(2, 10 * prefixIndex);
  let decimalPoints =
    2 -
    Math.floor(
      Math.log10
        ? Math.log10(bytes / prefixIndexTranslated)
        : Math.log(bytes / prefixIndexTranslated) / Math.log(10),
    );
  if (decimalPoints < 0) decimalPoints = 0;
  return (
    Math.ceil((bytes / prefixIndexTranslated) * Math.pow(10, decimalPoints)) /
      Math.pow(10, decimalPoints) +
    prefixes[prefixIndex] +
    (prefixIndex > 0 && addI ? "i" : "")
  );
}

module.exports = sizify;