Custom Intl.NumberFormat units

custom-file-size-units.js

sizeFormatter = new Intl.NumberFormat([], {
  style: "unit",
  unit: "byte",
  notation: "compact",
  unitDisplay: "narrow",
});

(_bytes) => {
  const units = { B: " bytes", KB: " kb", MB: " mb", GB: " gb", TB: " tb" };
  const parts = sizeFormatter.formatToParts(_bytes);
  const vo: any = parts.reduce(
    (a, part: Intl.NumberFormatPart) => {
      a[part.type] = part.value;
      return a;
    },
    { decimal: "", fraction: "", compact: "" },
  );
  return `${vo.integer}${vo.decimal}${vo.fraction}  ${units[`${vo.compact}${vo.unit}`]}`;
}