code: function sizeToValueAndUnits(sizeValue) {
      var sizeUnits = 0;
      if (sizeValue) {
          for (sizeUnits = 0; sizeUnits < 4 && parseInt(sizeValue / 1024, 10) *
                  1024 === sizeValue; sizeUnits += 1) {
              sizeValue /= 1024;
          }
      } else {
          sizeValue = '';
      }
      return {sizeUnits: sizeUnits, sizeValue: sizeValue};
  }
docs: /* Convert a number of bytes to a value and units.  The units are the
  powers of 1024.  For instance, 4096 will result in (4, 1).
  @param sizeValue: number of bytes to convert.  If this is falsy, an
  empty string is returned.
  @return .sizeValue: the new size value.  This may be an empty string.
  @return .sizeUnits: the size units (0-based powers of 1024).