text: //
  // Formats a number to a human-readable string of bytes or bits such as "100 MB"
  //
  export function formatBytes(bytes, options) {
    options = Object.assign({
      unit: 'bytes',
      locale: undefined
    }, options);
    const byteUnits = ['B', 'kB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'];
    const bitUnits = ['b', 'kbit', 'Mbit', 'Gbit', 'Tbit', 'Pbit', 'Ebit', 'Zbit', 'Ybit'];
    const units = options.unit === 'bytes' ? byteUnits : bitUnits;
    const isNegative = bytes < 0;
    bytes = Math.abs(bytes);
    if (bytes === 0)
      return '0 B';
    const i = Math.min(Math.floor(Math.log10(bytes) / 3), units.length - 1);
    const num = Number((bytes / Math.pow(1000, i)).toPrecision(3));
    const numString = num.toLocaleString(options.locale);
    const prefix = isNegative ? '-' : '';
    return `${prefix}${numString} ${units[i]}`;
  }
  