function bytes( value, precision = 2 ) {
  value = Math.abs( value )
  var order = Math.round( Math.log2( value ) / 10 )
  order = Math.max( 0, Math.min( order, bytes.units.length - 1 ) ) || 0
  value = value / Math.pow( 1024, order )
  return `${value.toFixed(precision)} ${bytes.units[order]}`
}

bytes.units = 'B,KB,MB,GB,TB,PB,EB,ZB,YB'.split(',')