docs: function errorEvent( err ) {
    var bind
  
    if ( err.syscall !== 'listen' ) {
      throw err
    }
  
    bind = typeof err.port === 'string' ? 'Pipe ' : 'Port '
    bind += err.port
  
    switch ( err.code ) {
      case 'EACCES':
        console.error( '[error]', new Date(), bind, 'requires elevated privileges' )
        throw err
  
      case 'EADDRINUSE':
        console.error( '[error]', new Date(), bind, 'is already in use' )
        throw err
  
      default:
        throw err
    }
  }