newsupernova/vendor/magento/magento-composer-installer/CodeSniffer.conf

<?php
 $phpCodeSnifferConfig = array (
  'default_standard' => 'FireGento',
  'report_format' => 'summary',
  'show_warnings' => '0',
  'show_progress' => '1',
  'report_width' => '120',
  'installed_paths' => __DIR__.'/vendor/firegento/',
);