argue-2.0.0-alpha4/modules/argue_demo/argue_demo.module

<?php

/**
 * Implements hook_ENTITY_TYPE_view().
 */
function argue_demo_node_view(array &$build, \Drupal\Core\Entity\EntityInterface $entity, \Drupal\Core\Entity\Display\EntityViewDisplayInterface $display, $view_mode)
{
  $name = \Drupal::routeMatch()->getRouteName();

}