drupal-quartiersdedemain/web/themes/custom/quartiers_de_demain/js/quartiers_de_demain.js

/**
 * @file
 * quartiers_de_demain behaviors.
 */
 (function (Drupal) {

    'use strict';
  
    Drupal.behaviors.quartiers_de_demain = {
      attach: function (context, settings) {
  
        console.log('It works!');
  
      }
    };
  
    
  } (Drupal));
  
  jQuery(document).ready(function($){
 
  
  });