/var/www/html/back/app/Providers/AppServiceProvider.php
<?php

declare(strict_types=1);

namespace App\Providers;

use Illuminate\Support\ServiceProvider;

class AppServiceProvider extends ServiceProvider
{
    /**
     * Register any application services.
     */
    public function register(): void
    {
        if ($this->app->environment('local')) {
            $this->app->register(\Laravel\Telescope\TelescopeServiceProvider::class);
            $this->app->register(TelescopeServiceProvider::class);

            $this->app->register(\Barryvdh\Debugbar\ServiceProvider::class);
            $loader = \Illuminate\Foundation\AliasLoader::getInstance();
            $loader->alias('Debugbar', \Barryvdh\Debugbar\Facades\Debugbar::class);
        }
    }

    /**
     * Bootstrap any application services.
     */
    public function boot(): void
    {}
}