php - Creating new laravel project via composer fails with error class ArrayLoader not found

Question

When I create a new composer project for laravel

composer create-project laravel/laravel laravel

I get the following error

> @php artisan package:discover --ansi

   Error

  Class 'SymfonyComponentTranslationLoaderArrayLoader' not found

  at vendor/nesbot/carbon/src/Carbon/Translator.php:80
     76▕     public function __construct($locale, TranslationFormatterMessageFormatterInterface $formatter = null, $cacheDir = null, $debug = false)
     77▕     {
     78▕         $this->initializing = true;
     79▕         $this->directories = [__DIR__.'/Lang'];
  ?  80▕         $this->addLoader('array', new TranslationLoaderArrayLoader());
     81▕         parent::__construct($locale, $formatter, $cacheDir, $debug);
     82▕         $this->initializing = false;
     83▕     }
     84▕

      +13 vendor frames
  14  [internal]:0
      IlluminateFoundationApplication::IlluminateFoundation{closure}()

      +5 vendor frames
  20  artisan:37
      IlluminateFoundationConsoleKernel::handle()
Script @php artisan package:discover --ansi handling the post-autoload-dump event returned with error code 1

I run it inside PHP 7.4.24 docker container (macOS) with the latest stable composer (2.1.8).

Full log https://pastebin.pl/view/bb4ae413

Answer 1

There seems to be a bug or incompatibility introduced in Symfony components on version 4.3.8.

Just add this to your composer.json:

 "conflict": {
        "symfony/symfony": "*",
        "symfony/translation": "v5.3.8",
        "symfony/messenger": "v5.3.8",
        "symfony/mailer": "v5.3.8",
        "symfony/notifier": "v5.3.8"
    },

Run composer update and the old versions will be installed. When 5.3.9 is released, the new ones will be installed automatically without having to change anything.

The core team is aware of this issue, and a fix will be surely released shortly.