Normally composer remove used like this is enough:
composer remove vendor/package
But if a Composer package is removed and the "config" cache is not cleaned you cannot clean it. When you try like so
php artisan config:clear
you can get an error In ProviderRepository.php line 208:
Class 'Laracasts\Flash\FlashServiceProvider' not found
This is a dead end, unless you go deleting files:
rm bootstrap/cache/config.php
And this is Laravel 5.6 I'm talking about, not some kind of very old stuff.
It happens usually on automated deployment, when you copy files of a new release on top of old cache. Even if you cleared the cache before copying. You end up with an old cache and a new composer.json file.
