unopim/unopim

use Illuminate\Support\Facades\Storage;

class ProductObserver
{
    public function deleted($product)
    {
        Storage::deleteDirectory('product/'.$product->id);
    }
}

use Webkul\Product\Models\ProductProxy;
use Webkul\Product\Observers\ProductObserver;

class ProductServiceProvider extends ServiceProvider
{
    public function boot(): void
    {
        // ...

        ProductProxy::observe(ProductObserver::class);
    }

    // ...
}