Unable to queue NotificationSent event listener for notifications with attachments

[antennaio]

Laravel Version

10.13.1

PHP Version

8.2.4

Database Driver & Version

MySQL 8 (Laravel Sail)

Description

Hello!

I believe I found a problem in Laravel 10.13.1 introduced by a recent change.

The issue is related to notifications with attachments (like PDF files). Due to the change, the NotificationSent event listeners can't be queued anymore. An InvalidPayloadException exception is thrown.

I included more information in the "Steps To Reproduce" section below.

Steps To Reproduce

Starting with a fresh installation of Laravel 10.13.1+:

1. Set up a notification with a file attachment (binary file such as PDF)

class ExampleNotification extends Notification
{
    public function via(object $notifiable): array
    {
        return ['mail'];
    }

    public function toMail(object $notifiable): MailMessage
    {
        return (new MailMessage)
            ->line('Example notification with attachment.')
            ->attach(resource_path('files/sample.pdf'), [
                'as' => 'sample.pdf',
                'mime' => 'application/pdf',
             ]);
    }
}

2. Set up a NotificationSent event listener

class ExampleListener implements ShouldQueue
{
    public function handle(NotificationSent $event): void
    {
        //
    }
}

3. Listen to NotificationSent event

class EventServiceProvider extends ServiceProvider
{
    protected $listen = [
        NotificationSent::class => [
            ExampleListener::class,
        ],
    ];
}

4. Notify a user

$user->notify(new \App\Notifications\ExampleNotification());

Result:

See Illuminate\Queue\InvalidPayloadException with Unable to JSON encode payload. Error code: 5. message.