laravel_demo/app/Events/CommentAdded.php

<?php

namespace App\Events;

use Illuminate\Broadcasting\Channel;
use Illuminate\Broadcasting\InteractsWithSockets;
use Illuminate\Broadcasting\PresenceChannel;
use Illuminate\Broadcasting\PrivateChannel;
use Illuminate\Contracts\Broadcasting\ShouldBroadcast;
use Illuminate\Foundation\Events\Dispatchable;
use Illuminate\Queue\SerializesModels;

use App\Models\Comment;

class CommentAdded
{
    use Dispatchable, InteractsWithSockets, SerializesModels;

    public Comment $comment;

    /**
     * Create a new event instance.
     */
    public function __construct(Comment $comment)
    {
    	$this->comment = $comment;
    }
}