hado/core/app/Channels/WebChannel.php

<?php

namespace App\Channels;

use App\Enums\Presence;
use App\Models\Delivery;
use App\Models\Event;
use App\Models\User;
use Illuminate\Support\Facades\Cache;

/** Инбокс. Ничего не шлёт (страница и так показывает всё), но присутствие определяет. */
final class WebChannel implements ChannelDriver
{
    public function presence(User $user, array $config): Presence
    {
        return Cache::has("heartbeat:{$user->id}") ? Presence::Present : Presence::Absent;
    }

    public function deliver(Event $event, User $user, array $config, Delivery $delivery): DeliveryOutcome
    {
        return DeliveryOutcome::ok();
    }

    public function onDone(Event $event, Delivery $delivery): void {}
}