<?php  namespace App\Models;  use Illuminate\Support\Collection; use App\Observers\ShipmentObserver; use Illuminate\Database\Eloquent\Relations\BelongsTo;  class Shipment extends Model { 	public ?Collection $productsObjects = null;  	public function order(): BelongsTo{}  	protected static function boot(): void 	{ 		parent::boot();  		static::observe(ShipmentObserver::class); 	} }