<?php

/*
 * This file is part of the Sylius package.
 *
 * (c) Paweł Jędrzejewski
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

declare(strict_types=1);

namespace Sylius\Component\Inventory\Model;

class InventoryUnit implements InventoryUnitInterface
{
    /** @var mixed */
    protected $id;

    protected ?StockableInterface $stockable = null;

    public function getId()
    {
        return $this->id;
    }

    public function getStockable(): ?StockableInterface
    {
        return $this->stockable;
    }

    public function setStockable(StockableInterface $stockable): void
    {
        $this->stockable = $stockable;
    }
}

<?php

/*
 * This file is part of the Sylius package.
 *
 * (c) Paweł Jędrzejewski
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

declare(strict_types=1);

namespace Sylius\Component\Inventory\Model;

class InventoryUnit implements InventoryUnitInterface
{
    /** @var mixed */
    protected $id;

    /**
     * @var StockableInterface|null
     */
    protected $stockable;

    public function getId()
    {
        return $this->id;
    }

    public function getStockable(): ?StockableInterface
    {
        return $this->stockable;
    }

    public function setStockable(StockableInterface $stockable): void
    {
        $this->stockable = $stockable;
    }
}

Remove types in public and protected properies in not final classes (in components)
Remove types in public and protected properies in not final classes (in components)
