AddToWishlist.php

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<?php
namespace Magento\Wishlist\Block;

class AddToWishlist extends \Magento\Framework\View\Element\Template
{
    private $productTypes;

    public function __construct(
        \Magento\Framework\View\Element\Template\Context $context,
        array $data = []
    ) {
        parent::__construct(
            $context,
            $data
        );
    }

    public function getWishlistOptions()
    {
        return ['productType' => $this->getProductTypes()];
    }

    private function getProductTypes()
    {
        if ($this->productTypes === null) {
            $this->productTypes = [];
            $block = $this->getLayout()->getBlock('category.products.list');
            if ($block) {
                $productCollection = $block->getLoadedProductCollection();
                $productTypes = [];
                foreach ($productCollection as $product) {
                    $productTypes[] = $this->escapeHtml($product->getTypeId());
                }
                $this->productTypes = array_unique($productTypes);
            }
        }
        return $this->productTypes;
    }

    protected function _toHtml()
    {
        if (!$this->getProductTypes()) {
            return '';
        }
        return parent::_toHtml();
    }
}