Conditions.php

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<?php
namespace Magento\Widget\Helper;

use Magento\Framework\Data\Wysiwyg\Normalizer;
use Magento\Framework\App\ObjectManager;
use Magento\Framework\Serialize\Serializer\Json;

class Conditions
{
    private $serializer;

    private $normalizer;

    public function __construct(
        Json $serializer = null,
        Normalizer $normalizer = null
    ) {
        $this->serializer = $serializer ?: ObjectManager::getInstance()->get(Json::class);
        $this->normalizer = $normalizer ?: ObjectManager::getInstance()->get(Normalizer::class);
    }

    public function encode(array $value)
    {
        return $this->normalizer->replaceReservedCharacters($this->serializer->serialize($value));
    }

    public function decode($value)
    {
        return $this->serializer->unserialize(
            $this->normalizer->restoreReservedCharacters($value)
        );
    }
}