YamlDiscovery.php

<?php

namespace Drupal\Core\Discovery;

use Drupal\Component\Discovery\YamlDiscovery as ComponentYamlDiscovery;
use Drupal\Component\Serialization\Exception\InvalidDataTypeException;
use Drupal\Core\Serialization\Yaml;

/**
 * Provides discovery for YAML files within a given set of directories.
 *
 * This overrides the Component file decoding with the Core YAML implementation.
 */
class YamlDiscovery extends ComponentYamlDiscovery {
    
    /**
     * {@inheritdoc}
     */
    protected function decode($file) {
        try {
            return Yaml::decode(file_get_contents($file)) ?: [];
        } catch (InvalidDataTypeException $e) {
            throw new InvalidDataTypeException($file . ': ' . $e->getMessage(), $e->getCode(), $e);
        }
    }

}