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vendor/symfony/http-kernel/CacheWarmer/WarmableInterface.php

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+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\HttpKernel\CacheWarmer;
+
+/**
+ * Interface for classes that support warming their cache.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+interface WarmableInterface
+{
+    /**
+     * Warms up the cache.
+     *
+     * @param string      $cacheDir Where warm-up artifacts should be stored
+     * @param string|null $buildDir Where read-only artifacts should go; null when called after compile-time
+     *
+     * @return string[] A list of classes or files to preload
+     */
+    public function warmUp(string $cacheDir, ?string $buildDir = null): array;
+}