Update to drupal 8.0.0-rc1. For more information, see https://www.drupal.org/node/2582663

vendor/symfony/translation/Extractor/ExtractorInterface.php

@@ -0,0 +1,38 @@
+<?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\Translation\Extractor;
+
+use Symfony\Component\Translation\MessageCatalogue;
+
+/**
+ * Extracts translation messages from a directory or files to the catalogue.
+ * New found messages are injected to the catalogue using the prefix.
+ *
+ * @author Michel Salib <michelsalib@hotmail.com>
+ */
+interface ExtractorInterface
+{
+    /**
+     * Extracts translation messages from files, a file or a directory to the catalogue.
+     *
+     * @param string|array     $resource  files, a file or a directory
+     * @param MessageCatalogue $catalogue The catalogue
+     */
+    public function extract($resource, MessageCatalogue $catalogue);
+
+    /**
+     * Sets the prefix that should be used for new found messages.
+     *
+     * @param string $prefix The prefix
+     */
+    public function setPrefix($prefix);
+}