the latest code

vendor/symfony/console/Helper/HelperInterface.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\Console\Helper;
+
+/**
+ * HelperInterface is the interface all helpers must implement.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+interface HelperInterface
+{
+    /**
+     * Sets the helper set associated with this helper.
+     */
+    public function setHelperSet(?HelperSet $helperSet): void;
+
+    /**
+     * Gets the helper set associated with this helper.
+     */
+    public function getHelperSet(): ?HelperSet;
+
+    /**
+     * Returns the canonical name of this helper.
+     */
+    public function getName(): string;
+}