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system/View/ViewDecoratorInterface.php

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+<?php
+
+declare(strict_types=1);
+
+/**
+ * This file is part of CodeIgniter 4 framework.
+ *
+ * (c) CodeIgniter Foundation <admin@codeigniter.com>
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace CodeIgniter\View;
+
+/**
+ * View Decorators are simple classes that are given the
+ * chance to modify the output from the view() calls
+ * prior to it being cached.
+ */
+interface ViewDecoratorInterface
+{
+    /**
+     * Takes $html and has a chance to alter it.
+     * MUST return the modified HTML.
+     */
+    public static function decorate(string $html): string;
+}