Clear SSI files if all or (all) pages cache clear triggers

Classes/Cache/ClearCache.php

@@ -0,0 +1,39 @@
+<?php
+
+declare(strict_types=1);
+
+namespace AUS\SsiInclude\Cache;
+
+use AUS\SsiInclude\ViewHelpers\RenderIncludeViewHelper;
+use TYPO3\CMS\Core\Core\Environment;
+
+class ClearCache
+{
+    /** @param array<mixed> $parameters */
+    public function clearCache(array $parameters): void
+    {
+        if (isset($parameters['cacheCmd']) && ($parameters['cacheCmd'] === 'pages' || $parameters['cacheCmd'] === 'all')) {
+            $path = Environment::getPublicPath() . RenderIncludeViewHelper::SSI_INCLUDE_DIR;
+            $this->removeFiles($path);
+        }
+    }
+
+    protected function removeFiles(string $dir): void
+    {
+        if (is_dir($dir)) {
+            $objects = scandir($dir);
+            if (!$objects) {
+                return;
+            }
+
+            foreach ($objects as $object) {
+                if ($object !== '.' && $object !== '..') {
+                    $filePath = $dir . DIRECTORY_SEPARATOR . $object;
+                    if (is_file($filePath) && is_writable($filePath)) {
+                        unlink($filePath);
+                    }
+                }
+            }
+        }
+    }
+}

ext_localconf.php

@@ -1,6 +1,10 @@
 <?php
 
+use AUS\SsiInclude\Cache\ClearCache;
+
 if (!defined('TYPO3_COMPOSER_MODE')) {
     // include autoload if this is the TER version
     require __DIR__ . '/vendor/autoload.php';
 }
+
+$GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['t3lib/class.t3lib_tcemain.php']['clearCachePostProc'][] = ClearCache::class . '->clearCache';