update

wp-content/plugins/youtube-feed-pro/vendor/smashballoon/customizer/app/Tabs/Manager.php

@@ -0,0 +1,35 @@
+<?php
+
+namespace Smashballoon\Customizer\Tabs;
+
+use Smashballoon\Stubs\Traits\Singleton;
+/** @internal */
+class Manager
+{
+    use Singleton;
+    /**
+     * @var Tab[]
+     */
+    private $tabs = [];
+    /**
+     * @param Tab $tab
+     *
+     * @return void
+     */
+    public function register_tab(\Smashballoon\Customizer\Tabs\Tab $tab)
+    {
+        $this->tabs[] = $tab;
+    }
+    /**
+     * @return array
+     */
+    public function get_tabs()
+    {
+        $tabs = [];
+        foreach ($this->tabs as $tab) {
+            $section_id = $tab->get_id();
+            $tabs[$section_id] = ['id' => $section_id, 'heading' => $tab->get_heading(), 'sections' => $tab->get_sections()];
+        }
+        return $tabs;
+    }
+}

wp-content/plugins/youtube-feed-pro/vendor/smashballoon/customizer/app/Tabs/Tab.php

@@ -0,0 +1,22 @@
+<?php
+
+namespace Smashballoon\Customizer\Tabs;
+
+/** @internal */
+abstract class Tab
+{
+    protected $id;
+    protected $heading;
+    public function get_sections()
+    {
+        return [];
+    }
+    public function get_id()
+    {
+        return $this->id;
+    }
+    public function get_heading()
+    {
+        return $this->heading;
+    }
+}