Use global variable in wp_script_modules()

src/wp-includes/class-wp-script-modules.php

@@ -30,6 +30,31 @@ class WP_Script_Modules {
 	 */
 	private $enqueued_before_registered = array();
 
+	/**
+	 * Container for the main instance of the class.
+	 *
+	 * @since 6.5.0
+	 * @var WP_Script_Modules|null
+	 */
+	private static $instance = null;
+
+	/**
+	 * Utility method to retrieve the main instance of the class.
+	 *
+	 * The instance will be created if it does not exist yet.
+	 *
+	 * @since 6.5.0
+	 *
+	 * @return WP_Script_Modules The main instance.
+	 */
+	public static function get_instance(): WP_Script_Modules {
+		if ( null === self::$instance ) {
+			self::$instance = new self();
+		}
+
+		return self::$instance;
+	}
+
 	/**
 	 * Registers the script module if no script module with that script module
 	 * identifier has already been registered.

src/wp-includes/script-modules.php

@@ -19,12 +19,7 @@
  * @return WP_Script_Modules The main WP_Script_Modules instance.
  */
 function wp_script_modules(): WP_Script_Modules {
-	static $instance = null;
-	if ( is_null( $instance ) ) {
-		$instance = new WP_Script_Modules();
-		$instance->add_hooks();
-	}
-	return $instance;
+	return WP_Script_Modules::get_instance();
 }
 
 /**

src/wp-settings.php

@@ -378,6 +378,8 @@
 require ABSPATH . WPINC . '/script-modules.php';
 require ABSPATH . WPINC . '/interactivity-api.php';
 
+wp_script_modules()->add_hooks();
+
 $GLOBALS['wp_embed'] = new WP_Embed();
 
 /**