Add a PHP routing file and deprecate the XML file

Resources/config/routing/routing-sf4.xml

@@ -3,9 +3,5 @@
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://symfony.com/schema/routing http://symfony.com/schema/routing/routing-1.0.xsd">
 
-    <route id="fos_js_routing_js" path="/js/routing.{_format}" methods="GET">
-        <default key="_controller">fos_js_routing.controller::indexAction</default>
-        <default key="_format">js</default>
-        <requirement key="_format">js|json</requirement>
-    </route>
+    <import resource="routing.php" type="php" />
 </routes>

Resources/config/routing/routing.php

@@ -0,0 +1,32 @@
+<?php
+
+/*
+ * This file is part of the FOSJsRoutingBundle package.
+ *
+ * (c) FriendsOfSymfony <http://friendsofsymfony.github.com/>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+use Symfony\Component\Routing\Loader\Configurator\RoutingConfigurator;
+use Symfony\Component\Routing\Loader\XmlFileLoader;
+
+return function (RoutingConfigurator $routes): void {
+    foreach (debug_backtrace(\DEBUG_BACKTRACE_PROVIDE_OBJECT) as $trace) {
+        if (isset($trace['object']) && $trace['object'] instanceof XmlFileLoader && 'doImport' === $trace['function']) {
+            if (__DIR__ === dirname(realpath($trace['args'][3]))) {
+                trigger_deprecation('friendsofsymfony/jsrouting-bundle', '3.6', 'The "routing-sf4.xml" routing configuration file is deprecated, import "routing.php" instead.');
+
+                break;
+            }
+        }
+    }
+
+    $routes->add('fos_js_routing_js', '/js/routing.{_format}')
+        ->methods(['GET'])
+        ->controller('fos_js_routing.controller::indexAction')
+        ->requirements(['_format' => 'js|json'])
+        ->defaults(['_format' => 'js'])
+    ;
+};

Resources/doc/installation.rst

@@ -43,7 +43,7 @@ Load the bundle's routing definition in the application:
 .. code-block:: yaml
 
     fos_js_routing:
-        resource: "@FOSJsRoutingBundle/Resources/config/routing/routing-sf4.xml"
+        resource: "@FOSJsRoutingBundle/Resources/config/routing/routing.php"
 
 Step 4: Publish the Assets
 --------------------------

composer.json

@@ -17,9 +17,10 @@
     ],
     "require": {
         "php": "^8.0",
+        "symfony/console": "^5.4|^6.0|^7.0",
+        "symfony/deprecation-contracts": "^2.1|^3.0",
         "symfony/framework-bundle": "^5.4|^6.0|^7.0",
         "symfony/serializer": "^5.4|^6.0.1|^7.0",
-        "symfony/console": "^5.4|^6.0|^7.0",
         "willdurand/jsonp-callback-validator": "~1.1|^2.0"
     },
     "require-dev": {