Import extra javascript if available

themes/grav/templates/partials/javascript-config.html.twig

@@ -2,6 +2,7 @@
     window.GravAdmin = window.GravAdmin || {};
     window.GravAdmin.config = {
         base_url_relative: '{{ base_url_relative }}',
+        route: '{{ admin.route|trim('/') }}',
         param_sep: '{{ config.system.param_sep }}',
         enable_auto_updates_check: '{{ config.plugins.admin.enable_auto_updates_check }}',
         admin_timeout: '{{ config.plugins.admin.session.timeout ?: 1800 }}',

themes/grav/templates/partials/javascripts.html.twig

@@ -5,3 +5,5 @@
 {% if browser.getBrowser == 'msie' or browser.getBrowser == 'edge' %}
     {% do assets.addJs(theme_url~'/js/form-attr.polyfill.js') %}
 {% endif %}
+
+{% include 'partials/javascripts-extra.html.twig' ignore missing %}