lib/active_admin/engine.rb in activeadmin-3.2.5 vs lib/active_admin/engine.rb in activeadmin-4.0.0.beta1

@@ -1,20 +1,33 @@
 # frozen_string_literal: true
 module ActiveAdmin
   class Engine < ::Rails::Engine
+    isolate_namespace ActiveAdmin
+
     # Set default values for app_path and load_paths before running initializers
     initializer "active_admin.load_app_path", before: :load_config_initializers do |app|
       ActiveAdmin::Application.setting :app_path, app.root
       ActiveAdmin::Application.setting :load_paths, [File.expand_path("app/admin", app.root)]
     end
 
     initializer "active_admin.precompile", group: :all do |app|
-      unless ActiveAdmin.application.use_webpacker
-        ActiveAdmin.application.stylesheets.each do |path, _|
-          app.config.assets.precompile << path
-        end
-        ActiveAdmin.application.javascripts.each do |path, _|
-          app.config.assets.precompile << path
+      if app.config.respond_to?(:assets)
+        app.config.assets.precompile += %w(active_admin.js active_admin.css active_admin_manifest.js)
+      end
+    end
+
+    initializer "active_admin.importmap", before: "importmap" do |app|
+      ActiveAdmin.importmap.draw(Engine.root.join("config", "importmap.rb"))
+      package_path = Engine.root.join("app/javascript")
+      if app.config.respond_to?(:assets)
+        app.config.assets.paths << package_path
+        app.config.assets.paths << Engine.root.join("vendor/javascript")
+      end
+
+      if app.config.importmap.sweep_cache
+        ActiveAdmin.importmap.cache_sweeper(watches: package_path)
+        ActiveSupport.on_load(:action_controller_base) do
+          before_action { ActiveAdmin.importmap.cache_sweeper.execute_if_updated }
         end
       end
     end
 
     initializer "active_admin.routes" do