1 files changed, 9 insertions, 0 deletions
diff --git a/actionpack/lib/action_view/railtie.rb b/actionpack/lib/action_view/railtie.rb
index e8ea15f47c..d453f30882 100644
--- a/actionpack/lib/action_view/railtie.rb
+++ b/actionpack/lib/action_view/railtie.rb
@@ -6,6 +6,9 @@ module ActionView
   class Railtie < Rails::Railtie
     config.action_view = ActiveSupport::OrderedOptions.new
 
+    # setup default js includes
+    config.action_view.javascript_expansions = { :defaults => ['prototype', 'effects', 'dragdrop', 'controls', 'rails'] }
+
     require "action_view/railties/log_subscriber"
     log_subscriber :action_view, ActionView::Railties::LogSubscriber.new
 
@@ -17,6 +20,12 @@ module ActionView
       end
     end
 
+    initializer "action_view.javascript_expansions" do |app|
+      ActiveSupport.on_load(:action_view) do
+        ActionView::Helpers::AssetTagHelper.register_javascript_expansion(app.config.action_view.javascript_expansions)
+      end
+    end
+
     initializer "action_view.set_configs" do |app|
       ActiveSupport.on_load(:action_view) do
         app.config.action_view.each do |k,v|