# File lib/action_view/helpers/asset_tag_helpers/javascript_tag_helpers.rb, line 66
          def register_javascript_expansion(expansions)
            js_expansions = JavascriptIncludeTag.expansions
            expansions.each do |key, values|
              js_expansions[key] = (js_expansions[key] || []) | Array(values)
            end
          end