Deprecate finalizer configuration (it doesn't do anything)

Revert "Remove finalizer and configuration"

This reverts commit 9e7b4a3173788ea43b11e74a4d2f69a5f1565daa.

actionview/CHANGELOG.md

+*   ActionView::Template.finalize_compiled_template_methods is deprecated with
+    no replacement.
+
+*   config.action_view.finalize_compiled_template_methods is deprecated with
+    no replacement.
+
 *   Ensure unique DOM IDs for collection inputs with float values.
     Fixes #34974
 

actionview/lib/action_view/railtie.rb

@@ -6,10 +6,13 @@
 module ActionView
   # = Action View Railtie
   class Railtie < Rails::Engine # :nodoc:
+    NULL_OPTION = Object.new
+
     config.action_view = ActiveSupport::OrderedOptions.new
     config.action_view.embed_authenticity_token_in_remote_forms = nil
     config.action_view.debug_missing_translation = true
     config.action_view.default_enforce_utf8 = nil
+    config.action_view.finalize_compiled_template_methods = NULL_OPTION
 
     config.eager_load_namespaces << ActionView
 
@@ -45,6 +48,16 @@ class Railtie < Rails::Engine # :nodoc:
       end
     end
 
+    initializer "action_view.finalize_compiled_template_methods" do |app|
+      ActiveSupport.on_load(:action_view) do
+        option = app.config.action_view.delete(:finalize_compiled_template_methods)
+
+        if option != NULL_OPTION
+          ActiveSupport::Deprecation.warn "action_view.finalize_compiled_template_methods is deprecated and has no effect"
+        end
+      end
+    end
+
     initializer "action_view.logger" do
       ActiveSupport.on_load(:action_view) { self.logger ||= Rails.logger }
     end

actionview/lib/action_view/template.rb

@@ -2,6 +2,7 @@
 
 require "active_support/core_ext/object/try"
 require "active_support/core_ext/kernel/singleton_class"
+require "active_support/deprecation"
 require "thread"
 require "delegate"
 
@@ -10,6 +11,14 @@ module ActionView
   class Template
     extend ActiveSupport::Autoload
 
+    def self.finalize_compiled_template_methods
+      ActiveSupport::Deprecation.warn "ActionView::Template.finalize_compiled_template_methods is deprecated and has no effect"
+    end
+
+    def self.finalize_compiled_template_methods=(_)
+      ActiveSupport::Deprecation.warn "ActionView::Template.finalize_compiled_template_methods= is deprecated and has no effect"
+    end
+
     # === Encodings in ActionView::Template
     #
     # ActionView::Template is one of a few sources of potential

railties/test/application/configuration_test.rb

@@ -2092,6 +2092,27 @@ class ::DummySerializer < ActiveJob::Serializers::ObjectSerializer; end
       assert_equal true, ActionView::Helpers::FormTagHelper.default_enforce_utf8
     end
 
+    test "ActionView::Template.finalize_compiled_template_methods is true by default" do
+      app "test"
+      assert_deprecated do
+        ActionView::Template.finalize_compiled_template_methods
+      end
+    end
+
+    test "ActionView::Template.finalize_compiled_template_methods can be configured via config.action_view.finalize_compiled_template_methods" do
+      app_file "config/environments/test.rb", <<-RUBY
+      Rails.application.configure do
+        config.action_view.finalize_compiled_template_methods = false
+      end
+      RUBY
+
+      app "test"
+
+      assert_deprecated do
+        ActionView::Template.finalize_compiled_template_methods
+      end
+    end
+
     test "ActiveJob::Base.return_false_on_aborted_enqueue is true by default" do
       app "development"