assets.rake in react_on_rails-12.0.0.pre.beta.2

- old
+ new
@@ -1,24 +1,39 @@
 # frozen_string_literal: true
 
+# Important: The default assets:precompile is modified ONLY if the rails/webpacker webpack config
+# does not exist!
+
 require "active_support"
 
-if Rake::Task.task_defined?("assets:precompile")
-  Rake::Task["assets:precompile"].enhance do
-    Rake::Task["react_on_rails:assets:webpack"].invoke
+ENV["RAILS_ENV"] ||= ENV["RACK_ENV"] || "development"
+ENV["NODE_ENV"]  ||= "development"
+webpacker_webpack_config_abs_path = File.join(Rails.root, "config/webpack/#{ENV["NODE_ENV"]}.js")
+webpack_config_path = Pathname.new(webpacker_webpack_config_abs_path).relative_path_from(Rails.root).to_s
+
+unless File.exists?(webpacker_webpack_config_abs_path)
+  if Rake::Task.task_defined?("assets:precompile")
+    Rake::Task["assets:precompile"].enhance do
+      Rake::Task["react_on_rails:assets:webpack"].invoke
+      puts "Invoking task wepacker:clean from React on Rails"
+      Rake::Task["webpacker:clean"].invoke
+    end
+  else
+    Rake::Task.define_task("assets:precompile" => ["react_on_rails:assets:webpack"])
   end
-else
-  Rake::Task.define_task("assets:precompile" => ["react_on_rails:assets:webpack"])
 end
 
 # Sprockets independent tasks
 namespace :react_on_rails do
   namespace :assets do
     desc <<-DESC.strip_heredoc
       Compile assets with webpack
       Uses command defined with ReactOnRails.configuration.build_production_command
 
       sh "#{ReactOnRails::Utils.prepend_cd_node_modules_directory('<ReactOnRails.configuration.build_production_command>')}"
+
+      Note: This command is not automatically added to assets:precompile if the rails/webpacker
+      configuration file #{webpack_config_path} exists.
     DESC
     task webpack: :locale do
       if ReactOnRails.configuration.build_production_command.present?
         sh ReactOnRails::Utils.prepend_cd_node_modules_directory(
           ReactOnRails.configuration.build_production_command