Create update yarn task (#39314)

* Use app:binstub:yarn in Action Text install generator

actiontext/lib/generators/action_text/install/install_generator.rb

@@ -9,10 +9,10 @@ module ActionText
       source_root File.expand_path("templates", __dir__)
 
       def install_javascript_dependencies
-        rails_command "app:update:bin", inline: true
+        rails_command "app:binstub:yarn", inline: true
 
         say "Installing JavaScript dependencies", :green
-        run "yarn add #{js_dependencies.map { |name, version| "#{name}@#{version}" }.join(" ")}",
+        run "bin/yarn add #{js_dependencies.map { |name, version| "#{name}@#{version}" }.join(" ")}",
           abort_on_failure: true, capture: true
       end
 

railties/lib/rails/generators/rails/app/app_generator.rb

@@ -100,6 +100,16 @@ module Rails
       end
     end
 
+    def yarn_when_updating
+      return if File.exist?("bin/yarn")
+
+      template "bin/yarn" do |content|
+        "#{shebang}\n" + content
+      end
+
+      chmod "bin", 0755 & ~File.umask, verbose: false
+    end
+
     def config
       empty_directory "config"
 
@@ -314,6 +324,11 @@ module Rails
       end
       remove_task :update_bin_files
 
+      def update_bin_yarn
+        build(:yarn_when_updating)
+      end
+      remove_task :update_bin_yarn
+
       def update_active_storage
         unless skip_active_storage?
           rails_command "active_storage:update", inline: true

railties/lib/rails/tasks/framework.rake

@@ -59,4 +59,10 @@ namespace :app do
       Rails::AppUpdater.invoke_from_app_generator :display_upgrade_guide_info
     end
   end
+
+  namespace :binstub do
+    task :yarn do
+      Rails::AppUpdater.invoke_from_app_generator :update_bin_yarn
+    end
+  end
 end