refactor(react_ujs) build UJS with webpack

Author: rmosolgo

.gitignore

@@ -5,6 +5,6 @@ test/dummy/tmp
 gemfiles/*.lock
 *.swp
 /vendor/react
-react-builds/node_modules
+**/node_modules
 react-builds/build
 coverage/

Rakefile

@@ -12,15 +12,20 @@ def copy_react_asset(webpack_file, destination_file)
   FileUtils.cp(full_webpack_path, full_destination_path)
 end
 
+# Move to `dirname` and execute `yarn {cmd}`
+def yarn_run_in(dirname, cmd)
+  Dir.chdir(dirname) do
+    `yarn #{cmd}`
+  end
+end
+
 namespace :react do
   desc "Run the JS build process to put files in the gem source"
   task update: [:install, :build, :copy]
 
   desc "Build the JS bundles with Webpack"
   task :build do
-    Dir.chdir("react-builds") do
-      `yarn run build`
-    end
+    yarn_run_in("react-builds", "build")
   end
 
   desc "Copy browser-ready JS files to the gem's asset paths"
@@ -39,9 +44,30 @@ namespace :react do
 
   desc "Install the JavaScript dependencies"
   task :install do
-    Dir.chdir("react-builds") do
-      `yarn install`
-    end
+    yarn_run_in("react-builds", "install")
+  end
+end
+
+namespace :ujs do
+  desc "Run the JS build process to put files in the gem source"
+  task update: [:install, :build, :copy]
+
+  desc "Install the JavaScript dependencies"
+  task :install do
+    yarn_run_in("react_ujs", "install")
+  end
+
+
+  desc "Build the JS bundles with Webpack"
+  task :build do
+    yarn_run_in("react_ujs", "build")
+  end
+
+  desc "Copy browser-ready JS files to the gem's asset paths"
+  task :copy do
+    full_webpack_path = File.expand_path("../react_ujs/dist/react_ujs.js", __FILE__)
+    full_destination_path = File.expand_path("../lib/assets/javascripts/react_ujs.js", __FILE__)
+    FileUtils.cp(full_webpack_path, full_destination_path)
   end
 end