Switch to the new Sprockets processor

Author: eugenijusr

lib/react/jsx.rb

@@ -1,4 +1,5 @@
 require 'execjs'
+require 'react/jsx/processor'
 require 'react/jsx/template'
 require 'react/jsx/jsx_transformer'
 require 'react/jsx/babel_transformer'

lib/react/jsx/processor.rb

@@ -0,0 +1,17 @@
+module React
+  module JSX
+    class Processor
+      def self.instance
+        @instance ||= new
+      end
+      
+      def self.call(input)
+        instance.call(input)
+      end
+
+      def call(input)
+        @output ||= JSX::transform(input[:data])
+      end
+    end
+  end
+end

lib/react/rails/engine.rb

@@ -3,7 +3,12 @@ module Rails
     class Engine < ::Rails::Engine
       initializer "react_rails.setup_engine", :group => :all do |app|
         sprockets_env = app.assets || Sprockets # Sprockets 3.x expects this in a different place
-        sprockets_env.register_engine(".jsx", React::JSX::Template)
+        if Gem::Version.new(Sprockets::VERSION) >= Gem::Version.new("3.0.0")
+          sprockets_env.register_mime_type("application/jsx", extensions: [".jsx", ".js.jsx"])
+          sprockets_env.register_transformer("application/jsx", "application/javascript", React::JSX::Processor)
+        else
+          sprockets_env.register_engine(".jsx", React::JSX::Template)
+        end
       end
     end
   end