Add Enable ES7 Transforms With react-rails as a javascript til.

README.md

@@ -100,6 +100,7 @@ smart people at [Hashrocket](http://hashrocket.com/).
 
 - [Character Codes from Keyboard Listeners](javascript/character-codes-from-keyboard-listeners.md)
 - [Create An Array Containing 1 To N](javascript/create-an-array-containing-1-to-n.md)
+- [Enable ES7 Transforms With react-rails](javascript/enable-es7-transforms-with-react-rails.md)
 - [Splat Arguments To A Function](javascript/splat-arguments-to-a-function.md)
 - [Throttling A Function Call](javascript/throttling-a-function-call.md)
 - [Transforming ES6 and JSX With Babel 6](javascript/transforming-es6-and-jsx-with-babel-6.md)

javascript/enable-es7-transforms-with-react-rails.md

@@ -0,0 +1,14 @@
+# Enable ES7 Transforms With react-rails
+
+The [`react-rails`]() gem adds JSX and ES6 transforms to the asset pipeline.
+By using `.js.jsx` and `.es6.jsx` extensions with relevant files, the asset
+pipeline will know to make the appropriate transformation when compiling
+application assets. ES7 transforms are not enabled by default, but can be
+configured. Add the following to the `config/application.js`
+file to allow ES7's *class properties* syntax:
+
+```ruby
+config.react.jsx_transform_options = {
+  optional: ["es7.classProperties"]
+}
+```