feat(React::JSX): add JSX.transform_options

[rmosolgo]

I want the feature from #107 :)

Now you can say in application.rb:

config.react.jsx_transform_options = {harmony: true}

And you'll get es6 features in your .jsx assets. What do you think about this implementation?

• Take a config
• Assign it to a module variable
• Use that when rendering with React::JSX::Template

I had to change the requires in the dummy application.js so that the ES6 file wouldn't wreck other tests.

I've used it with a test component in my app and it works!

[zpao]

Let's make this slightly more flexible in case whitespace changes. It's pretty unlikely we'll eve add it before the colon but after is pretty reasonable (in fact, I may go get somebody to fix that because it's bothering me now :D).

[zpao]

Thanks for picking this up, I think it's a great thing to do. You should be able to remove that 2nd commit now that #137 is in (thanks for the help btw).

[zpao]

We could also consider documenting the stripTypes option for anybody who wants to give flow a shot. Maybe we should do ruby -> js conversion (options.strip_types -> stripTypes)?

[rmosolgo]

@zpao added :strip_types option. It's accepted Ruby-style strip_types and converted to stripTypes under the hood.

I found that stripTypes didn't work unless harmony: true. Is that a known thing? I didn't see any mention of it on https://github.com/facebook/react/blob/master/npm-react-tools/README.md. My local react-source is 0.12.0:

$ bundle show react-source
/Users/rmosolgo/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/react-source-0.12.0

[rmosolgo]

Oops, had to add a leading / for the tests to pass

[zpao]

Let's do it.