in lib/react/jsx/sprockets_strategy.rb [42:50]
def register_processors(sprockets_env)
sprockets_env.register_mime_type('application/jsx', extensions: ['.jsx', '.js.jsx', '.es.jsx', '.es6.jsx'])
sprockets_env.register_mime_type('application/jsx+coffee', extensions: ['.jsx.coffee', '.js.jsx.coffee'])
sprockets_env.register_transformer('application/jsx', 'application/javascript', React::JSX::Processor)
sprockets_env.register_transformer('application/jsx+coffee', 'application/jsx', Sprockets::CoffeeScriptProcessor)
sprockets_env.register_preprocessor('application/jsx', Sprockets::DirectiveProcessor.new(comments: ['//', ['/*', '*/']]))
sprockets_env.register_preprocessor('application/jsx+coffee', Sprockets::DirectiveProcessor.new(comments: ['#', ['###', '###']]))
end