If you're interested in CSS in JS you should check out css-modules [1] and its Webpack [2] or Browserify implementation [3].

You get scoped, modular, composable, requirable CSS without the burden of doing styles in JS.

[1] https://github.com/css-modules/css-modules

[2] https://github.com/webpack/css-loader

[3] https://github.com/css-modules/css-modulesify