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Example of integration of Rails, React, and Redux using React on Rails, based on Webpack, Babel, CSS Modules, Redux, React-Router, and much more. See this live here at reactrails.com.
Webpack Loader for Twitter Bootstrap, supporting both versions 3 and 4.
ShakaCode's Ruby style guide.
This loader will @import your SASS resources into every required SASS module. So you can use your shared variables & mixins across all SASS styles without manually importing them in each file. Made to work with CSS Modules!
ShakaCode on Github