React Proto aims to give developers and designers the tools necessary for creating clean, organized, and intentional code from the beginning of the development process. Defining your components, their hierarchy, and how they interact via state and props, can alleviate the need for refactoring, and unnecessary code as your application scales.
This is the perfect middle ground between a whiteboard with a bunch of rectangles and making a full blown design in figma or sketch, all with output directly to a fully populated file structure in a working directory. Love it.