https://engineering.wework.com/adventures-in-static-typing-react-redux-flow-oh-my-284c5f74adac > One of the largest single-page apps at WeWork consists of roughly 140K lines of code. A myriad of React components connected with Redux (and Reflux, in some of the older, to-be-refactored parts), juggling data from various backend services, styled with different systems (CSS modules, Radium), sprinkled with dozens of utility libraries. > Managing a beast of such size is no small feat.