Dropbox dives into CoffeeScript

This post details Dropbox's migration of its entire browser-side codebase from JavaScript to CoffeeScript. It addresses concerns about development bloat by implementing server-side instrumentation for fast recompilation and debugging. The authors argue that CoffeeScript's syntactic improvements address historical issues in JavaScript, leading to a 21% reduction in lines of code and tokens. They also discuss the methodology, including the use of js2coffee for initial conversion and testing with Jasmine and Selenium. Future plans include source map support and native browser support for CoffeeScript.