ClojureScript is a Lisp-based compiler and runtime that translates Clojure source code into JavaScript. It enables functional programming across different JavaScript engines and platforms, allowing developers to build user interfaces and applications for web browsers and server environments.
The project provides a read-eval-print loop for executing code live within a browser or server for immediate feedback. This facilitates an interactive development workflow where code can be written and tested in real time without restarting the application.
The system covers a broad capability surface, including JavaScript interoperability, multi-runtime targeting, and the integration of external module systems and package managers. It also includes tooling for source mapping, build analysis caching, and production size optimization.