Babel vs ClojureScript

Babel is a JavaScript compiler that converts modern syntax into code compatible with current and older browsers or other environments. Its transformation pipeline is built from plugins, which users can combine into presets or write themselves. Babel provides transformers for the latest JavaScript and a React preset for JSX. It can also add features through third-party polyfills such as core-js, run codemods, and remove Flow or TypeScript type annotations; it does not check types. Source maps support debugging compiled output. The command-line interface can compile files or directories, watch for changes, and generate source maps. Installation documentation covers npm, Yarn, pnpm, and Bun. A standalone build can run in browsers and other non-Node.js environments, including on scripts marked text/babel or text/jsx, but the documentation recommends ahead-of-time transpilation with a Node.js build system for production. Babel is free, MIT-licensed, community-funded, and maintained by volunteers. The project directs support questions to GitHub Discussions, Slack, Stack Overflow, or Bluesky.

ClojureScript is a compiler that turns Clojure code into JavaScript for client and embedded application development wherever JavaScript reaches. It brings Clojure data structures and constructs—including functional programming, macros, destructuring, and polymorphism—into JavaScript environments. Its output is compatible with Google Closure Compiler advanced compilation, which can minify output and eliminate dead code. REPL support enables interactive development and testing in a browser or Node.js; the quick start uses browser output by default and selects Node.js output with a target setting. ClojureScript supports both ClojureScript and JavaScript dependencies, with React demonstrated in the quick start. Listed build tools include shadow-cljs, Figwheel, Leiningen, and lein-cljsbuild. Editor resources cover Cursive, Emacs, VS Code, Light Table, Sublime Text, Vim, and Atom. Documentation includes compiler and REPL options, dependencies, advanced compilation, source maps, and JavaScript module support marked Alpha. The project is open source under the Eclipse Public License 1.0 and lists Linux, macOS, Windows, web, and self-hosted environments.