Is it possible to compile ClojureScript without Java?
I read the clojurescript nodejs quickstart but I see they still use java to compile.
I checked cljs-bootstrap but they also depend on java.
Is there any way to just use npm install and start using clojurescript?
Now there is Lumo: https://www.npmjs.com/package/lumo-cljs
Lumo is a standalone ClojureScript environment that runs on Node.js and the V8 JavaScript engine. It starts up instantaneously and has out-of-the-box access to the entire Node.js ecosystem.
Lumo also provides a ClojureScript build API, making it possible to compile ClojureScript projects entirely without the JVM, thanks to the experimental JavaScript version of the Google Closure Compiler.
Cheers.
Until ClojureScript is self-hosted (implemented in ClojureScript rather than Clojure), Java is needed as well as Node/NPM. However, David Nolen said in his April 20, 2015 talk at Clojure West, relatively little work remains before the compiler can be bootstrapped in itself. [The talk may be interesting to watch for other reasons as well.] So this may change in the not-too-distant future.
As of ClojureScript 1.7 self compilation is now supported, see
To set up
(ns self-compile.core
(:require cljs.js))
(set! cljs.js/*eval-fn* cljs.js/js-eval)
(def state (cljs.js/empty-state))
(defn my-compiler [str-to-compile]
(cljs.js/eval-str state str-to-compile
(fn [response]
;evaluated code here
))
The initial compilation must be done on the JVM, however once this is done the function my-compiler above will compile strings. To create a sample project with up to date config use the lein mies template
lein new mies my-project
