Creating a NodeJS runnable single javascript file from Clojurescript

Question

Using Lumo and the files mentioned below I am able to run $ node main.js and presto! "Hello world!". This is great but there are drawbacks to using Lumo, and I would like to know if this is possible with the cljs.jar.

How can I create a single javascript file from clojurescript using the ClojureScript Compiler (cljs.jar) that can be ran by NodeJs.

core.cljs

(ns hello-world.core
  (:require [cljs.nodejs :as nodejs]))
(nodejs/enable-util-print!)
(defn -main [& args]
  (println "Hello world!"))
(set! *main-cli-fn* -main)

node.cljs

(require '[lumo.build.api :as b])
(b/build "src"
  {:main 'hello-world.core
   :output-to "main.js"
   :optimizations :advanced
   :target :nodejs})

The goal is to have a single file that is all inclusive with no import/require of external files.

Why do I want this? There are many websites that have developer challenges for creating and/or enhancing algorithms. The problem is that most of these sites do not all you to use clojure, nor clojurescript. But they do let you use javascript.

These sites usually allow you to use Java as well...so if there is a another way perhaps get an export of a "java" file, not a Class file, that would also work. I doubt thats possible but figured I'd ask.

What is not working in your current setup? Doesn't build with your node.cljs generate a single javascript file that can be run with node? — Piotrek Bzdyl
– Piotrek Bzdyl, Commented Nov 7, 2017 at 7:31
Oh, you are using lumo.build.api. I think you can do the same with cljs.build.api. — Piotrek Bzdyl
– Piotrek Bzdyl, Commented Nov 7, 2017 at 7:32
All my attempts to generate a single file that can be executed by NodeJs failed. They included import statements. The key is not to import anything, I would like to have an all inclusive file. I updated the post to clarify. — tkolleh
– tkolleh, Commented Nov 10, 2017 at 2:38

Hendrik Poernama · Accepted Answer · 2017-11-10 02:53:32Z

1

build.clj

(require 'cljs.build.api)
(cljs.build.api/build "src" {:output-to "main.js"
                             :main 'hello-world.core
                             :target :nodejs
                             :optimizations :advanced})

build command

  java -cp cljs.jar:src clojure.main build.clj

edited Nov 10, 2017 at 2:53

answered Nov 7, 2017 at 8:32

Hendrik Poernama

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4 Comments

tkolleh Over a year ago

From my testing this includes the google closure functions for imports. I've updated the comment with clarifications. I'd like to generate a single javascript file that contains all required libraries.

Hendrik Poernama Over a year ago

If you add :optimizations :advanced or :simple, it will bundle all deps into one file.

tkolleh Over a year ago

Thank you! IDK where I went astray but your solution worked. (require 'cljs.build.api) (cljs.build.api/build "src" {:main 'hello-world.core :output-to "main.js" :optimizations :advanced :target :nodejs})

tkolleh Over a year ago

I was focused on using lein run -m clojure.main node.clj I get

Caused by: java.io.FileNotFoundException: Could not locate cljs/build/api__init.class or cljs/build/api.clj on classpath.

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