anchor.diff:  [source,clojure]
   ----
   (defproject hello-es6 "0.1.0-SNAPSHOT"
  -  :dependencies [[org.clojure/clojure "1.9.0-alpha13"]
  +  :dependencies [[org.clojure/clojure "1.9.0-alpha14"]
                    [org.clojure/clojurescript "1.9.NNN"]]
     :jvm-opts ^:replace ["-Xmx1g" "-server"])
   ----
  
positive.code: Let's write the JavaScript:
  
  ----
  mkdir -p src/js/hello.js
  ----
  
  JavaScript files do not declare namespaces, so the ClojureScript compiler will
  
negative.code: 
  Since JavaScript modules simply get compiled into Google Closure namespaces, all
  of the generic ClojureScript REPL features just work. For example, if you want
  automatic hot-loading of your ES6 source files just use https://github.com/bhauman/lein-figwheel[Figwheel].
  
  We'll demonstrate manual hot-loading with the standard Node.js REPL.
  
  