It appears that closure-compiler-js has been discontinued in favor of the heavier closure-compiler-npm package.
closure-compiler-npm provides facilities that - based on OS and environment - may run either a Java, native or JS port of Google Closure Compiler. Whatever version is deemed best at the time of installation is downloaded and/or built. To keep domvm's dependency size minimal, this repo extracts the two core files needed to run the JS version: The jscomp.js compiler itself (3.2MB) and a lightly modified API shim found at closure-compiler-js.js (3kb).
This shaves 22MB and 1,800 files off domvm's node_modules in devDependencies bloat, see issue #95 :D