Written in straight Node 5.x ES6. Unlike the JS3 tree of Hotspot, this does not use Babel or any other transpilation, so many of those fancy ES6/ES7 features (module import/export, object spread operators, async/await keywords, etc.) do not exist. Sorry.
Install dependencies with npm i, then run the tool with node .. We'll
NPM-ify this eventually, maybe.
I definitely recommend node-inspector. Thank me later.
npm install -g node-inspector
node-debug .