Install node.js.
Install react via npm install react react-dom.
Install shadow-cljs via npm install --save-dev shadow-cljs and/or npm install -g shadow-cljs.
Run npx shadow-cljs clj-run ecological.build/build-assets nil "resources/assets" to build the asset resources directory.
Run npx shadow-cljs server to get a repl server, open a browser (to http://localhost:8020 by default) to activate the compilation, and then use nREPL to connect to it. Open http://localhost:9630/ and enable watch.
Can also run it with lein or deps but I haven't configured that here yet and you miss out on the shadow-server recompile watch. Might do it anyway to be able to use git-repo-versions of libraries.
In emacs: M-x cider-connect-cljs
hostname: localhost
socket: 3333
type: shadow
build: eco