A boilerplate project with hot swapping for testing things on Three.js
You need to install budo as a global package or even better use your favourite distribution package system to install it.
npm -g install budo
Then run the dev server with:
npm run dev
In case you are using ingnore-scripts=true in your .npmrc (as you should, scripts can be used as an attack vector), use the dev.sh bash script.