This project uses the nice autoreload feature of demoit to provide an easy to setup dev environment for Vega files.
Install go (1.14 min) then demoit :
go get -u github.com/dgageot/demoit
Then install it :
cd $HOME/go/src/github.com/dgageot/demoit
go install -mod=vendor
Also ensure that $HOME/go/bin is in your path
demoit -dev .
go to http://localhost:8888/