For the current version to work you need vue 3.
Currently, I develop without node and build chain. All is in the browser. Maybe I change this later but so far it is really quick and lightweight and I do not need to worry about node version, dependencies and whatnot.
To install the few dependencies (vue3 as well as mocha and chai for the tests) just run the downloadDependencies.sh (or take a look at the 4 lines of curl and download them yourself, if you do not want to run said bash script).
Run any http server (e.g. python -m http.server ). The code uses ES6 modules, which need a server.