I haven't tried this approach with importmaps but other than puppeteer which is installed on the system, there isn't really any JS dependency within the Rails app. There is an issue on github discussing this https://github.com/Studiosity/grover/issues/149. What it could mean is that you may still have to have node/npm installed on the server   Eric Chua  , but it doesn't have to be a dependency directly within your application (you can install node/npm and puppeteer within the Dockerfile, but Rails can be unaware of it beyond that).