I fixed the error: Cannot find module 'babel-preset-env'
but I am not sure if the fix is 100% right. Now I get: TypeError: Cannot read property 'mkdir' of undefined 5 | export default function(filename?: string): Promise<string> { 6 | return new Promise((resolve, reject) => { > 7 | temp.mkdir(filename, function(err, path) { I added node-temp in debian/tests/control Depends afetr jest, but that did not help (it would have errored on require('temp') anyway). I have then turned my attention at brushing up node-temp, see this message to the js-team list: https://alioth-lists.debian.net/pipermail/pkg-javascript-devel/2021-January/052152.html Paolo