The documentation states >=8.0.0, so I’d start around there. Usually the LTS version (current 12) is also a good bet.
w/r/t to node-sass you can sometimes resolve problems there by switching to sass (the reference implementation in Dart). It’s fairly straightforward unless you’ve got some major customization to you build process: Remove node-sass from your dependencies and add sass–they use compatible APIs. Sometimes you need to change the implementation value in your sass-loader definition to make sure Webpack knows which one to use. IME Dart SASS has been a lot easier to work with (way fewer problems w/ npm install).