addon usage in 9.0.0

[miguelcobain]

It's not very clear what's the upgrade path for addons that use ember-cli-sass to provide sass styles for the consuming app.

Is it the addon's responsibility to provide a sass implementation?
Should we document and delegate that to the user?

I guess that ideally we would provide a default implementation that the user could override if needed.

[jrjohnson]

v8.0.1 which followed 9.0.0 now auto uses dart-sass https://github.com/aexmachina/ember-cli-sass/blob/master/index.js#L36 so I think my approach is going to be to put sass into my dependencies for my addon which will provide to to consuming apps and be available as the default.

I don't know if this is the best approach, but it's the only one I can think of 🤷‍♂️