Sage 9 + webpack

:blue_heart: thank you so much for working on this

I just rebased the sage-9 branch from master. Would you mind submitting a PR to sage-9 with the changes that you’ve made so far?

Would want to avoid anything custom such as https://github.com/ptrckvzn/sage/blob/d3982e7edb6adcd0ffd61cb86573933b4fee01d2/assets/styles/common/_variables.scss#L8-L12