Welcome. My name is Jeremiah John, sf/f author & activist.I tell liberationist stories.. . . More About Me
It can be hard to tell why a mixin fails in a sass file. After all, if the mixin isn't included in your dependencies automatically as it was before, grepping for it in the files won't turn up anything.
I was using a child theme of Classy, running Drupal 8. It turns out that this particular generically-named mixin comes from susy 2.x, having been removed in susy 3.x.
I fixed this by setting the susy version number like so in package.json:
"susy": "<3.0.0"
Then I ran:
npm install susy
I just completed a dystopian science fiction novel. I run a website which I created that connects farms with churches, mosques, and synagogues to buy fresh vegetables directly and distribute them on a sliding scale to those in need.
In 2003, I spent six months in prison for civil disobedience while working to close the School of the Americas, converting to Christianity, as one does, while I was in the clink.