A friendly heads up that RFC: Add a frontend build step to skins/extensions to our deploy process is up for discussion on 20th March, 2019 (announced here: https://lists.wikimedia.org/pipermail/wikitech-l/2019-March/091630.html). This WG's input would be incredibly helpful.
Topic on Talk:Wikimedia Release Engineering Team/CI Futures WG
Thanks! Planning to attend.