Underscores community project contributors announced today that the theme now includes support for Sass. The popular WordPress starter theme is an open source project maintained by Automattic, and many of its users requested Sass support, according to contributor Tammie Lister. “The community firstly asked for Sass. As Sass is in core, this makes sense. It was already part of most themers’ workflow.”
If you visit Underscores.me and click on “Advanced Options”, you’ll now find that you can check a box to add Sass support.