This is a wrapper for Dart Sass that implements the compiler side of the Embedded Sass protocol. It's designed to be embedded in a host language, which then exposes an API for users to invoke Sass and define custom functions and importers.
Binary releases are available from the GitHub release page. We recommend that embedded hosts embed these release binaries in their packages, or use a post-install script to install a specific version of the embedded compiler to avoid version skew.
Disclaimer: this is not an official Google product.