sass-rs is used at run time in 9 crates (of which 4 optionally). It's used at build time in 2 crates.

Depender (with downloads and own rev deps) sass-rs version
mber ^0.2.2
mkbook build ^0.2
web-bundler ^0.2
sitegen ^0.2
unveil-rs ^0.2.2
webapp-frontend build ^0.2.2
salmon ^0.2.2
cobalt-bin optional ^0.2
hyper-static-server optional ^0.2.2
wasm-run optional ^0.2.2
2 xtask-wasm optional ^0.2.2