sass-rs is used at run time in 8 crates (of which 3 optionally). It's used at build time in 2 crates.

Depender (with downloads and own rev deps) sass-rs version
mber ^0.2.2
salmon ^0.2.2
unveil-rs ^0.2.2
sitegen ^0.2
webapp-frontend build ^0.2.2
mkbook build ^0.2
web-bundler ^0.2
160 2 xtask-wasm optional ^0.2.2
wasm-run optional ^0.2.2
hyper-static-server optional ^0.2.2