ShardTree is used at run time in 5 crates (of which 2 optionally). It is a direct run-time dependency in 2 crates. It's used only as a dev dependency in 1 crate.

Depender (with downloads and own rev deps) ShardTree version
950 4 zcash_client_backend ^0.5
240 zcash_client_sqlite ^0.5
250 1 pczt dev ^0.5