Dependencies

A high-level view of the third-party Rust crates this workspace pulls in. The authoritative list is Cargo.toml (workspace dependencies) and Cargo.lock.

Foundational

Crate	Used for
serde, serde_json	Configuration, notebooks, JSON output formats.
clap	CLI argument parsing in ruff and ty.
rayon	Parallelism in the linter and formatter.
tokio, tower-lsp	The two LSP servers.
anyhow, thiserror	Error types.
tracing, tracing-subscriber	Structured logs.
bitflags	Compact rule flags, scope flags.
aho-corasick, bstr	String search; used by some rules and the noqa parser.
argfile	Support for @arguments.txt argument files.
clap_complete_command	Shell completion generation.
clearscreen	Watch-mode screen clearing.

File system / IO

Crate	Used for
ignore, globset	File discovery honoring .gitignore.
cachedir	Detection of OS cache directories (for .ruff_cache).
camino	UTF-8 paths used in ruff_db::system.
fs-err	Wrapper around std::fs with better error messages.

Parsing / formatting

Crate	Used for
bincode	Binary serialization (cache).
serde-toml, toml	TOML configuration parsing.
pulldown-cmark	Markdown processing in mdtest and docs.

Snapshot testing

Crate	Used for
insta	Snapshot tests.
assert_fs, assert_cmd	Filesystem-aware integration tests.
tempfile	Test temp dirs.

Benchmarking

Crate	Used for
criterion	Benchmark framework.
codspeed-criterion-compat	CodSpeed integration in CI.

ty-specific

Crate	Used for
salsa	Incremental computation framework that ty is built on.
dashmap, hashbrown	Concurrent hash maps in tracked queries.
rustc-hash, fxhash	Faster hashing in hot paths.

Forked / bundled

• ruff_annotate_snippets — fork of annotate-snippets-rs. Lives at crates/ruff_annotate_snippets.
• ruff_formatter — fork of rome_formatter. Lives at crates/ruff_formatter.
• ty_vendored — bundled typeshed stubs.

Renovate / Dependabot

The .github/renovate.json file controls automatic dependency updates. Patch and minor updates are auto-merged where possible; major updates need human review.

Lock file

Cargo.lock is committed (134 KB). Updates are reviewed PR-by-PR; the team is conservative about breaking dependency changes since they can ripple into rule behavior or performance characteristics.

See also

• The full list of workspace dependencies is in Cargo.toml under [workspace.dependencies].
• Per-crate dependencies are declared in each crate's Cargo.toml and reuse workspace = true.