Dependencies

Direct dependencies declared in Cargo.toml (commit 2250bb0). Versions reflect the entry in Cargo.toml at the time of the snapshot — the resolved versions are pinned in Cargo.lock.

Runtime dependencies

Crate	Version pin	Why fd needs it
clap	4.6.0 (with suggestions, color, wrap_help, cargo, derive)	Command-line parsing. The whole Opts struct in src/cli.rs is a clap derive.
clap_complete	4.6.0, optional via the completions feature	Backs --gen-completions for bash/zsh/fish/PowerShell.
aho-corasick	1.1	Fast multi-pattern matcher used by FormatTemplate::parse to recognise placeholder literals ({}, {/}, {//}, {.}, {/.}, {{, }}).
nu-ansi-term	0.50	ANSI color/style application for printed paths. Pairs with lscolors.
argmax	0.4.0	argmax::Command wrapper that tracks accumulated argv bytes so --exec-batch flushes before exceeding ARG_MAX.
ignore	0.4.25	Parallel directory walker that honours .gitignore/.ignore/.fdignore. The same crate ripgrep uses.
regex	1.12.2	Pattern matching against file basenames or full paths via regex::bytes::Regex.
regex-syntax	0.8	Parses patterns into Hir for smart-case detection (regex_helper.rs).
ctrlc	3.5	Cross-platform Ctrl-C handler installed in WorkerState::scan.
globset	0.4	Translates --glob patterns into regular expressions.
anyhow	1.0	Top-level error type, used as Result<...> everywhere.
etcetera	0.11	Locates the platform-appropriate config directory for the global fdignore file.
normpath	1.1.1	Path normalisation, especially for Windows path components.
crossbeam-channel	0.5.15	Bounded MPMC channel between sender threads and the receiver(s).
faccess	0.2.4	Used by FileTypes::should_ignore to detect executability for -t executable.
jiff	0.2.18	Date and duration parsing for --changed-within / --changed-before. Replaced humantime and chrono in 10.3.0.
lscolors	0.21 (default features off, nu-ansi-term feature on)	Parses LS_COLORS and styles paths.
nix	0.31.1 (Unix only, default features off, signal/user/hostname)	UID/GID lookups for OwnerFilter, signal handling for the SIGINT re-raise, hostname for OSC 8 hyperlinks.
libc	0.2 (Unix without Redox)	Direct libc bindings used by the Unix metadata path-handling.
tikv-jemallocator	0.6.0 (optional, gated on a long target-cfg list)	Selected as #[global_allocator] on most Unix targets for performance.

Dev dependencies

Listed in [dev-dependencies] and only present when running tests:

Crate	Version pin	Use
diff	0.1	Pretty-print diffs in tests/testenv/mod.rs when integration tests fail.
tempfile	3.27	The TempDir API used by TestEnv to build per-test directory trees.
filetime	0.2	Set precise mtimes on test fixtures for --changed-within / --changed-before.
test-case	3.3	Parameterised test attribute used by some unit tests.

Cargo features

Feature	Effect
use-jemalloc	Pulls in tikv-jemallocator and enables it as the global allocator (when the target is supported).
completions	Pulls in clap_complete and enables --gen-completions.
base	use-jemalloc only — used for "base" builds without completion generation.
default	use-jemalloc + completions.

Build profile changes

Cargo.toml customises three profiles:

Profile	Settings
dev	debug = "line-tables-only". Crates are built with debug = false to keep build times short.
release	lto = true, strip = true, codegen-units = 1. Optimised, slow-to-build, small binary.
debugging	inherits dev with debug = true for full backtraces during debugging.

Notable absences

• No async runtime (tokio, async-std, etc.). fd uses native threads via std::thread::scope.
• No serialization crate (serde, etc.). Configuration is entirely CLI-driven.
• No logging framework (log, tracing, etc.). Errors go through a single print_error helper. See debugging.
• No HTTP/network libraries. fd is a strictly local tool.

Why not roll our own?

fd's value proposition is "simple, fast, user-friendly". Most of the heavy lifting is delegated to focused crates the maintainers trust:

• ignore already encodes years of git's nuances around ignore semantics.
• argmax already knows the per-platform ARG_MAX quirks.
• lscolors already handles every wrinkle of the LS_COLORS mini-language.
• jiff already handles calendar arithmetic correctly.

The maintainer pattern, visible in the commit history and the CHANGELOG, is to lean into a well-maintained dependency rather than re-implementing it.