latest

Find the latest version of any command, package, or library. Scans project files automatically.

Quick Start

# Install
cargo install --path .

# Scan current project
cd my-rust-project
latest
# Scanning Cargo.toml...
# tokio: 1.48.0  ✓
# serde: 1.0.228  ✓

# Check specific packages
latest node go rust

Features

• 17 sources: System (path, brew, apt), Python (uv, pip, conda), JavaScript (npm), Rust (cargo), Go (go), Ruby (gem), Elixir (hex), Dart (pub), PHP (composer), JVM (maven), Docker (docker), .NET (nuget), Swift (swift)
• Project scanning: Auto-detects Cargo.toml, package.json, uv.lock, pyproject.toml, go.mod
• Ecosystem-aware: Compares versions within the same ecosystem (won't flag npm's go as newer than Go the language)
• Context-aware install hints: Suggests cargo add in a Cargo project, npm install (not -g) in a Node project
• Multiple output formats: Human-readable, JSON, quiet mode

Usage

latest                        # Scan project files in current directory
latest <package>              # Check specific package(s)
latest npm:express            # Query specific source with prefix
latest --all node             # Show all sources
latest -s cargo serde         # Query specific source (alternative syntax)
latest --json                 # JSON output for scripting
latest -q node                # Quiet: just version number

Output

Output	Meaning
pip: 0.6.0 (installed)	Up to date, shows source
npm: 24.0.0 → 25.2.1 available	Outdated
not installed (available: ...)	Not installed, with install hints
not found	Package doesn't exist in any source
⚠ Also found in: brew, npm	Package exists in multiple ecosystems

Exit Codes

Code	Meaning
0	All packages up to date
1	Package not found or not installed
2	Package outdated

Sources

Source	Type	Ecosystem	Description
path	local	System	Commands in $PATH
brew	registry	System	Homebrew packages
apt	registry	System	APT packages (Debian/Ubuntu)
npm	registry	Npm	npm registry
uv	local	Python	uv project-local packages
pip	local	Python	Locally installed pip packages
conda	registry	Python	Conda packages
go	registry	Go	Go module proxy
cargo	registry	Cargo	crates.io
gem	registry	Ruby	RubyGems
hex	registry	Beam	Hex.pm (Elixir/Erlang)
pub	registry	Dart	pub.dev
composer	registry	Php	Packagist (PHP)
maven	registry	Jvm	Maven Central
docker	registry	Container	Docker Hub
nuget	registry	Dotnet	NuGet (.NET)
swift	registry	Swift	Swift Package Index

Project Scanning

When run without arguments, latest scans for project files in this order:

File	Source	Language
Cargo.toml	cargo	Rust
package.json	npm	Node.js
uv.lock	pip	Python (uv)
pyproject.toml	pip	Python
go.mod	go	Go

Configuration

Create ~/.config/latest/config.toml to customize source precedence:

precedence = ["path", "brew", "apt", "npm", "uv", "pip", "conda", "go", "cargo", "gem", "hex", "pub", "composer", "maven", "docker", "nuget", "swift"]

Examples

# Check if project dependencies are current
latest

# Check a package (shows source and cross-ecosystem warnings)
latest latest
# pip: 0.6.0 (installed)
# ⚠ Also found in: brew, npm, cargo, gem

# Query a specific ecosystem with prefix syntax
latest npm:latest
# npm: 0.2.0

# JSON output for scripting
latest --json | jq '.[] | select(.status != "up_to_date")'

# Check all sources for a package
latest --all node
# path: 25.2.1 (installed)
# brew: 25.2.1
# npm: 24.12.0

# Quiet mode for scripts (version only, no source prefix)
latest -q -s npm express
# 5.2.1

Development

cargo build           # Build
cargo test            # Run tests
cargo run -- node     # Run directly
cargo bench           # Run benchmarks

Benchmarks

Benchmarks use Criterion for statistical analysis. Results and HTML reports are saved to target/criterion/.

cargo bench                              # Run all benchmarks
cargo bench -- version_comparison        # Run specific group

Property-Based Testing

Property tests use proptest for randomized input generation (works on stable Rust):

cargo test proptests                     # Run with default 256 cases
PROPTEST_CASES=10000 cargo test proptests # Run with more cases

License

MIT