Per-language toolchains

You only need a language's toolchain when generating projects in that language. Python alone needs no extra setup beyond pip install squeaky-clean.

Requirements by target_language

Language	Required toolchain	Used for
python	Python 3.10+ (already required for the framework)	pytest against generated tests
java	JDK 17+, Maven 3.8+	mvn -q test against generated Surefire suites
go	Go 1.21+	go build and go test against generated modules
rust	Rust 1.70+ (rustup)	cargo build and cargo test
javascript	Node 18+, npm	npm test against generated Jest suites
typescript	Node 18+, npm, plus tsc from the generated package.json	npm run build && npm test

The framework gracefully falls back to a zero-tests-pass result when a toolchain is unavailable rather than crashing the run. So you can ask for a Java project on a machine without a JDK — you just won't get a tests_pass score.

Verify

java -version
mvn -version
go version
rustc --version
node --version

Squeaky Clean's MavenTestRunner auto-resolves JAVA_HOME from /usr/lib/jvm/java-{11,17,21}-openjdk-* if the env var isn't set. On other distros, set it explicitly:

export JAVA_HOME=/path/to/jdk

What to do next

• Get started — generate your first project.
• Verify a run — read tests_pass and friends in the eval report.