rust-coverage-check

Gate cargo-llvm-cov coverage by crate, with a separate threshold per crate.

Install

npm install --save-dev @intentee/rust-coverage-check

Use

Generate an llvm-cov JSON report from your Rust workspace, then run the checker against it.

cargo llvm-cov clean --workspace
cargo llvm-cov --workspace --no-report
cargo llvm-cov report --json --output-path target/llvm-cov.json
cargo llvm-cov report

npx rust-coverage-check target/llvm-cov.json \
  --workspace-root "$PWD" \
  --gated my_crate=99 \
  --gated another_crate=80

• <json-path> (positional, required) — path to the cargo llvm-cov JSON report.
• --workspace-root <path> (required) — your Cargo workspace root. Files outside this directory are ignored.
• --gated <crate>=<percent> (repeatable, optional) — gate a crate at its own minimum coverage percent (0–100). Lines, functions, and regions are all checked against the same per-crate threshold.

With no --gated flags the tool only prints the per-crate table and exits 0. With at least one --gated flag it prints the table, then exits 1 if any gated crate is below its threshold or is missing from the report.

Makefile integration

.PHONY: coverage
coverage: node_modules
	cargo llvm-cov clean --workspace
	cargo llvm-cov --workspace --no-report
	cargo llvm-cov report --json --output-path target/llvm-cov.json
	cargo llvm-cov report
	npx rust-coverage-check target/llvm-cov.json \
	  --workspace-root $(CURDIR) \
	  --gated my_crate=99 \
	  --gated another_crate=80

License

MIT.