Bulwark tackles one of the most under-addressed problems in modern JavaScript development: the npm supply chain. With npm now hosting over three million packages and a steady drumbeat of malicious package incidents, the typical npm install is essentially a leap of faith. Bulwark wants to make that leap shorter.

The tool acts as a quarantine layer for your dependencies. Instead of letting packages execute install scripts and land directly in node_modules, Bulwark intercepts them, runs static analysis, and lets you diff what changed between versions before anything runs on your machine. The key technical commitment — zero runtime dependencies — is genuinely impressive for a Node.js tool. A supply-chain shield that itself pulls in 400 transitive dependencies would be deeply ironic, and the author clearly understood the assignment.

What makes this repo stand out from generic "audit" tools is the benchmarking discipline. The README claims validation against ten real-world supply chain attacks, including:

• XZ utils — the infamous backdoor from 2024
• Shai-Hulud — the npm worm that propagated through compromised maintainer accounts
• tj-actions — the GitHub Actions compromise
• Polyfill.io, Ledger, Solana, event-stream, node-ipc, Nx, and Ultralytics

Testing against historical attacks is the right way to build a defensive tool — it forces you to confront actual attacker techniques rather than theoretical ones.

Who benefits: Security-conscious JavaScript developers, DevSecOps engineers maintaining CI pipelines, and small teams without the budget for commercial SCA platforms like Snyk or Socket. It's also valuable reading for anyone studying supply chain attack patterns — the test fixtures alone are an education.

The repo is brand new and unstarred, but the framing is sharp and the problem is real. Worth a look before your next npm install.