Node.js Engineering

Detect Node version, ESM/CommonJS mode, package manager, framework, test runner, runtime/deployment model, and repository error conventions.

Trace async failures through promise ownership and lifecycle rather than swallowing them. Validate external input at boundaries, clean up resources, preserve cancellation/shutdown behavior where relevant, and use safe filesystem/process APIs.

Read workflow.md for async/error propagation, streams/processes, module boundaries, lifecycle and verification.