The **codeceptjs‑cmdhelper** package adds a helper for CodeceptJS that lets test scripts execute arbitrary shell commands (via Node’s `spawn`) directly from test code. It’s aimed at developers writing end‑to‑end tests who need to set up or clean up the environment (e.g., creating files, starting services) before or after test suites. Compatible with CodeceptJS 1‑3, it’s installed as a dev dependency and configured in the test runner’s helpers section.