balena‑sync is a low‑level Node.js library that watches a local project folder and streams file changes to a Balena‑powered device in real time. It provides a `sync` function for different device targets (remote or local Balena OS devices) and a Capitano‑compatible command wrapper for integration into the Balena CLI, and is intended for developers building tooling around Balena deployments rather than end‑users.