`module-library` is a lightweight JavaScript utility that lets developers declare modules and their dependencies directly in code instead of separate build‑tool configuration files. It provides a simple API (`define`, `using`, `export`) to create, compose, and optionally expose modules as CommonJS exports, making dependency tracking explicit and enabling easier debugging, browser bundling, and future hot‑reloading. The library is aimed at Node‑ and browser‑based JavaScript projects that want a programmatic, build‑free way to manage module dependencies.