Galactus is a small Node.js utility that programmatically removes unnecessary packages from a project’s `node_modules` tree—mirroring what `npm prune --production` does—but with a programmable API. It provides a `DestroyerOfModules` class that can walk the dependency graph, decide which modules to keep via a customizable test, and then delete the rest, making it useful for developers who need automated cleanup or custom pruning logic in build scripts or CI pipelines.