The underlying machinery of the NixOS module system, evalModules, is useful for more than just declaring Operating Systems. At Replit, we use it to [declare IDE plugins](https://github.com/replit/nixmodules) for language runtimes, code intelligence (LSP), runners, packagers, and debuggers. Learn how you can use evalModules for your own applications and how we use it to declare an IDE. During the hackday, let's adapt the IDE plugins to emacs, vim, or vscode!