CoreLib is a set of libraries developed by Limoka/Kremnev to make modding Core Keeper easier.
CoreLib can be found on mod.io here:
Source code for CoreLib (and all submodules) is public on GitHub:
To install CoreLib in your modding SDK, follow the directions in its readme. You can find out the latest version number to pin by looking at the most recent tag name.
When creating a mod that depends on CoreLib, make sure to list every module dependency and the root CoreLib mod as a direct dependency of your mod. The game's mod.io integration sucks at downloading dependencies correctly, let alone transitive dependencies, and doing this helps ensure it correctly downloads everything.