This is a library mod that contains code that is used and required by both Xaero's Minimap and Xaero's World Map starting with versions 25.3.2 (minimap) and 1.40.2 (world map).
The map mods themselves along with detailed descriptions of what they do can be found here:
It is only necessary to install this mod on Forge on Minecraft versions 1.16.5 and 1.12.2. The map mods will not work without the library.
The library is already included in the map mods by default on newer Minecraft versions and on Fabric/Quilt, so you do not need to install it separately, which is why you won't find such files here.
Please read the "For Developers" section on the map mod pages.
