Phantom Loader is a library that automates part of the process of creating Minecraft mods for multiple mod loaders by generating loader-specific code at build time.
About
Normally, when creating a mod for both Fabric and Forge, mod developers have to create separate modules for both mod loaders and add loader-specific code that has mostly the same function. Phantom Loader allows you to automatically generate Forge and Fabric initializer classes on build time by keeping all code, or most of the code, in the common module.
The Phantom Library also takes care of abstracting each mod loader's basic functionalities to allow the developer to only depend on the abstraction from the common module.
For developers
Documentation for setting up and using Phantom Loader can be found on the Wiki.
An example mod using Phantom Loader can be found here.
Credits
Author: HexagonNico