This mod is based off of the Miniaturization Crafting mechanic from Compact Machines pre-1.13. It's still a work in progress, but most of the major features are in place and operational. Here is a summary:
All the recipes are loaded from the data/<container>/recipes folder, the same as any other datapack-driven recipe. See the wiki for some examples, or click here for a full example file.
Previously, the crafting mechanic forced a designer to be incredibly explicit about how recipe layers were defined. Given that this means a lot more work on a designer rather than letting the mod itself "figure it out," it meant that custom recipes felt like a second-class citizen to the mod. In Compact Crafting, this system was overhauled to make layer definitions more streamlined.
Take a look at the wiki's Recipe Layer Specification to see more information.
To be added in a future release. Allows for better automation of the miniaturization field.