Yarn is a set of open, unencumbered Minecraft mappings, free for everyone to use under the Creative Commons Zero license. The intention is to let everyone mod Minecraft freely and openly, while also being able to innovate and process the mappings as they see fit.

The current version targets Minecraft version 18w49a.

Please remember that copying and pasting mappings from alternate projects under more restrictive licenses (such as MCP) is completely forbidden without explicit permission from the owners of said mappings. Discussing the naming approaches used in said projects is also not welcome - you have been warned. However, it is a good idea to consult name changes with other people - use pull requests or our community spaces to ask questions!

1. Fork and clone the repo
2. Run ./gradlew yarn (Linux, macOS) or gradlew yarn (Windows)
3. Profit

Yarn uses Gradle to provide a number of utility tasks for working with the mappings.

Downloads the client and server Minecraft jars for the current Minecraft version to .gradle/minecraft

Merges the client and server jars into one merged jar, located at VERSION-merged.jar in the mappings directory where VERSION is the current Minecraft version.

download and mergeJars

setupYarn and download and launch the latest version of Enigma automatically configured to use the merged jar and the mappings.