Access Transformer

Access Transformers must be created in META-INF/accesstransformer.cfg, in the usual mappings of the mod loader:

  • Forge 1.16.x and earlier: MCP class names and SRG
  • Forge 1.17.x and later: Mojang class names and SRG
  • NeoForge: Mojang mappings

(Basically keep your ATs from Forge/NeoForge, don't remap them)

You may also refer to the Forge Documentation on this topic if you are new to this.