chipmunkmod/src/main/resources/modid.mixins.json

{
  "required": true,
  "package": "net.fabricmc.example.mixin",
  "compatibilityLevel": "JAVA_8",
  "mixins": [
  ],
  "client": [
    "ExampleMixin"
  ],
  "injectors": {
    "defaultRequire": 1
  }
}