chipmunkmod/src/main/resources/fabric.mod.json

{
  "id": "modid",
  "name": "Example Mod",
  "version": "1.0.0",
  "side": "universal",
  "initializer": "net.fabricmc.example.ExampleMod",
  "requires": {
    "fabric": "*"
  },
  "mixins": {
    "client": "modid.client.json",
    "common": "modid.common.json"
  }
}