superb-warfare/src/main/resources/data/superbwarfare/recipes/javalin_smithing.json

{
  "type": "minecraft:smithing_transform",
  "template": {
    "item": "superbwarfare:javelin_blueprint"
  },
  "base": {
    "item": "superbwarfare:legendary_material_pack"
  },
  "addition": {
    "item": "superbwarfare:ancient_cpu"
  },
  "result": {
    "item": "superbwarfare:javelin"
  }
}