CodeEffect

For Players

This modification doesn't provide any new gameplay features on its own. CodeEffect is a technical library that enables other mods to execute program code through the data-driven enchantment system.

For Developers

Registering your code:

CodeEffect.register(HOOK_ID, (world, level, context, user, pos) -> {
    // Your code here
});

or alternative option:

CodeEffect.register(HOOK_ID, this::stuff);
// ...
public void stuff(ServerWorld world, int level, EnchantmentEffectContext context, Entity user, Vec3d pos) {
    // Your code here
}

Using in data:

"effect": {
    "type": "code_effect:run_code",
    "hook": "HOOK_ID"
}

Complete enchantment example:
Modified sharpness that executes code every game tick

{
    "anvil_cost": 1,
    "description": {
        "translate": "enchantment.minecraft.sharpness"
    },
    "effects": {
        "minecraft:tick": [
            {
                "effect": {
                    "type": "code_effect:run_code",
                    "hook": "HOOK_ID"
                }
            }
        ]
    },
    "exclusive_set": "#minecraft:exclusive_set/damage",
    "max_cost": {
        "base": 21,
        "per_level_above_first": 11
    },
    "max_level": 5,
    "min_cost": {
        "base": 1,
        "per_level_above_first": 11
    },
    "primary_items": "#minecraft:enchantable/sword",
    "slots": [
        "mainhand"
    ],
    "supported_items": "#minecraft:enchantable/weapon",
    "weight": 10
}