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Item modification

This page is still under construction! Please yell at ChiefArug for publishing it too early.

Item modification is a startup event.

ItemEvents.modification is a startup script event used to modify various properties of existing items.

ItemEvents.modification(event => {
  event.modify('minecraft:ender_pearl', item => {
    item.maxStackSize = 64
    item.fireResistant = true
    item.rarity = "UNCOMMON"
  })
  event.modify('minecraft:ancient_debris', item => {
    item.rarity = "RARE"
    item.burnTime = 16000
  })
  event.modify('minecraft:turtle_helmet', item => {
    item.rarity = "EPIC"
    item.maxDamage = 481
    item.craftingRemainder = Item.of('minecraft:scute').item
  })
})

Available properties:

Property Value Type Description
maxStackSize int Sets the maximum stack size for items. Default is 64 for most items.
maxDamage int Sets the maximum damage an item can take before it is broken.
craftingRemainder Item Sets the item left behind in the crafting grid when this item is used as a crafting ingredient (like milk buckets in the cake recipe). Most items do not have one.
fireResistant boolean If this item burns in fire and lava. Most items are false by default, but Ancient Debris and Netherite things are not.
rarity Rarity Sets the items rarity. This is mainly used for the name colour. COMMON by default. Nether Stars and Elytra are UNCOMMON, Golden Apples are RARE and Enchanted Golden Apples are EPIC. 
burnTime int Sets the burn time (in ticks) in a regular furnace for this item. Note that Smokers and Blast Furnaces burn fuel twice as fast. Coal is 1600.
foodProperties FoodProperties Sets the items food properties to the provided properties. Can be null to remove food properties.
foodProperties
Consumer<FoodBuilder>
 Sets the properties according to the consumer. See example below //TODO ADD LINK
digSpeed float Sets the items digging speed to the number provided. See table below for defaults.
tier
Consumer<MutableToolTier>
 Sets the itemstools tier according to the consumer. See example below //TODO ADD LINK
attackDamage double AddsSets anthe attack damage bonus. Ifof this is a tool-type item then you should modify the tier instead. Can be negative.item.
attackSpeed double AddsSets anthe attack speed bonus. Ifof this is a tool-type item then you should modify the tier instead. Can be negative.
armorProtection double Adds an

Sets the armor protection bonus.for Canthis beitem. negative.20 is a full armour bar.
armorToughness double Adds an armor toughness bonus. Can be negative.
armorKnockbackResistance
 double Add an armor knockback resistance bonus. Can be negative. 1 is full knockback resistance.

Tool defaults
Tierlevel maxDamage digSpeed attackDamage (this is a bonus,bonus modified by the tool type value, not the final value)enchantmentValue

Wood

0

59 2 0 15
Stone1 131 4 1 5
Iron2 250 6 2 14
Diamond3 1561 8 3 10
Gold0 32 12 0 22
Netherite4 2031 9 415
Armor defaults

All boxes with multiple values are formatted [head, chest, legs, feet]. Boxes with single values are the same for every piece.

Tier

maxDamage 

armourProtection

 armorToughness armorKnockbackResistance
Leather [65, 75, 80, 55] [1, 2, 3, 1] 0 0
Chain [195, 225, 240, 165]
[1, 4, 5, 2]
 0 0
Iron [195, 225, 240, 165]
[2, 5, 6, 2]
 0 0
Gold [91 ,105, 112, 77]
[1, 3, 5, 2]
 0 0
Diamond [429, 495, 528, 363]
[3, 6, 8, 3]
 2 0
Turtle (only has helmet) [325, nil, nil. nil]
[2, nil, nil, nil]
 0 0
Netherite [481, 555, 592, 407]
[3, 6, 8, 3]
 3 0.1
Elytra (not actually armor) [nil, 432, nil, nil] 0 0 0

Tier

OptionsKinda forbroken modifyingat tiersthe moment! https://github.com/KubeJS-Mods/KubeJS/issues/662. Use the non tier methods instead.

Tools
ItemEvents.modification(event => {
  event.modify('golden_sword', item => {
    item.tier = tier => {
        tier.speed = 12
        tier.attackDamageBonus = 10
        tier.repairIngredient = '#forge:storage_blocks/gold'
        tier.level = 3
    }
  })
  event.modify('wooden_sword', item => {
    item.tier = tier => {
        tier.enchantmentValue = 30
    }
  })
})
Property Value Type Description
uses int The maximum damage before this tool breaks. Identical to maxDamage.
speed float The digging speed of this tool.
attackDamageBonus float The bonus attack damage of this tool.
level int The mining level of this tool.
enchantmentValue int The enchanting power of this tool. The higher this is, the better the enchantments at an Enchanting Table are.
repairIngredient Ingredient The material used to repair this tool in an anvil.
Armor

Doesnt actually exist/work at the moment. Sorry.

Food

ItemEvents.modification(event => {
  event.modify('minecraft:diamond', item => {
    item.foodProperties = food => {
        food.hunger(2)
        food.saturation(3)
        food.fastToEat(true)
        food.eaten(e => e.player.tell('you ate')) // this is broken, use ItemEvents.foodEaten instead.
    }
  })

  event.modify('pumpkin_pie', item => {
    item.foodProperties = null
  })
})
MethodParametersDescription
hungerint hSets the hunger restored when this item is eaten
saturationfloat sSets the saturation mulitplier when this food is eaten. This is not the final value, it goes through some complicated maths first
meatboolean flag (optional, true by default)Sets if this item is considered meat. Meat can be fed to wolves to heal them.
alwaysEdible
boolean flag (optional, true by default)
If this item can be eaten even if your food bar is full. Chorus Fruit has this true by default.
fastToEat
boolean flag (optional, true by default)
If this item is fast to eat, like Dried Kelp.
effect
ResourceLocation mobEffectId, int duration, int amplifier, float probability
Adds an effect to the entity who eats this, like a Golden Apple
removeEffectMobEffect mobEffectRemoves the effect from the entity who eats this, like Honey Bottles (poison).
eaten
Consumer<FoodEatenEventJS> e
BROKEN! Use ItemEvents.foodEaten in server scripts instead.
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