transformIETag.zs

val craftingItem = <immersiveengineering:tool>.transformNew(function(item){
    if(!item.hasTag){
        return item.withTag({Damage: 1});
    }
    val tag = item.tag;
    if(!(tag has "Damage")){
        return item.withTag(tag + {Damage: 1});
    }
    val newDamage = tag.Damage.asInt() + 1;
    if(damage > 250) {
        //Tool breaks, so returns nothing
        return null;
    }
    return item.updateTag(tag + {Damage: newDamage});
});