EnchantJS

Due to the extensive use of redirects, compatibility may be poor. Use it cautiously

Allows you to modify the maxlevel of the enchantment.
Allows you to modify the minlevel of the enchantment.
Allows you to modify whether the enchantment can be applied via an enchantment table.
Allows you to modify the items that can be enchanted with this enchantment.
Allows you to modify the enchantment category

Allows you to modify the enchantmentvalue of the item.
Allows you to modify whether the item is enchantable.

A Example Script (In startup_scripts)

EnchantJSEvent.modification(event=>{
  event.modify('minecraft:power',(enchant)=>{
    enchant.setRealMaxLevel(2)
  })

  event.modify("minecraft:infinity",(enchant)=>{
    enchant.setRealMaxLevel(2)
    enchant.setRealMinLevel(1)
    enchant.setCanApplyAtEnchantingTableFn(stack=>false)
    //enchant.setCanEnchantFn(i=>true)
    //enchant.setCategory(i=>true)
    enchant.setRarity("very_rare")
  })

  event.modify("minecraft:flame",enchant=>{
    enchant.setCategory(i=>true)
  })

  event.modify("minecraft:unbreaking",enchant=>{
    enchant.setCategory(i=>true)
  })
})


ItemEvents.modification(event=>{
  event.modify("stick",item=>{
    item.setRealIsEnchantable(stack=>true)
    item.setRealGetEnchantmentValueFn(stack=>{
      return 100
    })
  })
})