This class was added by a mod with mod-id crafttweaker. So you need to have this mod installed if you want to use this feature.

It might be required for you to import the package if you encounter any issues (like casting an Array), so better be safe than sorry and add the import.

ZenScript
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crafttweaker.api.potion.MCPotionEffectInstance

ZenScript
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myMCPotionEffectInstance.addCurativeItem(stack as crafttweaker.api.item.IItemStack);

Returns boolean

ZenScript
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myMCPotionEffectInstance.combine(effect as crafttweaker.api.potion.MCPotionEffectInstance);

Returns List<crafttweaker.api.item.IItemStack>

ZenScript
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myMCPotionEffectInstance.getCurativeItems();

Returns boolean

ZenScript
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myMCPotionEffectInstance.isCurativeItem(stack as crafttweaker.api.item.IItemStack);

ZenScript
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myMCPotionEffectInstance.setCurativeItems(items as crafttweaker.api.item.IItemStack[]);