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.MCPotionEffect

MCPotionEffect implements the following interfaces. That means any method available to them can also be used on this class.

• crafttweaker.api.brackets.CommandStringDisplayable

Returns boolean

ZenScript
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myMCPotionEffect.isReady(duration as int, amplifier as int);

Returns crafttweaker.api.potion.MCPotionEffectInstance

ZenScript
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myMCPotionEffect.newInstance(duration as int, amplifier as int);