Импорт пакета

Link to импорт-пакета

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.
import crafttweaker.potions.IPotionType;

Getting an IPotionType object

Link to getting-an-ipotiontype-object

You can get such an object through the use of the PotionType Bracket handler

ZenScript
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<potiontype:minecraft:long_strength>;
ZenGetterТип
ZenGetter
Тип
ZenGetter
effects
Тип
List<IPotionEffect>

Imitate the PotionType Bracket Handler

Link to imitate-the-potiontype-bracket-handler

This method does the same as the PotionType Bracket Handler.

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//fromString(String potiontype);
IPotionType.fromString("minecraft:mundane");