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.entity.IEntityArrow;

IEntityArrow implement the following interfaces and are able to call all of their methods/getters/setters as well:

• IEntity
• IProjectile

ZenGetter	ZenSetter	类型
ZenGetter shooter	ZenSetter shooter	类型 IEntity
ZenGetter damage	ZenSetter damage	类型 double
ZenGetter knockbackStrength	ZenSetter knockbackStrength	类型 int
ZenGetter isCritical	ZenSetter isCritical	类型 布尔值
ZenGetter pickupStatus	ZenSetter pickupStatus	类型 字符串[string]
ZenGetter shake	ZenSetter ​	类型 int

• void shoot(IEntity shooter, float pitch, float yaw, float roll, float velocity, float inaccuracy)

• void setPickupDisallowed()

• void setPickupAllowed()

• void setPickupCreative()