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.text.IStyle;

ZenGetter	ZenSetter	类型
ZenGetter parent	ZenSetter parent	类型 IStyle
ZenGetter bold	ZenSetter bold	类型 bool
ZenGetter italic	ZenSetter italic	类型 bool
ZenGetter underline	ZenSetter underline	类型 bool
ZenGetter strikethrough	ZenSetter strikethrough	类型 bool
ZenGetter obfuscated	ZenSetter obfuscated	类型 bool
ZenGetter 插入	ZenSetter 插入	类型 bool
ZenGetter color	ZenSetter color	类型 string

• IStyle createShallowCopy();

Creates a shallow copy of this style. Changes to this instance's values will not be reflected in the copy, but changes to the parent style's values WILL be reflected in both this instance and the copy, wherever either does not override a value.

• IStyle createDeepCopy();

Creates a deep copy of this style. No changes to this instance or its parent style will be reflected in the copy.