The ICommandSender interface is used the base of each Entity and also some other types in CraftTweaker.
Each IEntity and IPlayer implements this!

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.command.ICommandSender;

ZenGetter	返回值类型
ZenGetter displayName	返回值类型 string
ZenGetter position	返回值类型 IBlockPos
ZenGetter world	返回值类型 IWorld
ZenGetter server	返回值类型 IServer

Takes a String Returns void (nothing).

ZenScript
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sender.sendMessage(String text);

Takes an ITextComponent Returns void (nothing).

ZenScript
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sender.sendRichTextMessage(ITextComponent textComponent);