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

Importing the package

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 Return Type
displayName string
position IBlockPos
world IWorld
server IServer


Send Message

Takes a String. Returns void (nothing).

sender.sendMessage(String text);