Is xss_clean still used in CodeIgniter 4?

I am attempting to migrate a CodeIgniter 2 system to the latest version 4 of the framework. However, I am facing an issue while executing the function $nomUsr = $ security-> xss_clean ($ this-> input-> post ('nomUsr')) in CI4, which is resulting in an error. Is there something missing that I need to load into another file or has xss_clean been removed in CodeIgniter 4? Thanks in advance!