Value of dat.gui can not be read

[TrumpsWigg]

I tried to follow the tutorial of Chris Courses ; https://www.youtube.com/watch?v=VNmTubIDZOY&t=599s, but I was not able to run dat.gui correctly. As soon as i enter to comand - import * as dat from 'dat.gui' - my sin curve on my browser disappears and vs code gives me the coment that; 'dat' is decleared but its value is never read. Can someone help me?