Reverse a colormap in GRUtils.jl

How can I reverse a colormap in GRUtils?

I can’t grab

cmap = colormap("jet")

to flip it or something.

The documentation says the colormap values can be retrieved… but doesn’t say how, and the above line of code doesn’t output anything.

I’ve inspected the original code but I don’t understand it.

What package are you using?

using GRUtils

I’ll update my question and title for it, thanks for asking.