Nested calls doesn't return the value

[lucasfloriani]

When I use one function inside another the font size doesn't return properly:

font-size: ${size(prop('fontSize'))};

But when I use only one of the functions the return is correct:

font-size: ${({ fontSize }) => key(['sizes', fontSize])};

This is the intended way to use the lib or its some kind of bug? I analyzed the return from prop function and see that is a function, can this be the problem that can't be used in nested calls?

[Keemluvr]

I had the same problem.
for those who have the same, it is possible to get the theme by props:

font-size: ${({ fontSize, theme }) => theme[pathToVariable] )};