safe method returning "Just undefined"

I’m just testing the library to see if it’s going to be useful to me. But I’ve came up with this output and I’m not sure if is correct. My guess is that the console.log from the code bellow supposed to be Nothing but is printing out Just undefined is that correct? how come?

import { safe, isNil } from 'crocks'
import { inc } from './utils'

const exercise3 = () => {
  const qs = { pageSize: 10, totalPages: 203 }	
  const page = safe(isNil, qs.page)
  console.log(page) //Just undefined
}

[evilsoft]

Well the not function takes a predicate function, not a value, so that compose would not have worked as expected. all of the logic functions take either a predicate a -> Boolean or a Pred datatype. You can consider them logic combinators in a way.

[wellyal]

Hope we pass your tests, if we do not, please let us know how we didn’t and we may be able to accommodate or explain why.

I am an elm enthusiastic and this repo is really similar. So I really liked what I’ve seen so far.