How to access custom helper/function on storybook?

Question

js,

I want to ask how to access some custom function that I use on my components ?

Here my component Code : [see image here

Currently my component have 2 helper, and load from "../app/helpers"

Here my storiesbook for that component : see image here

And I got this error when running yarn storybook see image here

Please anyone can give me some advice for this problem ?

Thanks