node js 'function' is not beening exported even though it is

Question

I am writing an react-app where I need to fetch some data from another website.

const getUserData = (id, key, access_token, getWith) => {...} This functions fetches the data from the external source and is exported like this:

module.exports = {
    getUserData,
};

The function is then used in another file like this:

import {getUserData} from '../Logic/userLogic.js'

fetchData(){
const thenFunc = (arr, userType) => {
       let newUser = userType;
       arr.forEach(element => {
           newUser = merge(newUser, element)
       })
       return newUser
   }

getUserData(this.state.user.id_, ['display_name', 'profile_image_url'],this.state.user.access_token, 'id')
.then(arr => {
     this.setState({user: thenFunc(arr, this.state.user)});
    }
}

If I start the react-app everything works fine but if I want to build the website I get the error:

Attempted import error: 'getUserData' is not exported from '../Logic/userLogic.js'.