What could be causing the Next.js error: WEBPACK_IMPORTED_MODULE function not being recognized?

I've hit a roadblock with an issue I can't seem to solve. I'm exporting a function that is supposed to provide the current authenticated user object, if available. I then use this user object to determine whether to add a navigation link. Despite multiple attempts to fix the reference, the error persists.

This is the function definition located at @/app/hooks/use-auth-user.ts

'use client';
import {
    fetchAuthSession,
    fetchUserAttributes,
    getCurrentUser,
} from 'aws-amplify/auth';
import { useEffect, useState } from 'react';

export default function UseAuthUser() {
    const [user, setUser] = useState<Record<string, any>>();

useEffect(() => {
    async function getUser() {
        const session = await fetchAuthSession();
        if (!session.tokens) {
            return;
        }

        const user = {
            ...(await getCurrentUser()),
            ...(await fetchUserAttributes()),
            isAdmin: false,
        };

        const groups = session.tokens.accessToken.payload['cognito:groups'];
        // @ts-ignore
        user.isAdmin = Boolean(groups && groups.includes('administrators'));
        setUser(user);
    }

    getUser();
}, []);

return user;
}

And here is where I am referencing it from, located at @/app/lib/menus.ts

import UseAuthUser from '@/app/hooks/use-auth-user';

export function getResourceMenu(): Menu {
const user = UseAuthUser();
let links: Menu = [
    { name: 'Privacy Policy', href: '/privacy' },
    { name: 'Terms & Conditions', href: '/terms-and-conditions' },
    { name: 'Member Portal', href: '/auth/login' },
];

if (user) {
    links.push({ name: 'Dashboard', href: '/dashboard' });
}

return links;
}

I have provided a screenshot of the error message below:

Error: (0 , _app_hooks_use_auth_user__WEBPACK_IMPORTED_MODULE_0__.default) is not a function

https://i.sstatic.net/VTAkvith.png

I would greatly appreciate any insights on where I might be making a mistake because clearly, there is one.

Answer №1

While attempting to troubleshoot the reported issue, I encountered a separate issue that needed to be resolved first. After addressing this secondary problem, the code was able to run smoothly without any errors, which potentially resolves the initial problem as well.

https://i.sstatic.net/pBUecXBf.png

The root cause of the issue lies in the fact that the use-auth-user hook is designated as a client-only module using the use client directive. This restricts its usage solely to client components.

However, in the menus.ts file, the getResourceMenu() function directly invokes UseAuthUser(), treating it as server-side code and causing a mismatch.

To overcome this issue, I refactored the code by moving the logic into a client component, where UseAuthUser is called within the client component and the result is passed to getResourceMenu instead of being directly invoked inside the function.

// src/components/MenuComponent.tsx
'use client';  // Indicate this is a client component
import React from 'react';
import UseAuthUser from '@/hooks/use-auth-user';
import { getResourceMenu } from '@/lib/menus';

const MenuComponent = () => {
    const user = UseAuthUser();  // Retrieve user on the client side
    const links = getResourceMenu(user);  // Provide user data to getResourceMenu

    return (
        <nav>
            {links.map((link, index) => (
                <a key={index} href={link.href}>
                    {link.name}
                </a>
            ))}
        </nav>
    );
};

export default MenuComponent;

Enhancements to getResourceMenu Function

Updated the function to accept user input and implement conditional rendering based on user presence.

export function getResourceMenu(user: any) {
    let links = [
        { name: 'Privacy Policy', href: '/privacy' },
        { name: 'Terms & Conditions', href: '/terms-and-conditions' },
    ];

    if (user) {
        links.push({ name: 'Dashboard', href: '/dashboard' });
    }

    return links;
}

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