If you use NextAuth within your Next.js v12.x project, you've probably faced this issue:

Can't resolve module 'next/headers'

The only way I found it was by applying a patch-package to the Next Auth package. Let's fix it:

• Change your package.json:

// package.json
"scripts": {
    "postinstall": "patch-package"
}

Then execute:

yarn add -D patch-package postinstall-postinstall

After that change, you'll need to change two files inside your node_modules:

• node_modules/next-auth/next/index.js

• node_modules/next-auth/src/next/index.ts

Modify them one by one:

you need to look for "next/headers" and you'll notice two pieces using it.

// node_modules/next-auth/next/index.js
// node_modules/next-auth/src/next/index.ts

if (isRSC) {
     options = Object.assign({}, args[0], {
      providers: []
     });

    const {
    headers,
    cookies
    } = require("next/headers");

    req = {
      headers: Object.fromEntries(headers()),
      cookies: Object.fromEntries(cookies().getAll().map(c => [c.name, c.value]))
    };
    res = {
      getHeader() {},
      setCookie() {},
      setHeader() {}
    };
} else {
    req = args[0];
    res = args[1];
    options = Object.assign({}, args[2], {
        providers: []
    });
}

/*
* replace with else only
*/
    req = args[0];
    res = args[1];
    options = Object.assign({}, args[2], {
        providers: []
    });

// node_modules/next-auth/next/index.js
// node_modules/next-auth/src/next/index.ts

// remove this const { headers, cookies } = require("next/headers")
// from async function NextAuthRouteHandler(

cookies: Object.fromEntries(
    Array.from(req.cookies.entries())
        .map(([name, value]) => [name, value])
),
headers: req.headers, // you don't need this as Headers

After applying those changes, you must run:

yarn patch-package next-auth

This will create the patch file. You can also refer to this gist here.

That's it. Byte bye!

P.S.: Troubleshooting

rm -rf node_modules yarn.lock package-lock.json .next

yarn