How do I use Next.js 13 with NPM workspaces?

Question

My package.json is:

{
  "name": "mysterian",
  "version": "0.1.0",
  "private": true,
  "workspaces": [
    "packages/common",
    "packages/webapp"
  ]
}

In packages/webapp/src/app/api/auth/[...nextauth]/route.ts, I have:

import { FirestoreService } from "common/firestore";

My packages/common/index.ts has

export * from './firestore';

and packages/common/firestore.ts has:

import * as firebase from 'firebase-admin';
import { resolve, join } from 'path';
import { DataSource, Document } from 'common/types/db';

const absolutePath = resolve(join(__dirname, 'credentials', 'firebase_service_credentials.json'));
console.log({ absolutePath })
firebase.initializeApp({
  credential: firebase.credential.cert(require(absolutePath))
});

my absolutePath however has: ../packages/webapp/.next/server/app/api/auth/[...nextauth]/credentials/firebase_service_credentials.json'

Where it doesn't exist. What am I doing wrong?