SvelteKit /src/hooks.js with cookie + firebase-admin

hooks.js

import * as cookie from 'cookie';
import { firebase } from "$services/server/firebase";

const firestore = firebase.firestore();

export async function getContext({ headers }) {
  let user = null;
  try {
    const cookies = cookie.parse(headers.cookie || "");
    const sessionId = cookies["__session"];
    if (!sessionId) {
      return {
        context: { user }
      }
    };
    const sessDoc = firebase.firestore().collection(`sessions`).doc(sessionId);
    const session = (await sessDoc.get()).data();
    if (!session) {
      return {
        context: { user }
      }
    };
    user = JSON.parse(session.sess);
    const { uid } = user;
    const userSnap = await firestore
      .collection('users')
      .doc(uid)
      .get();
    const userData = userSnap.data();

    return {
      context: { user, userData }
    }
  } catch (e) {
    console.error('hooks.js', e);
    return {
      context: { user }
    }
  };
};

export async function getSession({ context }) {
  return context;
}