Push notification configuration for a bare Expo app

pushNotifications.js

import Constants from 'expo-constants';
import * as Notifications from 'expo-notifications';

let experienceId = undefined;
// This was a little confusing for me from the docs
// Your experience ID is basically your Expo username followed by
// the slug for the app you need the tokens for.
if (!Constants.manifest) experienceId = '@username/slug';

// Another thing to note here is that the token is actually under
// the data key. This is different from the managed workflow where
// this method would directly return the token.
const token = await Notifications.getExpoPushTokenAsync({ experienceId });

// Basically a function that updates the token in your DB
await updatePushToken(userId, token.data);