Another important feature for a mobile social media application is the ability to send users notifications of important events, for example, when their post gets starred or a friend has uploaded a new post. Sending notifications can be done with Expo and requires you to add both server- and client-side code, as the notifications are sent from the server. The client needs to retrieve a local identifier for the users' device, which is called the Expo push code. This code is needed to identify which device belongs to the user and how a notification should be sent to either iOS or Android.
Testing notifications can only be done by using the Expo application on your mobile device. iOS and Android simulators cannot ...
