There is good amount of documentation on how to implement GTM (Google Tag Manager) on a native android or an iOS app but nothing for a React Native app. There are couple of resources on the web which gives you the steps in implementing Firebase and GTM on a React Native app but there are some catches which no one mentions. First, the reason behind implementing both Firebase and GTM is Firebase acts as a data layer by sending different inbuilt events and the custom ones we implement. On GTM, we can intercept these Firebase events and play with them. So let's go ahead and see how to implement Firebase + GTM on a React Native App. This guide will contain details related to Android app but the process is similar for an iOS build as well.
Step 1 (Optional if you already have a react native app)
Install react native sample app by running the below line to get things started. If you have not installed NodeJS, you need to do that before you run the below command on command line. Also, you need an Android emulator or the corresponding one for iOS to run the app.
npx react-native init MyTestApp