The following steps are only required if you are using React Native 0.59 or earlier or need to manually integrate the library.

Add the RNFBCrashlytics Pod to your projects /ios/Podfile:

target 'app' do
  # Add the RNFBCrashlytics podspec to your app target:
  pod 'RNFBCrashlytics', :path => '../node_modules/@react-native-firebase/crashlytics'
end

You may need to update your local Pods repository in order for the Pods to be installed in your project:

$ cd ios/
$ pod install --repo-update

Once the Pods have installed locally, rebuild your iOS project:

npx react-native run-ios