Corey Roth [MVP]

If you are trying out your Ionic / Cordova apps on iOS 11 with Xcode 9, you might run into an issue where the app terminates immediately.  After examining the logs, you will see that the plugin cordova-plugin-firebase is terminating the app because it cannot find the GoogleService-Info.plist file (even though it is there).   You’ll see an error like the following in your logs.

The GOOGLE_APP_ID either in the plist file 'GoogleService-Info.plist' or the one set in the customized options is invalid. If you are using the plist file, use the iOS version of bundle identifier to download the file, and do not manually edit the GOOGLE_APP_ID. You may change your app's bundle identifier to '(null)'. Or you can download a new configuration file that matches your bundle identifier from https://console.firebase.google.com/ and replace the current one.

*** Terminating app due to uncaught exception 'com.firebase.core', reason: 'Configuration fails. It may be caused by an invalid GOOGLE_APP_ID in GoogleService-Info.plist or set in the customized options.'

If this happens to you, check your version of the plugin.  On one machine, I had 0.2.4 and on the other I had 0.2.1.  It worked on 0.2.4 so removing the plugin and re-adding it fixed it for me on the affected machine.