Support needed for ios build creation setup with ionic 5

Our ionic developer needs some support to setup the ios build creation using ionic 5

He is experinecing various issues like :

pDelegate+FirebasePlugin.h:7:65: error:
cannot find protocol declaration for 'GIDSignInDelegate'
@interface AppDelegate (FirebasePlugin) <UIApplicationDelegate, GIDSignInDelegate, ASAuthorizationControllerDelegate, ...

Smart Diet Planner/Plugins/cordova-plugin-firebasex/FirebasePlugin.h:4:9: fatal error:
module 'FirebaseFirestore' not found
@import FirebaseFirestore;

We expect not only the support to resolve these errors but till the build creation actually happens. Our developer is experienced and fast learner so we do not expect it to be more than 1 day job