Use of undeclared identifier 'FIRApp' - ios

Question

After import the Firebase.h file i wrote "[FIRApp configure]" on "- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions". While running on the simulator it is showing "Use of undeclared identifier 'FIRApp'". But if select "Generic iOS device" option for build, no error is coming. Build and Archive working as properly. But on local simulator issue is coming.I have to run the app on Simulator first for crash communications with Firebase server. Please give me solution.enter

Answer 1

In AppDelegate.m file, you should import firebase like #import <Firebase.h> before #ifdef FB_SONARKIT_ENABLED line.
As I understand, You probably get success on dev build because FlipperKit libraries are used for debugging and this #ifdef FB_SONARKIT_ENABLED if condition is satisfied. When you try to archive it will not be imported and the variables will be undeclared because #import <Firebase.h> remains in that if condition.

Answer 2

FIRApp is moved (or initially was) to FirebaseCore framework. So.
#import <FirebaseCore/FirebaseCore.h>.

Answer 3

As stated in this github comment:
What work for me
Just add
#import <Firebase.h> to the AppDelegate.h as well
Source:

Answer 4

I have a same problem but I haven't FB_SONARKIT_ENABLED
#import <React/RCTAppSetupUtils.h>
#if RCT_NEW_ARCH_ENABLED
#import <Firebase.h>
#import <FirebaseCore/FirebaseCore.h>
#import <React/CoreModulesPlugins.h>
#import <React/RCTCxxBridgeDelegate.h>
#import <React/RCTFabricSurfaceHostingProxyRootView.h>
#import <React/RCTSurfacePresenter.h>
#import <React/RCTSurfacePresenterBridgeAdapter.h>
#import <ReactCommon/RCTTurboModuleManager.h>
#import <react/config/ReactNativeConfig.h>
static NSString *const kRNConcurrentRoot = #"concurrentRoot";
#interface AppDelegate () <RCTCxxBridgeDelegate, RCTTurboModuleManagerDelegate> {
RCTTurboModuleManager *_turboModuleManager;
RCTSurfacePresenterBridgeAdapter *_bridgeAdapter;
std::shared_ptr<const facebook::react::ReactNativeConfig> _reactNativeConfig;
facebook::react::ContextContainer::Shared _contextContainer;
}
#end
#endif
#implementation AppDelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
[FIRApp configure];
RCTAppSetupPrepareApp(application);
enter image description here

Answer 5

In the react native firebase docs (see here: https://rnfirebase.io/) it says put the #import <Firebase.h> at the top of the document. You imported #import <Firebase.h> below #if RCT_NEW_ARCH_ENABLED, so you basically import firebase module if the RCT_NEW_ARCH_ENABLED condition is true.
you should do :
#import <Firebase.h>
#import <React/RCTAppSetupUtils.h>
#if RCT_NEW_ARCH_ENABLED
#import <FirebaseCore/FirebaseCore.h>
#import <React/CoreModulesPlugins.h>
#import <React/RCTCxxBridgeDelegate.h>
#import <React/RCTFabricSurfaceHostingProxyRootView.h>
#import <React/RCTSurfacePresenter.h>
#import <React/RCTSurfacePresenterBridgeAdapter.h>
#import <ReactCommon/RCTTurboModuleManager.h>
#import <react/config/ReactNativeConfig.h>