AppDelegate.m error while building: Use of undeclared identifier '_trustKitConfig'

[realtril]

Here's what I have in AppDelegate.m :

#import "AppDelegate.h"
#import <React/RCTBridge.h>
#import <React/RCTBundleURLProvider.h>
#import <React/RCTRootView.h>
#import <React/RCTLinkingManager.h>
#import <React/RCTConvert.h>
#import "RNSplashScreen.h"  // here
#import <TrustKit/TrustKit.h>
#import <TrustKit/TSKPinningValidator.h>
#import <TrustKit/TSKPinningValidatorCallback.h>

#if defined(FB_SONARKIT_ENABLED) && __has_include(<FlipperKit/FlipperClient.h>)
#import <FlipperKit/FlipperClient.h>
#import <FlipperKitLayoutPlugin/FlipperKitLayoutPlugin.h>
#import <FlipperKitUserDefaultsPlugin/FKUserDefaultsPlugin.h>
#import <FlipperKitNetworkPlugin/FlipperKitNetworkPlugin.h>
#import <SKIOSNetworkPlugin/SKIOSNetworkAdapter.h>
#import <FlipperKitReactPlugin/FlipperKitReactPlugin.h>


static void InitializeFlipper(UIApplication *application) {
  FlipperClient *client = [FlipperClient sharedClient];
  SKDescriptorMapper *layoutDescriptorMapper = [[SKDescriptorMapper alloc] initWithDefaults];
  [client addPlugin:[[FlipperKitLayoutPlugin alloc] initWithRootNode:application withDescriptorMapper:layoutDescriptorMapper]];
  [client addPlugin:[[FKUserDefaultsPlugin alloc] initWithSuiteName:nil]];
  [client addPlugin:[FlipperKitReactPlugin new]];
  [client addPlugin:[[FlipperKitNetworkPlugin alloc] initWithNetworkAdapter:[SKIOSNetworkAdapter new]]];
  [client start];
}
#endif

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    // Initialize TrustKit
    _trustKitConfig =
    @{
      // Do not auto-swizzle NSURLSession delegates
      kTSKSwizzleNetworkDelegates: @NO,
      kTSKPinnedDomains: @{
              // Pin invalid SPKI hashes to *.yahoo.com to demonstrate pinning failures
              @"www.google.com": @{
                      kTSKEnforcePinning: @YES,
                      kTSKIncludeSubdomains: @YES,
                      // Wrong SPKI hashes to demonstrate pinning failure
                      kTSKPublicKeyHashes: @[
                              @"2wWssssssqhqhqhhwqhwhqhwhqhwh=",
                              ],
                      },

              }};

    [TrustKit initSharedInstanceWithConfiguration:_trustKitConfig];

    // Demonstrate how to receive pin validation notifications (only useful for performance/metrics)

    return YES;
}
{
#if defined(FB_SONARKIT_ENABLED) && __has_include(<FlipperKit/FlipperClient.h>)
  InitializeFlipper(application);
#endif

  RCTBridge *bridge = [[RCTBridge alloc] initWithDelegate:self launchOptions:launchOptions];
  RCTRootView *rootView = [[RCTRootView alloc] initWithBridge:bridge moduleName:@"main" initialProperties:nil];
  id rootViewBackgroundColor = [[NSBundle mainBundle] objectForInfoDictionaryKey:@"RCTRootViewBackgroundColor"];
  if (rootViewBackgroundColor != nil) {
    rootView.backgroundColor = [RCTConvert UIColor:rootViewBackgroundColor];
  } else {
    rootView.backgroundColor = [UIColor whiteColor];
  }

  self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
  UIViewController *rootViewController = [UIViewController new];
  rootViewController.view = rootView;
  self.window.rootViewController = rootViewController;
  [self.window makeKeyAndVisible];

  [super application:application didFinishLaunchingWithOptions:launchOptions];
  [RNSplashScreen show];
  return YES;
 }

- (NSArray<id<RCTBridgeModule>> *)extraModulesForBridge:(RCTBridge *)bridge
{
  // If you'd like to export some custom RCTBridgeModules, add them here!
  return @[];
}