fix(expo): declare AppCheckCore modular dependencies

[eliotgevers]

Summary

Fix Expo iOS prebuild failures with the current GoogleSignIn / AppCheckCore pod graph by declaring the pods that need modular headers from the Expo adapter podspec.

Why

Fresh Expo 56 installs with @react-native-google-signin/google-signin@16.1.2 can resolve GoogleSignIn 9.2.0 and AppCheckCore 11.3.0. In Expo's default static CocoaPods setup, CocoaPods then fails because AppCheckCore is a Swift pod that depends on GoogleUtilities and RecaptchaInterop, which do not define modules unless modular headers are enabled.

Expo autolinking already enables modular headers for direct dependencies of Expo modules with native code. The Expo adapter is this package's Swift Expo module, so declaring the specific AppCheckCore dependency pods there lets Expo apply its normal modular-header handling without requiring generated Podfile edits or an AppCheckCore version pin.

What Changed

Added these direct dependencies to ExpoAdapterGoogleSignIn.podspec so Expo marks them modular:

• GoogleUtilities/Environment
• GoogleUtilities/UserDefaults
• RecaptchaInterop

Validation

Created a fresh Expo 56 repro app:

npx create-expo-app@latest rngsi-expo56-repro --template blank-typescript --yes
cd rngsi-expo56-repro
npm install @react-native-google-signin/google-signin@16.1.2
npx expo prebuild --clean --platform ios

Baseline failed during pod install:

The Swift pod `AppCheckCore` depends upon `GoogleUtilities` and `RecaptchaInterop`,
which do not define modules.

After applying this patch:

rm -rf ios/Pods ios/Podfile.lock ios/build/DerivedData
npx expo prebuild --platform ios --no-install
cd ios && pod install --repo-update
xcodebuild -workspace rngsiexpo56repro.xcworkspace \
  -scheme rngsiexpo56repro \
  -configuration Debug \
  -sdk iphonesimulator \
  -destination 'platform=iOS Simulator,name=iPhone 17' \
  -derivedDataPath build/DerivedData \
  build

Results:

• pod install succeeds.
• xcodebuild succeeds.
• The resulting lockfile keeps GoogleSignIn 9.2.0, AppCheckCore 11.3.0, and RecaptchaInterop 101.0.0.

Closes #1517.

[vonovak]

Thanks; afaict this works for expo, but the community cli users will need to specify modular_headers for these pods.

[github-actions]

🎉 This PR is included in version 16.1.4 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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