Cross-platform framework quirks that affect store review

Cross-platform frameworks ship their own submission footguns. Flutter's version: 1.0.0+1 format in pubspec.yaml maps to both CFBundleShortVersionString and CFBundleVersion — a mismatch blocks TestFlight upload with an opaque error. Expo projects without a fully configured eas.json submit profile force manual submission through Transporter, and Capacitor/Ionic apps face heightened Guideline 4.2 (Minimum Functionality) scrutiny because Apple treats thin web wrappers as rejectable.

Configure eas.json fully before the first submission so credentials don't block launch day. For Flutter projects, verify the version line in pubspec.yaml uses major.minor.patch+buildNumber format. For Capacitor or Ionic projects, audit the app for substantial native-only functionality (offline mode, push, hardware APIs) to defend against Guideline 4.2.

{
  "submit": {
    "production": {
      "ios": { "appleId": "$APPLE_ID", "ascAppId": "$ASC_APP_ID", "appleTeamId": "$APPLE_TEAM_ID" },
      "android": { "serviceAccountKeyPath": "./play-service-account.json" }
    }
  }
}