No visible error is shown on iOS Bridgeless when there is an error before AppRegistry.registerComponent

[jbroma]

Description

When bridgeless is enabled on iOS and there is a problem happening before AppRegistry.registerComponent is called, the simulator should display an error message. Instead, a blank screen is shown and there is no error in the console. See attached screenshot for more context.

Remarks:

• Issue reproduced by simply commenting out AppRegistry.registerComponent in index.js
• Works as expected on Android

Steps to reproduce

1. Install deps with yarn install
2. Install pods (with new arch enabled):

   bundle install
   cd ios
   RCT_NEW_ARCH_ENABLED=1 bundle exec pod install

3. Build & run the app through yarn ios
4. Observe:
   • no error log in console
   • blank screen instead of error screen

React Native Version

0.74.1

Affected Platforms

Runtime - iOS

Areas

Bridgeless - The New Initialization Flow

Output of npx react-native info

System:
  OS: macOS 14.5
  CPU: (10) arm64 Apple M1 Pro
  Memory: 135.03 MB / 32.00 GB
  Shell:
    version: "5.9"
    path: /bin/zsh
Binaries:
  Node:
    version: 20.12.2
    path: ~/Library/Caches/fnm_multishells/82159_1715689347220/bin/node
  Yarn:
    version: 3.6.4
    path: ~/Library/Caches/fnm_multishells/82159_1715689347220/bin/yarn
  npm:
    version: 10.5.0
    path: ~/Library/Caches/fnm_multishells/82159_1715689347220/bin/npm
  Watchman:
    version: 2023.09.25.00
    path: /opt/homebrew/bin/watchman
Managers:
  CocoaPods:
    version: 1.14.2
    path: /Users/jbroma/.rbenv/shims/pod
SDKs:
  iOS SDK:
    Platforms:
      - DriverKit 23.4
      - iOS 17.4
      - macOS 14.4
      - tvOS 17.4
      - visionOS 1.1
      - watchOS 10.4
  Android SDK: Not Found
IDEs:
  Android Studio: 2023.1 AI-231.9392.1.2311.11255304
  Xcode:
    version: 15.3/15E204a
    path: /usr/bin/xcodebuild
Languages:
  Java:
    version: 17.0.9
    path: /Users/jbroma/.jenv/shims/javac
  Ruby:
    version: 2.7.6
    path: /Users/jbroma/.rbenv/shims/ruby
npmPackages:
  "@react-native-community/cli": Not Found
  react:
    installed: 18.2.0
    wanted: 18.2.0
  react-native:
    installed: 0.74.1
    wanted: 0.74.1
  react-native-macos: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: true
  newArchEnabled: false
iOS:
  hermesEnabled: true
  newArchEnabled: true

Stacktrace or Logs

n/a

Reproducer

https://github.com/jbroma/bridgeless-app-registry-invariant

Screenshots and Videos

With bridgeless enabled:

With bridgeless disabled:

[imWildCat]

seeing the same issue.

I can get some error output via the console of Xcode