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flutter-macos-duplicate-camera-plugin

Fix Flutter macOS build failure caused by duplicate camera plugins. Use when: (1) macOS build fails with "Ambiguous use of 'CameraMacosPlugin.register(with:)'" error, (2) Both camera_macos and camera_macos_plus are in pubspec.yaml, (3) Build worked before adding a new camera package. The plugins define the same class name causing Swift registration conflicts.

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divinevideo/divine-mobile
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Flutter macOS Duplicate Camera Plugin Fix

Problem

Flutter macOS builds fail when both camera_macos and camera_macos_plus packages are present in pubspec.yaml. Both packages define the same CameraMacosPlugin class, causing Swift registration ambiguity.

Context / Trigger Conditions

Error message:

Ambiguous use of 'CameraMacosPlugin.register(with:)'

Symptoms:

  • macOS build fails during Swift compilation
  • iOS build may still succeed (different plugin implementations)
  • Error occurs in the generated plugin registration code
  • May be accompanied by Xcode build system crashes or "stat cache file not found" errors

Common scenarios:

  • Project has camera_macos for basic camera support
  • Added camera_macos_plus for additional features
  • Transitive dependency pulled in duplicate plugin
  • Copied pubspec.yaml from another project with different camera requirements

Solution

  1. Identify the duplicates - Check pubspec.yaml for both packages:

    # Look for these:
camera_macos: ^0.0.9
camera_macos_plus: ^0.0.3

  2. Choose one to keep - camera_macos_plus is generally preferred as it's a more feature-complete fork of camera_macos

  3. Remove the duplicate from pubspec.yaml:

    # Keep only one:
camera_macos_plus: ^0.0.3  # macOS camera support

  4. Clean thoroughly - The Xcode build system may be in a corrupted state:

    flutter clean
rm -rf build/
rm -rf macos/Pods/
rm -f macos/Podfile.lock
rm -rf ~/Library/Developer/Xcode/DerivedData/Runner-*
flutter pub get

  5. Rebuild:

    flutter build macos

Verification

After the fix:

  • flutter build macos completes successfully
  • No "Ambiguous use" errors in build output
  • The macOS app launches and camera functionality works

Example

Before (broken):

dependencies:
  camera_macos_plus: ^0.0.3
  divine_camera:
    path: packages/divine_camera
  camera_macos: ^0.0.9  # DUPLICATE - causes conflict

After (fixed):

dependencies:
  camera_macos_plus: ^0.0.3  # macOS camera support (replaces camera_macos)
  divine_camera:
    path: packages/divine_camera
  # camera_macos removed

Notes

  • camera_macos_plus is a community fork with additional features
  • If you specifically need camera_macos instead, remove camera_macos_plus
  • Check transitive dependencies with flutter pub deps if duplicates reappear
  • The Xcode build system can get into corrupted states after this error; thorough cleaning (including DerivedData) may be required
  • This is specific to macOS - iOS uses different camera plugin implementations

References

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