无法为Flutter项目添加firebase_ui_auth包的版本冲突问题

问题 #

在Firebase项目中尝试使用firebase_ui_auth包实现认证功能，添加该包到pubspec.yaml后执行flutter pub get时出现版本冲突错误：

由于所有版本的firebase_ui_auth都依赖于SDK中的flutter_localizations，而后者依赖intl 0.18.0，因此所有版本的firebase_ui_auth都要求intl 0.18.0。但我的项目firat_bilgisayar_sistemleri同时依赖firebase_ui_auth ^1.1.15和intl ^0.17.0，导致版本解析失败。

已尝试执行flutter pub upgrade、flutter pub outdated、flutter pub upgrade --major-versions命令，问题仍未解决。

项目的pubspec.yaml内容如下：

name: firat_bilgisayar_sistemleri
description: A new Flutter project.
# The following line prevents the package from being accidentally published to
# pub.dev using `flutter pub publish`. This is preferred for private packages.
publish_to: 'none' # Remove this line if you wish to publish to pub.dev

# The following defines the version and build number for your application.
# A version number is three numbers separated by dots, like 1.2.43
# followed by an optional build number separated by a +.
# Both the version and the builder number may be overridden in flutter
# build by specifying --build-name and --build-number, respectively.
# In Android, build-name is used as versionName while build-number used as versionCode.
# Read more about Android versioning at https://developer.android.com/studio/publish/versioning
# In iOS, build-name is used as CFBundleShortVersionString while build-number is used as CFBundleVersion.
# Read more about iOS versioning at
# https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
# In Windows, build-name is used as the major, minor, and patch parts
# of the product and file versions while build-number is used as the build suffix.
version: 1.0.0+1

environment:
  sdk: '>=3.0.0-286.0.dev <4.0.0'

# Dependencies specify other packages that your package needs in order to work.
# To automatically upgrade your package dependencies to the latest versions
# consider running `flutter pub upgrade --major-versions`. Alternatively,
# dependencies can be manually updated by changing the version numbers below to
# the latest version available on pub.dev. To see which dependencies have newer
# versions available, run `flutter pub outdated`.
dependencies:
  flutter:
    sdk: flutter


  # The following adds the Cupertino Icons font to your application.
  # Use with the CupertinoIcons class for iOS style icons.
  cupertino_icons: ^1.0.2
  provider: ^6.0.5
  carousel_slider: ^4.2.1
  line_icons: ^2.0.1
  form_validator: ^2.1.1

  
  #Core
  equatable: ^2.0.5

  flutter_riverpod: ^2.3.2
  
  kartal: ^2.8.0


  #Firebase
  cloud_firestore: ^4.4.3

  firebase_core: ^2.7.0

  firebase_auth: ^4.2.9

  firebase_ui_auth: ^1.1.15
  

  #Utility
  animated_text_kit: ^4.2.2
  intl: ^0.17.0

dev_dependencies:
  flutter_test:
    sdk: flutter
  
  
# very_good_analysis: ^4.0.0+1
# 
# The "flutter_lints" package below contains a set of recommended lints to
# encourage good coding practices. The lint set provided by the package is
# activated in the `analysis_options.yaml` file located at the root of your
# package. See that file for information about deactivating specific lint
# rules and activating additional ones.
# flutter_lints: ^2.0.0
# 
# For information on the generic Dart part of this file, see the
# following page: https://dart.dev/tools/pub/pubspec
# 
# The following section is specific to Flutter packages.
flutter:

  # The following line ensures that the Material Icons font is
  # included with your application, so that you can use the icons in
  # the material Icons class.
  uses-material-design: true

  # To add assets to your application, add an assets section, like this:
  assets:
      - assets/images/
      - assets/images/slider/

  # An image asset can refer to one or more resolution-specific "variants", see
  # https://flutter.dev/assets-and-images/#resolution-aware

  # For details regarding adding assets from package dependencies, see
  # https://flutter.dev/assets-and-images/#from-packages

  # To add custom fonts to your application, add a fonts section here,
  # in this "flutter" section. Each entry in this list should have a
  # "family" key with the font family name, and a "fonts" key with a
  # list giving the asset and other descriptors for the font. For
  # example:
  # fonts:
  #   - family: Schyler
  #     fonts:
  #       - asset: fonts/Schyler-Regular.ttf
  #       - asset: fonts/Schyler-Italic.ttf
  #         style: italic
  #   - family: Trajan Pro
  #     fonts:
  #       - asset: fonts/TrajanPro.ttf
  #       - asset: fonts/TrajanPro_Bold.ttf
  #         weight: 700
  #
  # For details regarding fonts from package dependencies,
  # see https://flutter.dev/custom-fonts/#from-packages

解决方案 #

这个问题的核心是版本依赖冲突：firebase_ui_auth强制要求intl版本至少为0.18.0，但项目指定了intl ^0.17.0。直接修改pubspec.yaml中的intl版本即可解决：

1. 打开项目的pubspec.yaml文件，找到dependencies下的intl配置项，将版本从^0.17.0修改为^0.18.0（或更高兼容版本）：

#Utility
animated_text_kit: ^4.2.2
intl: ^0.18.0

2. 保存文件后，在终端执行：

flutter pub get

这样就能解决版本解析失败的问题，因为intl 0.18.0完全兼容项目环境（SDK >=3.0.0），同时满足firebase_ui_auth的依赖要求。

内容的提问来源于stack exchange，提问作者Furkan Yildiz