[BUG]: Need option to generate only String constants without AssetGenImage

[houzixiashanxiedaima]

Is there an existing issue for this?

• I have searched the existing issues

Version

5.8.0

Command type

build_runner (Default)

What happened?

Description

Currently, FlutterGen always generates AssetGenImage types for image assets. In our project, we need to use only String constants for asset paths (like static const String imagesLogo = 'assets/images/logo.png') without the AssetGenImage wrapper class. This is particularly important for projects migrating from string-based asset references or maintaining compatibility with existing codebases.

Current Behavior

class Assets {
    static const AssetGenImage imagesLogo = AssetGenImage('assets/images/logo.png');
}

Desired Behavior

class Assets {
    static const String imagesLogo = 'assets/images/logo.png';
}

Relevant a pubspec.yaml.

#资源文件生成配置
flutter_gen:
  output: lib/generated/ # 输出目录
  line_length: 80 # 行长度，过长时会自动换行
  
  integrations:
    flutter_svg: false   # 禁用 svg 集成
    flare_flutter: false # 禁用 flare 集成
    rive: false         # 禁用 rive 集成
    lottie: false       # 禁用 lottie 集成
    
  assets:
    outputs:
      class_name: Assets
      style: camel-case  # 使用驼峰命名
      package_parameter_enabled: false  # 不生成包参数

flutter:
  generate: false
  uses-material-design: true
  assets:
    - images/
    - images/2.0x/
    - images/3.0x/
    - audios/
    - assets/

Relevant log output

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