Flutter Environment Config

A powerful Flutter plugin that provides type-safe access to environment variables with automatic code generation. Bring some 12 factor love to your Flutter apps! 🚀

Inspired by react-native-config

✨ Features

• 🔧 Type-Safe Code Generation: Automatically generates type-safe getters for environment variables
• 📱 Multi-Platform: Access variables in Dart, iOS (Swift/Objective-C), and Android (Kotlin/Java)
• � Multiple Environments: Support for dev, staging, prod configurations
• 🧪 Testing Support: Mock values for testing environments
• ⚡ Zero Configuration: Works out of the box with intelligent defaults

📦 Installation

Add to your pubspec.yaml:

dependencies:
  flutter_environment_config: ^1.0.2

🚀 Usage

1. Create Environment Files

Create environment files in the env/ folder:

my_app/
├── env/
│   ├── .env.develop     # Development environment
│   ├── .env.staging     # Staging environment
│   └── .env.production  # Production environment
└── pubspec.yaml

Example env/.env.develop:

API_URL=https://dev-api.myapp.com
API_KEY=dev-key-123
ENABLE_ANALYTICS=false
DEBUG_MODE=true
MAX_RETRIES=3
TIMEOUT_SECONDS=30.5

Example env/.env.staging:

API_URL=https://staging-api.myapp.com
API_KEY=staging-key-789
ENABLE_ANALYTICS=true
DEBUG_MODE=false
MAX_RETRIES=4
TIMEOUT_SECONDS=45.0

Example env/.env.production:

API_URL=https://api.myapp.com
API_KEY=prod-key-456
ENABLE_ANALYTICS=true
DEBUG_MODE=false
MAX_RETRIES=5
TIMEOUT_SECONDS=60.0

2. Load Environment Variables

import 'package:flutter_environment_config/flutter_environment_config.dart';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  
  // Load environment variables
  await FlutterEnvironmentConfig.loadEnvVariables();
  
  runApp(MyApp());
}

3. Use in Your App

class ApiService {
  void makeRequest() {
    // Direct access
    final apiUrl = FlutterEnvironmentConfig.get('API_URL');
    final apiKey = FlutterEnvironmentConfig.get('API_KEY');
    
    // Type conversion helpers
    final maxRetries = FlutterEnvironmentConfig.getInt('MAX_RETRIES', defaultValue: 3);
    final enableAnalytics = FlutterEnvironmentConfig.getBool('ENABLE_ANALYTICS', defaultValue: false);
    
    print('API URL: $apiUrl');
    print('Max retries: $maxRetries');
  }
}

📱 Native Configuration

For accessing environment variables in native Android and iOS code:

📚 Platform-Specific Setup Guides:

• 📱 Android Setup Guide - Gradle configuration, build flavors, ProGuard setup
• 🍎 iOS Setup Guide - Xcode schemes, Info.plist, Swift/Objective-C usage

⚙️ Code Generator

Generate type-safe getters for your environment variables:

dart run flutter_environment_config:generate

This creates lib/generated/flutter_environment_config.g.dart with type-safe access:

// Auto-generated - DO NOT MODIFY
abstract class FlutterEnvironmentConfigGeneration {
  // Type-safe getters
  static String? get apiUrl => FlutterEnvironmentConfig.get('API_URL');
  static String? get apiKey => FlutterEnvironmentConfig.get('API_KEY');
  static bool? get enableAnalytics {
    final value = FlutterEnvironmentConfig.get('ENABLE_ANALYTICS');
    return value?.toLowerCase() == 'true';
  }
  static int? get maxRetries {
    final value = FlutterEnvironmentConfig.get('MAX_RETRIES');
    return value != null ? int.tryParse(value) : null;
  }
  
  // Constant keys
  static const String kApiUrlKey = 'API_URL';
  static const String kApiKeyKey = 'API_KEY';
}

Usage with Generated Code:

import 'lib/generated/flutter_environment_config.g.dart';

class ApiService {
  void makeRequest() {
    final apiUrl = FlutterEnvironmentConfigGeneration.apiUrl;
    final maxRetries = FlutterEnvironmentConfigGeneration.maxRetries ?? 3;
  }
}

Generator Configuration

Customize output directory in pubspec.yaml:

flutter_environment_config:
  output_dir: lib/environment  # Default: lib/generated

🧪 Testing

Mock environment variables for testing:

import 'package:flutter_environment_config/flutter_environment_config.dart';

void main() {
  setUp(() {
    FlutterEnvironmentConfig.loadValueForTesting({
      'API_URL': 'https://test-api.com',
      'DEBUG_MODE': 'true',
      'MAX_RETRIES': '1',
    });
  });

  test('should use test environment variables', () {
    final apiUrl = FlutterEnvironmentConfig.get('API_URL');
    expect(apiUrl, equals('https://test-api.com'));
  });
}

⚠️ Security Notice

Environment variables are embedded in your app bundle and can be reverse-engineered. Never store sensitive data in .env files.

❌ Never store:

• API secrets and private keys
• Database credentials
• Signing certificates

✅ Safe to store:

• API endpoints and URLs
• Feature flags
• Debug settings

🤝 Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

📄 License

This project is licensed under the MIT License - see the LICENSE file for details.

🙏 Acknowledgments

• Inspired by react-native-config
• Built with ❤️ for the Flutter community