ghost_logger 1.1.0

Can be Unseen but always there. Stealing errors before they steal your users' experience. A flexible logging utility with optional crash reporting integration.

Ghost Logger

Can be Unseen but always there. Stealing errors before they steal your users' experience.

A lightweight, flexible logging utility with colors/emoji indicators and optional crash reporting integration.

Features

• 👻 Silent Operation - Works invisibly in the background
• 🚨 Automatic Reporting - Steals errors to prevent user impact
• 🎯 Multiple Log Levels - Debug, info, warning, and error categorization
• 😊 Emoji Indicators - Quick visual scanning of logs
• 🔌 Pluggable Crash Reporting - Implement CrashReporter interface for any service
• 🛠️ Multiple Output Mechanisms - Print or developer.log output
• 🧪 Fully Testable - Zero hard dependencies on crash services
• 📦 Zero Dependencies - Only depends on Flutter SDK
• 🌍 Multi-Platform - Works on iOS, Android, Web, macOS, Windows, Linux

Installation

Add ghost_logger to your pubspec.yaml:

dependencies:
  ghost_logger: ^1.0.0

Then run:

dart pub get

Quick Start

Basic Setup

Import and configure Ghost Logger at your app startup:

import 'package:ghost_logger/ghost_logger.dart';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();

  await GhostLogger.configure(
    isDebugMode: true, // defaults to Flutter's kDebugMode
    loggerType: LoggerType.console,
  );

  runApp(const MyApp());
}

Logging Messages

Log messages with different severity levels:

GhostLogger.log(
  message: 'Processing user data',
  level: LogLevel.debug,
  tag: 'DataManager',
);

GhostLogger.log(
  message: 'User logged in successfully',
  level: LogLevel.info,
  tag: 'Auth',
);

GhostLogger.log(
  message: 'Deprecated API usage detected',
  level: LogLevel.warning,
  tag: 'API',
);

GhostLogger.log(
  message: 'Network request failed',
  level: LogLevel.error,
  tag: 'Network',
  stackTrace: StackTrace.current,
);

Log Levels

Ghost Logger supports four severity levels, each with a unique emoji for quick identification:

Level	Emoji	Use Case
Debug	⚒️	Development information, variable values
Info	👉	General app events, user actions
Warning	⚠️	Potential issues, deprecations
Error	❌	Failures that need attention

Colored Terminal Output

Ghost Logger automatically colors your terminal logs based on severity level for better readability:

• 🎨 Debug - Gray text
• 🎨 Info - Cyan text
• 🎨 Warning - Yellow text
• 🎨 Error - Red text

Colors work in most modern terminals and IDEs like VS Code, Android Studio, and IntelliJ IDEA.

Output Mechanisms

Choose how Ghost Logger outputs messages using LoggerType:

Print (Default)

Uses Dart's print() function. Simple but may truncate very long messages.

await GhostLogger.configure(
  isDebugMode: true, // defaults to Flutter's kDebugMode
  loggerType: LoggerType.print,
);

Console

Uses dart:developer log with enhanced features including log levels but in some IDEs the coloring may not work properly.

await GhostLogger.configure(
  isDebugMode: true,
  loggerType: LoggerType.console,
);

Crash Reporting Integration

Ghost Logger becomes truly powerful when integrated with crash reporting services. It works with any service that implements the CrashReporter interface.

With Firebase Crashlytics

Implement the CrashReporter interface for your preferred service:

import 'package:ghost_logger/ghost_logger.dart';
import 'package:firebase_crashlytics/firebase_crashlytics.dart';

class FirebaseCrashReporter implements CrashReporter {
  @override
  Future<void> log(String message) async {
    await FirebaseCrashlytics.instance.log(message);
  }
  
  @override
  Future<void> recordError(
    dynamic exception,
    StackTrace? stackTrace, {
    String? reason,
  }) async {
    await FirebaseCrashlytics.instance.recordError(
      exception,
      stackTrace,
      reason: reason,
    );
  }
  
  @override
  Future<void> setCollectionEnabled(bool enabled) async {
    await FirebaseCrashlytics.instance
        .setCrashlyticsCollectionEnabled(enabled);
  }
}

// Configure with crash reporting
await GhostLogger.configure(
  isDebugMode: false,
  loggerType: LoggerType.console,
  crashReporter: FirebaseCrashReporter(),
  enableCrashReporting: true,
);

Now all errors are silently reported to Firebase Crashlytics while still appearing in your console during development.

Custom Crash Reporter

Implement the CrashReporter interface for custom services:

import 'package:ghost_logger/ghost_logger.dart';

class CustomCrashReporter implements CrashReporter {
  @override
  Future<void> log(String message) async {
    await sendToCrashService(message);
  }

  @override
  Future<void> recordError(
    dynamic exception,
    StackTrace? stackTrace, {
    String? reason,
  }) async {
    await sendErrorToCrashService(exception, stackTrace, reason);
  }

  @override
  Future<void> setCollectionEnabled(bool enabled) async {
    await configureCollection(enabled);
  }
}

await GhostLogger.configure(
  isDebugMode: false,
  crashReporter: CustomCrashReporter(),
  enableCrashReporting: true,
);

API Reference

GhostLogger.configure()

Initializes Ghost Logger with configuration options.

Parameters:

• isDebugMode Enable/disable console output (default: kDebugMode)
• loggerType: Output mechanism (default: LoggerType.print)
• crashReporter: Crash reporting implementation (optional)
• enableCrashReporting: Enable crash service reporting (default: false)

await GhostLogger.configure(
  isDebugMode: !kReleaseMode,
  loggerType: LoggerType.console,
  crashReporter: GhostFirebase(),
  enableCrashReporting: !kDebugMode,
);

GhostLogger.log()

Logs a message with optional metadata.

Parameters:

• message (required): The log content
• level: Log severity (default: LogLevel.debug)
• tag: Optional identifier for the log source
• stackTrace: Optional stack trace for context
• reportToCrashService: Override crash reporting for this log (optional)

await GhostLogger.log(
  message: 'Something happened',
  level: LogLevel.info,
  tag: 'MyClass',
  stackTrace: StackTrace.current,
);

Best Practices

1. Configure Once: Set up Ghost Logger in your main() function, before running the app

2. Use Tags: Add meaningful tags to identify log sources

GhostLogger.log(message: 'Data loaded', tag: 'DataService');

3. Appropriate Levels: Use the correct log level for better filtering

LogLevel.debug     // Development only
LogLevel.info      // User actions, flow
LogLevel.warning   // Potential issues
LogLevel.error     // Failures and exceptions

4. Include Stack Traces: Always include stack traces for errors

GhostLogger.log(
  message: 'Operation failed',
  level: LogLevel.error,
  stackTrace: StackTrace.current,
);

5. Production Configuration: Disable debug output in production

await GhostLogger.configure(
  isDebugMode: kDebugMode,
  loggerType: LoggerType.console,
  crashReporter: GhostFirebase(),
  enableCrashReporting: kReleaseMode,
);

Examples

See the example directory for a complete Flutter app demonstrating Ghost Logger usage.

Run the example:

cd example
flutter run

Platform Support

Ghost Logger works on all platforms:

• ✅ Android
• ✅ iOS
• ✅ Web
• ✅ macOS
• ✅ Windows
• ✅ Linux

Contributing

Contributions are welcome! Please feel free to submit pull requests or open issues on GitHub.

License

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

Support

For issues, questions, or suggestions, please open an issue on GitHub.

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Ghost Logger - Stealing errors before they steal your users' experience. 👻