Simple App Logger Singleton

app_logger.dart

import 'package:logger/logger.dart';

class TimestampPrinter extends LogPrinter {
  final LogPrinter _realPrinter;
  
  TimestampPrinter(this._realPrinter);
  
  @override
  List<String> log(LogEvent event) {
    final timestamp = DateTime.now().millisecondsSinceEpoch;
    final realLogs = _realPrinter.log(event);
    return realLogs.map((line) => '[$timestamp] $line').toList();
  }
}

/// A simple, lazily-instantiated singleton that wraps `package:logger`.
class AppLogger {
  // 1) Private constructor
  AppLogger._internal() {
    _logger = Logger(
      printer: TimestampPrinter(PrettyPrinter(
        methodCount: 2,
        excludePaths: ['package:flutter_pro_new/utils/app_logger.dart'],
      )),
    );
  }

  // 2) The single static instance
  static final AppLogger _instance = AppLogger._internal();

  // 3) Factory constructor that always returns the same instance
  factory AppLogger() => _instance;

  // 4) Underlying Logger (late-initialised in the private ctor)
  late final Logger _logger;

  void debug(String message) {
    _logger.d(message);
  }

  void error(String message) {
    _logger.e(message);
  }

  void warning(String message) {
    _logger.w(message);
  }

  /// Access to the wrapped `Logger` in case you need extra features
  Logger get raw => _logger;
}

final appLogger = AppLogger();