Logging mixin for Dart and Flutter projects

logging.dart

import 'dart:convert';

import 'package:logger/logger.dart';
import 'package:meta/meta.dart';

mixin Logging {
  Logger _logger;

  Logger get log {
    return _logger ??= Logger(
      printer: SimpleLogPrinter(scope: '$runtimeType', colorsEnabled: false),
    );
  }
}

class SimpleLogPrinter extends LogPrinter {
  final String scope;
  final bool colorsEnabled;

  SimpleLogPrinter({
    @required this.scope,
    this.colorsEnabled = false,
  });

  @override
  List<String> log(LogEvent event) {
    final logColor = PrettyPrinter.levelColors[event.level];
    final emoji = PrettyPrinter.levelEmojis[event.level];
    final message = event.message;
    final splitter = LineSplitter();
    final splitMessage = splitter.convert('$message');
    splitMessage[0] = '$emoji $scope - ${splitMessage[0]}';
    if (colorsEnabled) {
      return splitMessage.map((line) => logColor(line)).toList();
    }

    return splitMessage;
  }
}

Note this depents on the logger package

What if i want to log inside of widget that is marked by @immutable? Unfortunately it will always report warning.

f i want to log inside of widget that is marked by @immutable? Unfortunately it will always report warning.

Yeah you're totally right. Haven't found a workaround, besides creating a local instance for the stateless widget.

Logger _logger = Logger();

that way you no longer get the warning in the stateful widget