Logger with no character limit for Dart/Flutter, splits the line into multiple ones when it is too long

multiline_logger.dart

import 'package:logger/logger.dart';

class SplitConsoleOutput extends LogOutput {
  /// Maximum length per line in the log. Any logs larger than this length
  /// will be split into chunks and printed in sequence.
  final int splitLength;

  /// Set to `false` to disable splitting, or leave `null`/`true` to retain the
  /// default behavior, which is to truncate the text.
  /// 
  /// The default is true, so you only need to set it if you prefer to use a
  /// condition to determine whether to split or not per your build 
  /// configuration.
  final bool enable;
  
  /// Usage:
  ///
  /// ```dart
  /// final logger = Logger(
  ///   output: SplitConsoleOutput(splitLength: 1000, enable: true),
  /// )
  /// ```
  SplitConsoleOutput({
    this.splitLength = 1000,
    this.enable = true,
  });

  @override
  void output(OutputEvent event) {
    if (enable && event.lines.any(_isTooLong)) {
      event.lines.forEach((line) {
        if (_isTooLong(line)) {
          final split = splitByLength(line, splitLength);
          split.forEach(print);
        } else {
          print(line);
        }
      });
    } else {
      event.lines.forEach(print);
    }
  }
  
  List<String> splitByLength(String string, int length) {
    final chunks = <String>[];
    final _length = string.length;

    for (var i = 0; i < _length; i += length) {
      final end = (i + length < _length) ? i + length : _length;
      chunks.add(string.substring(i, end));
    }

    return chunks;
  }

  bool _isTooLong(String line) => line.length > splitLength;
}

final logger = Logger(
  output: SplitConsoleOutput(),
);