Convert map object to yaml in Dart

main.dart

void main() {
  final json = {
    'name': 'package_name',
    'version': '1.0.0',
    'dependencies': {
      'dep1': '^1.0.0',
      'dep2': '^1.5.0',
      'dep3': {
        'git': 'https://github.com/graphicbeacon',
        'home': {
          'work': 'play'
        }
      }
    },
    'dev_dependencies': {
      'dep1': '2.0.0',
      'dep3': {
        'git': 'https://github.com/graphicbeacon',
        'home': {
          'work': 'play'
        }
      }
    }
  };
  
  final buffer = StringBuffer();
  final entriesList = json.entries.toList();
  
  mapToYaml(buffer, entriesList, 0);
  
  print(buffer.toString());
}

mapToYaml(StringBuffer buffer, List<MapEntry> entries, int spacing) {
  for (final entry in entries) {
    final spaces = ' ' * spacing;
    
    if (entry.value is String) {
      buffer.writeln('$spaces${entry.key}: ${entry.value}');
    } else if (entry.value is Map) {
      buffer.writeln('$spaces${entry.key}:');
      
      // Recursive
      mapToYaml(buffer, entry.value.entries.toList(), spacing + 2);
    }
  }
}

Run on DartPad https://dartpad.dev/4d39701935b200d88d32193e7c453be7