Flutter IntelliJ File Templates

Dart Class

class ${ClassName} {
  ${ClassName}();
}

Flutter Model

import 'package:json_annotation/json_annotation.dart';

part '${NAME}.g.dart';

@JsonSerializable()
class ${ClassName} {
  ${ClassName}();

  factory ${ClassName}.fromJson(Map<String, dynamic> json) => 
        _$${ClassName}FromJson(json);
  Map<String, dynamic> toJson() => _$${ClassName}ToJson(this);
}