felangel / data_class

Experimental support for data classes in Dart using macros.

data_class

🚧 Experimental support for data classes in Dart using macros.

✨ Features

🪨 const constructors with required, named parameters

🖨️ copyWith with optional, nullable, named parameters

✨ toString for an improved string representation

☯️ operator== and hashCode for value equality

🧑‍💻 Example

import 'package:data_class/data_class.dart';

@Data()
class Person {
  final String name;
}

void main() {
  // 🪨 Create a const instance with required, name parameters.
  const dash = Person(name: 'Dash');

  // 🖨️ Create copies of your object.
  final sparky = dash.copyWith(name: 'Sparky');

  // ✨ Human-readable string representation.
  print(dash); // Person(name: Dash)
  print(sparky); // Person(name: Sparky)

  // ☯️ Value equality comparisons.
  print(dash == dash.copyWith()); // true
  print(dash == sparky); // false
}

🚀 Quick Start

1. Switch to the Flutter master channel flutter channel master

2. Add package:data_class to your pubspec.yaml

   dependencies:
     data_class: any

3. Enable experimental macros in analysis_options.yaml

   analyzer:
     enable-experiment:
       - macros

4. Use the @Data annotation (see above example).

5. Run it

   dart --enable-experiment=macros run main.dart

*Requires Dart SDK >= 3.5.0-152.0.dev