usecase_interface

A simple library that introduces a UseCase interface for clean architecture patterns.

Features

• UseCase<Input, Output> — for asynchronous use cases
• UseCaseSync<Input, Output> — for synchronous use cases
• Minimal API with no dependencies

Installation

dependencies:
  usecase_interface: ^1.0.0

Usage

Async UseCase with input

import 'package:usecase_interface/usecase_interface.dart';

class GetUser implements UseCase<GetUserParams, Result<User, Exception>> {
  @override
  Future<Result<User, Exception>> call(GetUserParams input) async {
    // Implementation
  }
}

// Usage (callable syntax)
final result = await getUser(GetUserParams(id: '123'));

Async UseCase without input

class GetCurrentUser implements UseCase<void, Result<User, Exception>> {
  @override
  Future<Result<User, Exception>> call(void input) async {
    // Implementation
  }
}

// Usage (pass null for void input)
final result = await getCurrentUser(null);

Sync UseCase

class ValidateEmail implements UseCaseSync<String, Result<bool, Exception>> {
  @override
  Result<bool, Exception> call(String input) {
    // Implementation
  }
}

// Usage (callable syntax)
final result = validateEmail('test@example.com');

Recommended: Use Result type

It is recommended to use a Result type (e.g. from result_dart package) as the Output to handle success and failure cases explicitly.