flutter-error-handling-either

What problem does it solve?

Standardize functional error handling in Flutter repositories by returning typed failures instead of uncaught exceptions, enabling safer UI and cleaner state management.

Core Features & Use Cases

• Define domain-specific failures using @freezed unions (e.g., UnauthorizedFailure, ApiFailure) and map infrastructure errors to Left(Failure).
• Enforce using Either<Failure, T> across Repository -> Data Source boundaries and consume results with fold in BLoC or similar.
• Use consistent failure messages and strict layer separation to avoid UI leaks and improve testability.

Quick Start

Use a repository method that returns Either<Failure, T> and handle outcomes with fold in the UI layer.