freezed-patterns

Freezed models immutable state in Flutter by generating sealed classes, union types, and consistent equality, reducing boilerplate for view states and domain entities. It enables predictable pattern matching during UI and business logic flows.

Freezed handles sealed classes in Dart 3 by generating union types that enforce exhaustive pattern matching. This ensures all possible view states or events are covered during switch statements, preventing missing cases.

Freezed works with json_serializable and build_runner to generate JSON serialization logic alongside immutable data classes. Running build_runner produces the code required for safe data parsing and copyWith functionality.

You should not use freezed for simple DTOs or entities to avoid over-abstracting. It is best reserved for complex domain unions and view states where exhaustive pattern matching and strict immutability are required.

Freezed manages state copies and equality by generating copyWith methods and overriding equality operators. This allows you to safely replace data objects while maintaining consistent equality checks across your domain entities.