effect-domain-modeling

Effect domain modeling uses Schema.TaggedStruct to define discriminated union variants, Schema.decodeSync to generate type-safe constructors that reject invalid runtime input, and Schema.is to provide type guards. This ensures your domain entities are validated at runtime while remaining fully type-safe.

Exhaustive pattern matching for tagged unions in Effect is handled using Match.typeTags. By defining your variants with Schema.TaggedStruct, you can safely branch on each `_tag` value, ensuring all possible domain entity states are covered without falling back to fragile ad-hoc switch statements.

Consistent equality and ordering across Effect Schema variants is enforced by preferring deep structural equality via Equal.equals. When specific semantics are required, you can add field-based Equivalence to maintain consistent ordering and equality checks across your domain model versions.

Recursive schemas and branded types are fully supported in Effect domain modeling. You can use Schema.suspend to define recursive data structures and Brand.make to apply branded validation constraints, allowing you to model complex ADTs and enforce strict runtime safety rules.

Effect domain modeling enforces documentation consistency by requiring JSDoc annotations. Domain modules should include @category, @since, and runnable @example imports using namespace import style to ensure your tagged variants, constructors, and guards are consistently documented and maintainable.

Runtime validation for discriminated unions prevents loosely typed objects and fragile data handling. By generating Schema.decodeSync constructors and Schema.is guards, you reject invalid input at runtime, overcoming the limitations of ad-hoc validation and ensuring type safety throughout your domain logic.