type-design-analyzer

To enforce invariants in TypeScript domain models, you can analyze type definitions using discriminated unions, branded types, and readonly modifiers to make invalid states unrepresentable and prevent impossible field combinations.

Invalid states become unrepresentable in TypeScript by applying structural design patterns like discriminated unions, opaque types, and wrapper types to type aliases and interfaces, ensuring the type system strictly enforces business rules and constraints.

You can review TypeScript interfaces for weak type constraints by evaluating invariant expression, encapsulation, and enforcement on a 1–10 scale, then applying concrete recommendations like branded types or readonly modifiers to strengthen the data model.

Yes, you can use static analysis to find hidden assumptions in API contracts by reviewing type definitions, enums, and classes to identify exclusivity rules, allowed value ranges, and required field relationships that are weakly enforced.

You should use discriminated unions over type aliases in TypeScript when you need to enforce structural requirements and exclusivity rules between fields, ensuring that only valid combinations of data can be represented in the domain model.

Static type analysis for complex domain modeling requires explicit identification of constraints and cannot automatically infer unwritten business rules, meaning developers must manually define invariants and structural requirements for the analysis to be effective.