avoid-anecdotal-types

Spec-based TypeScript typing prevents runtime failures by basing type definitions on official API specifications and schemas. This approach enforces runtime validation and defensive typing to ensure fields, nullability, and optionality reflect real behavior.

Spec-based typing in TypeScript handles optional fields, nullability, and variant shapes by relying on official docs, schemas, and specs. It encourages runtime validation and defensive typing to prevent surprising runtime failures across APIs and services.

Yes, you need runtime validation for spec-aligned TypeScript types to ensure fields, nullability, and optionality reflect real behavior. Defensive typing and runtime validation prevent surprising runtime failures when dealing with API data models.

Spec-based typing works for schema evolution across services by enforcing type definitions based on official specifications and generated types. This prevents type drift and ensures long-term correctness during API and data model changes.